CN115645122B

CN115645122B - Expandable prosthesis extractor

Info

Publication number: CN115645122B
Application number: CN202211569451.8A
Authority: CN
Inventors: 李帅垒; 王亚松; 张帅
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2022-12-08
Filing date: 2022-12-08
Publication date: 2023-04-07
Anticipated expiration: 2042-12-08
Also published as: CN115645122A

Abstract

The present invention provides an expandable prosthesis extractor, comprising: the sleeve is provided with a first inner hole which penetrates through the sleeve along the axis of the sleeve; the clamping device comprises a sleeve, a plurality of clamping jaws, a clamping mechanism and a clamping mechanism, wherein the clamping jaws are arranged at a first end of the sleeve along the circumferential direction of the sleeve, two adjacent clamping jaws are arranged at intervals, each clamping jaw comprises a first end connected with the sleeve and a second end far away from the sleeve, a clamping bulge is arranged on the outer wall of the second end of each clamping jaw, and each clamping jaw is provided with a recovery position enabling the clamping bulge to be recovered and an extending position enabling the clamping bulge to extend outwards; the movable rod is movably arranged in the first inner hole in a penetrating way and is in driving fit with the clamping jaws; the driving rod is arranged in the first inner hole and located above the movable rod, and the driving rod drives the movable rod to move along the first inner hole so as to drive the clamping jaw to be switched to the extending position from the recovering position. Through the technical scheme provided by the application, the problem that the difficulty in taking out the prosthesis in the related technology is high can be solved.

Description

Expandable prosthesis extractor

Technical Field

The invention relates to the technical field of medical instruments, in particular to an expandable prosthesis extractor.

Background

The knee joint is an important joint of the human body, and the human body can run or jump through the movement of the knee joint. When the tibia of a patient has bone defects, special prosthesis is needed to repair the tibia, so that the knee joint prosthesis is ensured to be firmly and reliably installed.

However, after the knee joint replacement, if the knee joint has symptoms such as looseness, infection, pain or limited flexion and extension functions, the trajectory of the patella is not correct, the bone defect is further aggravated, the prosthesis sinks, and the like, and the knee joint needs to be rebuilt again, and at this time, the prosthesis also needs to be taken out together.

However, because the prosthesis has a truncated cone-shaped structure with a large upper end and a small lower end, the outer wall surface of the prosthesis is tightly attached to the tibia. The existing prosthesis extraction tool is difficult to attach to the prosthesis, so that the prosthesis extraction difficulty is high.

Disclosure of Invention

The invention provides an expandable prosthesis extractor, which aims to solve the problem of great difficulty in extracting a prosthesis in the related art.

The present invention provides an expandable prosthesis extractor, comprising: the sleeve is provided with a first inner hole which penetrates through the sleeve along the axis of the sleeve; the clamping device comprises a sleeve, a plurality of clamping jaws, a clamping sleeve and a clamping mechanism, wherein the clamping jaws are arranged at the first end of the sleeve along the circumferential direction of the sleeve, two adjacent clamping jaws are arranged at intervals, each clamping jaw comprises a first end connected with the sleeve and a second end far away from the sleeve, a clamping bulge is arranged on the outer wall of the second end of each clamping jaw, and each clamping jaw is provided with a recovery position enabling the clamping bulge to be recovered and an extension position enabling the clamping bulge to extend outwards; the movable rod is movably arranged in the first inner hole in a penetrating mode and is in driving fit with the clamping jaws; the driving rod is arranged in the first inner hole and located above the movable rod, and the driving rod drives the movable rod to move along the first inner hole so as to drive the clamping jaw to be switched to the extending position from the recovering position.

Further, when a plurality of jack catchs were located the recovery position, the bell mouth was injectd to the inner wall of a plurality of jack catchs, and the second end of movable rod is provided with toper boss, and in the direction of telescopic first end directional its second end, the size of bell mouth and toper boss all increases gradually, and toper boss can remove in the bell mouth to the drive jack catch is by retrieving the position and switching to the extended position.

