JP2002177307A - Acetabular cup assembly with selected bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a surgeon to select an optimal material of an acetabular cup assembly to be implanted in a specific site for implantation, its position and direction before or during operation so that operation may be made easy and less costly. SOLUTION: A surgeon can select an acetabular cup assembly before or during operation and secure bearing members in the shell member of the acetabular cup assembly. The bearing members are selected from a plurality of bearing elements having different characteristics such as characteristics of a bearing, securement characteristics, positioning characteristics, orientation characteristics, the surgeon can select characteristics most suited to a specific patient, which are determined by evaluation of conditions encountered in a site for implantation before or during operation, and desired characteristics can be easily and economically incorporated in the acetabular cup assembly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to an "ACETABULAR CUP" filed on May 22, 1998, filed on Application No. 09 / 083,406.
ASSEMBLY WITH SELECTED BEARING ”.

[0002]

The present invention generally relates to artificial implants.
(prosthetic implants), especially prosthetic implants
acetabularcup assembl to secure artificial bearing members in the acetabulum that accepts the femoral head of the etic hip joint
y).

[0003]

2. Description of the Related Art An indigenous hip joint is replaced with an artificial implant (pros).
The exchange with thetic implants is widespread and is occurring more frequently. Because of the various conditions encountered when performing such implantations, various bearing materials have been used which are located in optimal positions and orientations determined by the conditions encountered at the site of implantation. The size, position and orientation of the bearing members, as well as the choice of bearing material, are determined by surgery. Usually, such a choice is made on the basis of a prior assessment of the needs of the individual patient prior to surgery, but this choice may not be complete until the transplant site is actually operated and is encountered at that site Conditions are assessed during the transplant operation. Thus, it would be advantageous to have a wide range of intraoperative selections in addition to preoperative selections. This allows the surgeon to incorporate what is needed for an individual patient, either pre-operatively and / or by assessing the conditions encountered at a particular implantation site. Desirably.

[0004]

SUMMARY OF THE INVENTION The present invention seeks to determine the optimal material, position and orientation for an acetabular cup assembly to be implanted at a particular implantation site in a pre-operative or intraoperative manner in an easy and inexpensive manner. Offer the surgeon the possibility to choose. Thus, the present invention achieves several objects and advantages, some of which are summarized as follows. A wide selection of bearing materials in the bearing member of the acetabular cup assembly is possible, and a selection of the surface dimensions, position and orientation of the bearing member selected for the assembly having a particular acetabular shell is provided. In addition to the range of dimensions, the dimensions, position and orientation of the bearings have been expanded to allow practical choices, either pre-operatively or intra-operatively, to meet the demands imposed by the various conditions encountered at a particular implantation site. While increasing the surgeon's flexibility, he can make appropriate choices not only before surgery but also during surgery,
The accuracy and economy of natural hip replacement is increased, the surgeon has a wide range of options for pre-operative and intra-operative choices, and bearings of selected materials within the total acetabular shell. It can be easily and economically fixed, does not require complex and specialized equipment,
Having the proper bearing material and the correct size, position and orientation of the bearing member to facilitate inserting and securing the selected bearing member in the acetabular shell in the proper placement and orientation within the acetabular shell The present invention provides an acetabular cup assembly with low manufacturing and use costs and long-term reliability.

[0005]

SUMMARY OF THE INVENTION As above, further objects and advantages are achieved by the present invention, which briefly describes an acetabular cup assembly for receiving a proximal end of a femoral component of a hip implant. The thigh component includes a head member and a neck member subordinate to the head member, and the acetabular cup assembly includes an outer shell member having a cavity therein, and a bearing member secured within the cavity to receive the head member of the thigh component. With internal bearing members for rotation of The inner bearing member is selected from a plurality of bearing members having different characteristics, and the acetabular cup assembly is particularly selected from those having characteristics corresponding to the characteristics of the selected inner bearing member. The acetabular cup assembly
A metal securing member for receiving in the cavity of the acetabular shell,
A securing member extending between the upper and lower ends and including an outer securing element and an inner receptor element, and an outer receptor element on the bearing member, the outer receptor element and the inner receptor element matching the characteristics of the bearing member, When the receptor element and the internal receptor element are engaged with each other, the inner bearing member is secured by the securing member, and the lower end of the bearing member has an outer receptor element on the bearing member having a predetermined distance above the lower end of the securing member; The element is substantially complementary to the outer securing element of the securing member, such that when the outer securing element selectively engages the inner securing element, the securing member is within the shell member cavity selectively secured within the shell member. And internal securing elements. The predetermined distance between the lower end of the bearing member and the lower end of the securing member is such that the thigh component does not collide with the bearing member due to contact between the neck member of the thigh component and the lower end of the securing member.

[0006] The present invention further provides a shell member for an acetabular cup assembly having an internal bearing member for securing in a shell seat. The inner bearing member is selected from a plurality of bearing members having different characteristics, and the acetabular cup assembly selectively has characteristics associated with the characteristics of the selected inner bearing member. The shell member includes: An inner cavity, a first securing element in the cavity of the shell member, wherein the first securing element is compatible with at least one securing characteristic of the plurality of inner bearing members, and a second securing element, the plurality of inner bearings A second securing element within the cavity of the shell member that is compatible with the securing characteristics of at least another member of the member. The first securing element and the second securing element are arranged parallel to each other, and the effect of each of the first securing element and the second securing element is determined by the existence of the counterpart of the first securing element and the second securing element. The relative position of the first and second bearing members, respectively, so as to be effectively secured in the shell member.
It is possible to complete the acetabular cup assembly.

