Broken intramedullary nail taking-out device

Abstract

The broken intramedullary nail taking-out device comprises a nail taking-out tube integrally formed by an internal thread tube section and an expansion tube section, a plurality of openings are formed in the side wall of the expansion tube section, and the expansion tube section is used for being fed into a broken intramedullary nail; the nail taking rod is integrally formed by an external thread rod section and an operation rod section, the external thread rod section is detachably arranged in the internal thread pipe section, and the inner diameter of the internal thread pipe section is larger than that of the expansion pipe section; the thread teeth are formed on the surface of the expansion pipe section, a plurality of arc-shaped battens are formed on the expansion pipe section through a plurality of openings, and the thread teeth are separated by the openings and distributed on the outer wall of each arc-shaped batten in the axial direction of the thread teeth. According to the intramedullary broken nail extractor, the expansion tube section of the nail extraction tube is fed into an intramedullary broken nail, the external threaded rod section of the nail extraction rod is screwed in along the internal threaded tube section of the nail extraction tube, and the expansion tube section is extruded to expand outwards, so that threaded teeth outside the expansion tube section extrude the inner wall of the intramedullary broken nail to be fixed, and the intramedullary broken nail can be taken out conveniently and quickly.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a device for removing broken intramedullary nails. Background Art

[0002] Intramedullary nails are commonly used orthopedic internal fixation devices. The specific structure is the intramedullary nail rod and the locking screw holes set at the proximal and distal ends. Commonly used intramedullary nails are usually hollow intramedullary nail rods. During use, they are prone to breakage (such as improper selection of intramedullary nail specifications, nonunion of fracture sites, improper operation, premature weight bearing, etc.). The proximal end of the broken intramedullary nail can be directly pulled out after removing the locking screw, while the distal part needs to be pulled out with an intramedullary nail removal device.

[0003] At present, the distal broken nail of the intramedullary nail is usually removed clinically by hook-pulling, that is, a steel cable with a barb is inserted into the distal end of the intramedullary nail, and the barb on the steel cable is placed in the screw lock hole of the intramedullary nail, and then multiple Kirschner wires are driven into the interior of the intramedullary nail to compress the steel cable in the intramedullary nail, and then the steel cable is pulled outward to pull out the distal broken nail of the intramedullary nail. However, during the removal process using the hook-pulling removal method, it is necessary to take multiple films and adjust the position of the barb to ensure that the barb is hooked into the screw lock hole, and it is necessary to drive multiple Kirschner wires to squeeze and fix the steel cable, which makes the entire removal process more complicated and difficult to operate, making it difficult to quickly remove the broken nail of the intramedullary nail, resulting in a prolonged operation time.

[0004] Therefore, the existing method of using a barbed wire combined with a Kirschner wire to pressurize and remove a broken intramedullary nail is difficult to quickly remove the broken intramedullary nail, which prolongs the operation time because the barbed wire needs to accurately hook the screw lock hole of the intramedullary nail and multiple Kirschner wires need to be inserted to squeeze and fix the barbed wire. Utility Model Content

[0005] The utility model aims to provide a device for removing a broken intramedullary nail, so as to solve the technical problem in the prior art that the broken intramedullary nail is difficult to remove quickly, resulting in prolonged operation time, because a barbed steel cable needs to be accurately hooked into the screw locking hole of the intramedullary nail and a plurality of Kirschner wires need to be inserted to squeeze and fix the barbed steel cable.