Furthermore, the driving rod is rotatably arranged in the first inner hole, a threaded hole is formed in one of the driving rod and the movable rod, a first external thread is arranged on the side wall of the other one of the driving rod and the movable rod, the threaded hole and the first external thread are both located above the conical boss, and the first external thread is inserted into the threaded hole.

Furthermore, the side wall of the conical boss is provided with a plurality of anti-rotation ribs which are arranged at intervals and extend along the axial direction of the conical boss, and each anti-rotation rib is located between two adjacent clamping jaws.

Furthermore, an annular boss is arranged on the inner wall of the first inner hole, and the end wall of the second end of the driving rod is abutted to the annular boss.

Further, the first ends of the clamping jaws are fixedly connected with the sleeve, and a gap is formed between every two adjacent clamping jaws.

Furthermore, a plurality of crack-stopping holes communicated with the first inner hole are further formed in the side wall of the second end of the sleeve, each crack-stopping hole is communicated with the corresponding gap one by one, and the diameter of each crack-stopping hole is larger than the size of each gap.

Furthermore, the expandable prosthesis extractor further comprises a recovery sleeve, the recovery sleeve is provided with a second inner hole which penetrates through the recovery sleeve, the sleeve is movably arranged in the second inner hole in a penetrating mode, and the recovery sleeve can drive the clamping jaws to be switched to a recovery position from the extending position.

Further, a second external thread is arranged on the outer side wall of the sleeve, the second inner hole is provided with an internal thread, and the internal thread is connected with the second external thread so that the sleeve can rotate and can move along the axial direction of the sleeve.

Further, an operation part is arranged at the first end of the recovery sleeve; and/or the second end of the sleeve is provided with a rotation stopping part, and the sleeve is kept static through the rotation stopping part in the process of moving the recovery sleeve.

When the expandable prosthesis extractor is used for extracting a prosthesis, the movable rod and the driving rod are arranged in the first inner hole of the sleeve, the driving rod is located above the movable rod, the movable rod extends into the hole of the prosthesis, the driving rod is used for driving the movable rod to move along the first inner hole, so that the jaw is switched from the recovery position where the clamping bulge is recovered to the extending position where the clamping bulge extends outwards, the clamping bulge on the jaw can be abutted to the prosthesis to drive the prosthesis to move, and the sleeve is extracted in the direction far away from the human body, so that the prosthesis can be extracted out of the human body by using the jaw.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 illustrates a cross-sectional view of an expandable prosthesis extractor provided in accordance with an embodiment of the present invention;

FIG. 2 shows a schematic view of the construction of the sleeve of FIG. 1;

FIG. 3 shows a cross-sectional view of the socket and jaws of FIG. 1;

FIG. 4 shows a schematic view of the movable bar of FIG. 1;

FIG. 5 shows a schematic structural view of the recovery boot of FIG. 1;

FIG. 6 shows a cross-sectional view of the recovery boot of FIG. 1;

fig. 7 shows a sectional view of the drive rod of fig. 1.

Wherein the figures include the following reference numerals:

10. a sleeve; 11. a first inner bore; 111. an annular boss; 12. a crack stop hole; 13. a second external thread; 14. a rotation stop section;

20. a jaw; 21. clamping the bulges; 22. a tapered hole; 23. a gap;

30. a movable rod; 31. a conical boss; 311. preventing the ribs from rotating; 32. a first external thread;

40. a drive rod; 41. a threaded hole;

50. recovering the sleeve; 51. a second inner bore; 52. an internal thread; 53. an operation unit.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

