Assembly device and method for a double-action cup liner and a ball head prosthesis

Abstract

The present invention provides an assembly device and method for a double-action cup liner and a ball head prosthesis, which solves the technical problem of a high risk of postoperative infection caused by manual assembly during the traditional double-action cup liner and ball head prosthesis assembly process. The device comprises a holding mechanism, a handle, and a chassis. The chassis is provided with a handle, which is semi-lunar in shape. The handle comprises a fixing portion, a connecting portion, and a supporting portion provided between the fixing portion and the connecting portion. The fixing portion, the supporting portion, and the connecting portion are an integrally formed structure. The fixing portion is fixed to the chassis by a positioning bolt. A gasket is provided on the front surface of the fixing portion, and the gasket is fixed to the fixing portion by a positioning screw. The front end of the connecting portion is connected to the holding mechanism, and the holding mechanism comprises a torque rod, a holding rod, a guide rod, and a pressing member. The present invention can be widely used in the field of medical device technology.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and more particularly, relates to an assembly device and method for a double-action cup liner and a ball head prosthesis. Background Art

[0002] The dual-action cup acetabular system offers a low post-operative dislocation rate, excellent range of motion, and high long-term survival rates. It is a good choice for patients with joint mechanical imbalance, joint revision, or other joint instability. In recent years, with the increasing awareness of prostheses, more and more patients are choosing to implant dual-action cup prostheses. The question of how to successfully implant the prosthesis and reduce the risk of post-operative infection has always plagued medical professionals. In traditional surgical instruments, the assembly process of the dual-action cup liner and the ball head prosthesis requires a large number of unavoidable manual steps, which greatly increases the chance of post-operative infection. Summary of the Invention

[0003] The present invention is intended to address the deficiencies of the above-mentioned background technology and provides an assembly device and method for a double-action cup liner and ball head prosthesis that is simple in structure, sturdy and durable, easy to use and operate, significantly reduces manual operation steps, reduces the chance of postoperative infection in patients, significantly improves safety of use, and increases the success rate of surgery.

[0004] The present invention provides an assembly device for a double-action cup liner and a ball head prosthesis, which is provided with a holding mechanism, a handle and a chassis. The chassis is provided with a handle, which is semi-lunar in shape. The handle is provided with a fixing part, a connecting part and a supporting part provided between the fixing part and the connecting part. The fixing part, the supporting part and the connecting part are an integrally formed structure. The fixing part is fixed to the chassis by a positioning bolt. A gasket is provided on the front end surface of the fixing part, and the gasket is fixed to the fixing part by a positioning screw. The front end of the connecting part is connected to the holding mechanism, and the holding mechanism is provided with a torque rod, a holding rod, a guide rod and a clamping member.

[0005] Preferably, the holding rod is provided with a coupling portion and a long rod portion, the coupling portion and the long rod portion are an integrally formed structure, the coupling portion is provided with an axial hole communicating front to back, the torque rod passes through the axial hole and is vertically connected to the holding rod, and the torque rod can slide relative to the holding rod in the axial hole.

[0006] Preferably, the long rod portion of the holding rod passes through the first through hole at the front end of the connecting portion, and the inner wall of the first through hole is provided with an internal thread that matches the external thread of the long rod portion of the holding rod, and the external thread of the long rod portion is a small pitch thread.

[0007] Preferably, the long rod portion of the holding rod is connected to the clamping piece through a sleeve rod, the upper end of the sleeve rod is provided with a first connecting groove for connecting with the long rod portion of the holding rod, and the lower end of the sleeve rod is provided with a second connecting groove for connecting with the plunger body on the upper end surface of the clamping piece.

[0008] Preferably, a guide rod is provided parallel to one side of the holding rod close to the support portion, the upper end of the guide rod passes through the second through hole of the connecting portion, and the lower end of the guide rod is inserted into the connecting hole on the upper end surface of the pressing member.

[0009] Preferably, a suction cup is provided inside the pressing member, and the suction cup is made of soft silicone material.

[0010] Preferably, the pressing piece and the gasket are made of medical PPSU material.

