JP2010035603A - Component for artificial hip joint and unit for artificial hip joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily replace a bone head ball member in revision total hip arthroplasty. <P>SOLUTION: The component 11 for an artificial hip joint is used in the artificial hip joint and is disposed between the bone head ball member 12 and the end part 13a of a stem member 13. A sleeve-like body part 14 is fitted to a fitting hole 12a formed on the bone head ball member 12, and also an insertion hole 18 into which the end part 13a of the stem member 13 is to be inserted is formed. A contact regulation part 16 performs regulation so as to block the contact of at least a part of an inner periphery sectioning the insertion hole 18 in the body part 14 and the outer periphery of the end part 13a of the stem member 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is used in an artificial hip joint, and is disposed on the acetabular side of the femur and formed into a ball shape, and the other end of a stem member formed in a rod shape with one end implanted in the femur. The present invention relates to an artificial hip joint component disposed between the side hip and a hip prosthesis unit including the artificial hip joint component.

  2. Description of the Related Art Conventionally, an operation in which an artificial hip joint is applied is performed on a patient who has an abnormality in a sliding portion of a femur in a hip joint due to a disease such as osteoarthritis or rheumatoid arthritis. As such an operation, a ceramic head ball member formed on the acetabular side of the femur and formed in a ball shape, and a metal stem member formed in a rod shape in which one end side is implanted in the femur Hip arthroplasty (THA: Total Hip Arthroplasty) has been performed in which a hip joint is replaced with an artificial hip joint. In the case of the ceramic head ball member, since the friction coefficient is small, there is an advantage that the member on the acetabular side is hardly worn.

  The hip head ball member may be damaged after artificial hip joint replacement is performed by replacing the hip joint composed of the stem member and the ceramic head ball member fitted to the end of the stem member. . In such a case, hip replacement is performed to replace the damaged member. If the head ball member is damaged, the stem member is likely to be damaged, and if it is replaced with a ceramic head ball member, local stress concentration may occur at the damaged portion of the stem member, which may be damaged again. Increases nature. For this reason, when exchanging with a bone head ball member made of ceramics, even if the degree of damage to the stem member is minor, the necessity to replace the stem member is increased, which increases the labor and burden of surgery. Will be invited. Furthermore, in addition to the effect of scratches on the stem member, even if a minute remaining material such as a broken piece generated when the head ball member is damaged adheres to the stem member, the remaining material remains on the replaced ceramic head ball member. There is a high possibility that local stress concentration occurs due to the material and the bone head ball member is damaged again. When performing hip replacement without replacing the stem member, a metal bone head is used instead of a ceramic bone head ball member that is easily damaged due to stress concentration at the wound portion of the stem member. Many ball members are used. However, when a metal head ball member is used, there is a problem that when a ceramic piece remains, a phenomenon called metallosis in which the metal head ball member is worn out easily occurs. If metallosis occurs, ultimately, a total hip replacement is required.

  On the other hand, from the viewpoint of suppressing local stress concentration and breakage of the ceramic head ball member between the stem member and the stem member, in artificial hip joint replacement, an artificial hip joint between the stem member and the head ball member is used. It is known to use an artificial hip joint in which a sleeve member is disposed as a component for use (see Patent Documents 1 and 2). In Patent Document 1 and Patent Document 2, a sleeve is formed in which a hole is inserted so that the end of the stem member is in sliding contact with the conical curved hole formed in the head ball member. A member is disclosed.

Japanese Laid-Open Patent Publication No. 2-13452 US Pat. No. 5,362,311

  In artificial hip joint replacement, it is conceivable to use a sleeve member disclosed in Patent Document 1 or Patent Document 2 and replace the stem member with a ceramic bone head ball member without replacing the stem member. However, if the end of the stem member is damaged due to damage to the head ball member, or if a minute remaining material such as a broken piece adheres to the stem member, it will slide against the hole of the sleeve member. It becomes difficult to insert the end of the stem member, and the sleeve member cannot be properly attached to the stem member. For this reason, it becomes difficult to replace the head ball member using the sleeve member without replacing the stem member in the total hip replacement. When an artificial hip joint having the above-mentioned sleeve member is applied in the original hip replacement, the hip replacement may be caused due to the occurrence of scratches due to the damage of the ceramic head ball member and the attachment of the remaining material. At the time of replacement, it is necessary to replace the sleeve member. If the stem member is damaged or a minute residual material is attached due to damage to the head ball member, the end of the stem member is slid into the hole of the sleeve member and inserted. The sleeve member cannot be properly attached to the stem member. For this reason, it becomes difficult to replace the head ball member together with the sleeve member without replacing the stem member.

  In view of the above circumstances, the present invention provides a component for an artificial hip joint that enables easy replacement of a head ball member in an artificial hip joint replacement, and an artificial hip joint including the component for an artificial hip joint The purpose is to provide a unit.

  A component for an artificial hip joint according to the first invention for achieving the above object is used in an artificial hip joint, and is arranged on the acetabular side of the femur and formed into a ball shape, and one end side of the femur has one end side. The present invention relates to a component for an artificial hip joint disposed between the stem member formed in the shape of a rod to be implanted and an end portion on the other end side. And the component for artificial hip joints which concerns on 1st invention was fitted in the hole for fitting formed in the said head bone member, and the insertion hole in which the edge part of the other end side of the said stem member was inserted was formed A sleeve-shaped main body, and a contact restricting portion for restricting contact between at least a part of an inner periphery defining the insertion hole in the main body and an outer periphery of an end on the other end side of the stem member; It is characterized by providing.

  According to the present invention, when performing artificial hip joint replacement by damaging the ceramic head ball member, the surgeon inserts the hip component having a sleeve-like body into the insertion hole of the other end of the stem member. It can arrange | position so that the edge part of a side may be inserted, and it may arrange | position so that a new ceramic head head ball member may be fitted to the component for artificial hip joints. At this time, since the contact between the inner periphery of the main body and the outer periphery of the end of the stem member is blocked by the contact restricting portion, interference between the inner periphery of the main body and the outer periphery of the end of the stem member is prevented. It will be. For this reason, even if the end of the stem member is damaged or a minute remaining material such as a broken piece adheres due to the damage to the ball head ball member, the damaged portion or the remaining material and the inside of the main body The interference with the circumference prevents the hip component from being affected when it is attached to the end of the stem member. This makes it easy for the surgeon to properly attach the hip prosthesis component to the stem member whose one end is implanted in the femur without replacing the stem member during the hip replacement surgery. It can be carried out. Then, a new ceramic head ball member can be easily attached to the artificial hip joint component attached to the stem member.

  Therefore, according to the present invention, it is possible to provide a component for an artificial hip joint that makes it possible to easily replace a head ball member in an artificial hip joint replacement.

  A component for a hip prosthesis according to a second aspect of the invention is a component for a hip prosthesis of the first aspect, provided so as to protrude toward the inside of the main body, and abutting against the end on the other end side of the stem member. And a support portion for supporting the main body portion with respect to the stem member.

  According to this invention, the support portion that supports the main body portion with respect to the stem member is provided so as to protrude into the main body portion and come into contact with the end portion of the stem member. For this reason, it is suppressed that the area | region where interference with the inner periphery of a main-body part and the outer periphery of the edge part of a stem member is prevented is occupied by a support part. Thereby, it is suppressed by providing a support part that the function of the area | region where said interference is prevented is impaired. Therefore, the main body can be stably supported with respect to the stem member in a state where interference between the inner periphery of the main body and the outer periphery of the end of the stem member is prevented.

  The component for an artificial hip joint according to a third aspect of the present invention is the component for an artificial hip joint according to the second aspect, wherein the contact restricting portion is provided as the support portion.

  According to this invention, since the contact restricting portion is provided also as the function of the support portion, compared with the case where the contact restricting portion and the support portion are provided separately, the functions of the contact restricting portion and the support portion are fewer components. It can be realized efficiently.