[0006] In order to solve the above technical problems, the utility model specifically provides the following technical solutions:

[0007] A device for removing a broken intramedullary nail, comprising:

[0008] A nail removal tube, the nail removal tube is divided into an integrally formed internal threaded tube section and an expansion tube section, a side wall of the expansion tube section is provided with a plurality of openings parallel to the axis thereof, and the expansion tube section is used for inserting into the broken intramedullary nail;

[0009] A nail removal rod, the nail removal rod is divided into an integrally formed external thread rod section and an operating rod section, the external thread rod section is detachably arranged in the internal thread pipe section, and the inner diameter of the internal thread pipe section is larger than the inner diameter of the expansion pipe section;

[0010] Thread teeth are formed on the surface of the expansion pipe section, the expansion pipe section is formed with a plurality of arcuate strips through the plurality of openings, the thread teeth are separated by the plurality of openings and are distributed on the outer wall of each arcuate strip along the axial direction thereof;

[0011] Wherein, after the operating rod segment rotates the externally threaded rod segment in the internally threaded pipe segment, the externally threaded rod segment enters the expansion pipe segment and squeezes a plurality of arc-shaped strips outward to expand, so that the thread teeth are pressed tightly against the broken intramedullary nail to be fixed.

[0012] As a preferred solution of the utility model, a nut sleeve for being connected and controlled by a drilling tool is arranged on the outer wall of the internally threaded pipe section.

[0013] As a preferred solution of the utility model, the operating rod segment is a bare rod structure, and a handle is rotatably provided on the operating rod segment, and a hexagonal pan head for connection and control by a drilling tool is provided on the end surface of the operating rod segment.

[0014] As a preferred solution of the utility model, the thread teeth include a crest, a front tooth side and a rear tooth side, the front tooth side faces away from the internal thread pipe section, and the rear tooth side faces the internal thread pipe section;

[0015] The connection between the front tooth side and the tooth top is arc-shaped and smoothly transitioned, and the connection between the rear tooth side and the tooth top forms an angle.

[0016] As a preferred solution of the utility model, the end of the expansion pipe section away from the internal thread pipe section forms a concave, and a broken thread is formed on the inner wall of the concave;

[0017] The end of the external threaded rod section away from the operating rod section forms a round end, and a spiral groove is formed on the outer wall of the round end, and the spiral groove can match the broken thread.

[0018] As a preferred solution of the utility model, a plurality of thorn cones surrounding the axis of the expansion tube section are arranged on the outer wall of the concave end of the expansion tube section, and the distance from the tip of the thorn cone to the axis of the expansion tube section is smaller than the radius of the expansion tube section.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model delivers the expansion tube section of the nail removal tube into the interior of the broken nail in the marrow, and screws the external threaded rod section of the nail removal rod along the internal threaded tube section of the nail removal tube, squeezes the expansion tube section to make it expand outward, so that the thread teeth outside the expansion tube section squeeze the inner wall of the broken nail in the marrow to fix it, and the broken nail in the marrow can be removed conveniently and quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0022] Figure 1 A schematic structural diagram of a device for removing a broken intramedullary nail is provided for an embodiment of the utility model;

[0023] Figure 2 A schematic structural diagram of the puncture cone portion of a device for removing a broken intramedullary nail is provided for an embodiment of the utility model.

[0024] The numbers in the figure represent the following:

[0025] 1- Take out the nail tube; 2- Take out the nail rod; 3- Thread teeth;

[0026] 11-internal thread pipe section; 12-expanded pipe section; 21-external thread rod section; 22-operating rod section; 31-tooth top; 32-front tooth side; 33-rear tooth side;

[0027] 111-nut sleeve; 121-opening; 122-arc strip; 123-fracture screw thread; 124-thorn cone; 211-spiral groove; 221-handle; 222-hexagon socket pan head. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] like Figure 1 As shown, the utility model provides a broken intramedullary nail removal device, comprising:

[0030] A nail removal tube 1, which is divided into an integrally formed internal threaded tube section 11 and an expansion tube section 12, a plurality of openings 121 parallel to the axis of the expansion tube section 12 are provided on the side wall of the expansion tube section 12 around the axis of the expansion tube section 12, and the expansion tube section 12 is used to be inserted into the broken intramedullary nail;

[0031] Take the nail rod 2, which is divided into an integrally formed external thread rod section 21 and an operating rod section 22, the external thread rod section 21 is detachably arranged in the internal thread pipe section 11, and the inner diameter of the internal thread pipe section 11 is larger than the inner diameter of the expansion pipe section 12;

[0032] The thread teeth 3 are formed on the surface of the expansion pipe section 12. The expansion pipe section 12 is formed with a plurality of arcuate strips 122 through a plurality of openings 121. The thread teeth 3 are separated by the plurality of openings 121 and are distributed on the outer wall of each arcuate strip 122 along the axial direction thereof.