As shown in fig. 1 to 7, an embodiment of the present invention provides an expandable prosthesis extractor including a sleeve 10, a plurality of jaws 20, a movable rod 30, and a driving rod 40, the sleeve 10 having a first inner hole 11 disposed therethrough along an axis thereof; the clamping device comprises a sleeve 10, a plurality of clamping jaws 20, a clamping head and a clamping device, wherein the clamping jaws 20 are arranged at the first end of the sleeve 10 along the circumferential direction of the sleeve 10, two adjacent clamping jaws 20 are arranged at intervals, each clamping jaw 20 comprises a first end connected with the sleeve 10 and a second end far away from the sleeve 10, a clamping bulge 21 is arranged on the outer wall of the second end of each clamping jaw 20, and each clamping jaw 20 is provided with a recovery position enabling the clamping bulge 21 to be recovered and an extending position enabling the clamping bulge 21 to extend outwards; the movable rod 30 is movably arranged in the first inner hole 11 in a penetrating way and is matched with the claws 20 in a driving way; the driving rod 40 is disposed in the first inner hole 11 above the movable rod 30, and the driving rod 40 drives the movable rod 30 to move along the first inner hole 11 to drive the jaw 20 to switch from the retracted position to the extended position.

By applying the technical scheme of the invention, the expandable prosthesis extractor comprises a sleeve 10, a plurality of clamping jaws 20, a movable rod 30 and a driving rod 40, when the expandable prosthesis extractor is used for extracting a prosthesis, the movable rod 30 and the driving rod 40 are both arranged in a first inner hole 11 of the sleeve 10, the driving rod 40 is positioned above the movable rod 30, the movable rod 30 is simultaneously extended into a hole of the prosthesis, the driving rod 40 is utilized to drive the movable rod 30 to move along the first inner hole 11, so that the recovery position of the clamping jaws 20 recovered from the clamping protrusions 21 is switched to the extension position of the clamping protrusions 21 extending outwards, the clamping protrusions 21 on the clamping jaws 20 can be abutted against the prosthesis to drive the prosthesis to move, and the sleeve 10 is extracted towards the direction far away from a human body, so that the prosthesis can be extracted from the human body by the clamping jaws 20.

The jaws 20 may be fixedly connected to the sleeve 10, or the jaws 20 may be hinged to the sleeve 10, as long as when the jaws 20 are located at the extending position, the clamping protrusions 21 can form a close fit with the prosthesis to drive the prosthesis to move.

It should be noted that the driving engagement of the movable rod 30 and the plurality of jaws 20 may include a plurality of driving engagement manners, for example, the movable rod 30 drives the plurality of jaws 20 to switch from the retracted position to the extended position through a tapered structure, or an articulated rod is disposed between the movable rod 30 and the jaws 20, two ends of the articulated rod are respectively in articulated connection with the movable rod 30 and the jaws 20, and the jaws 20 switch from the retracted position to the extended position during the movement of the movable rod 30.

Specifically, the driving lever 40 is located above the movable lever 30, meaning that a portion of the driving lever 40 is located above the movable lever 30, and there may be an overlapping portion therebetween to form a connection structure.

As shown in fig. 3 and 4, when the plurality of jaws 20 are located at the withdrawing position, the inner walls of the plurality of jaws 20 define a tapered hole 22, the second end of the movable rod 30 is provided with a tapered boss 31, the tapered hole 22 and the tapered boss 31 are gradually increased in size in a direction in which the first end of the sleeve 10 is directed to the second end thereof, and the tapered boss 31 can move in the tapered hole 22 to drive the jaws 20 to be switched from the withdrawing position to the extending position. The driving structure that the conical boss 31 is matched with the conical hole 22 has the advantages of simple structure and reliability.

In the present embodiment, when the tapered boss 31 moves in the tapered hole 22, the tapered hole 22 can be deformed, so that the pawl 20 can be switched from the retracted position to the extended position.

As shown in fig. 1, 4 and 7, the driving rod 40 is rotatably disposed in the first inner hole 11, a threaded hole 41 is disposed on one of the driving rod 40 and the movable rod 30, a first external thread 32 is disposed on a side wall of the other of the driving rod 40 and the movable rod 30, the threaded hole 41 and the first external thread 32 are both located above the tapered boss 31, and the first external thread 32 is inserted into the threaded hole 41. The threaded connection is adopted to enable the driving rod 40 to drive the movable rod 30 to move, and the driving structure is simple and convenient to arrange.