  A component for an artificial hip joint according to a fourth invention is the component for an artificial hip joint according to the second invention or the third invention, wherein the support portion is provided along the circumferential direction of an edge portion that defines an opening of the insertion hole in the main body portion. An opening edge support portion is provided that extends and projects inward so as to contact the stem member.

  According to this invention, since the support portion is provided along the circumferential direction of the edge portion of the opening of the insertion hole, the region where interference between the inner periphery of the main body portion and the outer periphery of the end portion of the stem member is prevented is supported. Occupancy by the part is prevented. For this reason, the function of the area | region where said interference is prevented by providing a support part is not impaired. Further, since the opening edge support portion is supported at the edge portion of the opening of the insertion hole, the main body portion can be more stably supported with respect to the stem member. Therefore, the main body can be more stably and easily supported on the stem member in a state where interference between the inner periphery of the main body and the outer periphery of the end of the stem member is reliably prevented.

  A component for an artificial hip joint according to a fifth aspect is the component for an artificial hip joint according to any one of the second to fourth aspects, wherein the component is formed integrally with the main body, and is opposite to the opening of the insertion hole in the main body. A lid portion provided so as to close the end portion of the stem member, and the support portion is fitted into a hole formed in the end portion on the other end side of the stem member protruding from the lid portion to the inside of the main body portion. A fitting support portion formed so as to fit is provided.

  According to this invention, since the support portion is provided as a fitting support portion that protrudes from the lid portion and fits into the end portion of the stem member, interference between the inner periphery of the main body portion and the outer periphery of the end portion of the stem member is prevented. This prevents the area to be occupied from being occupied by the support portion. For this reason, the function of the area | region where said interference is prevented by providing a support part is not impaired. Further, since the fitting support portion is fitted to and supported by the end portion of the stem member, the main body portion can be more stably supported with respect to the stem member. Therefore, the main body can be more stably and easily supported on the stem member in a state where interference between the inner periphery of the main body and the outer periphery of the end of the stem member is reliably prevented.

  A component for an artificial hip joint according to a sixth aspect of the present invention is the component for an artificial hip joint according to any one of the second to fifth aspects of the present invention, wherein the support is a circumferential portion on the side opposite to the opening of the insertion hole in the main body. A stem tip support portion is provided that extends along the side and protrudes inward to contact the stem member, and is fitted to the tip of the end portion on the other end side of the stem member.

  According to the present invention, since the support portion is provided as a stem tip support portion that is fitted to the tip of the end portion of the stem member, an area in which interference between the inner periphery of the main body portion and the outer periphery of the end portion of the stem member is prevented. Is prevented from being occupied by the support portion. For this reason, the function of the area | region where said interference is prevented by providing a support part is not impaired. Further, since the stem tip support portion is fitted and supported at the tip of the end portion of the stem member, the main body portion can be more stably supported with respect to the stem member more stably. Therefore, the main body can be more stably and easily supported on the stem member in a state where interference between the inner periphery of the main body and the outer periphery of the end of the stem member is reliably prevented.

  A component for an artificial hip joint according to a seventh aspect of the present invention is the component for an artificial hip joint according to any one of the first to sixth aspects, wherein the contact restricting portion includes an inner periphery of the main body and an end on the other end side of the stem member. The contact between the inner periphery of the main body portion and the outer periphery of the end portion on the other end side of the stem member is regulated so that the outer periphery of the portion faces the space.

  According to the present invention, the contact restricting portion forms a space between the inner periphery of the main body portion and the outer periphery of the end portion of the stem member, so that the inner periphery of the main body portion and the outer periphery of the end portion of the stem member are Can be reliably prevented.

  The component for an artificial hip joint according to an eighth aspect of the present invention is the component for an artificial hip joint according to any one of the first to sixth aspects of the invention, wherein the contact restricting portion causes the inner periphery of the main body and the other end of the stem member to end. A region in which contact with the outer periphery of the bone is prevented is filled with bone cement.

  According to this invention, since the bone cement is filled in the region where the contact restricting portion prevents the interference between the inner periphery of the main body portion and the outer periphery of the end portion of the stem member, the combined state of the main body portion and the stem member is further improved. Can be stabilized.

  As another aspect of the invention for achieving the above object, an artificial hip joint unit including any of the above-described artificial hip joint components can be configured. That is, an artificial hip joint unit according to a ninth aspect of the present invention is the artificial hip joint component according to any one of the first to eighth aspects of the invention, and a femoral head ball member formed on the acetabular side of the femur and formed into a ball shape, And at least one of stem members formed in a rod shape in which one end side is implanted in the femur.

  According to the present invention, a hip prosthesis unit comprising: a hip prosthesis component that enables easy replacement of the head ball member in hip replacement, and at least one of the head ball member and the stem member. Can be configured. For this reason, if it is an artificial hip joint unit composed of a bone head ball member and an artificial hip joint component, the hip replacement unit can be easily replaced by replacing the artificial hip joint unit. In addition, in the case of an artificial hip joint unit including a stem member, the artificial hip joint re-replacement is required by applying this artificial hip joint unit during the initial hip replacement. Cases can be easily handled.

  According to the present invention, it is possible to provide a component for an artificial hip joint that enables easy replacement of the head ball member in an artificial hip joint replacement, and to provide an artificial hip joint unit including the component for an artificial hip joint. Can be provided.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is used in a hip prosthesis and includes a head ball member formed on the acetabular side of the femur and formed in a ball shape, and a stem member formed in a rod shape in which one end side is implanted in the femur. The present invention can be widely applied as an artificial hip joint component disposed between the other end and an artificial hip joint unit including the artificial hip joint component.

(First embodiment)
FIG. 1 is a cross-sectional view showing a hip prosthesis unit 1 according to a first embodiment of the present invention, and shows a part of a cross section of a femur 100 and a pelvis 101. The artificial hip joint unit 1 includes a sleeve member 11, a bone head ball member 12, and a stem member 13. FIG. 1 shows a state where the artificial hip joint unit 1 in a state where the sleeve member 11, the head ball member 12, and the stem member 13 are combined is applied as an artificial hip joint. FIG. 1 illustrates a case where the artificial hip joint unit 1 is applied to an artificial hip joint by artificial hip joint replacement. Further, as will be described later, the sleeve member 11 constitutes a component for an artificial hip joint according to the first embodiment of the present invention. When the bone head ball member 12 is damaged, an artificial hip joint replacement is performed, the stem member 13 and the acetabular cup 102 described later are preserved, and the sleeve member 11 and the bone head ball member 12 are replaced with new ones. Will be replaced.

  FIG. 2 is an enlarged cross-sectional view showing a part of the sleeve member 11, the head ball member 12, and the stem member 13 in the artificial hip joint unit 1 (note that the stem member 13 shows a partial cross-section). ). As shown in FIGS. 1 and 2, the femoral head ball member 12 is formed in a ball shape whose outer shape forms a spherical portion, and is disposed on the acetabulum 101 a side of the pelvis 101 in the femur 100. The head ball member 12 is arranged on the acetabulum 101a, and slides on the spherical surface portion of the outer shape with respect to the acetabular cup 102 having a two-layer structure including the outer hemispherical shell member 102a and the inner hemispherical shell member 102b. Are arranged as follows. Further, the bone head ball member 12 is provided with a fitting hole 12a which is formed to open toward one side and into which the sleeve member 11 is fitted. The fitting hole 12a is formed so as to form a part of a conical curved surface that is gradually tapered from the opening side toward the back side. The bone head ball member 12 is made of a ceramic material.

  The stem member 13 shown in FIGS. 1 and 2 is formed in a rod shape, and one end side thereof is implanted in the medullary cavity portion 100 a of the femur 100. A sleeve member 11, which will be described later, is attached to the end portion 13 a on the other end side of the stem member 13. The end portion 13a is formed with a support hole 13b for supporting the sleeve member 11 to be attached. The stem member 13 is made of a metal such as a titanium alloy, a cobalt chromium alloy, or stainless steel that has been approved for medical use as a medical device.

