TW202220621A - Tool for bone implant - Google Patents

Abstract

A tool for bone implant is presented 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 present invention relates to a surgical instrument, in particular to an orthopaedic implant instrument for performing a bone nail implantation operation.

In the treatment of bone damage caused by external force, disease or degeneration, bone nails can be implanted in the damaged bone to improve bone strength, or fix the bone to facilitate healing. Generally speaking, during bone screw implantation, a surgical tool similar to a screwdriver is used to rotate the bone screw into the bone. When the bone screw is screwed into the bone, the bone tissue will be squeezed. According to the publications and discussions on bone injury at home and abroad, it can be seen that when the stress is too large, it will cause osteonecrosis (Osteonecrosis), and the appropriate stress will increase the growth rate of the bone tissue. The stress of squeezing the bone tissue can be controlled by controlling the rotational torque of the bone nail. However, the conventional instruments used to measure the torque are precision machinery and cannot be sterilized and are suitable for bone nail implantation operations. The current surgical tools do not allow the operator to know the torque of each manipulation of the rotation, so it is easy to cause the operator to exert too much force and adversely affect the bone tissue.

In view of this, it is true that the conventional surgical tools still need to be improved.

In order to solve the above problems, the object of the present invention is to provide an orthopaedic implant device, which can know the torsion force when rotating the bone nail.

Another object of the present invention is to provide a device for orthopedic implants, which can be sterilized at high temperature.

The directional or similar terms used throughout this disclosure, such as "front", "back", "left", "right", "top (top)", "bottom (bottom)", "inside", "outside" , "side surface", etc., mainly refer to the directions of the attached drawings, each directionality or its similar terms are only used to assist the description and understanding of the various embodiments of the present invention, and are not intended to limit the present invention.

The use of the quantifier "a" or "an" for the elements and components described throughout the present invention is only for convenience and provides a 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 a single The concept of also includes the plural case unless it is obvious that it means otherwise.

Similar terms such as "combined", "combined" or "assembled" mentioned in the whole text of the present invention mainly include the components that can be separated without destroying the components after the connection, or the components can not be separated after being connected, which are common knowledge in the field. It can be selected according to the material of the components to be connected or the assembly requirements.

The instrument for orthopedic implants of the present invention comprises: a rod body with a joint part, the joint part has a through hole, the rod body has a measuring arm and a force application arm connected to the joint part, the measuring arm The measuring arm has a first extension section, the first extension section has a first indication portion, the force application arm has a second extension section, the second extension section has a second indication portion, and the force application arm can be elastically deformed away from the measuring arm, so that the second extension section is displaced relative to the first extension section; and an adapter, coupled to the through hole, the adapter has an outer ring and an inner ring, The outer ring member rotates in a single direction relative to the inner ring member.

Accordingly, the orthopaedic implant device of the present invention can rotate the rod body by applying force to the force-applying arm, and the torsion force generated by the force-applying arm can make the second extension section relative to the first extension section Displacement is formed, and the degree of torsion force generated by the force application arm can be known from the position of the second indicator portion corresponding to the first indicator portion. The magnitude of the generated torque can be known, and the torque can be controlled not to exceed 35Ncm, so as to avoid the destruction of the bone tissue caused by the excessive torque, and further rotate the rod body with the optimal torque. In addition, the orthopaedic implant of the present invention The material-use instrument measures the torsion force by the elastic deformation of the force-applying arm of the rod body, so that the rod body can be sterilized at high temperature, and can be suitable for bone nail implantation surgery, which can reduce the surgical risk and improve the medical quality. and other effects.

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 extent, 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 rigid to a certain extent, 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 through hole can be slightly enlarged in diameter, so that the through hole can be sleeved on the adapter with a larger diameter, which has the effect of improving the combination stability of the through hole and the adapter.

Wherein, the expansion gap can be encircled and extended in the joint portion in a circular shape. 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 measurement arm and the force application arm are not connected to each other and are connected to the joint portion in parallel. In this way, the connection between the force-applying arm and the joint portion is a fulcrum, so that the force-applying arm can be elastically deformed away from the measuring arm, which has the effect of measuring the torsion of the force-applying arm.