[0011] Preferably, a plurality of weight-reducing holes are provided on the fixing portion, the supporting portion and the connecting portion.

[0012] A method for assembling a double-action cup liner and a ball head prosthesis, using any of the above-mentioned assembling devices for a double-action cup liner and a ball head prosthesis, specifically comprising the following steps:

[0013] (1) Before use, tighten the positioning bolts to fix the handle and chassis so that the handle and chassis are stably connected. Then rotate the torque rod so that the holding rod drives the pressing piece to move upward, increasing the distance between the pressing piece and the gasket. During the upward movement, the guide rod limits the rotation of the pressing piece.

[0014] (2) When the holding rod rises to a certain height, the sterile packaging of the double-action cup liner is opened, and the top of the ball on the back of the double-action cup liner is placed in the suction cup with a slight force. The double-action cup liner is held by the suction cup, and the ball head prosthesis is placed on the gasket. Then, the torque rod is rotated in the opposite direction, so that the holding rod drives the pressing part to move downward. During the downward movement, the guide rod limits the rotation of the pressing part;

[0015] (3) When the double-action cup liner and the ball prosthesis reach the contact point, apply a little force until the double-action cup liner and the ball prosthesis reach the ready-to-assemble state. At this time, the center of gravity of the device is placed on the extension of the center of the chassis, and the device as a whole reaches the most stable state.

[0016] (4) Adjust the torque by sliding the torque rod left and right, and pressurize the pressing part through the torque rod until the air between the double-action cup liner and the ball head prosthesis is exhausted, and the assembly is completed.

[0017] The beneficial effects of the present invention are:

[0018] (1) The present invention is provided with a holding mechanism and a handle, which not only maintains the stability of the device itself, but also distributes the assembly force of the double-action cup liner and the ball head prosthesis, avoids the violent assembly action caused by manual operation, reduces the damage to the prosthesis, and effectively reduces the manual assembly operation of the double-action cup liner and the ball head prosthesis in traditional surgery, thereby reducing the chance of infection after the ball head prosthesis is implanted, significantly improving the safety of use and increasing the success rate of the operation.

[0019] (2) The handlebar of the present invention is provided with a coupling portion and a long rod portion. The coupling portion is used to connect the torque rod. The torque rod can slide left and right relative to the handlebar to adjust the torque and thus the pressure during assembly. The long rod portion is provided with a small pitch thread. Through the small pitch thread screw-in compression assembly, the assembly force between the double-action cup liner and the ball prosthesis is shared, greatly reducing the risk of the ball prosthesis falling due to violent assembly.

[0020] (3) The holding mechanism of the present invention is provided with a guide rod, which is used to fix the rotation of the clamping member so that the double-action cup liner and the ball head prosthesis only bear downward pressure during the assembly process, preventing damage caused by friction between the clamping member and the gasket, thereby extending the service life of the device.

[0021] (4) The present invention is provided with a handle, which adopts a half-moon structure design. Such a structure design pulls the overall center of gravity of the device to the extension line of the center of the chassis, making the double-action cup liner and the ball head prosthesis more stable during the assembly process, and eliminating the risk of the ball head prosthesis falling due to the offset of the center of gravity during the assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 It is the overall structural diagram of the present invention;

[0024] Figure 2 is a cross-sectional view of the present invention;

[0025] Figure 3 for Figure 2 A magnified view of middle A;

[0026] Explanation of symbols in the figure:

[0027] 1. Handle; 2. Chassis; 3. Guide rod; 4. Fixing part; 5. Support part; 6. Connecting part; 7. Gasket; 8. Weight-reducing hole; 9. Torque rod; 10. Holding rod; 11. Suction cup; 12. Pressing piece; 13. Coupling part; 14. Long rod part; 15. First through hole; 16. Second through hole; 17. Sleeve rod; 18. First connecting groove; 19. Second connecting groove. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "front", "back", "inside", "outside", "middle", etc. indicate orientations or positional relationships based on the orientations or positional relationships described in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0030] like Figure 1 As shown, the present invention provides an assembly device for a double-action cup liner and a ball head prosthesis, which is provided with a holding mechanism, a handle 1 and a chassis 2, the chassis 2 is circular, and a handle 1 is provided on the chassis 2, and the handle 1 is semi-lunar. Such a structural design can pull the overall center of gravity of the device to the extension line of the center of the chassis 2, so that the double-action cup liner and the ball head prosthesis are more stable during the assembly process, and eliminate the risk of the ball head prosthesis falling due to the offset of the center of gravity during the assembly process.