Further, the present invention includes a component kit for assembling an acetabular cup assembly having an internal bearing member secured within a shell member. The kit includes a plurality of bearing members having different characteristics wherein the acetabular cup assembly optionally has characteristics corresponding to a selected one characteristic of the inner bearing member. The shell member is an interior cavity, the first securing element is a first securing element in the shell member that matches at least one securing characteristic of the plurality of internal bearing members, and the second securing element is a plurality of internal bearing members. And a second securing element within the cavity of the shell member that is compatible with at least other securing characteristics of the shell member. The first securing element and the second securing element are arranged parallel to each other and are positioned relative to each other, and the effects of the first securing element and the second securing element are respectively equal to the first securing element and the second securing element. Maintained by the presence of the counterpart of the two securing elements, thereby selecting the internal bearing members from each other and effectively securing them within the shell member as a single selected bearing member, completing the acetabular cup assembly.

Further, the present invention provides an improved acetabular cup assembly method having an outer shell member having an inner cavity and an inner bearing member for securing in the cavity. The inner bearing member is selected from a plurality of bearing members having different characteristics, and the acetabular cup assembly selectively has characteristics corresponding to the characteristics of the selected inner bearing member. The improved method includes the following steps. The first securing element is at least one of the plurality of internal bearing members.
Providing a first securing element within the cavity of the shell member, the second securing element being compatible with at least other securing characteristics of the plurality of inner bearing members, the shell being compatible with the securing feature of the Providing a second securing element within the cavity of the member, selecting one of the inner bearing members and engaging the selected inner bearing member with a corresponding first or second securing element. And thereby securing the selected internal bearing member within the shell member to complete the acetabular cup assembly.

[0009] The following preferred embodiments, which are illustrated in the accompanying drawings, will provide a more complete understanding of the present invention, and will reveal further objects and advantages of the invention.

[0010]

DETAILED DESCRIPTION OF THE INVENTION Referring now particularly to FIGS. 1-3, an acetabular cup assembly according to the present invention is designated by the reference numeral 2.
It is indicated by 0. The acetabular cup assembly 20 includes a shell component in the form of a metal shell member 22 and a bearing insert, in this case a plastic bearing member 24. The shell member 22 includes an outer surface 26 having a contoured shape that allows the shell member 22 to be mounted and secured in a suitably formed acetabular component in a known manner. The shell member 22 is provided with a plurality of screw holes 28 for receiving anchor screws (not shown) when auxiliary fixing means is required. The internal cavity 30 extends upward in the shell member 22 from the lower opening 32 of the lower end 34 to the upper end 36. The rib 38 is attached to the lower end 34.

The bearing member 24 has a dome-shaped exterior 40.
And the dome substantially comprises a cavity 3 of the shell member 22.
It is complementary to zero and extends vertically from the base 42 to the tip 44. The base flange 46 is mounted on the bearing member 24.
Extends around the base 42 of the bearing member 24 and protrudes outward in the horizontal direction to form a horizontal bearing surface 48 on the base 42 of the bearing member 24. The bearing socket 50 is
It extends outwardly into the bearing member 24 to provide a spherical bearing surface 52 for the refilling thigh head.

The acetabular cup assembly 20 is optionally implanted. That is, the shell member 22 and the bearing member 24 are interoperatively operated.
Assembled to allow selection of the appropriate size, position and orientation of the bearing socket 50 based on pre-operative evaluation or evaluation of conditions encountered at the implantation site. At its end, another bearing member 24 can be used, which has a corresponding bearing socket 50 located at a different location and orientation relative to the mounted and fixed shell member 22. Is provided.
Any one of the bearing sockets 50 may be provided with a bearing surface 52 at the appropriate location and orientation to accommodate the needs of the patient, and may be fixed in place in the shell member 22 interoperatively. it can.

The selected bearing member 24 is secured in place in the shell member 22 by a securing mechanism 60 mounted adjacent the lower end 34 of the shell member 22 and adjacent the base 42 of the bearing member 24. Is done. Returning now to FIGS. 4 to 6 and FIGS. 1 to 3, the securing mechanism 60 extending horizontally outward into the shell member 22 adjacent to the lower end 34 has a securing element in the shape of an annular recess 62. You can see that it contains. Replenishment locking elements in the form of annular ribs 64 include:
It extends horizontally outward from the bearing member 24 and is adjacent to the base 42 of the bearing member 24. The preferred material for the plastic bearing member 24 is ultra-high molecular weight polyethylene commonly used for such bearing members, and the securing properties of this material are as shown in FIG. When the member 24 is inserted into the shell member 22 and the bearing member 24 is attached to the shell member 22, an annular rib 64 is mounted in the annular recess 62 sufficient to secure the bearing member 24 within the shell member 22. It has elasticity.

The position and orientation of the bearing socket 50 with respect to the fixed shell member 22 is selected by providing different positions and orientations of the bearing socket 50 within the bearing member 24, as described above. Thus, as shown in FIG. 1, the bearing socket 50 is offset from the central axis C of the bearing member 24 and is implanted by a different selectable bearing member 24, as shown by the diagonal lines of another embedded bearing socket 50A. A suitable position of the bearing socket 50 with respect to. Similarly, as shown in FIG. 1 by the diagonal lines of the bearing sockets 50B of different orientations, by preparing different angular directions, the bearing sockets 50B are provided.
Can take an appropriate orientation. When snapped into place, the selected bearing member 24 is secured within the shell member 22 by engaging complementary securing elements in the form of depressions 62 and ribs 64. This is compatible with the securing mechanism 60 provided for all other bearing members 24. Further, when the selected bearing member 24 is properly seated within the shell member 22, rotation of the bearing member 24 about the axis C relative to the shell member 22 causes the protrusions 70 radially extending inwardly from the ribs 38 of the shell member 22 to move. Is prevented by engagement of the bearing member 24 with the counterpart 72 of the bearing member 24 adjacent to the flange 46 of the bearing member 24.