  FIG. 3 is a cross-sectional view of the sleeve member 11. The sleeve member 11 shown in FIGS. 1 to 3 is used in an artificial hip joint, and constitutes a component for an artificial hip joint that is disposed between the head ball member 12 and the end portion 13a on the other end side of the stem member 13. . Therefore, the sleeve member 11 can be applied not only as a constituent member of the artificial hip joint unit 1 but also as a component for an artificial hip joint alone in an artificial hip joint replacement. The sleeve member 11 is made of a metal such as titanium alloy, cobalt chrome alloy, stainless steel, or the like that has been approved as a medical device for living body implantation.

  As shown well in FIGS. 2 and 3, the sleeve member 11 includes a main body portion 14, a lid portion 15, an opening edge support portion 16, and a fitting support portion 17. The main body portion 14 is provided as a conical cylinder-shaped portion in the sleeve member 11 that forms a part of a conical curved surface whose outer periphery gently sags. And this main-body part 14 is comprised so that it may slidably contact in the hole 12a for fitting formed as the taper-shaped hole in the head ball member 12, and the outer peripheral part may fit. The main body 14 is formed with an insertion hole 18 into which the end 13a on the other end side of the stem member 13 is inserted.

  The lid portion 15 of the sleeve member 11 is formed integrally with the main body portion 14 and is provided as a lid-like portion that closes the end portion of the main body portion 14 opposite to the opening of the insertion hole 18. That is, the lid portion 15 constitutes the bottom portion of the insertion hole 18. The lid portion 15 is formed with a plurality of air passage holes 20 for allowing the passage of air. When the sleeve member 11 is fitted in the fitting hole 12 a of the head ball member 12 by sliding contact with the outer peripheral portion of the main body portion 14, air between the sleeve member 11 and the head ball member 12 is provided in the lid portion 15. Thus, the sleeve member 11 and the head ball member 12 are precisely fitted to each other through the air passage hole 20.

  The opening edge support portion 16 and the fitting support portion 17 that are well shown in FIGS. 2 and 3 are provided so as to protrude toward the inside of the main body portion 14, and come into contact with the end portion 13 a of the stem member 13. The portion 11 is provided as a support portion of the present embodiment that supports the stem member 13.

  The opening edge support portion 16 is formed so as to extend along the circumferential direction of the edge portion defining the opening of the insertion hole 18 in the main body portion 14 and to protrude inward to contact the periphery of the end portion 13 a of the stem member 13. Yes. The portion of the opening edge support portion 16 that comes into contact with the stem member 13 is formed so as to form a part of a conical curved surface that gently narrows from the opening side of the insertion hole 18 toward the back side. Thereby, the opening edge support part 16 is reliably in a state in which a load due to the wedge effect is generated on the outer periphery of the end part 13a of the stem member 13 that gently narrows in a tapered shape so as to form a part of a conical curved surface. It is comprised so that it may fit.

  The opening edge support portion 16 protrudes from the edge portion of the opening of the insertion hole 18 and abuts on the end portion 13a of the stem member 13. The contact restricting portion of the present embodiment that restricts contact between the periphery and the outer periphery of the end portion 13 a of the stem member 13 is configured. That is, in the present embodiment, the contact restricting portion is provided as the opening edge support portion 16 and also serves as a support portion. And the opening edge support part 16 which is a contact control part is the inner periphery of the main-body part 14, and a stem member so that the inner periphery of the main-body part 14 and the outer periphery of the edge part 13a of the stem member 13 may oppose across a space. 13 is restricted from contacting the outer periphery of the end portion 13a. Thus, in the present embodiment, as the space region between the inner periphery of the main body portion 14 and the outer periphery of the end portion 13a of the stem member 13, the inner periphery of the main body portion 14 and the outer periphery of the end portion 13a of the stem member 13 are An interference prevention region 19 is formed in which the interference is prevented (see FIG. 2).

  The fitting support portion 17 is formed so as to protrude from the lid portion 15 to the inside of the main body portion 14 and fit into a support hole 13 b formed in the end portion 13 a of the stem member 13. The outer periphery of the fitting support portion 17 is formed in a taper shape that forms a part of a conical curved surface that gently swells in a direction protruding from the lid portion 15. Similarly, the support hole 13b is formed in a tapered hole shape that forms a part of a conical curved surface that gently squeezes toward the back of the hole. Thereby, the fitting support part 17 is comprised so that it may fit reliably in the state which the load by the wedge effect produced with respect to the support hole 13b. In addition, the fitting support part 17 and the support hole 13b do not necessarily need to be formed in the shape which comprises a part of conical curved surface, and what fits by cylindrical curved surfaces, and what fits by a cylindrical curved surface and a conical curved surface. Various modifications may be made.

  Next, the case where the configuration of the present embodiment is applied to hip replacement and hip replacement will be described. In the hip replacement, as shown in FIG. 1, the acetabular cup 102 is disposed on the acetabulum 101 a of the pelvis 101, and the artificial hip joint unit 1 is disposed on the femur 100. Then, one end side of the stem member 13 is implanted in the medullary cavity portion 100a of the femur 100, and the sleeve member 11 and the head ball member 12 are attached to the end portion 13a on the other end side of the stem member 13. The sleeve member 11 is fitted to the outer periphery of the end portion 13 a of the stem member 13 by the opening edge support portion 16 in a state where the end portion 13 a of the stem member 13 is inserted into the insertion hole 18, and at the fitting support portion 17. The stem member 13 is supported by fitting into the support hole 13b. Further, the bone head ball member 12 is disposed so that the outer spherical surface portion is in sliding contact with the acetabular cup 102 while being fitted to the sleeve member 11 through the fitting hole 12a.

  After the hip replacement as described above, when the head ball member 12 is damaged due to various factors such as aging, the hip replacement is performed. In this case, even if the end portion 13a of the stem member 13 is damaged or a minute remaining material such as a broken piece is attached, the stem member 13 is not replaced and the artificial hip joint is not replaced. The sleeve member 11 and the head ball member 12 as the components for use are replaced with new ones. The new sleeve member 11 is attached to the stem member 13 that has not been replaced so as to be supported by the support portions (16, 17) in the same manner as described above. Then, a new head ball member 12 is attached to the sleeve member 11 by fitting in the same manner as described above.

  According to the sleeve member 11 which is a component for an artificial hip joint as described above, when performing a hip replacement by a breakage of the ceramic head ball member 12, the operator inserts the sleeve member 11 into the insertion hole 18 with a stem. The other end portion 13 a of the member 13 can be inserted so that a new ceramic head ball member 12 can be fitted to the sleeve member 11. At this time, the contact between the inner periphery of the main body portion 14 and the outer periphery of the end portion 13a of the stem member 13 is blocked by the opening edge support portion 16 that is a contact restricting portion. Interference with the outer periphery of the end portion 13a is prevented. For this reason, even if the end portion 13a of the stem member 13 is damaged or a minute residual material such as a damaged piece is attached due to the damage of the head ball member 12, the damaged portion or the residual material and the main body The interference with the inner periphery of the portion 14 is suppressed from being affected when the sleeve member 11 is attached to the end portion 13 a of the stem member 13. Accordingly, the surgeon appropriately attaches the sleeve member 11 to the stem member 13 whose one end is implanted in the femur 100 without exchanging the stem member 13 during the artificial hip joint replacement. It can be done easily. Then, a new bone head ball member 12 made of ceramic can be easily attached to the sleeve member 11 attached to the stem member 13.

  Therefore, according to the present embodiment, it is possible to provide the sleeve member 11 that is a component for an artificial hip joint that enables easy replacement of the head ball member 12 in an artificial hip joint replacement.

  Further, according to the sleeve member 11, the support portions (16, 17) that support the main body portion 14 with respect to the stem member 13 are provided so as to protrude into the main body portion 14 and come into contact with the end portion 13 a of the stem member 13. It has been. For this reason, it is suppressed that the interference prevention area | region 19 where interference with the inner periphery of the main-body part 14 and the outer periphery of the edge part 13a of the stem member 13 is prevented is occupied by a support part (16, 17). Thereby, it is suppressed that the function of the interference prevention area | region 19 is impaired by providing a support part (16, 17). Therefore, the main body 14 can be stably supported with respect to the stem member 13 in a state where interference between the inner periphery of the main body 14 and the outer periphery of the end portion 13 a of the stem member 13 is prevented.