In this embodiment, the first end of the driving rod 40 is provided with an operation hole, and the driving rod 40 can be driven to rotate by inserting a tool into the operation hole, and the driving rod 40 cannot move.

As shown in fig. 4, the side wall of the tapered boss 31 has a plurality of anti-rotation ribs 311 arranged at intervals and extending axially along the side wall, and each anti-rotation rib 311 is located between two adjacent jaws 20. When the driving lever 40 drives the movable lever 30 to move, the rotation prevention rib 311 is used to increase the friction between the movable lever 30 and the jaw 20 to prevent the movable lever 30 from rotating.

As shown in fig. 3, an annular boss 111 is provided on the inner wall of the first inner hole 11, and the end wall of the second end of the driving rod 40 abuts against the annular boss 111. The drive rod 40 can be supported by the annular boss 111 to prevent the drive rod 40 from moving during rotation.

Of course, other stop structures may be provided between the drive rod 40 and the first bore 11 to prevent movement of the drive rod 40.

As shown in fig. 2 and 3, the first ends of the jaws 20 are fixedly connected to the sleeve 10, and a gap 23 is formed between two adjacent jaws 20. By adopting the structure, a stable connection structure can be formed between the claws 20 and the sleeve 10, so that the claws 20 can move through the gaps 23 and can be switched to the extending position from the recovery position.

In this embodiment, through the fixed connection between the jaws 20 and the sleeve 10, an elastic connection structure can be formed between the jaws 20 and the sleeve 10, so that the jaws 20 can be automatically reset from the extending position to the retracting position.

As shown in fig. 2 and 3, the sidewall of the second end of the sleeve 10 is further provided with a plurality of crack-stopping holes 12 communicated with the first inner hole 11, each crack-stopping hole 12 is communicated with the gap 23 in a one-to-one correspondence, and the diameter of each crack-stopping hole 12 is larger than the size of the gap 23. With the anti-crack holes 12, damage to the wall of the sleeve 10 due to the elastic connection when the jaws 20 are switched to the extended position can be prevented, so as to prolong the service life thereof.

As shown in fig. 1, 5 and 6, the expandable prosthesis extractor further comprises a recycling sleeve 50, the recycling sleeve 50 has a second inner hole 51 penetrating through the recycling sleeve 50, the sleeve 10 is movably arranged in the second inner hole 51 in a penetrating manner, and the recycling sleeve 50 can drive the jaws 20 to switch from the extending position to the recycling position. When the movable rod 30 fails to drive the claws 20 to move, the claws 20 can be switched from the extended position to the retracted position by the recovery sleeve 50 to remove the prosthesis extractor.

Wherein the movable rod 30 fails, either due to the failure of the thread pair or due to the failure of the movable rod 30 due to the excessive torque, and when the failure occurs, the jaws 20 cannot continue to extend outward and thus cannot be engaged with the prosthesis.

As shown in fig. 2 and 6, the second external thread 13 is provided on the outer side wall of the sleeve 10, and the second inner hole 51 has an internal thread 52, and the internal thread 52 is connected to the second external thread 13 so that the sleeve 10 can rotate and move in the axial direction of the sleeve 10. The structure of moving the recovery casing 50 with respect to the casing 10 using the screw has advantages of simple structure and easy operation.

As shown in fig. 6, the first end of the recovery casing 50 is provided with an operation portion 53. The operation portion 53 facilitates the operator to rotate the recovery sleeve 50 to move it, thereby switching the claw 20 to the recovery position.

As shown in fig. 2, the second end of the sleeve 10 is provided with a rotation stop 14, and the sleeve 10 is kept stationary by the rotation stop 14 during the movement of the recovery casing 50. The rotation stopper 14 allows the sleeve 10 to be kept stationary, and the pawl 20 to be switched to the recovery position by the recovery sleeve 50.

