Universal precision acetabular cup nail remover

Abstract

The present invention discloses a universal precision acetabular cup nail remover, comprising a handle, a connecting rod is arranged on one side of the handle, the connecting rod is hollow inside, a nail removing rod is arranged in the connecting rod, a rear fork is arranged on the end of the nail removing rod that passes through the outside of the connecting rod, a front fork is arranged on the side of the rear fork away from the connecting rod, the rear fork and the front fork are connected by a hinge structure, a first edge bulge is arranged on the side of the rear fork facing the front fork, a second edge bulge is arranged on the side of the front fork facing the rear fork, a resistance spring is arranged between the first edge bulge and the second edge bulge, a nail removing head is arranged on the end of the front fork away from the rear fork, the head of the nail remover disclosed by the present invention is rotatable, which is convenient for doctors to accurately align the screws of the acetabular cup and solves the problem that the nail remover is difficult to operate, the resistance spring gives a resistance to the hinged structure, so that the head of the nail remover has a certain resistance when rotating, thereby enhancing the hand feel of the user, and thus quickly and accurately positioning the screw position of the acetabular cup.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a universal precision acetabular cup nail remover. Background Art

[0002] After more than 30 years of clinical practice, the therapeutic effect of artificial hip replacement has been fully recognized and has developed into a reliable treatment method. The main purpose of artificial hip replacement is to relieve joint pain, correct deformity, and restore and improve joint movement function.

[0003] During hip surgery, screws and screw removers are required to fix and remove implants. During the operation, the fixing force of the screws is controlled by the doctor's experience, and there is no size limit. If the force is too large, it will cause damage to the body; if it is too small, the screw fixation will be unstable. The implantation angle is determined by visual inspection. When fixing the acetabular cup, the prosthesis will be displaced and the ideal angle cannot be reached. It is easy to dislocate the prosthesis after surgery, leading to revision.

[0004] The universal precise acetabular cup nail remover disclosed in the present invention is used to solve the above-mentioned problem. Summary of the invention

[0005] The purpose of the present invention is to provide a universal precise acetabular cup nail remover to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a universal precision acetabular cup nail remover, comprising a handle, a connecting rod is arranged on one side of the handle, the connecting rod is hollow inside, a nail removing rod is arranged inside the connecting rod, a rear fork is arranged on the end of the nail removing rod passing through the outside of the connecting rod, a front fork is arranged on the side of the rear fork away from the connecting rod, the rear fork and the front fork are connected by a hinge structure, so that the head of the nail remover can rotate freely. The acetabular cup is a prosthesis at the femur position of the human body. During the operation, the doctor needs to operate at the position of the acetabulum, and the operation space is limited and complicated. The head of the nail remover can rotate to a certain degree, so that the operation space is limited and complicated. The doctor can accurately align the screws of the acetabular cup, and the problem that the nail remover is difficult to operate is solved. The side of the rear fork facing the front fork is provided with a No. 1 edge bulge, and the side of the front fork facing the rear fork is provided with a No. 2 edge bulge, and a resistance spring is provided between the No. 1 edge bulge and the No. 2 edge bulge. The resistance spring gives a resistance to the hinged structure, so that the head of the nail remover has a certain resistance when rotating, which enhances the user's hand feel and thus quickly and accurately locates the screw position of the acetabular cup. The end of the front fork away from the rear fork is provided with a nail remover head, and the nail remover is used to insert into the screw head hole, and then the nail remover is rotated to remove the screw.

[0007] Preferably, the hinge structure includes a groove, a fixed block, a connecting block and a pin. The front fork is provided with a groove at one end facing the rear fork, a fixed block is provided in the groove, and the rear fork is provided with a connecting block at one end close to the front fork. The connecting block and the fixed block are hinged by the pin. When in use, the rear fork and the front fork rotate around the pin as the axis, and the nail head can rotate freely driven by the front fork.

[0008] Preferably, the fixing block and the front fork are connected via a No. 1 fixing pin, the rear fork and the connecting rod are connected via a No. 2 fixing pin, and the rear fork and the connecting block are integrally formed.

[0009] Preferably, the nail remover head is a spiral hexagonal head, which can be inserted into the hole of the screw head to clamp the screw. In the process of rotating the nail remover, the clamping force of the nail remover on the screw becomes stronger and stronger, preventing the screw from falling.