[0015] Based on the patient's preoperative considerations, or due to the needs of the particular patient during the implantation procedure, the surgeon has determined that a bearing material having properties other than those of the material of the bearing member 24 is more appropriate. In some cases, the acetabular cup assembly 20 allows the acetabular cup assembly 20 to determine during a pre-operative review or a review of the conditions encountered at a particular implantation site.
It is possible for the surgeon to select a bearing member that has properties more suited to the needs of that particular patient. Accordingly, as shown in FIG. 7, the member provided as another bearing member 80 of the plurality of bearing members usable in the kit is made of a ceramic material and has a generally dome-shaped exterior 82 extending to a tip 84. including. The bearing socket 86 extends upwardly into the bearing member 80 to provide a spherical bearing surface 88 for a complementary thigh head (not shown).

Each part is a plastic bearing member 2
If it is not made of an elastic material like the material of No. 4, it is the most effective and convenient, it is mechanically simple and easy to use,
One of the securing mechanisms for securing mechanical parts together is to match a tapered surface. The taper angle of the tapered surface depends on the securing characteristics of the particular material being secured together. However, the fixing properties of the ceramic bearing member 80 are best when the fixing of the bearing material 80 is performed on a securing surface that is substantially cylindrical. Accordingly, the bearing member 80 includes an external receptor element in the form of a generally cylindrical securing surface 90 substantially parallel to the central axis C of the bearing member 80 and the bearing member 8.
0 and a dome-shaped exterior 82. After the shell member 22 is mounted in the acetabulum, the securing mechanism 60 is provided with a suitably tapered surface to enable intraoperative securing of the bearing member 80 within the shell member 22. Therefore, the securing mechanism 60 is connected to the lower end 1
Sleeve 1 having an annular ring portion 102 adjacent to the sleeve 03
00 metal securing member, ring 102 and upper end 1
And a dome portion 104 extending between the dome portion 105 and the dome portion 105. The dome portion 104 is substantially complementary to the counterpart of the interior cavity 30 of the shell member 22 and the ring portion 102 has an exterior securing element in the form of an exterior mounting surface 106 and a generally cylindrical interior securing surface 108. It has. Internal securing surface 10
The shape of the outer securing surface 90 and the shape of the outer securing surface 90 are compatible with the characteristics of the bearing member 80, and when the outer securing surface 90 and the inner securing surface 108 are engaged, an interference fit is formed.
As in (fit), the bearing member 80 is fixed to the sleeve 100.

The securing mechanism 60 is connected to the lower end 3 of the shell member 22.
The cavity 30 adjacent to 4 further includes an internal securing element in the form of an internal mounting surface 110 located on the shell member 22. The inner mounting surface 110 is the outer mounting surface 1
06 and is generally suitable for engaging mounting surfaces 106 and 110 as shown in FIG. The mounting surfaces 106 and 110 are tapered as shown at an angle A, the taper of the shape being consistent with the material retention characteristics of the sleeve 100 and the shell 22 and the sleeve 100 engaging the mounting surfaces 106 and 110 in engagement. The connection of the associated tapered mounting surfaces 106 and 110 allows the shell 2
2 is secured. In a preferred embodiment, the shell member 22 and the sleeve 100 are made of commercially available pure titanium and the angle A is about 6 °. The mounting surface 110 includes an upper end 112 and a lower end 114 and is divided by a recess 62 into an upper segment 116 and a lower segment 118 (see FIG. 4). By placing recess 62 substantially between upper end 112 and lower end 114, the engagement of mounting surfaces 106 and 110 and the connection of mounting surfaces 106 and 110 associated with such engagement is generally the same axial length. And therefore the segment 11 having the largest length
The connection made along 6 and 118 facilitates. In this way, when the sleeve 100 is inserted into the shell member 22 and subsequently makes the desired connection with the mounting surface 106, a proper alignment between the sleeve 100 and the shell member 22 is ensured. The effectiveness of the mounting surface 110 is not compromised by the presence of the depression 62.

Referring to FIGS. 11-13, if the surgeon wishes to use another material as the bearing material in the acetabular cup assembly 20, another bearing member made of the same material may be shelled. It can be used in the kit to secure it in member 22. Accordingly, the alternative bearing member 120 is made of another metal, for example, a cobalt-chromium alloy. Bearing member 120 includes a generally dome-shaped outer portion 122 that extends to a tip 124. Bearing socket 126 extends upwardly into bearing member 120 to provide a spherical bearing surface 128 for a complementary femoral head (not shown). The bearing member 120 comprises an external receptor element in the form of an external securing surface 130. Also, the securing mechanism 60
Includes a metal securing member shown in the form of a sleeve 140 having an annular ring portion 142 and a dome portion 144.
The dome portion 144 is substantially complementary to the counterpart of the interior cavity 30 of the shell member 22 and the ring portion 142 includes an outer securing element in the form of an outer mounting surface 146 and an inner securing element 14.
8 internal receptor elements.

The shape of the inner securing element 148 and the shape of the outer securing element 130 are compatible with the specific securing characteristics of the material of the bearing member 120 such that when the outer securing surface 130 engages the inner securing surface 148 Bearing member 120 is secured to sleeve 140 in connection with engagement and mounting on bearing member 120. At its distal end, the securing surfaces 130 and 148 are tapered at an angle B that provides a secure connection between the bearing member 120 and the sleeve 140. Meanwhile, the sleeve 140
Is secured within shell member 22 by the connection between mounting surfaces 146 and 110. In a preferred embodiment,
Both the sleeve 140 and the shell member 22 are made of commercially available pure titanium, and the mounting surfaces 146 and 110 are tapered at an angle A, and as described above in connection with the sleeve 100, Compatible with the securing properties of the material of the shell member 22. In this way, shell member 22 can receive any of a plurality of bearing materials made of different materials, such as bearing members 24, 80, 120 provided in the kit. Securing the selected bearing members is performed easily, accurately and with minimal effort before or during the operation and does not require complicated special equipment.