Wherein, the measuring arm may have a frame body, the frame body has an opening, and the second extension section extends into the frame body 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 force applying arm.

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

Wherein, the outer peripheral surface of the outer ring member or/and the inner peripheral surface of the inner ring member may be in the shape of teeth. In this way, the contact area between the outer ring member and the through hole, or the contact area between the inner ring member and the bone nail assembly can be reduced, which has the effect of facilitating the installation and removal of the adapter and the bone nail assembly.

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 unidirectional tooth. rotate. 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 where the rotation range is limited. It has the effect of improving the convenience of use.

In order to make the above-mentioned and other objects, features and advantages of the present invention more obvious and easy to understand, the preferred embodiments of the present invention are exemplified below, and are described in detail as follows in conjunction with the accompanying drawings:

Please refer to Figures 1 and 2, which is an embodiment of the orthopaedic implant device of the present invention, which includes a rod body 1 and an adapter 2, the adapter 2 is combined with the rod body 1, In addition, the adapter 2 can be combined with a conventional bone fixation component T. As shown in FIG.

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 can be made of stainless steel, preferably It can be made of titanium alloy material. In this embodiment, the rod body 1 is made of Ti ₆ Al ₄ V. The rod body 1 has a joint portion 11, the joint portion 11 has a through hole 12, the through hole 12 can accommodate the aforementioned adapter 2, the geometric center of the through hole 12 can have an axis L, so that the rod body 1 can be rotated around the axis L, and the joint 11 is preferably located at one end of the rod body 1, so that the user can apply force from the other end of the rod body 1 with a longer lever arm, which has Effort-saving effect. In this embodiment, the joint portion 11 may have an expansion gap 13 , the expansion gap 13 penetrates two opposite surfaces of the joint portion 11 , an open end 13 a of the expansion gap 13 is connected to the through hole 12 , and the expansion gap 13 The gap 13 extends in the joint portion 11 to form a closed end 13b, so that the expansion 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 combination stability with the adapter 2 . In addition, the expansion gap 13 is preferably encircled in a circular shape and extends in the joint portion 11 to increase the extension length of the expansion gap 13 , thus, it has the effect of evenly dispersing the stress generated by the diameter expansion of the through hole 12 .

Continuing to refer to FIGS. 1 and 3 , the rod body 1 has a measuring arm 14 , and one end of the measuring arm 14 is preferably connected to the joint portion 11 in an integral manner. The measuring arm 14 has a first extending section 15 , the first extending section 15 protrudes from one side of the measuring arm 14 , when the rod body 1 rotates about the axis L, a virtual circumferential direction D can be formed. The first extension section 15 may extend in the circumferential direction D. As shown in FIG. In this embodiment, the measuring arm 14 has a frame body 14a, the frame body 14a can be rectangular and has an opening 14b, and the first extension section 15 can be located on one of the long sides of the frame body 14a. The first extension section 15 has a first indication portion 16 , and the first indication portion 16 can be used to display the rotational torque of the rod body 1 . For example, the first indication portion 16 can be color blocks of different colors, gradient The layer color, or the digital scale, is not limited in the present invention. In this embodiment, the first indication portion 16 is a scale group to provide the most direct information to the user.

The rod body 1 has a force-applying arm 17 . One end of the force-applying arm 17 is preferably connected to the joint portion 11 in an integral manner, and the force-applying arm 17 and the measuring arm 14 preferably extend side by side without being connected to each other. form. The connection between the force application arm 17 and the joint portion 11 can be used as a fulcrum, so that the force application arm 17 can be elastically deformed away from the measurement arm 14 . In this embodiment, the connection between the force application arm 17 and the joint portion 11 The minimum cross-sectional area of 11 is preferably less than 50% of the minimum cross-sectional area of the joint portion 11, so that the force-applying arm 17 can be easily elastically deformed at the fulcrum. The force-applying 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 moves 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 extending section 18 can extend into the frame body 14a through the opening 14b.