  Further, according to the sleeve member 11, the opening edge support portion 16, which is a contact restricting portion, is provided also as a function of the support portion. Therefore, compared to the case where the contact restricting portion and the support portion are provided separately, the contact restricting portion. And the function of a support part is efficiently realizable with few components.

  Further, according to the sleeve member 11, since the opening edge support portion 16 is provided along the circumferential direction of the edge portion of the opening of the insertion hole 18, the interference prevention region 19 is occupied by the opening edge support portion 16 that is the support portion. Is prevented. For this reason, the function of the interference prevention area | region 19 is not impaired by providing the opening edge support part 16. FIG. Further, since the opening edge support portion 16 is supported at the edge portion of the opening of the insertion hole 18, the main body portion 14 can be more stably supported with respect to the stem member 13. Therefore, the main body 14 can be more stably and easily supported with respect to the stem member 13 in a state where interference between the inner periphery of the main body 14 and the outer periphery of the end 13a of the stem member 13 is reliably prevented. it can.

  Further, according to the sleeve member 11, since the fitting support portion 17 is provided so as to protrude from the lid portion 15 and fit to the end portion 13 a of the stem member 13, the interference prevention region 19 is a fitting portion that is a support portion. Occupancy by the support portion 17 is prevented. For this reason, the function of the interference prevention area | region 19 is not impaired by providing the fitting support part 17. FIG. Moreover, since the fitting support part 17 fits and supports the end part 13a of the stem member 13, the main body part 14 can be more stably supported with respect to the stem member 13 more stably. Therefore, the main body 14 can be more stably and easily supported with respect to the stem member 13 in a state where interference between the inner periphery of the main body 14 and the outer periphery of the end 13a of the stem member 13 is reliably prevented. it can.

  Further, according to the sleeve member 11, the main body has a simple structure in which a space is formed between the inner periphery of the main body portion 14 and the outer periphery of the end portion 13 a of the stem member 13 by the opening edge support portion 16 that is a contact restricting portion. Interference between the inner periphery of the portion 14 and the outer periphery of the end portion 13a of the stem member 13 can be reliably prevented.

  Further, according to the artificial hip joint unit 1 of the present embodiment, when the artificial hip joint unit 1 is applied at the time of the initial artificial hip joint replacement, the artificial hip joint replacement can be performed. It can be easily handled.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 4 is a view including a partial cross section showing the artificial hip joint unit 2 according to the second embodiment of the present invention. The artificial hip joint unit 2 includes a sleeve member 21, a bone head ball member 12, and a stem member 23. In addition, in FIG. 4, about the stem member 23, illustration of the one end side implanted by the femur is abbreviate | omitted and only the other end side is shown in figure. The artificial hip joint unit 2 is used in the same manner as the artificial hip joint unit 1 of the first embodiment, and is applied to an artificial hip joint by artificial hip joint replacement. The sleeve member 21 constitutes a component for an artificial hip joint according to the second embodiment of the present invention. When the bone head ball member 12 is damaged, the hip replacement is performed, the stem member 23 and the acetabular cup (not shown) are preserved, and the sleeve member 21 and the bone head ball member 12 are newly replaced. It will be exchanged for something.

  The bone head ball member 12 shown in FIG. 4 has the same configuration as the bone head ball member 12 of the first embodiment, and the same reference numerals are attached in the drawing including the fitting hole 12a, and description thereof is omitted. Similarly to the stem member 13 of the first embodiment, the stem member 23 is formed in a rod shape with a metal such as a titanium alloy or a cobalt chromium alloy, and one end side (not shown) of the medullary cavity of the femur The sleeve member 21 is attached to the end 23a on the other end side. Unlike the stem member 13 of the first embodiment, no support hole is formed in the end portion 23a of the stem member 23.

  The sleeve member 21 shown in FIG. 4 is used in an artificial hip joint, and constitutes a component for an artificial hip joint that is disposed between the head ball member 12 and the end 23 a on the other end side of the stem member 23. Therefore, the sleeve member 21 can be applied not only as a constituent member of the hip prosthesis unit 2 but also as a component for a hip prosthesis alone in the hip replacement. The sleeve member 21 is formed of a metal such as a titanium alloy or a cobalt chrome alloy, like the sleeve member 11 of the first embodiment.

  The sleeve member 21 includes a main body portion 24, a lid portion 25, an opening edge support portion 26, and a stem tip support portion 27. The main body 24 is provided as a conical cylindrical part of the sleeve member 21 that forms a part of a conical curved surface whose outer periphery gently swells. And this main-body part 24 is comprised so that it may slidably contact in the hole 12a for fitting formed as the taper-shaped hole in the head ball member 12, and the outer peripheral part may fit. The main body 24 is formed with an insertion hole 28 into which the end 23a of the stem member 23 is inserted.

  The lid portion 25 of the sleeve member 21 is formed integrally with the main body portion 24 and is provided as a lid-like portion that closes the end portion of the main body portion 24 opposite to the opening of the insertion hole 28. It constitutes the bottom part. The lid portion 25 is formed with an air passage hole 30 at the center for allowing the passage of air. Similarly to the first embodiment, when the sleeve member 21 is fitted into the fitting hole 12a of the head ball member 12, air is released through the air passage hole 30, and the sleeve member 21, the head ball member 12, The precise fitting is performed.

  FIG. 5 is an enlarged cross-sectional view showing an enlarged portion surrounded by a broken-line circle A in FIG. The opening edge support portion 26 and the stem tip support portion 27 shown in FIGS. 4 and 5 are provided so as to protrude toward the inner side of the main body portion 24, and come into contact with the end portion 23 a of the stem member 23, thereby the main body portion. 21 is provided as a support portion of the present embodiment that supports 21 with respect to the stem member 23.

  The opening edge support portion 26 shown in FIG. 4 extends along the circumferential direction of the edge portion defining the opening of the insertion hole 28 in the main body portion 24 and protrudes inward so as to contact the periphery of the end portion 23 a of the stem member 23. Is formed. A portion of the opening edge support portion 26 that comes into contact with the stem member 23 is formed so as to form a part of a conical curved surface that gently narrows from the opening side of the insertion hole 28 toward the back side. As a result, the opening edge support portion 26 is securely attached to the outer periphery of the end portion 23a of the stem member 23 that is gradually tapered so as to form a part of a conical curved surface in a state where a load due to the wedge effect is generated. It is comprised so that it may fit.

  The stem tip support portion 27 shown in FIGS. 4 and 5 is formed to extend along the circumferential direction on the side opposite to the opening of the insertion hole 28 in the main body portion 24. The stem tip support portion 27 is formed so as to protrude inside the main body portion 24 so as to be fitted to the tip of the end portion 23a of the stem member 23 and to contact the periphery of the tip of the end portion 23a of the stem member 23. ing. The portion of the stem tip support portion 27 that contacts the stem member 23 is formed so as to form a part of a conical curved surface that gently narrows toward the back side of the insertion hole 28, similar to the opening edge support portion 26. ing. Thereby, the stem tip support portion 27 is in a state in which a load due to the wedge effect is generated on the outer periphery of the tip end of the end portion 23a of the stem member 23 that is gradually tapered so as to form a part of a conical curved surface. It is comprised so that it may fit reliably. The tips of the stem tip support portion 27 and the end 23a of the stem member 23 do not necessarily have to be formed in a shape that forms part of a conical curved surface. Various modifications such as a fitting with a curved surface may be performed.