[0031] like Figure 1-2 As shown, the handle 1 comprises a fixing portion 4, a connecting portion 6, and a support portion 5 disposed between the fixing portion 4 and the connecting portion 6. The fixing portion 4, the support portion 5, and the connecting portion 6 are formed into an integral structure. The fixing portion 4 is secured to the chassis 2 via a set screw. By tightening the set screw, the connection between the handle 1 and the chassis 2 is strengthened and stabilized. A gasket 7 is provided on the front surface of the fixing portion 4. The gasket 7 is made of medical-grade PPSU and is secured to the fixing portion 4 via a set screw.

[0032] The fixing portion 4 is connected to the supporting portion 5, which is arc-shaped. This structure makes it more suitable for human handheld operation comfort, simple and light to use, and has a good grip. The upper end of the supporting portion 5 is connected to the connecting portion 6, which is arranged parallel to the fixing portion 4. In order to reduce the weight of the device itself, conform to the simple and lightweight design characteristics, and facilitate medical staff to pick up and assemble the device, a number of weight-reducing holes 8 are provided in the fixing portion 4, the supporting portion 5, and the connecting portion 6. The front end of the connecting portion 6 is connected to the holding mechanism, which is equipped with a torque rod 9, a holding rod 10, a guide rod 3, and a clamping member 12.

[0033] Furthermore, if Figure 2As shown, the holding rod 10 is provided with a coupling portion 13 and a long rod portion 14. The coupling portion 13 and the long rod portion 14 are an integrally formed structure. The coupling portion 13 is provided with an axial hole that is connected front to back. The torque rod 9 passes through the axial hole and is vertically connected to the holding rod 10. The torque rod 9 can slide relative to the holding rod 10 in the axial hole to adjust the torque. The long rod portion 14 of the holding rod 10 passes through the first through hole 15 at the front end of the connecting portion 6. The inner wall of the first through hole 15 is provided with an internal thread that cooperates with the external thread of the long rod portion 14 of the holding rod 10. Through the cooperation of the internal and external threads of the long rod portion 14 and the first through hole 15, the holding rod 10 can be manually rotated so that the holding rod 10 moves up or down. Moreover, the external thread of the long rod portion 14 is a small pitch thread. The use of a small pitch thread screw-in compression assembly distributes the force required to assemble the prosthesis, greatly reducing the risk of the ball head prosthesis falling due to violent assembly.

[0034] The long rod portion 14 of the holding rod 10 is connected to the pressing member 12 through the sleeve rod 17. Specifically, Figure 3 As shown, the upper end of the sleeve rod 17 is provided with a first connecting groove 18 for connecting to the long rod portion 14 of the holding rod 10; the lower end of the sleeve rod 17 is provided with a second connecting groove 19 for connecting to the pressing member 12. The pressing member 12 is in the shape of a truncated cone, and the upper end surface of the pressing member 12 is provided with a plunger body, which is arranged in the second connecting groove 19. A suction cup 11 is provided inside the pressing member 12 for holding the liner of the double-action cup. The pressing member 12 is made of medical PPSU material, which not only has the characteristics of high temperature non-deformation and wear resistance, but also cooperates with the suction cup 11 made of soft silicone material to enhance the synergy. On the one hand, it improves the tension inside the suction cup 11 and the pressing member 12, so that the suction cup 11 is firmly fixed to the inside of the pressing member 12. On the other hand, it can also ensure the durability of the entire device structure, extend the service life, and reduce the number of times the pressing member 12 needs to be replaced.