The second extending section 18 has a second indicating portion 19. The second indicating portion 19 is located opposite to the first indicating portion 16, so that the second indicating portion 19 can be used to display the rotational torque of the rod body 1. In addition, the second indication portion 19 may have an indication mark corresponding to the first indication portion 16. For example, the second indication portion 19 may be an arrow or a reticle to indicate color blocks, gradient colors, or Digital scale. In this embodiment, the second indicating portion 19 may be a triangular protrusion protruding from one side edge of the second extending section 18 , and the opening 14b of the frame body 14a may have a stopper 14c , which stops the The block 14c can stop the second indicating part 19, so the first indicating part 16 can be set to a predetermined value at the blocking block 14c, and the predetermined value can be a torque limit value. When the indicator portion 19 abuts against the stopper 14c, the user can be reminded that the rotational torque of the rod body 1 is too large, which has the effect of reducing the operation error of the user. In addition, the second indication portion 19 may also be a color block, a gradient color, or a digital scale to correspond to the arrow or the marking line of the first indication portion 16 , which is not limited in the present invention.

Referring 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 piece 2a can be slightly larger than the inner diameter of the through hole 12, so that the adapter 2 can be combined with the through hole 12 in a forced manner, so as to improve the stability of the combination of the adapter 2 and the through hole 12. sex. The outer peripheral surface of the outer ring member 2a can be toothed to reduce the contact area with the inner peripheral surface of the through hole 12, so as 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. The through hole 12 is taken out to improve the convenience of use. In this embodiment, the open ends 21 on the upper and lower sides of the outer ring member 2a respectively have an inner ring flange 22 to prevent the components in the outer ring member 2a from coming out. The inner peripheral surface of the outer ring member 2a may have at least one one-way tooth 23, and the at least one one-way tooth 23 may protrude toward the center of the outer ring member 2a.

Continuing to refer to Figures 3 and 4, the inner ring member 2b may 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 Several one-way ratchet teeth 24 enable the outer ring member 2a to only drive the inner ring member 2b to rotate in a single direction. That is, the outer ring member 2a can be rotated 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 is rotated 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 member 2b can correspond to the outer diameter of the conventional bone nail assembly T. Specifically, the conventional bone nail assembly T has a grasping head T1 and a screw body T2 that can be separated from each other. The grabbing head T1 can be held by the user, or used for surgical operations such as tool contact, so as to avoid direct contact with the screw body T2 and contamination of the screw body T2. The diameter system can match the outer diameter of the grasping head T1, so that the orthopaedic implant instrument of the present invention can be used for various sizes of bone nail assemblies as long as the adapter 2 with the corresponding inner diameter is replaced. T. Preferably, the inner peripheral surface of the inner ring member 2b may be in the shape of teeth, so as to facilitate the insertion of the bone nail assembly T into the inner ring member 2b.

Referring to Figures 5 and 6, when the orthopaedic implant device 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 The force application arm 17 is rotated in the direction of the clock to drive the bone nail assembly T to be rotated and locked into the bone tissue of the predetermined position. At this time, by the torsion force generated by the user applying force to the force-applying arm 17, the second extension section 18 of the force-applying arm 17 can be displaced relative to the first extension section 15 of the measuring arm 14, and the The magnitude of the torsion force generated by the displacement of the second extending section 18 can be known from the first indicating portion 16 and the second indicating portion 19 . According to the rigidity of the material of the rod body 1, the first indicating portion 16 can convert the elastic deformation amplitude of the force-applying arm 17 into a corresponding scale interval, so as to be indicated on the first indicating portion 16 or the second indicating portion 19, In this way, the user can rotate the force applying arm 17 and control the torque within an appropriate range while observing the displacement of the second extension section 18 relative to the first extension section 15 . And because the outer ring member 2a can only drive the inner ring member 2b to rotate in one direction, the user can make the rod body 1 rotate clockwise and counterclockwise alternately, so as to rotate and lock the bone screw assembly T into the bone. Tissue, which allows users to perform surgery within a limited range, has the effect of improving the convenience of use.

Referring to Fig. 7, after the screw body T2 of the bone nail assembly T is rotated and locked into the bone tissue, the inner ring 2b can be disengaged from the grasping head T1 of the bone nail assembly T, and only the grasping head T1 of the bone nail assembly T can be disengaged. The head T1 was exposed on the bone tissue.