Referring to FIG. 14, it is desired to select a particular location on the bearing surface of the bearing member relative to the shell member in which the bearing member is secured. Another sleeve is provided using a sleeve-shaped metal securing member made in accordance with the present invention, such that the relative positions of the inner receptor element and the outer securing element differ from sleeve to sleeve. Thus, another sleeve 150 includes an inner securing surface 152 having a central axis 154 in which the inner receptor element extends longitudinally, and an outer securing element 156 having a central axis extending in the longitudinal direction, as seen at 159. As such, the central axis 154 is laterally offset from the central axis 158. The desired position of the bearing surface of the bearing member is determined by the sleeve 150 having a particular offset 159.

The desired orientation of the bearing surface of the bearing member is determined by selecting a sleeve oriented in that direction. As shown in FIG. 15, another sleeve 160 has an internally secured surface 162 having a central axis 164 extending longitudinally.
And the outer securing element includes an inner mounting surface 166 having a longitudinally extending central axis 166, the central axis 164 intersects the central axis 168 at an acute angle 169, and with the selection of the magnitude of the angle 169 the surfaces 162 and 166. Are selected at the same time. The desired configuration of the bearing surface of the bearing member is determined by selecting a sleeve 160 having a particular angle 169.

It will be understood that the selected positions and orientations described in connection with sleeves 150 and 160 are merely illustrative. Various combinations of positions and orientations and other positions and orientations are possible by changing the shape of the metal securing member, allowing the bearing surface of a particular bearing member to have the desired position and orientation.

Referring to FIGS. 16-18, another embodiment is shown in the form of an acetabular cup assembly 200. The acetabular cup assembly 200 includes a shell component in the form of a metal shell member 212 and a bearing insert in this case in the form of a plastic bearing member 214. The shell member 212 has a cross-sectional shape (profile config) which can be secured by mounting the shell member 212 at a predetermined position in a suitably prepared acetabular mortar by a known method.
uration). The inner cavity 220 extends from the lower opening 222 of the lower end 224 to the upper end 226.
, And extends upward into the shell member 212. Rib segment 228 is located at lower end 224 and finger 230 is subordinate to rib segment 228.
The preferred number of fingers 230 is four and is 90 degrees apart from each other for reasons that will be described in detail below.

The exterior 240 of the dome, which is substantially complementary to the cavity 220 of the shell member 212 and extends longitudinally from the base 242 toward the tip
14 generally has. Base flange 2
46 extends in the circumferential direction around the base 242 of the bearing member 214 and projects outward in the lateral direction so that the horizontal bearing surface (transver
se bearing face) 248. The bearing socket 250 extends upwardly into the bearing member 214 and provides a spherical bearing surface 252 for a complementary thigh head (not shown). Base flange 246 includes an upper lateral surface 254.

The acetabular cup assembly 200 must be assembled in stages. That is, based on a pre-operative evaluation or an evaluation of the conditions encountered at the implantation site, the shell member 212 and the bearing member 214 are assembled together so that the appropriate dimensions, position and orientation of the bearing socket 250 are possible. As a result, another bearing member 214 can be used, which provides an associated bearing socket 250 located at a different position and orientation with respect to the secured shell member 212, the bearing socket 250 in the shell member 212,
The bearing surface 252 can be secured in place during surgery, with the appropriate location and orientation to suit the needs of the patient. Thus, a kit of parts including a plurality of bearing members can be used for selection of a suitable bearing member 214.

The selected bearing member 214 is adjacent the lower end 224 of the shell member 212 and the bearing member 2
By the securing mechanism 260 adjacent to the 14 bases 242,
It is appropriately secured at a predetermined position in the shell member 212. Referring to FIGS. 19 and 20, and FIGS.
The shell member 212 extends laterally outwardly adjacent the lower end 234.
It can be seen that the securing mechanism 260 extending inward includes a securing element in the form of an annular recess 262. Annular rib 26
A complementary securing element in the form of 4 extends the base 242 of the bearing member 214 laterally outward from the adjacent bearing member 214. Plastic bearing member 2
Preferred materials for 14 are ultra-high molecular weight polyethylene (ultra-
high molecular weight polyethylene), and the securing property of the material is as shown in FIG.
4 into the shell member 212 and the bearing member 214
When mounted in the shell member, the annular ribs 264 are mounted in the annular recesses 262 and include sufficient resilience to ensure that the bearing member 214 is secured within the shell member 212.

The bearing member 21 in the shell member 212
In order to ensure that the mounting member 4 is mounted in the desired orientation, the bearing member 214 is in the vertical position shown in FIG. 19 and the bearing member 214 is in the desired orientation prior to securing by the effect of the rib 264 entering the annular recess 262. If not, the upper horizontal surface 254 of the flange 246 abuts so that the slave finger 230
4 is prevented from being completely inserted into the shell member 212. When the bearing member 214 rotates in the desired orientation, the notch 266 in the flange 246 causes the associated finger 230
Engage with. Notch 266 is designed to allow finger 230 to enter notch 266 so that bearing member 214 is fully engaged within shell member 212 when bearing member 214 is oriented properly with respect to shell member 212. can do. When the bearing member 214 is thus fully engaged within the shell member 212, the sharp edge 267 on the finger 230 is embedded in the material of the bearing member 214, as shown at 268, and the bearing member 214 and the shell member 212
To prevent micromotion between them. Due to the small gap at 269 between the portion of the upper horizontal surface 254 and the associated opposing portion of the lower end 224 of the shell member 212,
The bearing member 214 can be arbitrarily moved from the shell member 212 to a desired next movement.