[0033] After the operating rod section 22 rotates the external threaded rod section 21 in the internal threaded pipe section 11, the external threaded rod section 21 enters the expansion pipe section 12 and squeezes multiple arc strips 122 outward to expand, so that the thread teeth 3 are pressed tightly against the broken intramedullary nail to fix it.

[0034] The removal device of this embodiment mainly places the nail removal tube 1 inside the broken intramedullary nail through an external power tool such as a drill, and then inserts the external threaded rod section 21 of the nail removal rod 2 from the internal threaded tube section 11 of the nail removal tube 1, and connects it with the operating rod section 22 using an external power tool such as a drill, so that the external threaded rod section 21 is gradually screwed into the expansion tube section 12, which can make the multiple arc-shaped strips 122 of the expansion tube section 12 expand outward, so that the threads 3 on the multiple arc-shaped strips 122 are pressed tightly against the inner wall of the intramedullary nail and fixed, and the nail removal tube 1 and the intramedullary nail can be removed from the medullary cavity by pulling out the operating rod section 22.

[0035] After the thread teeth 3 are pressed against the inner wall of the intramedullary nail, the inner wall of the intramedullary nail will be deformed to form grooves, so that when the nail removal tube 1 is pulled out, a greater resistance will be increased between the thread teeth 3 and the inner wall of the intramedullary nail to prevent the nail removal tube 1 from slipping out of the intramedullary nail.

[0036] Compared with the existing method of pulling out by using a barbed steel cable hook, the removal device of this embodiment can place the nail removal tube 1 inside the broken nail of the intramedullary nail through an electric tool such as a drill, and use an electric tool such as a drill to screw the nail removal rod 2 into the nail removal tube 1, so that the external threaded rod section 21 squeezes the expansion tube section 12, so that the thread teeth 3 are tightly pressed against the inner wall of the intramedullary nail, ensuring that the removal tube 1 and the intramedullary nail are firmly fixed, thereby facilitating the nail removal rod 2 to quickly pull out the nail removal tube 1 and the intramedullary nail from the medullary cavity.

[0037] Since the internal threaded pipe section 11 needs to be sent into the broken nail of the intramedullary nail, it can save more manpower by using electric tools such as drilling tools. Figure 1 As shown, a nut sleeve 111 for being connected and controlled by a drilling tool is provided on the outer wall of the internal threaded pipe section 11 .

[0038] A nut sleeve 111 is arranged on the outer wall of the internal threaded pipe section 11 , and the nut sleeve 111 can be conveniently connected to an electric tool such as a drill, so that the nail removal tube 1 is easily inserted into the broken nail of the intramedullary nail.

[0039] Similarly, since the nail removal rod 2 needs to be screwed into the nail removal tube 1, screwing the nail removal rod 2 into the nail removal tube 1 by means of an electric tool such as a drill can save more manpower. Figure 1 As shown, the operating rod section 22 is a bare rod structure, and a handle 221 is rotatably provided on the operating rod section 22 , and a hexagonal socket head 222 for being connected and controlled by a drilling tool is provided on the end surface of the operating rod section 22 .

[0040] The handle 221 can keep the nail removal rod 2 from deflecting when the nail removal rod 2 is screwed into the nail removal tube 1 , and the handle 221 does not affect the screwing of the nail removal rod 2 .

[0041] The hexagonal inner head 222 can facilitate the assembly and connection of electric tools such as drilling tools.