  Further, as described above, the opening edge support portion 26 and the stem tip support portion 27 protrude at the edge portion of the opening of the insertion hole 28 and the opposite side of the edge portion, and come into contact with the end portion 23a of the stem member 23. It has a configuration. Accordingly, the opening edge support portion 26 and the stem tip support portion 27 are regulated so as to prevent contact between the inner periphery defining the insertion hole 28 in the main body portion 24 and the outer periphery of the end portion 23a of the stem member 23. The contact restricting portion of the form is configured. That is, in the second embodiment, the contact restricting portion is provided as the opening edge support portion 26 and the stem tip support portion 27, and also functions as a support portion. The opening edge support portion 26 and the stem tip support portion 27, which are contact restriction portions, are arranged so that the inner periphery of the main body portion 24 and the outer periphery of the end portion 23a of the stem member 23 face each other with a space therebetween. The contact between the inner periphery of the stem member 23 and the outer periphery of the end 23 a of the stem member 23 is restricted. As described above, in the second embodiment, as the space region between the inner periphery of the main body 24 and the outer periphery of the end 23a of the stem member 23, the inner periphery of the main body 24 and the outer periphery of the end 23a of the stem member 23 are used. The interference prevention area | region 29 where interference with is prevented is formed (refer FIG. 4).

  Next, the case where the configuration of the present embodiment is applied to hip replacement and hip replacement will be described. In the hip replacement, as in the first embodiment, one end side of the stem portion 23 is implanted in the medullary cavity of the femur, and the sleeve member 21 and the end portion 23a on the other end side of the stem member 23 are A head ball member 12 is attached. In the state where the end portion 23 a of the stem member 23 is inserted into the insertion hole 28, the sleeve member 21 is formed at the root side and the distal end side of the end portion 23 a of the stem member 23 with the opening edge support portion 26 and the stem tip support portion 27. The stem member 23 is supported by fitting in two places. Further, the bone head ball member 12 is arranged so as to be fitted to the sleeve member 21 through the fitting hole 12a, and the outer spherical surface portion is in sliding contact with the acetabular cup arranged on the acetabular lid.

  After the hip replacement as described above, when the head ball member 12 is damaged due to various factors such as aging, the hip replacement is performed. In this case, similarly to the first embodiment, even if the end 23a of the stem member 23 is damaged or a minute remaining material such as a broken piece is attached, the stem member 23 The sleeve member 21 and the bone head ball member 12 as components for the artificial hip joint are replaced with new ones without being replaced. The new sleeve member 21 is attached to the stem member 23 that has not been replaced so as to be supported by the support portions (26, 27) in the same manner as described above. Then, a new head ball member 12 is attached to the sleeve member 21 by fitting in the same manner as described above.

  In the configuration of the present embodiment, even if the hip prosthesis unit 2 is not applied in the initial hip replacement, the prosthetic hip joint can be regenerated by using the sleeve member 21 as the hip prosthesis component. In the replacement, the head ball member can be easily replaced without replacing the stem member. In the initial hip replacement, a stem member with a bone head ball member directly fitted to the stem member is used. If the head ball member is damaged, scratches or minute residual materials adhere to the end of the stem member. Will occur. In this case, in the artificial hip joint replacement, the operator arranges the sleeve member 21 so that the end of the other end side of the stem member where the wound or the minute remaining material is attached is inserted into the insertion hole 28. The main body 24 of the sleeve member 21 can be supported on the end of the stem member by the support portions (26, 27). At this time, since the interference prevention region 29 is formed by the support portions (26, 27) which are contact restricting portions, it is not affected by scratches generated on the end portion of the stem member or adhesion of minute residual material, The sleeve member 21 can be easily attached to the stem member. Then, the new head ball member 12 can be fitted and attached to the newly attached sleeve member 21. Therefore, the hip replacement unit can be easily performed by using the artificial hip joint unit including the sleeve member 21 and the head ball member 12.

  According to the sleeve member 21 which is a component for an artificial hip joint described above, in the hip replacement, this sleeve member 21 is attached to the end portion 23a of the stem member 23, and a new ceramic bone head ball member 12 is attached to the sleeve member 21. It can be fitted and arranged. At this time, contact between the inner periphery of the main body portion 24 and the outer periphery of the end portion 23a of the stem member 23 is blocked by the opening edge support portion 26 and the stem tip support portion 27 which are contact restriction portions. Interference between the inner periphery and the outer periphery of the end 23a of the stem member 23 is prevented. For this reason, even if the end 23a of the stem member 23 is damaged or a minute remaining material is attached due to the damage to the head ball member 12, the damaged portion or the remaining material and the inside of the main body portion 24 Interference with the circumference prevents the sleeve member 21 from being affected when the sleeve member 21 is attached to the end portion 23a of the stem member 23. Thus, the operator can easily attach the sleeve member 21 properly to the stem member 23 whose one end is implanted in the femur without exchanging the stem member 23 during the hip replacement replacement. Can be done. Then, the new bone head ball member 12 made of ceramics can be easily attached to the sleeve member 21 attached to the stem member 23.

  Therefore, according to the second embodiment, similarly to the first embodiment, the sleeve member 21 that is a component for an artificial hip joint that enables easy replacement of the head ball member 12 in the hip replacement surgery. Can be provided.

  Further, according to the sleeve member 21, the stem tip support portion 27 is provided so as to be fitted to the tip of the end portion 23 a of the stem member 23, so that the interference prevention region 29 is occupied by the stem tip support portion 29. Is prevented. For this reason, the function of the interference prevention area | region 29 is not impaired by providing the stem front-end | tip support part 29. FIG. Further, since the stem tip support portion 29 is fitted and supported at the tip of the end portion 23 a of the stem member 23, the main body portion 24 can be more stably supported with respect to the stem member 23. Therefore, the main body 24 can be more stably and easily supported with respect to the stem member 23 in a state where interference between the inner periphery of the main body 24 and the outer periphery of the end 23a of the stem member 23 is reliably prevented. it can. In the opening edge support portion 26, as in the first embodiment, the main body portion 24 is mounted in a state in which interference between the inner periphery of the main body portion 24 and the outer periphery of the end portion 23a of the stem member 23 is reliably prevented. It is possible to support the stem member 23 more stably and easily.

  Further, according to the sleeve member 21, since the opening edge support portion 16 and the stem tip support portion 27, which are contact restriction portions, are provided also as the function of the support portion, compared with the case where the contact restriction portion and the support portion are provided separately. And the function of a contact control part and a support part is efficiently realizable with few components. The main body has a simple structure in which a space is formed between the inner periphery of the main body 24 and the outer periphery of the end portion 23a of the stem member 23 by the opening edge support portion 26 and the stem tip support portion 27 which are contact restriction portions. Interference between the inner periphery of the portion 24 and the outer periphery of the end portion 23a of the stem member 23 can be reliably prevented.

  Further, according to the hip prosthesis unit 2 of the present embodiment, when the prosthetic hip joint unit 2 is applied at the time of the initial hip replacement, the hip replacement can be performed. It can be easily handled. In addition, even when the hip replacement unit 2 is not applied in the original hip replacement, the hip replacement unit constituted by the sleeve member 21 and the head ball member 12 in the hip replacement replacement. By exchanging, the artificial hip joint replacement can be easily performed without exchanging the stem member.

(Third embodiment)
Next, a third embodiment of the present invention will be described. FIG. 6 is a view including a partial cross section showing the artificial hip joint unit 3 according to the third embodiment of the present invention. The artificial hip joint unit 3 includes a sleeve member 31, a bone head ball member 12, and a stem member 23. In addition, in FIG. 6, about the stem member 23, illustration of the one end side implanted by the femur is abbreviate | omitted and only the other end side is shown in figure. The artificial hip joint unit 3 is used in the same manner as the artificial hip joint unit 1 of the first embodiment, and is applied to an artificial hip joint by artificial hip joint replacement. The sleeve member 31 constitutes a component for an artificial hip joint according to the third embodiment of the present invention. When the bone head ball member 12 is damaged, the hip replacement is performed, the stem member 23 and the acetabular cup (not shown) are preserved, and the sleeve member 31 and the bone head ball member 12 are newly replaced. It will be exchanged for something.

