TWI742925B - Tool for bone implant - Google Patents

Abstract

A tool for bone implant is prestened to solve the problem that conventional surgical tools cannot control the rotational torque. This tool comprises a rod member with a coupling part, the coupling part has a through hole, the rod member has a measuring arm and a force applying arm connected to the coupling part, the measuring arm has a first extension section, The first extension section has a first indicator portion, the force application arm has a second extension section, and the second extension section has a second indicator portion. The force application arm is elastically deformable away from the measuring arm, so that the second extension section is displaced relative to the first extension section; and an adaptor is combined with the through hole, the adaptor has an outer ring member and an inner ring member, the outer ring member is relative to the inner ring member rotate in a single direction.

Description

Instruments for orthopedic implants

The invention relates to a surgical instrument, in particular to an orthopedic implant instrument used for bone nail implantation surgery.

In the treatment of bone damage caused by external force, disease or degeneration, the bone nail can be implanted into the damaged bone to increase the strength of the bone, or to fix the bone to facilitate healing. Generally speaking, during bone screw implantation surgery, a hand-held surgical tool similar to a screwdriver is used to rotate the bone screw to screw it into the bone. When the bone screw is screwed into the bone, it will produce squeezing stress on the bone tissue. According to the publication and discussion of domestic and foreign literature on bone injury, it can be known that when the stress is too large, it will cause osteonecrosis (Osteonecrosis), and the appropriate stress will increase the growth rate of bone tissue. Therefore, when performing bone nail implantation surgery, it is The stress of squeezing bone tissue can be controlled by controlling the rotating torque of the bone nail. However, the conventional instrument used to measure the torque is a precision machine and cannot be sterilized and is suitable for bone nail implantation. The current surgical tools cannot let the surgeon know the torsion force of each rotation controlled by the surgeon. Therefore, it is easy to cause the surgeon to exert too much force and adversely affect the bone tissue.

In view of this, it is indeed necessary to improve the conventional surgical tools.

In order to solve the above problems, the purpose of the present invention is to provide a device for orthopedic implants Machine, which is able to know the torsion force when rotating the bone nail.

The second objective of the present invention is to provide an instrument for orthopedic implants, which can be sterilized at high temperature.

The directionality described in the full text of the present invention or its similar terms, such as "front", "rear", "left", "right", "up (top)", "down (bottom)", "inner", "outer" , "Side", etc., mainly refer to the direction of the attached drawings. The terms of the directionality or similar terms are only used to assist in the description and understanding of the embodiments of the present invention, and are not used to limit the present invention.

The elements and components described in the full text of the present invention use the quantifiers "one" or "one" for convenience and to provide the general meaning of the scope of the present invention; in the present invention, it should be construed as including one or at least one, and single The concept of also includes the plural, unless it clearly implies other meanings.

Approximate terms such as "combination", "combination" or "assembly" mentioned in the full text of the present invention mainly include the types that can be separated without destroying the components after being connected, or the components cannot be separated after being connected, which are common knowledge in the field Those can be selected based on the materials of the components to be connected or assembly requirements.

The apparatus for orthopedic implants of the present invention includes: a rod body with a coupling part, the coupling part having a through hole, the rod body having a measuring arm and a force arm connected to the coupling part, the measuring arm The measuring arm has a first extension, the first extension has a first indicator, the forcing arm has a second extension, the second extension has a second indicator, the forcing arm is elastically deformable Away from the measuring arm, so that the second extension section is displaced relative to the first extension section; and an adapter, having an outer ring member and an inner ring member, and the upper and lower sides of the outer ring member have open ends Each has an inner ring flange, the inner diameter and outer diameter of the inner ring member are variable to be inserted between the two inner ring flanges, the outer ring member is coupled to the through hole, and the outer peripheral surface of the outer ring member has A plurality of first tooth-like structures, the inner circumferential surface of the through hole does not match the plurality of first tooth-shaped structures to reduce the contact area, and the inner circumferential surface of the inner ring has a plurality of first tooth structures With a two-tooth structure, the outer ring member rotates in a single direction relative to the inner ring member.