Referring to FIG. 21, rib 264 includes a cross-sectional profile 270 to facilitate engagement of rib 264 into recess 262 and to enhance the coupling between bearing member 214 and shell member 212. ing. The cross-sectional profile 270 extends between an upper cross-section 272 opposite the tip 244 at the upper end of the bearing member 214, a lower cross-section 274 opposite the base 242 at the lower end of the bearing member 214, and an upper cross-section 272 and a lower cross-section 274. Intermediate section 2
76. The upper section 272 intersects the axial direction 282 at an acute angle 280 and the lower section 274 intersects the axial direction 282 at an obtuse angle 284. Intermediate section 276 intersects axial direction 282 with acute angle 280, acute angle 286 is less than acute angle 260, and defines tapered surfaces 290 and 292 along upper section 272 and intermediate section 276, respectively, while obtuse angle 284 is lower section. Connecting surface 294 along 274
Has been determined. The tapered surfaces 290 and 292 facilitate engagement of the ribs 264 into the recesses 262 during assembly, and once the assembly is complete, the connecting surfaces 294 retain the ribs 264 in the recesses 262. The overall profile 270 maximizes the area 296 at the root 298 of the rib 264 and maximizes the shear resistance of the material of the bearing member 214 at the base 298 of the rib 264. At the same time, as indicated by reference
The sharp edge 300 extending along 2 engages the rib 264 at the coupling surface 294 and prevents micro-motion between the bearing member 214 and the shell member 212.

To reiterate, based on the surgeon's pre-operative evaluation of the patient or the course of the implantation procedure, depending on the needs of the particular patient, the surgeon may require a bearing material having properties other than those of the material of the bearing member 214. If determined to be appropriate, a bearing material having properties other than those of the material of the bearing member 214, as determined by pre-surgical evaluation or by evaluation of conditions encountered at a particular implantation site, may be used. Being more suitable, the acetabular cup assembly 200 offers the surgeon the possibility to choose from a kit of parts with multiple bearing members, the bearing members exhibiting properties more suitable for the needs of that particular patient. Having. Accordingly, as shown in FIGS. 22-25, an alternative bearing member 310 is made of a ceramic material and includes a generally dome-shaped outer portion 312 extending to a tip 314. The bearing socket 316 extends upwardly into the bearing member 310 and is configured to engage the complementary femoral head 32 at the proximal end 322 of the femoral component 324.
0 provides a spherical bearing surface 318.

As described in the above embodiment in connection with FIGS. 7-10, bearing member 310 includes an external receptor element in the form of a generally cylindrical securing surface 330, and lower end 322 of bearing member 310. And domed outer part 31
2 and extends substantially parallel to the central axis C of the bearing member 310. In order to easily secure the bearing member 310 in the shell member 212 during the operation, after securing the shell member 212 in the acetabulum, the securing mechanism 2
60 provides a suitably compatible tapered surface. Accordingly, the securing mechanism 260 includes a metallic securing member shown in the form of a sleeve 340 having a ring 342 adjacent the lower end 344 and a dome 346 extending between the ring 342 and the upper end 348. The dome portion 346 is received opposite the internal cavity 220 of the shell member 212 and the ring portion 342 includes an external securing element in the form of an external mounting surface 350 and an internal receptor element in the form of a generally cylindrical internal securing surface 352. And The shape of the inner securing surface 352 and the shape of the outer securing surface 330 are compatible with the characteristics of the bearing member 310, and the outer securing surface 330 and the inner securing surface 3 are compatible.
52 is engaged by interference fit or the like, the bearing member 310 is secured to the sleeve 340.

The securing mechanism 260 includes the shell member 212 in the cavity 220 adjacent to the lower end 224 of the shell member 212.
And an internal securing element in the form of an internal mounting surface 354 located at Due to the compatible engagement of mounting surfaces 350 and 354 shown in FIG.
4 is generally complementary to the outer mounting surface 350. Mounting surfaces 350 and 354 have a tapered shape indicated by angle 356, which is compatible with the material properties of sleeve 340 and shell member 212, and
Is secured within the shell member 212 by the connection of the tapered mounting surfaces 350 and 354 in connection with the engagement of the mounting surfaces 350 and 354. In a preferred embodiment, shell member 212 and sleeve 340 are made of commercially available pure titanium and angle 356 is about 6 °. The mounting surface 354 includes an upper end 360 and a lower end 362 and is divided by a recess 262 into an upper segment 364 and a lower segment 366. When the recess 262 is substantially intermediate between the upper end 360 and the lower end 362, the mounting surface 3
The engagement of 50 and 354 and the connection of mounting surfaces 350 and 354 corresponding to such engagement is generally the same, so that the connection of the connection made along segments 364 and 366 having the greatest axial length. The effect is easier. In this manner, when the sleeve 340 is inserted into the shell 212, proper alignment between the sleeve 340 and the shell 212 is ensured, and the next mounting surface 350
The effectiveness of mounting surface 354 in making the desired engagement with is not compromised by the presence of recess 262.

Flange 370 extends horizontally outward from lower end 334 of sleeve 340. To ensure that the sleeve 340 and the bearing member 310 are oriented in the desired orientation within the shell member 212, prior to the effect of fully attaching and securing the sleeve 340 and the bearing 310,
If the sleeve 340 is in the vertical position shown in FIG. 23 and the sleeve 340 is not in the predetermined orientation, the flange 37
0 abuts the upper horizontal surface 372 so that the slave finger 230 causes the sleeve 340 to attach to the shell member 212.
Prevents complete insertion of When the sleeve 340 is rotated to the desired orientation, the notch 376 in the flange 370 snaps into the associated finger 230. Notch 376
Are designed so that the finger 230 enters the notch 376 so that the sleeve 34
Axial alignment of the sleeve 340 and bearing 310 with the shell member 21
2 can be completely engaged. Upper horizontal surface 372
The small gap at 378 between the shell member 212 and the associated opposing portion of the lower end 224 of the shell member 212 allows the bearing member 310 to move freely from the shell member 212.

23 and 24, best shown in FIG. 25 is the lower end 33 of the bearing member 310.
2 is upwardly separated by a fixed distance 380 from the lower end 344 of the sleeve 340. When the thigh head 320 of the thigh component 324 engages the bearing surface 318 of the bearing member 310, the rotational movement of the proximal end 322 of the thigh component 324 causes the neck 382 of the thigh component 324 and the sleeve 340 to move, as shown at 384. Limited by engagement with lower end 344. In this manner, collision of the proximal end 322 of the femoral component 324 onto the bearing member 310 is avoided, thereby eliminating a potential source of damage to the bearing member 310 when using the acetabular cup assembly 200. .