[0035] To prevent the holding rod 10 from rotating the pressing member 12 during its upward rotation, a guide rod 3 is provided parallel to the side of the holding rod 10 near the support portion 5. The upper end of the guide rod 3 is connected to the connecting portion 6, and the lower end of the guide rod 3 is connected to the pressing member 12. Specifically, the connecting portion 6 is provided with a second through-hole 16, and the upper end surface of the pressing member 12 is provided with a connecting hole. The upper end of the guide rod 3 passes through the second through-hole 16, and the lower end of the guide rod 3 is inserted into the connecting hole. By utilizing the guide rod 3, the rotation of the pressing member 12 is prevented, so that the double-action cup liner and the ball head prosthesis only bear downward pressure during assembly, reducing damage caused by friction between the pressing member 12 and the gasket 7, and extending the service life of the device.

[0036] A method for assembling a double-action cup liner and a ball head prosthesis, using the above-mentioned assembly device for the double-action cup liner and the ball head prosthesis, specifically comprising the following steps:

[0037] (1) Before use, tighten the positioning bolts to fix the handle 1 and the chassis 2 so that the handle 1 and the chassis 2 are stably connected. Then rotate the torque rod 9 so that the holding rod 10 drives the pressing member 12 to move upward, thereby increasing the distance between the pressing member 12 and the gasket 7. During the upward movement, the guide rod 3 limits the rotation of the pressing member 12.

[0038] (2) When the holding rod 10 rises to a certain height, the sterile packaging of the double-action cup liner is unpacked, and the top of the ball on the back of the double-action cup liner is placed in the suction cup 11 with a slight force. The double-action cup liner is held by the suction cup 11, and the ball head prosthesis is placed on the gasket 7. Then, the torque rod 9 is rotated in the opposite direction, so that the holding rod 10 drives the pressing piece 12 to move downward. During the downward movement, the guide rod 3 limits the rotation of the pressing piece 12;

[0039] (3) When the double-action cup liner and the ball prosthesis reach the contact point, a slight force is applied, and the double-action cup liner and the ball prosthesis reach the state to be assembled. At this time, the center of gravity of the device is placed on the extension of the center of the chassis 2, and the device as a whole reaches the most stable state;

[0040] (4) The torque is adjusted by sliding the torque rod 9 left and right, and the pressing member 12 is pressurized by the torque rod 9 until the air between the double-action cup liner and the ball head prosthesis is exhausted, and the assembly is completed.

[0041] To sum up, the present invention is provided with a holding mechanism and a handle 1, which not only maintains the stability of the device itself, but also shares the assembly force of the double-action cup liner and the ball head prosthesis, avoids violent assembly actions caused by manual operation, reduces damage to the prosthesis, and effectively reduces the manual assembly operation of the double-action cup liner and the ball head prosthesis in traditional surgery, thereby reducing the chance of infection after the ball head prosthesis is implanted, significantly improving the safety of use and the success rate of the operation; the holding mechanism is provided with a holding rod 10, the holding rod 10 is provided with a coupling portion 13 and a long rod portion 14, the coupling portion 13 is used to connect the torque rod 9, the torque rod 9 can slide left and right relative to the holding rod 10 to adjust the magnitude of the torque, thereby adjusting the magnitude of the pressure during the assembly process. The long rod 14 is provided with a small pitch thread, which is screwed in and pressed together with the small pitch thread to share the assembly force between the double-action cup liner and the ball head prosthesis, greatly reducing the risk of the ball head prosthesis falling due to violent assembly; the holding mechanism is also provided with a guide rod 3, which is used to limit the rotation of the clamping piece 12, so that the double-action cup liner and the ball head prosthesis only bear downward pressure during the assembly process, preventing damage caused by friction between the clamping piece 12 and the gasket 7, thereby extending the service life of the device; the handle 1 connected to the holding mechanism adopts a half-moon structure design, which pulls the overall center of gravity of the device to the extension line of the center of the chassis 2, making the double-action cup liner and the ball head prosthesis more stable during the assembly process, and eliminating the risk of the ball head prosthesis falling due to the offset of the center of gravity during the assembly process.