Accordingly, the device for orthopedic implants of the present invention can rotate the rod body by applying force to the force application arm, and the torsion force generated by the force application arm can make the second extension section relative to the first extension section The displacement is formed, and the position of the second indicating portion corresponding to the first indicating portion can be used to know the degree of torsion generated by the forcing arm, so that the user can lock the bone nail assembly into a predetermined position when rotating and locking the bone nail assembly into a predetermined position. The magnitude of the generated torsion can be known, and the torque can be controlled not to exceed 35Ncm, so as to avoid damage to the bone tissue caused by excessive torsion, and to further rotate the rod body with the most suitable torque. In addition, the orthopedic implant of the present invention The material instrument measures the torsion force through the elastic deformation of the force arm of the rod body, so that the rod body can be sterilized at high temperature, and can be applied to bone nail implantation operations, which can reduce the risk of surgery and improve the quality of medical treatment. And other effects. On the other hand, the adapter has a small number of components and is easy to assemble. The first tooth structure of the outer ring can improve the convenience of assembly and disassembly between the rod body and the adapter. The inner diameter and outer diameter are variable and the second tooth-like structure is provided, which can improve the practicability and the convenience of assembling and disassembling between the rod body and the bone nail assembly.

Wherein, the rod body can be made of titanium alloy material. In this way, the rod body can be made flexible and rigid to a certain degree, which has the effect of improving the convenience of use.

Wherein, the titanium alloy is Ti ₆ Al ₄ V. In this way, the rod body can be made flexible and have a certain degree of rigidity, which has the effect of improving the convenience of use.

Wherein, the joint portion may have an expansion gap, an open end of the expansion gap communicates with the through hole, and the expansion gap extends in the joint portion to form a closed end. In this way, the diameter of the through hole can be slightly enlarged, so that the through hole can be sleeved on a larger diameter adapter, which has the effect of improving the stability of the combination of the through hole and the adapter.

Wherein, the expansion gap may be enclosed in a circular shape and extend in the joint portion. In this way, the extension length of the expansion gap can be increased, which has the effect of evenly dispersing the stress generated by the diameter expansion of the through hole.

Wherein, the measuring arm and the forcing arm are not connected to each other and are connected in parallel to the coupling part. In this way, the connection between the forcing arm and the connecting portion is a fulcrum, so that the forcing arm can be elastically deformed away from the measuring arm, which has the effect of measuring the torsion force of the forcing arm.

Wherein, the measuring arm system may have a frame, the frame has an opening, and the second extension section extends into the frame through the opening. In this way, the second extension section can be displaced relative to the first extension section in the frame body, which has the effect of measuring the torsion force of the applying arm.

Wherein, the minimum cross-sectional area of the connection between the forcing arm and the coupling portion may be less than 50% of the minimum cross-sectional area of the coupling portion. In this way, the force applying arm can be easily elastically deformed with the fulcrum, which has the effect of improving the convenience of use.

Wherein, the inner peripheral surface of the outer ring member may have at least one unidirectional tooth, and the outer peripheral surface of the inner ring member may have several unidirectional ratchet teeth, so that the outer ring member can only drive the inner ring member to form a single direction Spin. In this way, the user can rotate the rod body alternately clockwise and counterclockwise to rotate and lock the bone screw assembly into the bone tissue, so that the user can still perform surgery on the part with limited rotation range. It has the effect of improving the convenience of use.