  The head ball member 12 shown in FIG. 6 has the same configuration as that of the head ball member 12 of the first embodiment, and the same reference numerals are used in the drawing including the fitting hole 12a to omit the description. In addition, the stem member 23 has the same configuration as the stem member 23 of the second embodiment, and the same reference numerals are given in the drawing including the end portion 23a on the other end side, and description thereof is omitted.

  The sleeve member 31 shown in FIG. 6 is used in an artificial hip joint, and constitutes a component for an artificial hip joint that is disposed between the head ball member 12 and the end 23 a on the other end side of the stem member 23. Therefore, the sleeve member 31 can be applied not only as a constituent member of the hip prosthesis unit 3 but also as a hip prosthesis component alone in the hip replacement. The sleeve member 31 is made of a metal such as a titanium alloy or a cobalt chrome alloy, like the sleeve member 11 of the first embodiment.

  The sleeve member 31 includes a main body portion 34, a lid portion 35, and an opening edge support portion 36. The main body 34 is provided as a conical cylindrical part of the sleeve member 31 that forms a part of a conical curved surface whose outer periphery gently sags. And this main-body part 34 is comprised so that it may slidably contact in the hole 12a for fitting formed as the taper-shaped hole in the head ball member 12, and the outer peripheral part may fit. The main body 34 is formed with an insertion hole 38 into which the end 23a on the other end side of the stem member 23 is inserted.

  FIG. 7 is a view of only the sleeve member 31 as viewed from the opening side of the insertion hole 38. As shown in FIGS. 6 and 7, the lid portion 35 of the sleeve member 31 is formed integrally with the main body portion 34 and covers the end of the main body portion 34 opposite to the opening of the insertion hole 38. And constitutes the bottom portion of the insertion hole 38. The lid portion 35 is formed with a cement relief hole 40a at the center for allowing passage of bone cement, which will be described later.

  The opening edge support portion 36 shown in FIGS. 6 and 7 is provided so as to protrude toward the inside of the main body portion 34, and comes into contact with the end portion 23 a of the stem member 23, so that the main body portion 31 is attached to the stem member 23. It is provided as a support part of this embodiment which supports it. The opening edge support portion 36 is formed so as to extend along the circumferential direction of the edge portion that defines the opening of the insertion hole 38 in the main body portion 34 and to protrude inward to contact the periphery of the end portion 23 a of the stem member 23. ing. In addition, the opening edge support portions 36 are distributed in a plurality along the circumferential direction of the edge portion of the opening of the insertion hole 38, and bone cement passes between the adjacent opening edge support portions 36. Cement relief grooves 40b for allowing are formed respectively. The portion of the opening edge support portion 36 that contacts the stem member 23 is formed to have a curved surface that widens toward the opening side of the insertion hole 38. As a result, the opening edge support portion 36 is securely attached to the outer periphery of the end portion 23a of the stem member 23, which is gently tapered so as to form a part of a conical curved surface, in a state where a load due to the wedge effect is generated. It is comprised so that it may fit.

  Further, as described above, the opening edge support portion 36 protrudes at the edge portion of the opening of the insertion hole 38 and comes into contact with the end portion 23 a of the stem member 23. As a result, the opening edge support part 36 restricts the contact restricting part of the present embodiment that restricts the contact between the inner periphery defining the insertion hole 38 in the main body part 34 and the outer periphery of the end part 23 a of the stem member 23. It is composed. That is, in the third embodiment, the contact restricting portion is provided as the opening edge support portion 36 and also serves as a support portion. When the artificial hip joint unit 3 is used, contact between the inner periphery of the main body 34 and the outer periphery of the end portion 23a of the stem member 23 is prevented by the opening edge support portion 36 that is a contact restricting portion. The area is filled with bone cement 37. Thus, in the third embodiment, an interference prevention region 39 in which interference between the inner periphery of the main body 34 and the outer periphery of the end portion 23a of the stem member 23 is formed as the region filled with the bone cement 37. (See FIG. 6).

  Next, the case where the configuration of the present embodiment is applied to hip replacement and hip replacement will be described. In the hip replacement, as in the first embodiment, one end side of the stem portion 23 is implanted in the medullary cavity of the femur, and the sleeve member 31 and the end portion 23a on the other end side of the stem member 23 are A head ball member 12 is attached. The sleeve member 31 is fitted to the end portion 23a of the stem member 23 by the opening edge support portion 36 in a state where the end portion 23a of the stem member 23 is inserted into the insertion hole 38, so that Supported. A bone cement 37 is filled in an interference prevention region 39 between the inner periphery of the main body 34 and the outer periphery of the end 23 a of the stem member 23. At this time, a part of the filled bone cement 37 is discharged from the cement escape hole 40a and the plurality of cement escape grooves 40b. Further, the head ball member 12 is arranged so as to be fitted to the sleeve member 31 through the fitting hole 12a, and the spherical portion of the outer shape is slidably contacted with the acetabular cup arranged on the acetabulum.

  After the hip replacement as described above, when the head ball member 12 is damaged due to various factors such as aging, the hip replacement is performed. In this case, similarly to the first embodiment, even if the end 23a of the stem member 23 is damaged or a minute remaining material such as a broken piece is attached, the stem member 23 The sleeve member 31 and the bone head ball member 12 as the artificial hip joint component are replaced with new ones without being replaced. The new sleeve member 31 is attached to the stem member 23 that has not been replaced so as to be supported by the opening edge support portion 36 in the same manner as described above. Then, the new head ball member 12 is attached to the sleeve member 31 by fitting in the same manner as described above. The interference prevention area 39 is also newly filled with bone cement 37.

  In the configuration of the present embodiment, even when the hip prosthesis unit 3 is not applied in the initial hip replacement, the prosthetic hip joint can be regenerated by using the sleeve member 31 as a hip prosthesis component. In the replacement, the head ball member can be easily replaced without replacing the stem member. In the initial hip replacement, a stem member with a bone head ball member directly fitted to the stem member is used. If the head ball member is damaged, scratches or minute residual materials adhere to the end of the stem member. Will occur. In this case, in the hip replacement, the operator arranges the sleeve member 31 so that the end on the other end side of the stem member where the wound or the minute remaining material is attached is inserted into the insertion hole 38. The body portion 34 of the sleeve member 31 can be supported by the end portion of the stem member by the opening edge support portion 36. At this time, since the interference prevention region 39 is formed by the opening edge support portion 36 that is a contact restricting portion, the sleeve member is not affected by scratches generated on the end portion of the stem member or adhesion of minute residual material. 31 can be easily attached to the stem member. Then, the interference prevention region 39 can be filled with bone cement, and the new head ball member 12 can be fitted and attached to the newly attached sleeve member 31. Therefore, the hip replacement unit can be easily performed by using the artificial hip joint unit including the sleeve member 31 and the head ball member 12.

  According to the sleeve member 31 which is a component for an artificial hip joint described above, in the hip replacement, this sleeve member 31 is attached to the end portion 23a of the stem member 23, and a new ceramic bone head ball member 12 is attached to the sleeve member 31. It can be fitted and arranged. At this time, contact between the inner periphery of the main body portion 34 and the outer periphery of the end portion 23a of the stem member 23 is blocked by the opening edge support portion 36 that is a contact restricting portion. Interference with the outer periphery of the end portion 23a is prevented. For this reason, even if the end 23a of the stem member 23 is damaged or a minute residual material is attached due to the damage to the head ball member 12, the damaged portion or the remaining material and the inside of the main body 34 are The interference with the circumference prevents the sleeve member 31 from being affected when the sleeve member 31 is attached to the end portion 23a of the stem member 23. Thus, the operator can easily attach the sleeve member 31 properly to the stem member 23 whose one end is implanted in the femur without exchanging the stem member 23 during the hip replacement. Can be done. Then, the new bone head ball member 12 made of ceramics can be easily attached to the sleeve member 31 attached to the stem member 23.

  Therefore, according to the third embodiment, similarly to the first embodiment, the sleeve member 31 that is a component for an artificial hip joint that enables easy replacement of the head ball member 12 in the hip replacement surgery. Can be provided.