[0042] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A device for assembling a double-action cup liner and a ball head prosthesis, comprising a holding mechanism, a handle and a chassis, wherein: The chassis is provided with a handle, which is in a half-moon shape. The handle is provided with a fixing portion, a connecting portion and a supporting portion provided between the fixing portion and the connecting portion. The fixing portion, the supporting portion and the connecting portion are an integrally formed structure. The fixing portion is fixed to the chassis by a positioning bolt. A gasket is provided on the front end surface of the fixing portion, and the gasket is fixed to the fixing portion by a positioning screw. The front end of the connecting portion is connected to a holding mechanism, and the holding mechanism is provided with a torque rod, a holding rod, a guide rod and a pressing member. The holding rod is provided with a coupling portion and a long rod portion. The coupling portion is provided with a There is an axial hole communicating with the front and back, the torque rod passes through the axial hole and is vertically connected to the holding rod, and the torque rod slides relative to the holding rod in the axial hole, the long rod portion of the holding rod is connected to the clamping piece through a sleeve rod, the upper end of the sleeve rod is provided with a first connecting groove for connecting with the long rod portion of the holding rod, the lower end of the sleeve rod is provided with a second connecting groove for connecting with the plunger body on the upper end face of the clamping piece, a guide rod is provided in parallel on the side of the holding rod close to the support portion, the upper end of the guide rod passes through the second through hole of the connecting portion, and the lower end of the guide rod is inserted into the connecting hole on the upper end face of the clamping piece.

2. The assembly device of the double-action cup liner and the ball head prosthesis according to claim 1 is characterized in that: The coupling portion and the long rod portion are an integrally formed structure.

3. The assembly device of the double-action cup liner and the ball head prosthesis according to claim 2 is characterized in that: The long rod portion of the holding rod passes through the first through hole at the front end of the connecting portion. The inner wall of the first through hole is provided with an internal thread that matches the external thread of the long rod portion of the holding rod. The external thread of the long rod portion is a small pitch thread.

4. The assembly device of the double-action cup liner and the ball head prosthesis according to claim 1 is characterized in that: A suction cup is provided inside the pressing member, and the suction cup is made of soft silicone material.

5. The assembly device of the double-action cup liner and the ball head prosthesis according to claim 1 is characterized in that: The pressing piece and the gasket are made of medical PPSU material.

6. The assembly device of the double-action cup liner and the ball head prosthesis according to claim 1 is characterized in that: A plurality of weight-reducing holes are provided on the fixing portion, the supporting portion and the connecting portion.

7. A method for assembling a double-action cup liner and a ball head prosthesis, characterized in that: The assembly device for the double-action cup liner and the ball head prosthesis according to any one of claims 1 to 6 is used, and the steps are as follows: (1) Before use, tighten the positioning bolts to fix the handle and chassis so that the handle and chassis are stably connected. Then rotate the torque rod so that the holding rod drives the pressing piece to move upward, increasing the distance between the pressing piece and the gasket. During the upward movement, the guide rod limits the rotation of the pressing piece. (2) When the holding rod rises to a certain height, the sterile packaging of the double-action cup liner is opened, and the ball top of the double-action cup liner is placed in the suction cup with a slight force. The double-action cup liner is held by the suction cup, and the ball head prosthesis is placed on the gasket. Then, the torque rod is rotated in the opposite direction, so that the holding rod drives the pressing part to move downward. During the downward movement, the guide rod limits the rotation of the pressing part. (3) When the double-action cup liner and the ball head prosthesis reach the contact point, apply a little force until the double-action cup liner and the ball head prosthesis reach the ready-to-assemble state. At this time, the center of gravity of the device is placed on the extension line of the center of the chassis, and the device as a whole reaches the most stable state. (4) Adjust the torque by sliding the torque rod left and right, and apply pressure to the clamping part through the torque rod until the air between the double-action cup liner and the ball head prosthesis is exhausted, and the assembly is completed.

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