In the alternative shown in FIG. 26, as shown at 390, the lower end of the sleeve 340 is modified to receive a ring-shaped cushion 392 secured at the lower end 390. The cushion 392 is made of an elastic synthetic polymer material (resili
ent synthetic polymeric material) so that the cushion 392 is interposed between the lower end of the sleeve 340 and the proximal end 322 of the thigh component 324,
4 substantially absorbs the shock associated with the engagement of the proximal end 322 with the sleeve 340.

It can be seen that the acetabular cup assemblies 20 and 200 allow the surgeon to select a wide range of characteristics of the bearing members of the acetabular cup assembly before or during surgery, easily and at low cost. Such properties include materials, dimensions, positioning and orientation. In this way, the present invention achieves several of the objects and advantages summarized above. That is, even with the use of a normal acetabular shell, there is the possibility of selecting a wide range of bearing materials in the bearing member of the acetabular cup assembly, the dimensions of the bearing surface of the bearing member to be combined with a particular acetabular shell, Possibility of position and orientation selection, increasing the range of bearing sizes, positions and orientations in addition to the bearing material and giving practical possibilities of pre-operative or intra-operative selection and encountered at specific implantation sites While meeting the requirements imposed by various conditions,
Surgeons give different patients needs with greater freedom, can make appropriate choices not only during surgery but also before surgery, increase the accuracy of natural hip replacement, are more economical and offer a wider range of options Surgeons can choose before and during surgery,
Easily and economically secured without complicated special equipment in the acetabular shell compatible with the bearing material of the selected material, with appropriate bearing members and precise dimensions, position and orientation Provides an acetabular cup assembly with economical manufacture and long-term reliability.

It is to be understood that the above detailed description of the embodiments cited in the present invention is provided by way of example only. Various details of the design, manufacture, and practice of the appended claims may be varied without departing from the true spirit and scope of the invention. The exclusive rights or privileges in embodiments of the present invention are defined in the claims.

[Brief description of the drawings]

FIG. 1 is an exploded elevation view of a partial cross section of an acetabular cup assembly made in accordance with the present invention.

FIG. 2 is a plan view of a shell component of the acetabular cup assembly.

FIG. 3 is a plan view of the bearing insert of the acetabular cup assembly.

FIG. 4 is a partially enlarged view of a part of the shell part shown in FIG. 1;

FIG. 5 is a partially enlarged view of a part of the bearing insert shown in FIG. 1;

FIG. 6 is a partial enlarged view of the portion shown in FIGS. 4 and 5 incorporating the acetabular cup assembly.

FIG. 7 is an exploded elevation view of a partial cross section of the acetabular cup assembly shown with alternative parts.

FIG. 8 is a top view of the securing component of the acetabular cup assembly.

FIG. 9 is a partially enlarged view of a part of the securing component shown in FIG. 7;

FIG. 10 is a partially enlarged cross-sectional view of the acetabular cup assembly incorporating the components shown in FIG. 7;

FIG. 11 is an enlarged elevational view in partial cross section of an alternative security component and bearing insert for an acetabular cup assembly.

FIG. 12 is a partially enlarged view of a part of the securing component of FIG. 11;

FIG. 13 is a partially enlarged view of a portion of an acetabular cup assembly utilizing the alternative components shown in FIG. 11, incorporating the components.

FIG. 14 is an elevational sectional view of an alternative security component.

FIG. 15 is an elevational sectional view of another alternative securing component.

FIG. 16 is an exploded elevation view, partially in section, of another acetabular cup assembly made in accordance with the present invention.

17 is a partially enlarged view of a part of the shell component shown in FIG.

FIG. 18 is a partially enlarged view of a part of the bearing insert shown in FIG. 16;

FIG. 19 is a partially enlarged view of the portion shown in FIGS. 17 and 18 with the bearing insert inserted into the shell component.

FIG. 20 shows the acetabular cup assembly incorporated, FIG.
FIG. 19 is a partially enlarged view of a portion illustrated in FIGS. 7 and 18.

FIG. 21 is a partially enlarged view of a part of FIG. 18;

FIG. 22 is an exploded elevation view, partially in section, of another embodiment including an assembly in which the bearing components are incorporated into the securing component.

FIG. 23 is a partial enlarged view of the securing and bearing component assembly with the assembly inserted into the acetabular shell.

FIG. 24 is a partial enlarged view similar to FIG. 23 showing the securing part and the bearing part assembly incorporated into the acetabular shell;

FIG. 25 is a longitudinal sectional view of the assembled securing part, the bearing part, and the acetabular shell with the thigh head of the thigh part engaged with the securing part.

FIG. 26 is a partially enlarged longitudinal sectional view of a modified structure.

Continued on the front page (72) Inventor Nicholas N.G. Don, 07424, NJ, USA, Little Falls, Donat Drive 46 F-term (reference) 4C097 AA06 BB01 CC13 CC17 SC05

Claims (34)