1: Rod body

11: Joint

12: Through hole

13: Expansion gap

13a, 21: open end

13b: closed end

14: Measuring arm

14a: Frame

14b: opening

14c: Stop block

15: The first extension

16: The first indicator

17: force arm

18: second extension

19: The second instruction section

2: Adapter

2a: Outer ring

2b: inner ring

22: inner ring flange

23: One-way tooth

24: One-way ratchet

25: The first tooth structure

26: The second tooth structure

T: Bone nail component

T1: grab head

T2: Screw body

L: axis

D: circumferential direction

[Figure 1] An exploded perspective view of an embodiment of the present invention.

[Figure 2] An exploded perspective view of the adapter of the present invention.

[Figure 3] Combination diagram of an embodiment of the present invention.

[Figure 4] A cross-sectional view along the line A-A in Figure 3.

[Figure 5] A schematic diagram of the action of rotating the lever body according to an embodiment of the present invention.

[Figure 6] A diagram of the use of the rotating bone nail assembly locked into bone tissue according to an embodiment of the present invention.

[Figure 7] A schematic diagram of the separation of an embodiment of the present invention from the bone nail assembly after the bone nail assembly is locked in.

[Figure 8] A schematic diagram of removing the grabbing head of the bone screw assembly.

In order to make the above and other objectives, features and advantages of the present invention more comprehensible, the following describes the preferred embodiments of the present invention in conjunction with the accompanying drawings in detail as follows:

Please refer to Figures 1 and 2, which is an embodiment of the device for orthopedic implants of the present invention. It includes a rod body 1 and an adaptor 2 which is coupled to the rod body 1. Moreover, the adapter 2 can be used to combine a conventional bone fixation component T.

The rod body 1 is made of a material with flexibility and a certain degree of rigidity, so that the rod body 1 has sufficient strength for the user to apply force. For example, the rod body 1 may be made of stainless steel, preferably It can be made of titanium alloy. In this embodiment, the rod body 1 is made of Ti ₆ Al ₄ V. The rod body 1 has a coupling portion 11, and the coupling portion 11 has a through hole 12 for accommodating the aforementioned adaptor 2. The geometric center of the through hole 12 may have an axis L, so that the rod body 1 can rotate with the axis L as the axis. The coupling portion 11 is preferably located at one end of the lever body 1. In this way, the user can apply force from the other end of the lever body 1 with a longer force arm, which has The role of labor-saving. In this embodiment, the connecting portion 11 may have an expansion gap 13 which penetrates through two opposite surfaces of the connecting portion 11, an open end 13a of the expansion gap 13 is connected to the through hole 12, and the expansion gap 13 The gap 13 extends in the joining portion 11 to form a closed end 13b. In this way, the expanded gap 13 can form an elastic deformation space, so that the through hole 12 can be slightly expanded in diameter, so that the through hole 12 can be sleeved The adapter 2 with a larger diameter can improve the stability of the combination with the adapter 2. In addition, the expansion gap 13 is preferably encircled in a circular shape and extends in the joining portion 11 to increase the extension length of the expansion gap 13, so as to evenly disperse the stress generated by the diameter expansion of the through hole 12 .

Continuing to refer to Figures 1 and 3, the rod body 1 has a measuring arm 14. The measuring One end of the arm 14 is preferably connected to the coupling portion 11 in an integral manner. The measuring arm 14 has a first extending section 15 protruding from one side of the measuring arm 14. The rod body 1 can form a virtual circumferential direction D when rotating about the axis L. The first extension section 15 may extend in the circumferential direction D. In this embodiment, the measuring arm 14 has a frame 14a, the frame 14a may be rectangular and has an opening 14b, and the first extension 15 may be located on one of the long sides of the frame 14a. The first extension 15 has a first indicator 16 that can be used to display the degree of torsion of the lever body 1 rotating. For example, the first indicator 16 can be a color block of different colors, a gradient The layer color, or digital scale, is not limited by the present invention. In this embodiment, the first indicator 16 is a scale group to provide the user with the most direct information.