  Further, according to the sleeve member 31, since the opening edge support portion 36 is provided, the interference between the inner periphery of the main body portion 34 and the outer periphery of the end portion 23a of the stem member 23 is ensured as in the first embodiment. In the prevented state, the main body 34 can be more stably and easily supported with respect to the stem member 23. Moreover, since the opening edge support part 36 which is a contact control part is provided also as the function of a support part, compared with the case where a contact control part and a support part are provided separately, the function of a contact control part and a support part is provided. It can be efficiently realized with few components. Further, by filling the bone cement 37 into the interference prevention region 39 formed by the opening edge support portion 36 that is a contact restricting portion, the coupling state of the main body portion 34 and the stem member 23 can be further stabilized.

  In addition, according to the hip prosthesis unit 3 of the present embodiment, when the prosthetic hip joint unit 3 is applied during the initial hip replacement, even when the hip replacement is necessary. It can be easily handled. Further, even if the hip replacement unit 3 is not applied in the original hip replacement, the hip replacement unit configured by the sleeve member 31 and the head ball member 12 in the hip replacement replacement. By exchanging, the artificial hip joint replacement can be easily performed without exchanging the stem member.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. FIG. 8 is a view including a partial cross section showing the artificial hip joint unit 4 according to the fourth embodiment of the present invention. The artificial hip joint unit 4 includes a sleeve member 41, a bone head ball member 12, and a stem member 23. In addition, in FIG. 8, about the stem member 23, illustration of the one end side implanted by the femur is abbreviate | omitted and only the other end side is shown in figure. The artificial hip joint unit 4 is used in the same manner as the artificial hip joint unit 1 of the first embodiment, and is applied to an artificial hip joint by artificial hip joint replacement. Moreover, the sleeve member 31 comprises the component for artificial hip joints which concerns on 4th Embodiment of this invention. When the bone head ball member 12 is damaged, the hip replacement is performed, the stem member 23 and the acetabular cup (not shown) are preserved, and the sleeve member 41 and the bone head ball member 12 are newly replaced. It will be exchanged for something.

  The bone head ball member 12 shown in FIG. 8 has the same configuration as the bone head ball member 12 of the first embodiment, and the same reference numerals are attached in the drawing including the fitting hole 12a, and the description thereof is omitted. In addition, the stem member 23 has the same configuration as the stem member 23 of the second embodiment, and the same reference numerals are given in the drawing including the end portion 23a on the other end side, and description thereof is omitted.

  The sleeve member 41 shown in FIG. 8 is used in an artificial hip joint, and constitutes a component for an artificial hip joint that is disposed between the head ball member 12 and the end 23 a on the other end side of the stem member 23. Therefore, the sleeve member 41 can be applied not only as a constituent member of the artificial hip joint unit 4 but also as a component for an artificial hip joint alone in an artificial hip joint replacement. The sleeve member 41 is made of a metal such as a titanium alloy or a cobalt chrome alloy, like the sleeve member 11 of the first embodiment.

  The sleeve member 41 includes a main body portion 44, a lid portion 45, and an opening edge support portion 46. The main body 44 is provided in the sleeve member 41 as a conical cylindrical portion that forms a part of a conical curved surface whose outer periphery gently sags. And this main-body part 44 is comprised so that it may slidably contact in the hole 12a for fitting formed as a taper-shaped hole in the bone head ball member 12, and the outer peripheral part may fit. The main body 44 is formed with an insertion hole 48 into which the end 23a on the other end side of the stem member 23 is inserted. The lid 45 is formed integrally with the main body 44, and is provided as a lid-like portion that closes the end of the main body 44 opposite to the opening of the insertion hole 48. Is configured. The lid 45 is formed with a cement relief hole 50 at the center for allowing passage of bone cement.

  The opening edge support portion 46 is provided so as to protrude toward the inside of the main body portion 34, and supports the main body portion 41 with respect to the stem member 23 by contacting the end portion 23 a of the stem member 23. It is provided as a support part. The opening edge support portion 46 is formed so as to extend along the circumferential direction of the edge portion that defines the opening of the insertion hole 48 in the main body portion 44 and to protrude inward to contact the periphery of the end portion 23 a of the stem member 23. ing. Further, the portion of the opening edge support portion 46 that comes into contact with the stem member 23 is formed so as to form a part of a conical curved surface that gently narrows from the opening side of the insertion hole 48 toward the back side. As a result, the opening edge support portion 46 is securely attached to the outer periphery of the end portion 23a of the stem member 23 that is gradually tapered so as to form a part of a conical curved surface in a state where a load due to the wedge effect is generated. It is comprised so that it may fit.

  Further, as described above, the opening edge support portion 46 protrudes at the edge portion of the opening of the insertion hole 48 and comes into contact with the end portion 23 a of the stem member 23. As a result, the opening edge support portion 46 controls the contact restricting portion of the present embodiment that restricts the contact between the inner periphery defining the insertion hole 48 in the main body portion 44 and the outer periphery of the end portion 23a of the stem member 23. It is composed. That is, in 4th Embodiment, the contact control part is provided as the opening edge support part 46, and it serves as the function of a support part. When the artificial hip joint unit 4 is used, contact between the inner periphery of the main body portion 44 and the outer periphery of the end portion 23a of the stem member 23 is prevented by the opening edge support portion 46 that is a contact restricting portion. The area is filled with bone cement 47. As described above, in the fourth embodiment, the interference prevention region 49 in which interference between the inner periphery of the main body portion 44 and the outer periphery of the end portion 23a of the stem member 23 is formed as the region filled with the bone cement 47. ing.

  Next, the case where the configuration of the present embodiment is applied to hip replacement and hip replacement will be described. In the hip replacement, as in the first embodiment, one end side of the stem portion 23 is implanted in the medullary cavity portion of the femur, and the sleeve member 41 and the end portion 23a on the other end side of the stem member 23 are provided. A head ball member 12 is attached. The sleeve member 41 is fitted to the end portion 23 a of the stem member 23 by the opening edge support portion 46 in a state where the end portion 23 a of the stem member 23 is inserted into the insertion hole 48, so that Supported. A bone cement 47 is filled in an interference prevention region 49 between the inner periphery of the main body 44 and the outer periphery of the end portion 23a of the stem member 23. At this time, a part of the filled bone cement 47 is discharged from the cement escape hole 50. Further, the head ball member 12 is arranged so as to be fitted to the sleeve member 31 through the fitting hole 12a, and the spherical portion of the outer shape is slidably contacted with the acetabular cup arranged on the acetabulum.

  After the hip replacement as described above, when the head ball member 12 is damaged due to various factors such as aging, the hip replacement is performed. In this case, similarly to the first embodiment, even if the end 23a of the stem member 23 is damaged or a minute remaining material such as a broken piece is attached, the stem member 23 Without replacement, the sleeve member 41 and the head ball member 12 as components for the artificial hip joint are replaced with new ones. The new sleeve member 41 is attached to the stem member 23 that has not been replaced so as to be supported by the opening edge support portion 46 in the same manner as described above. Then, a new head ball member 12 is attached to the sleeve member 41 by fitting in the same manner as described above. The interference prevention area 49 is newly filled with bone cement 47.

  In the configuration of the present embodiment, even if the hip prosthesis unit 4 is not applied in the initial hip replacement, the sleeve part 41 as the hip prosthesis component is used to regenerate the hip prosthesis. In the replacement, the head ball member can be easily replaced without replacing the stem member. In the initial hip replacement, a stem member with a bone head ball member directly fitted to the stem member is used. If the head ball member is damaged, scratches or minute residual materials adhere to the end of the stem member. Will occur. In this case, in the hip replacement surgery, the operator arranges the sleeve member 41 so that the end of the other end side of the stem member where the wound or the minute remaining material is attached is inserted into the insertion hole 48. The body portion 44 of the sleeve member 41 can be supported on the end portion of the stem member by the opening edge support portion 46. At this time, since the interference prevention region 49 is formed by the opening edge support portion 46 which is a contact restricting portion, the sleeve member is not affected by scratches generated on the end portion of the stem member or adhesion of minute residual material. 41 can be easily attached to the stem member. Then, the interference prevention region 49 can be filled with bone cement, and the new head ball member 12 can be fitted and attached to the newly attached sleeve member 41. Therefore, the hip replacement unit can be easily performed by using the artificial hip joint unit including the sleeve member 41 and the head ball member 12.