[0010] Preferably, a No. 1 pressure block, a torsion spring, a No. 2 pressure block, and a screw are sequentially arranged in the connecting rod at one end of the nail removal rod. The screw is screwed to the inner wall of the connecting rod, and one end passes through the outside of the connecting rod. The end of the screw passing through the outside of the connecting rod is fixedly connected to the handle by a pin. The No. 1 pressure block and the nail removal rod are connected by a slip-off tooth. The nail remover can also be used to tighten the screw. When tightening the screw during general surgery, it is necessary to tighten it to an appropriate force. Too much force will cause damage to the screw thread, and too little force will cause the acetabular cup to be easily loosened. In severe cases, the acetabular cup needs to be replaced. Even postoperative repair is required, so it is important to tighten the screws to an appropriate force. When using the present nail remover, the torque of the nail remover can be adjusted first, that is, the handle is turned to drive the screw rod and the inner wall of the connecting rod to make a screw connection movement, and the screw rod moves along the inner wall of the connecting rod, pressing the No. 2 pressing block, the torsion spring, and the No. 1 pressing block in turn, so that the pressure of the No. 1 pressing block on the nail removal rod changes, that is, the limit torque of the No. 1 pressing block and the nail removal rod slipping is changed. When the nail removal rod is rotated to exceed the limit torque, the No. 1 pressing block and the nail removal rod slip, and the nail remover cannot continue to be tightened.

[0011] Preferably, stops are provided on the side walls of the connecting rod and the nail removal rod, which allow the nail removal rod to move slightly relative to the connecting rod but not to rotate relative to the connecting rod. When the rotation of the nail removal rod reaches the limit torque, the space for the micro-motion assists in slipping, thereby preventing changes in the limit torque due to failure of the slipping teeth.

[0012] Preferably, a stop block is provided in the middle of the connecting rod, the stop block is sleeved on the connecting rod, an elastic arm is provided inside the stop block, an elastic arm groove is provided on the outside of the connecting rod corresponding to the elastic arm, the elastic arm and the stop block are fixedly connected, a stop strip is provided inside the end of the stop block close to the handle, and a stop groove is provided at the corresponding positions of the handle and the stop strip. Since the stop strip is located in the stop groove groove and the elastic arm is clamped in the elastic arm groove, the handle cannot rotate relative to the connecting rod. When the limit torque needs to be adjusted, the stop block is manually pushed so that the stop strip slides out of the stop groove groove, the elastic arm slides out of the elastic arm groove, the stop effect of the stop block on the handle disappears, and the handle is rotatable relative to the connecting rod. Rotating the handle drives the screw to adjust the torque.

[0013] Preferably, the nail removal rod and the No. 1 pressure block are also connected by an elastic beam, a No. 1 strain gauge is provided on the elastic beam on one side of the nail removal rod, and a No. 2 strain gauge is provided on the elastic beam on one side of the No. 1 pressure block, the No. 1 strain gauge, the No. 2 strain gauge and the elastic beam are bonded by micro-melted glass glue, a display screen is provided on the outside of the connecting rod, the No. 1 strain gauge, the No. 2 strain gauge and the display screen are electrically connected, and the display screen is used to display the torque size, when the nail removal rod is rotated to the limit torque at which the No. 1 pressure block and the nail removal rod slip, the display screen can warn to stop continuous rotation, and the display screen is used to display the torque size in real time for the operator's reference.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0015] 1. During the operation, the doctor needs to operate at the position of the acetabulum, and the operation space is limited and complicated. The head of the nail remover disclosed in the present invention can rotate, which is convenient for the doctor to accurately align the screw of the acetabulum cup, and solves the problem that the nail remover is difficult to operate. The resistance spring gives a resistance to the hinged structure, so that the head of the nail remover has a certain resistance when rotating, which enhances the user's hand feeling, and thus quickly and accurately locates the screw position of the acetabulum cup;

[0016] 2. The hexagonal nail remover head is inserted into the hole of the screw head to clamp the screw. In the process of rotating the nail remover, the clamping force of the nail remover head on the screw becomes stronger and stronger to prevent the screw from falling off.

[0017] 3. When tightening the screws during general surgery, it is necessary to tighten them to an appropriate force. Too much force will damage the screw thread, and too little force will cause the acetabular cup to loosen easily. In severe cases, the acetabular cup needs to be replaced or even repaired after surgery. Therefore, it is important to tighten the screws to an appropriate force. When using this nail remover, the torque of the nail remover can be adjusted first. When the nail remover rod is rotated to exceed the limit torque, the No. 1 pressing block and the nail remover rod slip, and the nail remover cannot continue to tighten, preventing the chance of screw thread damage and postoperative revision.