[Claims] 1. An acetabular cup assembly for receiving a proximal end of a femoral component of a hip prosthesis, wherein the femoral component includes a head member and a neck member subordinate to the head member, the acetabular cup assembly comprising: A shell member having an internal cavity; and an internal bearing member for receiving and performing a rotational motion therein within the head member to secure within the cavity, the internal bearing members having different characteristics. Wherein the acetabular cup assembly has characteristics corresponding to the selected characteristics of the inner bearing member, wherein the acetabular cup assembly has a characteristic between an upper end and a lower end. An elongation, a metal securing member including an external securing element and an internal receptor element and received in the cavity of the shell member; An outer receptor element on a member, wherein the outer receptor element and the inner receptor element are compatible with the particular characteristics of the bearing member and engage the outer receptor element with the inner receptor element; An inner receptor member that is spaced upwardly a predetermined distance from a lower end of the securing member and that is externally secured to the securing member at a lower end of the bearing member; and substantially complementary to an external securing element of the securing member. And
An inner securing element in the cavity of the shell member, wherein the securing member is selectively secured in the shell member when the outer securing element and the inner securing element are selectively engaged. The predetermined distance between the lower end of the bearing member and the lower end of the securing member is harmful to the bearing member of the thigh component due to contact between the neck member of the thigh component and the lower end of the securing member. An acetabular cup assembly adapted to prevent collisions. 2. The interior securing element of the shell member and the exterior securing element of the securing member define a complementary tapered security surface for mating with a mating engagement at the complementary security surface. The acetabular cup assembly of claim 1, comprising: 3. The securing element of claim 2, wherein the inner receptor element of the securing member and the outer receptor element of the bearing member include a complementary securing surface for mating with a mating engagement at the complementary securing surface. The acetabular cup assembly of claim 2, wherein 4. The complementary securing surface of the external receptor element includes a complementary tapered surface for mating responsive to conformal engagement at the complementary securing surface. The acetabular cup assembly according to claim 3. 5. The shell member includes a lower end and an upper end,
The acetabular cup assembly according to claim 4, wherein the cavity extends from the lower end of the shell member toward the upper end, and the internal securing element is located adjacent the lower end of the shell member. . 6. The acetabular cup assembly according to claim 5, wherein the internal securing element is located adjacent to the lower end of the metallic securing member. 7. The metal securing member includes a ring portion adjacent to the lower end, and a dome portion extending between the ring portion and the upper end of the metal securing member. The acetabular cup assembly according to claim 6. 8. The shell member includes at least one subordinate finger extending downwardly from the lower end of the shell member, and the metallic securing member includes the complementary taper of the shell member and the securing member. A flange extending outwardly from a lower end of the securing member to engage the subordinate finger, and at least one notch in the flange to prevent conformal engagement at the securing surface. The notch is designed such that when the notch is aligned with the finger, the finger is received in the notch, and such alignment of the notch and the finger is performed by the securing member and the bearing member therein. A desired coordination and alignment achieved with said complementary tapered surface in said desired coordination and alignment The acetabular cup assembly according to claim 7, wherein conformational engagement with the bearing member is enabled. 9. The shell member includes a lower end and an upper end, the cavity extends from the lower end of the shell member toward the upper end, and the internal receptor element is between the lower end and the upper end of the shell member. A longitudinally extending central axis, wherein the outer securing element includes a longitudinally extending central axis between the lower end and the upper end of the shell member, and wherein the central axis of the inner receptor element is The acetabular cup assembly according to claim 1, wherein the acetabular cup assembly is horizontally offset from the central axis. 10. The interior security element of the shell member and the exterior security element of the shell member define a complementary tapered security surface for mating corresponding to a mating engagement of the complementary security surface. The acetabular cup assembly of claim 9, comprising: 11. The retaining element of the securing member and the external receptor element of the bearing member include complementary securing surfaces for mating by mating engagement of the complementary securing surfaces. The acetabular cup assembly of claim 10, wherein: 12. The complementary securing surface of the outer receptor element includes a complementary tapered surface for mating in connection with a conformal engagement of the complementary securing surface. The acetabular cup assembly of claim 11. 13. The shell member includes at least one subordinate finger extending downwardly from the lower end of the shell member, and the metallic securing member includes a complementary tapered securing surface of the shell member and the securing member. A flange extending laterally outwardly from said lower end of said securing member to engage said subordinate finger, and at least one notch therein. The notch is designed such that when the notch is aligned with the finger, the finger is received in the notch, and such alignment of the notch and the finger is such that the securing member and the bearing member therein. And the complementary taper in said desired coordination and alignment. The acetabular cup assembly according to claim 12, wherein a conformable engagement between a surface and the bearing member is enabled. An acetabular cup assembly according to claim 12. 14. The shell member includes a lower end and an upper end,
The cavity extends from the lower end of the shell member toward the upper end, the inner receptor element includes a central axis extending longitudinally between the lower end and the upper end of the shell member, and the outer securing element includes 2. The apparatus of claim 1, further comprising a central axis extending longitudinally between the lower end and the upper end of the member, wherein the central axis of the internal receptor element intersects the central axis of the external securing element at an acute angle. Acetabular cup assembly. 15. The inner securing element of the shell member and the outer securing element of the securing member define a complementary tapered securing surface for mating corresponding to a mating engagement of the complementary securing surface. The acetabular cup assembly according to claim 14, comprising: 16. The internal securing element of the securing member and the external receptor element of the bearing member include complementary securing surfaces for mating corresponding to the mating engagement of the complementary securing surfaces. The acetabular cup assembly according to claim 15, wherein 17. The complementary securing surface of the outer receptor element includes a complementary tapered surface for mating corresponding to a mating engagement with the complementary tapered surface. An acetabular cup assembly according to claim 16. 18. The shell component includes at least one subordinate finger extending downwardly from a lower end of the shell member, wherein the metallic securing member is provided on the complementary tapered securing surface of the shell member and the securing member. A flange extending laterally outwardly from the lower end of the securing member to engage the dependent finger to prevent conforming engagement, and at least one notch in the flange. The notch is designed such that when the notch is aligned with the finger, the finger is received in the notch, and such alignment of the notch and the finger is performed by the securing member and the bearing member therein. A desired configuration and alignment achieved by the complementary taper table in the desired configuration and alignment The acetabular cup assembly according to claim 17, wherein a conformable engagement between a surface and the bearing member is enabled. 