  According to the sleeve member 41 that is a component for an artificial hip joint described above, in the hip replacement, the sleeve member 41 is attached to the end portion 23a of the stem member 23, and the new ceramic head ball member 12 is attached to the sleeve member 41. It can be fitted and arranged. At this time, contact between the inner periphery of the main body portion 44 and the outer periphery of the end portion 23a of the stem member 23 is blocked by the opening edge support portion 46 that is a contact restricting portion. Interference with the outer periphery of the end portion 23a is prevented. For this reason, even if the end 23a of the stem member 23 is damaged or a minute residual material is adhered due to the damage to the head ball member 12, the damaged portion or the remaining material and the inside of the main body portion 44 The interference with the circumference prevents the sleeve member 41 from being affected when the sleeve member 41 is attached to the end portion 23a of the stem member 23. Thus, the operator can easily attach the sleeve member 41 properly to the stem member 23 whose one end is implanted in the femur without exchanging the stem member 23 during the hip replacement replacement. Can be done. Then, the new bone head ball member 12 made of ceramics can be easily attached to the sleeve member 41 attached to the stem member 23.

  Therefore, according to the fourth embodiment, similarly to the first embodiment, the sleeve member 41, which is a component for an artificial hip joint, can be easily exchanged for the head ball member 12 in the artificial hip joint replacement. Can be provided.

  Further, according to the sleeve member 41, since the opening edge support portion 46 is provided, the interference between the inner periphery of the main body portion 44 and the outer periphery of the end portion 23a of the stem member 23 is ensured as in the first embodiment. In the prevented state, the main body 44 can be more stably and easily supported with respect to the stem member 23. Moreover, since the opening edge support part 46 which is a contact control part is provided also as the function of a support part, compared with the case where a contact control part and a support part are provided separately, the function of a contact control part and a support part is provided. It can be efficiently realized with few components. In addition, by filling the interference prevention region 49 formed by the opening edge support portion 46 which is a contact restricting portion with the bone cement 47, the coupling state of the main body portion 44 and the stem member 23 can be further stabilized.

  Further, according to the artificial hip joint unit 4 of the present embodiment, by applying the artificial hip joint unit 4 at the time of the initial artificial hip joint replacement, it is possible to perform the artificial hip joint replacement. It can be easily handled. Further, even when the hip replacement unit 4 is not applied in the original hip replacement, the hip replacement unit configured by the sleeve member 41 and the head ball member 12 in the hip replacement replacement. By exchanging, the artificial hip joint replacement can be easily performed without exchanging the stem member.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. For example, the contact restricting portion may not necessarily be provided as a support portion, and may be provided as a configuration independent of the support portion. In addition, the contact restricting portion is not necessarily formed integrally with the main body portion or the lid portion, and may be configured as a separate member from the main body portion or the lid portion. Moreover, about arrangement | positioning and a shape of a contact control part and a support part, not only what was illustrated in embodiment but various changes can also be implemented. Further, the cover portion of the sleeve member is not necessarily provided. In the first and second embodiments, the interference prevention area is configured as a space. However, the interference prevention area may be filled with bone cement. In the third and fourth embodiments, the interference prevention region is filled with bone cement. However, the interference prevention region may be configured as a space.

  The present invention is used in an artificial hip joint, and is disposed on the acetabular side of the femur and formed into a ball shape, and the other end of a stem member formed in a rod shape with one end implanted in the femur. The present invention can be widely applied as a component for an artificial hip joint disposed between the end portion on the side and a unit for an artificial hip joint including the component for an artificial hip joint.

It is sectional drawing which shows the unit for artificial hip joints concerning 1st Embodiment of this invention, Comprising: It is the figure shown with a part of cross section of a femur and a pelvis. It is sectional drawing which expands and shows a part of sleeve member in the artificial hip joint unit shown in FIG. 1, a head ball member, and a stem member. It is sectional drawing of the sleeve member in the unit for artificial hip joints shown in FIG. It is sectional drawing which expands and shows a part of the sleeve member in the artificial hip joint unit which concerns on 2nd Embodiment of this invention, a head ball member, and a stem member. FIG. 5 is an enlarged cross-sectional view showing an enlarged portion surrounded by a broken-line circle A in FIG. 4. It is sectional drawing which expands and shows a part of the sleeve member in the artificial hip joint unit which concerns on 3rd Embodiment of this invention, a bone head ball member, and a stem member. It is the figure which looked at only the sleeve member shown in FIG. 6 from the opening side of the insertion hole. It is sectional drawing which expands and shows a part of sleeve member, head ball member, and stem member in the artificial hip joint unit which concerns on 4th Embodiment of this invention.

Explanation of symbols

1 Hip Prosthesis Unit 11 Sleeve Member (Prosthetic Hip Joint Component)
12 bone head ball member 12a fitting hole 13 stem member 13a end 14 on the other end side of the stem member body 16 opening edge support (support, contact restriction)
17 Fitting support part (support part)
18 Insertion hole 100 Femur 101a Acetabulum

Claims (9)

The end part on the other end side of the head member formed in the shape of a ball that is used in the hip prosthesis and disposed on the acetabular side of the femur, and a stem member formed in the shape of a rod in which one end is implanted in the femur An artificial hip joint component disposed between and
A sleeve-like main body portion that is fitted into a fitting hole formed in the bone head ball member and has an insertion hole into which an end portion on the other end side of the stem member is inserted,
A contact restricting portion for restricting contact with at least a part of an inner periphery defining the insertion hole in the main body portion and an outer periphery of an end portion on the other end side of the stem member;
A component for an artificial hip joint, characterized by comprising: The component for an artificial hip joint according to claim 1,
It further includes a support portion that is provided so as to protrude toward the inside of the main body portion and supports the main body portion with respect to the stem member by abutting with an end portion on the other end side of the stem member. A component for artificial hip joints. A component for an artificial hip joint according to claim 2,
The artificial hip joint component, wherein the contact restricting portion is provided as the supporting portion. The artificial hip joint component according to claim 2 or 3,
As the support portion, an opening edge support portion is provided that extends along the circumferential direction of the edge portion that defines the opening of the insertion hole in the main body portion, and that protrudes inward to contact the stem member. A component for artificial hip joints. A component for artificial hip joints according to any one of claims 2 to 4,
A lid portion formed integrally with the body portion and provided to close an end of the body portion opposite to the opening of the insertion hole;
As the support portion, a fitting support portion formed so as to protrude from the lid portion to the inside of the main body portion and fit into a hole formed in the end portion on the other end side of the stem member is provided. A component for artificial hip joints. A component for an artificial hip joint according to any one of claims 2 to 5,
The support portion is formed so as to extend along the circumferential direction on the side opposite to the opening of the insertion hole in the main body portion and to protrude inwardly to contact the stem member, and is an end on the other end side of the stem member A prosthetic hip joint component, characterized in that a stem tip support part fitted to the tip of the part is provided. The artificial hip joint component according to any one of claims 1 to 6,
The contact restricting portion is configured such that the inner periphery of the main body portion and the outer periphery of the end portion on the other end side of the stem member face each other with a space therebetween, and the other end side of the stem member. A component for an artificial hip joint, characterized by regulating contact with the outer periphery of the end of the hip. The artificial hip joint component according to any one of claims 1 to 6,
A region in which contact between the inner periphery of the main body and the outer periphery of the other end of the stem member is blocked by the contact restricting portion is filled with bone cement. Hip joint component. A component for artificial hip joints according to any one of claims 1 to 8,
At least one of a head ball member formed on the acetabular side of the femur and formed in a ball shape, and a stem member formed in a rod shape in which one end side is implanted in the femur;
An artificial hip joint unit characterized by comprising:

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