[0042] After the arc strip 122 expands outward, the thread teeth 3 can be pressed against the inner wall of the broken nail of the intramedullary nail and form a groove on the inner wall of the broken nail, and the cooperation between the thread teeth 3 and the groove can provide greater resistance. Therefore, in order to further improve the resistance formed by the thread teeth 3 after being pressed and fixed, the following preferred embodiments are provided.

[0043] like Figure 1 As shown, the thread 3 includes a crest 31, a front flank 32 and a rear flank 33, the front flank 32 faces away from the internal thread pipe section 11, and the rear flank 33 faces toward the internal thread pipe section 11;

[0044] The connection between the front tooth side 32 and the tooth top 31 is in an arc shape and smoothly transitions, and the connection between the rear tooth side 33 and the tooth top 31 forms an angle.

[0045] Specifically, the connection between the front tooth side 32 and the tooth top 31 is smoothly arc-shaped, thereby reducing the screwing resistance of the expansion tube section 12 of the nail removal tube 1 into the broken nail, and the connection between the rear tooth side 33 and the tooth top 31 forms an edge, so that the thread tooth 3 is pressed tightly against the inner wall of the broken nail, forcing the inner wall of the broken nail to form a groove, thereby increasing the resistance of the nail removal tube 1 to axial outward movement.

[0046] And because the connection between the front tooth side 32 and the tooth top 31 is a smooth arc transition, during the extrusion process, the surface of the front tooth side 32 is bent toward the back tooth side 33 by the reaction force, so that the thread tooth 3 is hooked in the groove formed on the inner wall of the broken nail along the axial outward movement direction of the nail removal tube 1, thereby further preventing the nail removal tube 1 and the broken nail of the intramedullary nail from slipping during the removal process.

[0047] During the process of pulling the nail removal rod 2 out of the nail removal tube 1, the axial resistance between the nail removal rod 2 and the nail removal tube 1 is mainly provided through the axial locking resistance between the internal threaded tube section 11 and the external threaded rod section 21, and the extrusion friction between the external threaded rod section 21 and the expansion tube section 12, so as to prevent the nail removal rod 2 and the nail removal tube 1 from slipping off.

[0048] Therefore, in order to further improve the axial resistance between the nail removal rod 2 and the nail removal tube 1 to ensure the reliability of extraction, the following preferred embodiments are provided.

[0049] like Figure 1 and Figure 2 As shown, the end of the expansion pipe section 12 away from the internal thread pipe section 11 forms a concave, and a broken thread 123 is formed on the inner wall of the concave;

[0050] The end of the external threaded rod section 21 away from the operating rod section 22 forms a round end, and a spiral groove 211 is formed on the outer wall of the round end, and the spiral groove 211 can match the broken thread 123.

[0051] Specifically, the broken thread 123 at the concave end of the expansion tube segment 12 can match the spiral groove 211 at the round end of the externally threaded rod segment 21. After the externally threaded rod segment 21 passes through the expansion tube segment 12, the broken thread 123 and the spiral groove 211 are threadedly matched and interlocked in the axial direction, thereby further preventing the nail removal rod 2 and the nail removal tube 1 from sliding.

[0052] The broken nail of the intramedullary nail is mainly fixed to the nail removal tube 1 by the thread teeth 3 and the inner wall of the broken nail. When the pull-out resistance of the intramedullary nail in the medullary cavity increases (such as the situation where the intramedullary nail is slightly bent after breaking and the resistance between the broken nail and the inner wall of the medullary cavity increases, etc.), the thread teeth 3 and the inner wall of the broken nail may still slip.

[0053] Therefore, in order to further improve the axial resistance between the nail removal tube 1 and the broken nail, the following preferred embodiments are provided.

[0054] like Figure 1 and Figure 2 As shown, a plurality of thorn cones 124 surrounding the axis of the expansion tube segment 12 are arranged on the outer wall of the concave end of the expansion tube segment 12 , and the distance from the tip of the thorn cone 124 to the axis of the expansion tube segment 12 is less than the radius of the expansion tube segment 12 .