19. The acetabular cup assembly according to claim 1, wherein the lower end of the securing member includes a cushion for intermediate insertion between the securing member and the thigh component. 20. An inner bearing member for securing within a shell member, wherein the inner bearing member is selected from a plurality of bearing members having different characteristics, and wherein the acetabular cup assembly is selected from the selected inner bearing member. A shell member for a cup assembly, wherein the shell member selectively has characteristics related to the characteristics of: wherein the shell member is within the cavity of the shell member and at least one of the plurality of internal bearing members. A first security element that is compatible with security properties and a second security element that is in the cavity of the shell member and that is compatible with security properties of at least one of the plurality of internal bearing members; The first securing element and the second securing element are arranged in parallel with each other and are located at a certain relative position, and the first securing element and the second securing element The respective effectiveness of the retaining elements is maintained by the presence of the counterparts of the first securing element and the second securing element, whereby each one of the inner bearing members is adapted to complete the acetabular cup assembly. A shell member for a cup assembly that can be selected for effective retention in the shell member. 21. The shell member includes a lower end and an upper end,
The cavity extends from the lower end of the shell member toward the upper end, and the first securing element and the second securing element are disposed adjacent the lower end of the shell member. Item 21. A shell member for a cup assembly according to item 20. 22. The bearing member includes a rib protruding from the bearing member and the first securing element includes a recess in the shell member for receiving the rib of the bearing member. The shell member for a cup assembly according to claim 21. 23. The bearing member includes the exterior security surface, the second security element includes an interior security surface,
The inner securing surface and the outer securing surface are configured for mating corresponding to the complementary tapered conformational engagement,
The shell member for a cup assembly according to claim 21, wherein the shell member has a complementary tapered shape. 24. The bearing member includes a rib protruding from the bearing member, the first securing element includes a recess in the shell member for receiving the rib of the bearing member, and a taper of the internal securing surface. A shape extending between an upper end and a lower end, wherein the depression is located between the upper end and the lower end of the tapered shape of the internal securing surface to form an upper internal securing surface segment and a lower internal securing surface segment; Each of the interior securing surface and the lower interior securing surface has a length between the upper and lower ends of the interior securing surface sufficient to maintain the securing effect across the interior securing surface. 24. The shell member for a cup assembly according to claim 23. 25. The shell member for a cup assembly according to claim 24, wherein the depression is disposed substantially in the middle of the interior securing surface. 26. The bearing member includes an upper end and a lower end axially spaced from the upper end, wherein the rib has an upper portion facing the upper end of the bearing member,
An upper portion having a cross-sectional profile having a lower portion facing the lower end of the bearing member and an intermediate portion between the upper portion and the lower portion, the upper portion forming a first acute angle with the axial direction, and Forms an obtuse angle with the axial direction, the intermediate portion forms a second acute angle with the axial direction, the second acute angle is smaller than the first acute angle, and therefore the ribs along the upper and intermediate portions Are formed along the lower portion along with a tapered surface that facilitates engagement within the recess and a connecting surface for retaining the rib within the recess, while the rib provides resistance to shear from the bearing member. The shell member for a cup assembly according to claim 25, comprising a shell member. 27. A kit of parts for assembling an acetabular cup assembly having an internal bearing member secured in a shell member, the kit having different characteristics, wherein the acetabular cup assembly has an internal bearing member. A shell member comprising a plurality of bearing members having properties associated with a selected one property of the bearing member, wherein the shell member has an interior cavity and at least one of the plurality of interior bearing members in the cavity of the shell member. A first securing element that matches the securing property of one of the plurality of inner bearing members and that matches a securing property of at least one of the plurality of internal bearing members. The first securing element and the second securing element are installed in parallel with each other, and each of the first securing element and the second securing element Selected to complete the acetabular cup assembly, such that efficacy is maintained in the presence of respective counterparts of the first securing element and the second securing element. Said 1
A kit of parts, wherein each of said one and said other one of said internal bearing members can be selected so as to be effectively secured within said shell member as a single bearing member. 28. The shell member includes a lower end and an upper end,
The cavity extends from the lower end of the shell member toward the upper end, and the first securing element and the second securing element are disposed adjacent to the lower end of the shell member. Item 29. The component kit according to Item 27. 29. The bearing member includes a rib protruding from the bearing member, and the first securing element includes a recess in the shell member for receiving the rib of the bearing member. 29. The parts kit according to 28. 30. The bearing member includes an exterior security surface, the second security element includes an interior security surface, and the exterior security surface and the interior security surface engage the complementary tapered conforming engagement. 29. The kit of claim 28, having a complementary tapered shape for associative connection. 31. The bearing member includes a rib protruding from the bearing member, the first securing element includes a recess in the shell member for receiving the rib of the bearing member, and wherein the first securing element includes a recess in the shell member for receiving the rib of the bearing member. A taper extends between the upper end and the lower end, and the recess is located midway between the upper and lower ends of the tapered shape of the interior securing surface, thereby forming an upper interior securing surface segment and a lower interior securing segment. And each of the upper internal securing surface segment and the lower internal securing surface segment has a sufficient length between the upper and lower ends of the internal securing surface to maintain the securing effect across the securing surface. The parts kit according to claim 30, characterized in that: 32. The kit of claim 31, wherein the depression is located substantially midway between the upper end and the lower end of the interior securing surface. 33. An improved method of implanting an acetabular cup assembly having an inner cavity with a shell member and an inner bearing member for securing in the cavity, wherein the inner bearing member has different characteristics. Wherein the acetabular cup assembly selectively has a property related to the property of the selected inner bearing member, and wherein the improved method comprises at least one of the plurality of inner bearing members. Providing a first securing element within the cavity of the shell member to be compatible with one securing feature; and compatible with at least one other securing feature of the plurality of internal bearing members. Providing a second securing element within the cavity of the shell member; and providing any one of the internal bearing members Selecting and securing the selected inner bearing member with the associated first securing element or the second securing element to complete the acetabular cup assembly. How to become. 34. The method of claim 33, including implanting the shell member at an implantation site before securing the selected inner bearing member within the cavity of the shell member. the method of.