[0018] 4. The display screen can show the torque size. When the nail removal rod is rotated to the limit torque at which the No. 1 pressing block and the nail removal rod slip, the display screen can warn to stop continuous rotation. At the same time, the display screen is used to display the torque size in real time for the operator's reference. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 is a front view of the universal precision acetabular cup nail remover of the present invention;

[0021] Figure 2 It is a partial cross-sectional view of A of the present invention;

[0022] Figure 3 is a cross-sectional view of the universal precision acetabular cup nail remover of the present invention;

[0023] Figure 4 It is a detail diagram of B of the present invention;

[0024] Figure 5 It is a detail diagram of location C of the present invention;

[0025] In the figure: 1. handle; 2. connecting rod; 3. rear fork; 4. front fork; 5. No. 1 edge convex; 6. No. 2 edge convex; 7. resistance spring; 8. groove; 9. fixing block; 10. connecting block; 11. No. 1 fixing pin; 12. No. 2 fixing pin; 13. nail removal rod; 14. No. 1 pressing block; 15. torsion spring; 16. No. 2 pressing block; 17. screw rod; 18. slip-off tooth; 19. stop; 20. anti-rotation block; 21. elastic arm; 22. elastic arm groove; 23. anti-rotation strip; 24. anti-rotation groove; 25. elastic beam; 26. No. 1 strain gauge; 27. No. 2 strain gauge; 28. display screen; 29. ​​hinge structure; 30. pin; 31. nail removal head. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example: See Figures 1 to 5The present invention provides a technical solution: a universal precision acetabular cup nail remover, comprising a handle 1, a connecting rod 2 is arranged on one side of the handle 1, the connecting rod 2 is hollow inside, a nail removing rod 13 is arranged inside the connecting rod 2, a rear fork 3 is arranged on the end of the nail removing rod 13 passing through the outside of the connecting rod 2, a front fork 4 is arranged on the side of the rear fork 3 away from the connecting rod 2, the rear fork 3 and the front fork 4 are connected by a hinge structure 29, so that the head of the nail remover can rotate freely. The acetabular cup is a prosthesis at the femoral position of the human body. During the operation, the doctor needs to operate at the position of the acetabulum, and the operation space is limited and complicated. The head of the nail remover can rotate 360 ​​degrees, which is convenient for the doctor to accurately The screws of the acetabular cup are accurately aligned, and the problem that the nail remover is difficult to operate is solved. A first edge protrusion 5 is arranged on the side of the rear fork 3 facing the front fork 4, and a second edge protrusion 6 is arranged on the side of the front fork 4 facing the rear fork 3. A resistance spring 7 is arranged between the first edge protrusion 5 and the second edge protrusion 6. The resistance spring 7 gives a resistance to the hinge structure 29, so that the head of the nail remover has a certain resistance when rotating, which enhances the user's hand feeling and thus quickly and accurately locates the screw position of the acetabular cup. A nail remover head 12 is arranged on the end of the front fork 4 away from the rear fork 3. The nail remover head 12 is used to be inserted into the screw head hole, and then the nail remover is rotated to remove the screw.

[0028] The hinge structure 29 includes a groove 8, a fixing block 9, a connecting block 10, and a pin 30. The groove 8 is provided at the end of the front fork 4 facing the rear fork 3, and the fixing block 9 is provided in the groove 8. The connecting block 10 is provided at the end of the rear fork 3 close to the front fork 4. The connecting block 10 and the fixing block 9 are hinged by the pin 30. When in use, the rear fork 3 and the front fork 4 rotate around the pin 30, and the nail head can rotate freely driven by the front fork 4.

[0029] The fixing block 9 and the front fork 4 are connected via a No. 1 fixing pin 11 , the rear fork 3 and the connecting rod 2 are connected via a No. 2 fixing pin 12 , and the rear fork 3 and the connecting block 10 are integrally formed.

[0030] The nail remover head 12 is a spiral hexagonal one. The spiral hexagonal nail remover head 12 can be inserted into the hole of the screw head to clamp the screw. In the process of rotating the nail remover, the clamping force of the nail remover head 12 on the screw becomes stronger and stronger to prevent the screw from falling.