In the present embodiment, the rotation stopper 14 is a hexagonal nut welded to the first end of the sleeve 10.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An expandable prosthesis extractor, wherein said expandable prosthesis extractor comprises:

a sleeve (10) having a first inner hole (11) provided therethrough along an axis thereof;

the clamping device comprises a plurality of clamping jaws (20), wherein the clamping jaws (20) are arranged at the first end of the sleeve (10) along the circumferential direction of the sleeve (10), two adjacent clamping jaws (20) are arranged at intervals, each clamping jaw (20) comprises a first end connected with the sleeve (10) and a second end far away from the sleeve (10), a clamping protrusion (21) is arranged on the outer wall of the second end of each clamping jaw (20), and each clamping jaw (20) is provided with a recovery position enabling the clamping protrusion (21) to be recovered and an extending position enabling the clamping protrusion (21) to extend outwards;

the movable rod (30) is movably arranged in the first inner hole (11) in a penetrating mode and is in driving fit with the clamping jaws (20);

the driving rod (40) is arranged in the first inner hole (11) and is positioned above the movable rod (30), and the driving rod (40) drives the movable rod (30) to move along the first inner hole (11) so as to drive the claw (20) to be switched from the recovery position to the extension position;

when a plurality of the jaws (20) are located at the recovery position, a tapered hole (22) is defined by the inner walls of the jaws (20), a tapered boss (31) is arranged at the second end of the movable rod (30), the size of the tapered hole (22) and the size of the tapered boss (31) are gradually increased in the direction from the first end of the sleeve (10) to the second end of the sleeve, and the tapered boss (31) can move in the tapered hole (22) to drive the jaws (20) to be switched from the recovery position to the extension position.

2. The expandable prosthesis extractor according to claim 1, wherein said driving rod (40) is rotatably disposed in said first inner hole (11), one of said driving rod (40) and said movable rod (30) is provided with a threaded hole (41), and the other of said driving rod (40) and said movable rod (30) is provided with a first external thread (32) on the side wall thereof, said threaded hole (41) and said first external thread (32) being located above said tapered boss (31), said first external thread (32) being inserted in said threaded hole (41).

3. The expandable prosthesis extractor according to claim 1, wherein said tapered boss (31) has a plurality of anti-rotation ribs (311) spaced apart from each other and extending axially along the sidewall thereof, each of said anti-rotation ribs (311) being located between two adjacent jaws (20).

4. The expandable prosthesis extractor according to claim 1, wherein an annular projection (111) is provided on the inner wall of said first bore (11), the end wall of the second end of said driving rod (40) abutting against said annular projection (111).

5. The expandable prosthesis extractor according to claim 1, characterized in that said jaws (20) have a first end fixedly connected to said sleeve (10), two adjacent jaws (20) having a gap (23) between them.

6. The expandable prosthesis extractor according to claim 5, wherein a plurality of anti-crack holes (12) are further provided on the sidewall of the second end of the sleeve (10) and are communicated with the first inner hole (11), each anti-crack hole (12) is communicated with the gap (23) in a one-to-one correspondence, and the diameter of the anti-crack hole (12) is larger than the size of the gap (23).

7. The expandable prosthesis extractor according to claim 1, further comprising a retrieval sleeve (50), said retrieval sleeve (50) having a second bore (51) disposed therethrough, said sleeve (10) being movably disposed through said second bore (51), said retrieval sleeve (50) being capable of driving said jaws (20) from said extended position to said retrieved position.

8. The expandable prosthesis extractor according to claim 7, wherein a second external thread (13) is provided on the outer side wall of said sleeve (10), said second internal bore (51) having an internal thread (52), said internal thread (52) being connected to said second external thread (13) so that said sleeve (10) is rotatable and movable in the axial direction of said sleeve (10).

9. The expandable prosthesis extractor of claim 7,

an operating part (53) is arranged at the first end of the recovery sleeve (50); and/or the presence of a gas in the gas,

the second end of the sleeve (10) is provided with a rotation stopping part (14), and the sleeve (10) is kept static through the rotation stopping part (14) in the moving process of the recovery sleeve (50).