The lever body 1 has an urging arm 17, one end of the urging arm 17 is preferably connected to the coupling portion 11 in an integral manner, and the urging arm 17 and the measuring arm 14 preferably extend side by side without being connected to each other form. The connection between the forcing arm 17 and the coupling portion 11 can be used as a fulcrum, so that the forcing arm 17 can be elastically deformed away from the measuring arm 14. In this embodiment, the connection between the forcing arm 17 and the coupling portion 11 The minimum cross-sectional area of is preferably less than 50% of the minimum cross-sectional area of the connecting portion 11, so that the forcing arm 17 can be easily elastically deformed by the fulcrum. The forcing arm 17 has a second extension section 18, and the second extension section 18 extends in the same direction as the first extension section 15, that is, the second extension section 18 extends in the circumferential direction D, the The second extension section 18 is preferably adjacent to the first extension section 15, so that when the force applying arm 17 is far away from the measuring arm 14, the second extension section 18 can be displaced relative to the first extension section 15. In this embodiment, the second extension section 18 can extend into the frame 14a through the opening 14b.

The second extension section 18 has a second indicator portion 19 that is positioned on the first indicator portion 16 so that the second indicator portion 19 can be used to display the degree of torsion of the rod body 1 rotating, in detail However, the second indicator portion 19 may have an indicator mark corresponding to the first indicator portion 16. For example, the second indicator portion 19 may be an arrow or a marking line to indicate the color block or gradient. Color, or digital scale. In this embodiment, the second indicator portion 19 may be a triangular protrusion protruding from a side edge of the second extension section 18, and the opening 14b of the frame 14a may have a stopper 14c, which stops The block 14c can block the second indicating portion 19, so that the first indicating portion 16 can be set to a predetermined value at the stop block 14c, and the predetermined value can be a torque limit value. When the indicating portion 19 abuts on the stop block 14c, it can remind the user that the torsion of the lever body 1 is too large, which has the effect of reducing the user's operational errors. In addition, the second indicating portion 19 may also be a color block, a gradient color, or a digital scale to correspond to the arrow or marking of the first indicating portion 16, which is not limited by the present invention.

Please refer to Figures 1 and 2, the adapter 2 has an outer ring 2a and an inner ring 2b. The outer ring 2a rotates in a single direction relative to the inner ring 2b. The outer ring The outer diameter of the member 2a may be slightly larger than the inner diameter of the through hole 12, so that the outer ring member 2a of the adapter 2 can be combined with the through hole 12 in a forced way, so as to lift the adapter 2 and the through hole 12 The bonding stability of the hole 12. The outer circumferential surface of the outer ring member 2a may have a plurality of first tooth-like structures 25, and the inner circumferential surface of the through hole 12 does not match the plurality of first tooth-shaped structures 25, so as to reduce the outer circumference of the outer ring member 2a. The contact area between the surface and the inner peripheral surface of the through hole 12 to facilitate the insertion of the adapter 2 into the through hole 12 and the removal of the adapter 2 from the through hole 12, which has the effect of improving the convenience of use . In this embodiment, the open ends 21 on the upper and lower sides of the outer ring 2a respectively have an inner ring flange 22 to prevent the components in the outer ring 2a from falling out. The inner peripheral surface of the outer ring member 2a may have at least one unidirectional tooth 23, and the at least one unidirectional tooth 23 may protrude toward the center of the outer ring member 2a.

Continuing to refer to Figures 2, 3, and 4, the inner diameter and outer diameter of the inner ring member 2b are variable, and the outer diameter of the inner ring member 2b can be larger than the inner diameter of the inner ring flange 22 of the outer ring member 2a , The inner ring member 2b can be forced into the outer ring member 2a by elastic deformation from any inner ring flange 22, so that the inner ring member 2b can be located between the two inner ring flanges 22. The inner ring member 2b may be a one-way wheel, that is, the outer peripheral surface of the inner ring member 2b may have a plurality of one-way ratchet teeth 24, and the tooth shapes of the plurality of one-way ratchet teeth 24 may be the same. The one-way tooth 23 of the outer ring member 2a can be engaged with one of the plurality of one-way ratchet teeth 24, and the outer ring member 2a can only drive the inner ring member 2b to form a single Direction of rotation. That is, the outer ring member 2a can rotate in a rotation direction by applying force, the at least one one-way tooth 23 can slide through each of the one-way ratchet teeth 24, and when the outer ring member 2a rotates in the opposite direction, the At least one one-way tooth 23 is blocked by the one-way ratchet 24, so that the outer ring member 2a can drive the inner ring member 2b to rotate.