[0031] A No. 1 pressure block 14, a torsion spring 15, a No. 2 pressure block 16, and a screw 17 are arranged in sequence at one end of the connecting rod 2 and the nail removal rod 13. The screw 17 is screwed to the inner wall of the connecting rod 2, and one end passes through the outside of the connecting rod 2. The end of the screw 17 passing through the outside of the connecting rod 2 is fixedly connected to the handle 1 by a pin. The No. 1 pressure block 14 and the nail removal rod 13 are connected by a slip-off tooth 18. The nail removal device can also be used to tighten the screw. When tightening the screw during a general operation, it is necessary to tighten it to an appropriate force. Too much force will cause the screw thread to be damaged, and too little force will cause the acetabular cup to be easily loosened. In severe cases, the acetabular cup needs to be replaced or even repaired after surgery. Therefore, it is important to tighten the screws to an appropriate force. When using the present nail remover, the torque of the nail remover can be adjusted first, that is, the handle 1 is turned to drive the screw rod 17 and the inner wall of the connecting rod 2 to make a screwing movement. The screw rod 17 moves along the inner wall of the connecting rod 2, and presses the No. 2 pressing block 16, the torsion spring 15, and the No. 1 pressing block 14 in sequence, so that the pressure of the No. 1 pressing block 14 on the nail removal rod 13 changes, that is, the limit torque of the No. 1 pressing block 14 and the nail removal rod 13 slipping is changed. When the nail removal rod 13 is rotated to exceed the limit torque, the No. 1 pressing block 14 and the nail removal rod 13 slip, and the nail remover cannot be tightened further.

[0032] A stopper 19 is provided on the side walls of the connecting rod 2 and the nail removing rod 13, which allows the nail removing rod 13 to move slightly relative to the connecting rod 2, but cannot rotate relative to the connecting rod 2. When the rotation of the nail removing rod 13 reaches the limit torque, the space for the micro-motion assists in slipping, thereby preventing the change of the limit torque due to the failure of the slipping tooth 18.

[0033] A stop block 20 is provided in the middle of the connecting rod 2, and the stop block 20 is sleeved on the connecting rod 2. An elastic arm 21 is provided inside the stop block 20, and an elastic arm groove 22 is provided at the position corresponding to the elastic arm 21 on the outside of the connecting rod 2. The elastic arm 21 and the stop block 20 are fixedly connected, and a stop bar 23 is provided inside the end of the stop block 20 close to the handle 1, and a stop groove 24 is provided at the position corresponding to the handle 1 and the stop bar 23. Since the stop bar 23 is located in the stop groove 24 and the elastic arm 21 is clamped in the elastic arm groove 22, the handle 1 cannot rotate relative to the connecting rod 2. When the limit torque needs to be adjusted, the stop block 20 is manually pushed to make the stop bar 23 slide out of the stop groove 24, and the elastic arm 21 slides out of the elastic arm groove 22. The stopping effect of the stop block 20 on the handle 1 disappears, and the handle 1 is rotatable relative to the connecting rod 2. Rotating the handle drives the screw 17 to adjust the torque.

[0034] The nail removal rod 13 and the No. 1 pressure block 14 are also connected by an elastic beam 25. A No. 1 strain gauge 26 is provided on the elastic beam 25 on one side of the nail removal rod 13, and a No. 2 strain gauge 27 is provided on the elastic beam 25 on one side of the No. 1 pressure block 14. The No. 1 strain gauge 26, the No. 2 strain gauge 27 and the elastic beam 25 are bonded by micro-melting glass glue. A display screen 28 is provided on the outside of the connecting rod 2. The No. 1 strain gauge 26, the No. 2 strain gauge 27 and the display screen 28 are electrically connected. The display screen 28 is used to display the torque size. When the nail removal rod 13 is rotated to the limit torque at which the No. 1 pressure block 14 and the nail removal rod 13 slip, the display screen 28 can warn to stop continuous rotation. At the same time, the display screen 28 is used to display the torque size in real time for the operator's reference.

[0035] The working principle of the present invention is as follows: when removing the screw, first adjust the universal precision acetabular cup nail remover to a suitable torque, then extend the nail remover head 12 into the acetabular cup, and the nail remover head 12 rotates at a certain angle through the hinge structure 29 and the nail remover rod 13. At the same time, the resistance spring 7 gives the hinge structure 29 a resistance, so that the nail remover head 12 has a certain resistance when rotating, which enhances the user's hand feeling, and then quickly and accurately locates the screw position of the acetabular cup. After the positioning is completed, manually rotate the handle 1, which drives the connecting rod 2 and the nail remover rod 13 to rotate in turn to loosen the thread. During the rotation process, observe the torque displayed on the display screen 28 in real time. If the torque value is about to exceed the torque value, stop rotating, readjust the nail remover to a suitable torque, and complete the screw removal action;

[0036] When tightening the screw, first adjust the universal precision acetabular cup screw remover to a suitable torque, then insert the screw head 12 into the screw to clamp the screw, and then insert the screw head 12 into the acetabular cup to tighten the screw. During the rotation process, observe the torque displayed on the display screen 28 in real time. If the torque value is about to exceed the torque value, stop rotating to complete the installation of the screw. If the rotation continues, the No. 1 pressing block 14 and the screw removal rod 13 will slip, protecting the screw thread from damage.