Referring to FIG. 8 , the user can take out the grabbing head T1 again to separate the grabbing head T1 from the screw body T2 to complete the bone screw implantation operation.

To sum up, the device for orthopaedic implant of the present invention can rotate the rod body by applying force to the force-applying arm, and the torsion force generated by the force-applying arm can make the second extension section relative to the first The extension segment forms a displacement, and the degree of torsion generated by the force application arm can be known from the position of the second indicator portion corresponding to the first indicator portion, whereby 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, so as to avoid the destruction of bone tissue caused by excessive torque, and further rotate the rod body with the optimum torque. The instrument for implants measures the torque by the elastic deformation of the force arm of the rod body. The rod body can be sterilized at high temperature, and can be suitable for bone nail implantation surgery, which can reduce the risk of surgery and improve medical treatment. quality and other effects.

Although the present invention has been disclosed by the above-mentioned preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various changes and modifications relative to the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the patent application attached hereto.

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 instruction department 17: Force Arm 18: Second extension 19: Second Instruction Department 2: Adapter 2a: Outer ring 2b: inner ring 22: Inner ring flange 23: One-way tooth 24: One-way ratchet T: Bone Nail Assembly T1: Grab head T2: Screw body L: axis D: Circumferential direction

[FIG. 1] An exploded perspective view of an embodiment of the present invention. [Fig. 2] An exploded perspective view of the adapter of the present invention. [FIG. 3] A combined view of an embodiment of the present invention. [FIG. 4] A cross-sectional view taken along line A-A in FIG. 3. FIG. [FIG. 5] A schematic diagram of the action of rotating the rod body according to an embodiment of the present invention. [FIG. 6] A use situation diagram of the rotating bone screw assembly locked into the bone tissue according to an embodiment of the present invention. [Fig. 7] A schematic diagram showing the separation of an embodiment of the present invention and the bone nail assembly after the bone nail assembly is locked in. [Picture 8] Schematic diagram of removing the grasping head of the bone nail assembly.

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 instruction department

17: Force Arm

18: Second extension

19: Second Instruction Department

2: Adapter

2a: Outer ring

2b: inner ring

21: Open end

22: Inner ring flange

T: Bone Nail Assembly

T1: Grab head

T2: Screw body

L: axis

Claims (10)

An instrument for orthopaedic implants, comprising: a rod body has a joint part, the joint part has a through hole, the rod body has a measuring arm and a force arm connected to the joint part, the measuring arm has a first extension section, the first The extension section has a first indication portion, the force-applying arm has a second extension section, the second extension section has a second indication portion, the force-applying arm can be elastically deformed away from the measuring arm, so that the second extension the segment is displaced relative to the first extension; and An adapter is combined with the through hole, the adapter has an outer ring and an inner ring, and the outer ring rotates in a single direction relative to the inner ring. The device for orthopaedic implant according to claim 1, wherein the rod body is made of titanium alloy material. The orthopaedic implant device according to claim 2, wherein the titanium alloy is Ti ₆ Al ₄ V. The orthopaedic implant device of claim 1, wherein the joint portion 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 portion to form a closed end. The orthopaedic implant device according to claim 1, wherein the expansion gap circle extends in the joint portion in a circular shape. The orthopaedic implant device according to claim 1, wherein the measuring arm and the force applying arm are not connected to each other and are connected to the joint portion in parallel. The orthopaedic implant device of claim 1, wherein the measuring arm has a frame, the frame has an opening, and the second extension extends into the frame through the opening. The orthopaedic implant device according to claim 1, wherein the minimum cross-sectional area of the connection between the force applying arm and the joint portion is less than 50% of the minimum cross-sectional area of the joint portion. The orthopaedic implant device according to claim 1, wherein the outer peripheral surface of the outer ring member or/and the inner peripheral surface of the inner ring member are tooth-shaped. The orthopaedic implant device of claim 1, wherein the inner peripheral surface of the outer ring member has at least one one-way tooth, and the outer peripheral surface of the inner ring member has a plurality of one-way ratchet teeth, so that the outer ring member has only one unidirectional tooth. The inner ring can be driven to rotate in a single direction.

Images