The inner diameter of the inner ring 2b can correspond to the outer diameter of the conventional bone nail assembly T. In detail, the conventional bone nail assembly T has a grabbing head T1 and a screw body T2 that are separable from each other. The grabbing head T1 can be held by the user, or used during surgical operations with tool contact, etc., to avoid direct contact with the screw body T2 and contamination of the screw body T2. The inner ring member 2b The diameter system can match the outer diameter of the grasping head T1, so as long as the adapter 2 with the corresponding inner diameter is replaced, the instrument for orthopedic implants of the present invention can be used for bone nail assemblies of various sizes T. Preferably, the inner peripheral surface of the inner ring member 2b may have a plurality of second tooth-like structures 26 to facilitate the insertion or removal of the bone nail assembly T into the inner ring member 2b and the lifting of the inner ring member The deformability of the inner diameter of 2b enables the inner ring member 2b not only to clamp the grab head T1 with a circular cross-sectional shape, but also to clamp more kinds of grab heads T1 with a cross-sectional shape.

Please refer to Figures 5 and 6, when the device for orthopedic implants of the present invention is used, the inner ring member 2b of the adapter 2 can be sleeved on the bone nail assembly T, and the user can move forward. Rotate the force arm 17 in the direction of the clock to drive the bone nail assembly T to rotate and lock into the bone tissue of the predetermined position. At this time, by the torsion force generated by the user applying force to the force application arm 17, the second extension section 18 of the force application arm 17 can be displaced relative to the first extension section 15 of the measurement arm 14, and From the first indicator portion 16 and the second indicator portion 19, the magnitude of the torque generated by the displacement of the second extension section 18 is known. According to the rigidity of the material of the rod body 1, the first indicator 16 can convert the magnitude of the elastic deformation of the forcing arm 17 into a corresponding scale interval to mark the first indicator 16 or The second indicator 19 allows the user to observe the displacement of the second extension 18 relative to the first extension 15 to rotate the force arm 17 and control the torque within a proper range. And because the outer ring member 2a can only drive the inner ring member 2b to rotate in one direction, the user can alternately rotate the rod body 1 clockwise and counterclockwise to rotate the bone nail assembly T into the bone. The tissue can allow users to perform operations in a limited range, which has the effect of improving the convenience of use. In addition, due to the large number of unidirectional ratchet teeth 24 on the outer peripheral surface of the inner ring member 2b, the tooth shape is the same and is equiangularly distributed, so that the user can fine-tune the bone nail assembly T by rotating the rod body 1 slightly. The degree of closure of the bone tissue to enhance the therapeutic effect.

Please refer to Figure 7, when the screw body T2 of the bone nail assembly T is rotated and locked into the bone tissue, the inner ring member 2b can be separated from the grabbing head T1 of the bone nail assembly T, and only the grabbing head T1 can be disengaged. Take the head T1 exposed on the bone tissue.

Please refer to Figure 8, the user can then take out the grabbing head T1 and separate the grabbing head T1 from the screw body T2 to complete the bone nail implantation operation.