[0037] The principle of torque adjustment is: turning the handle 1 drives the screw rod 17 and the inner wall of the connecting rod 2 to make a screw connection movement, the screw rod 17 moves along the inner wall of the connecting rod 2, and presses the second pressing block 16, the torsion spring 15, and the first pressing block 14 in sequence, so that the pressure of the first pressing block 14 on the nail removal rod 13 changes, that is, the limit torque of the first pressing block 14 and the nail removal rod 13 slipping is changed;

[0038] The principle of the torsion displayed on the display screen 28 is: through the torsion of the elastic beam 25, the strain gauge No. 1 26 and the strain gauge No. 2 27 sense the resistance change and transmit the resistance change to the controller, and the controller converts the resistance signal into a digital signal and transmits it to the display screen 28 for display.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A universal precision acetabular cup nail remover, comprising a handle (1), characterized in that: A connecting rod (2) is provided on one side of the handle (1), the connecting rod (2) is hollow inside, a nail removing rod (13) is provided inside the connecting rod (2), a rear fork (3) is provided on one end of the nail removing rod (13) that passes through the connecting rod (2), a front fork (4) is provided on the side of the rear fork (3) away from the connecting rod (2), the rear fork (3) and the front fork (4) are connected via a hinge structure (29), a first edge protrusion (5) is provided on the side of the rear fork (3) facing the front fork (4), a second edge protrusion (6) is provided on the side of the front fork (4) facing the rear fork (3), a resistance spring (7) is provided between the first edge protrusion (5) and the second edge protrusion (6), and a nail removing head (12) is provided on the end of the front fork (4) away from the rear fork (3); The hinge structure (29) comprises a groove (8), a fixing block (9), a connecting block (10), and a pin (30); the groove (8) is arranged at one end of the front fork (4) facing the rear fork (3); the fixing block (9) is arranged in the groove (8); the connecting block (10) is arranged at one end of the rear fork (3) close to the front fork (4); the connecting block (10) and the fixing block (9) are hingedly connected via the pin (30); A rotation-stop block (20) is arranged in the middle of the connecting rod (2), an elastic arm (21) is arranged inside the rotation-stop block (20), an elastic arm groove (22) is arranged outside the connecting rod (2) at a position corresponding to the elastic arm (21), a rotation-stop bar (23) is arranged inside one end of the rotation-stop block (20) close to the handle (1), and a rotation-stop groove (24) is arranged at a position corresponding to the handle (1) and the rotation-stop bar (23).

2. The universal precision acetabular cup nail remover according to claim 1, characterized in that: The fixing block (9) and the front fork (4) are connected via a No. 1 fixing pin (11), the rear fork (3) and the connecting rod (2) are connected via a No. 2 fixing pin (12), and the rear fork (3) and the connecting block (10) are integrally formed.

3. The universal precision acetabular cup nail remover according to claim 1, characterized in that: The nail starting head (12) is a hexagonal spiral.

4. The universal precision acetabular cup nail remover according to claim 1, characterized in that: A first pressing block (14), a torsion spring (15), a second pressing block (16), and a screw rod (17) are sequentially arranged in the connecting rod (2) at one end of the nail removal rod (13). The screw rod (17) is screwed to the inner wall of the connecting rod (2), and one end of the screw rod (17) passes through the outside of the connecting rod (2). The end of the screw rod (17) passing through the outside of the connecting rod (2) is fixedly connected to the handle (1) by a pin, and the first pressing block (14) and the nail removal rod (13) are connected by a slip-off tooth (18).

5. The universal precision acetabular cup nail remover according to claim 1, characterized in that: Stoppers (19) are provided on the side walls of the connecting rod (2) and the nail removing rod (13).

6. The universal precision acetabular cup nail remover according to claim 4, characterized in that: The nail removal rod (13) and the first pressing block (14) are also connected via an elastic beam (25); a first strain gauge (26) is provided on the elastic beam (25) at one side of the nail removal rod (13); a second strain gauge (27) is provided on the elastic beam (25) at one side of the first pressing block (14); a display screen (28) is provided outside the connecting rod (2); and the first strain gauge (26), the second strain gauge (27) and the display screen (28) are electrically connected.

Images