[0055] Specifically, the expansion tube section 12 can be extended into the broken nail, so that the thorn cone 123 on the outer wall of the concave end of the expansion tube section 12 is located at the screw locking hole of the intramedullary nail. After the external threaded rod section 21 of the nail removal rod 2 squeezes the expansion tube section 12, the thorn cone 124 moves outward and penetrates into the screw locking hole of the intramedullary nail (the thorn cone 124 that is not aligned with the screw locking hole penetrates into the inner wall of the broken nail), thereby further increasing the axial resistance between the nail removal tube 1 and the broken nail and reducing the probability of slippage between the nail removal tube 1 and the broken nail.

[0056] Of course, the hardness of the spike 124 and the hardness of the thread 3 are higher than the hardness of the intramedullary nail, so that the spike 124 can easily penetrate the inner wall of the broken nail and the thread 3 can easily form grooves on the inner wall of the broken nail.

[0057] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A broken intramedullary nail removal device, characterized in that: include: A nail removal tube (1), the nail removal tube (1) being divided into an integrally formed internally threaded tube section (11) and an expansion tube section (12), a plurality of openings (121) being arranged on the side wall of the expansion tube section (12) around its axis and parallel to its axis, the expansion tube section (12) being used for inserting into the interior of a broken intramedullary nail; A nail removal rod (2), the nail removal rod (2) being divided into an integrally formed externally threaded rod section (21) and an operating rod section (22), the externally threaded rod section (21) being detachably arranged in the internally threaded pipe section (11), and the inner diameter of the internally threaded pipe section (11) being larger than the inner diameter of the expansion pipe section (12); A thread (3) is formed on the surface of the expansion tube section (12); the expansion tube section (12) is formed with a plurality of arcuate strips (122) through a plurality of the openings (121); the thread (3) is separated by the plurality of openings (121) and distributed along the axial direction on the outer wall of each of the arcuate strips (122); Wherein, after the operating rod section (22) rotates the externally threaded rod section (21) in the internally threaded pipe section (11), the externally threaded rod section (21) enters the expansion pipe section (12) and squeezes a plurality of arc-shaped strips (122) outward to expand, so that the thread teeth (3) are pressed tightly against the inside of the broken intramedullary nail to be fixed.

2. The broken intramedullary nail removal device according to claim 1, characterized in that: The outer wall of the internally threaded pipe section (11) is provided with a nut sleeve (111) for being connected and controlled by a drilling tool.

3. The broken intramedullary nail removal device according to claim 1, characterized in that: The operating rod section (22) is a bare rod structure, and a handle (221) is rotatably provided on the operating rod section (22), and a hexagonal socket head (222) for being connected and controlled by a drilling tool is provided on the end surface of the operating rod section (22).

4. A broken intramedullary nail removal device according to any one of claims 1 to 3, characterized in that: The thread (3) comprises a crest (31), a front flank (32) and a rear flank (33), wherein the front flank (32) faces away from the internal thread pipe section (11), and the rear flank (33) faces toward the internal thread pipe section (11); The connection between the front tooth side (32) and the tooth top (31) is in an arc-shaped smooth transition, and the connection between the rear tooth side (33) and the tooth top (31) forms an angular shape.

5. A broken intramedullary nail removal device according to any one of claims 1 to 3, characterized in that: The end of the expansion pipe section (12) away from the internally threaded pipe section (11) is formed inwardly concave, and a broken thread (123) is formed on the inner wall of the concave; The end of the external threaded rod section (21) away from the operating rod section (22) forms a round end, and a spiral groove (211) is formed on the outer wall of the round end, and the spiral groove (211) can match the broken thread (123).

6. The broken intramedullary nail removal device according to claim 5, characterized in that: A plurality of thorn cones (124) surrounding the axis of the expansion tube section (12) are arranged on the outer wall of the concave end portion thereof, and the distance between the tip of the thorn cone (124) and the axis of the expansion tube section (12) is smaller than the radius of the expansion tube section (12).

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