In summary, the orthopedic implant device of the present invention can rotate the rod body by applying force to the force application arm, and the torsion force generated by the force application arm can make the second extension section relative to the first extension section. The extension section is displaced, and the position of the second indicator portion corresponding to the first indicator portion can be used to know the degree of torsion generated by the force arm, so that the user can rotate and lock the bone nail assembly into a predetermined position. , The system can know the magnitude of the torque generated, and can control the torque not to exceed 35Ncm to avoid damage to the bone tissue caused by excessive torque, and further rotate the rod body with the most suitable torque. In addition, the orthopedics of the present invention The instrument for implants measures the torsion force by the elastic deformation of the force arm of the rod body. The rod body can be sterilized at high temperature, and can be applied to bone nail implantation operations, which can reduce the risk of surgery and improve medical treatment. Quality and other effects. On the other hand, the adapter has a small number of components and is easy to assemble. The first tooth structure of the outer ring can improve the convenience of assembly and disassembly between the rod body and the adapter. The inner diameter and outer diameter are variable and have the Several second tooth-like structures can improve the practicability and the convenience of assembly and disassembly between the rod body and the bone nail assembly.

Although the present invention has been disclosed using the above-mentioned preferred embodiments, it is not intended to limit the present invention. Anyone who is familiar with the art without departing from the spirit and scope of the present invention may make various changes and modifications relative to the above-mentioned embodiments. The technical scope of the invention is protected. Therefore, the scope of protection of the invention shall be subject to the scope of the attached patent application.

1: Rod body

11: Joint

12: Through hole

13: Expansion gap

13a: open end

13b: closed end

14: Measuring arm

14a: Frame

14b: opening

14c: Stop block

15: The first extension

16: The first indicator

17: force arm

18: second extension

19: The second instruction section

2: Adapter

2a: Outer ring

2b: inner ring

21: open end

22: inner ring flange

T: Bone nail component

T1: grab head

T2: Screw body

L: axis

Claims (9)

An instrument for orthopedic implants, comprising: a rod body with a coupling part, the coupling part having a through hole, the rod body having a measuring arm and a force arm connected to the coupling part, the measuring arm There is a first extension section, the first extension section has a first indicator portion, the forcing arm has a second extension section, and the second extension section has a second indicator portion, and the forcing arm is elastically deformable away from the Measuring arm, so that the second extension section is displaced relative to the first extension section; and an adapter having an outer ring member and an inner ring member, and the upper and lower sides of the outer ring member have open ends respectively An inner ring flange, the inner diameter and outer diameter of the inner ring member are variable to be inserted between the two inner ring flanges, the outer ring member is coupled to the through hole, and the outer peripheral surface of the outer ring member has several A first tooth-like structure, the inner circumferential surface of the through hole does not match the first tooth-shaped structures to reduce the contact area, the inner circumferential surface of the inner ring member has a plurality of second tooth-shaped structures, the outer ring The member rotates in a single direction relative to the inner ring member. For example, the orthopedic implant device of claim 1, wherein the rod body is made of titanium alloy material. Such as the device for orthopedic implants of claim 2, wherein the titanium alloy is Ti ₆ Al ₄ V. The orthopedic implant device of claim 1, wherein the joint has an expansion gap, an open end of the expansion gap is connected to the through hole, and the expansion gap extends in the joint to form a closed end. The device for orthopedic implants of claim 1, wherein the expansion gap ring extends in a circular shape and extends in the joint portion. The device for orthopedic implants of claim 1, wherein the measuring arm and the forcing arm are not connected to each other and are connected in parallel to the connecting portion. The device for orthopedic implants of claim 1, wherein the measuring arm has a frame, the frame has an opening, and the second extension section extends into the frame from the opening. The device for orthopedic implants of claim 1, wherein the minimum cross-sectional area of the connection between the forcing arm and the joint is less than 50% of the minimum cross-sectional area of the joint. For example, the orthopedic implant device of claim 1, wherein the inner peripheral surface of the outer ring member has at least one unidirectional tooth, and the outer peripheral surface of the inner ring member has a plurality of unidirectional ratchet teeth, so that the outer ring member has only The inner ring can be driven to rotate in a single direction.

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