Acetabular cup taking-out device for hip joint revision surgery

Abstract

The utility model discloses an acetabular cup taking-out device for a hip joint revision operation, and belongs to the technical field of medical instruments. Comprising a grab handle, a power input shaft and an output shaft are rotationally arranged on the two sides of the grab handle respectively and fixedly connected, a positioning ball capable of rotating along with the output shaft is arranged at the end of the output shaft, a movable arc-shaped blade is detachably arranged on the outer side of the positioning ball, and the arc-shaped blade can turn to the bottom of the positioning ball. A blade adjusting assembly capable of driving the arc-shaped blade to move is arranged on the output shaft. The acetabular cup taking-out device for the hip joint revision operation is simple in structure and convenient to operate, the complex hip joint revision operation is simplified, accurate cutting with a predictable result can be conducted by designing the arc-shaped blade with the replaceable size, meanwhile, bone loss can be reduced to the maximum extent, the operation effect is improved, and the hip joint revision operation efficiency is improved. The risk of acetabular fracture in the operation is also reduced, and the practicability is high.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically a device for removing the acetabular cup in hip revision surgery. Background Technology

[0002] With the widespread adoption and implementation of total hip replacement surgery, many patients with hip joint diseases have benefited from the procedure and hope. The number of hip replacement surgeries has increased year by year, but so has the number of revision surgeries. There are many reasons for hip revision surgery, such as prosthesis loosening, joint instability, and joint infection. During revision surgery, if the acetabular cup prosthesis dislocates or surrounding tissues become infected, it is necessary to remove the acetabular cup prosthesis from the patient's acetabular fossa. Currently, the main method for removing the acetabular cup prosthesis is by directly removing it using a chisel or osteotome with a curved lever, which can easily damage the acetabular bone bed.

[0003] To address this, we have developed a novel acetabular cup removal device for hip revision surgery. This device effectively simplifies complex hip revision surgeries. By designing a replaceable size curved blade, it enables precise cutting with predictable results, reducing the risk of acetabular fracture during surgery. Utility Model Content

[0004] The purpose of this invention is to provide a device for removing the acetabular cup in hip revision surgery to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A device for removing an acetabular cup in hip revision surgery includes a handle, with a power input shaft and an output shaft rotatably mounted on both sides of the handle. The power input shaft and the output shaft are fixedly connected. A positioning ball that can rotate with the output shaft is provided at the end of the output shaft. A movable arc-shaped blade is detachably mounted on the outside of the positioning ball. The arc-shaped blade can be turned to the bottom of the positioning ball. A blade adjustment assembly that can drive the arc-shaped blade to move is provided on the output shaft.

[0007] As a further preferred embodiment of this utility model: the positioning ball includes a central shaft fixedly connected to the output shaft, with limit baffles rotatably connected to both sides of the central shaft, and a rotating outer shell fitted on the outside of the central shaft fixedly connected between the limit baffles. The rotating outer shell does not contact the central shaft, and a movable opening is provided on the upper side of the rotating outer shell. The output shaft passes through the movable opening and is connected to the central shaft. The output shaft and the movable opening can move relative to each other. Two blade seats are symmetrically arranged on the upper side of the rotating outer shell, and the ends of the arc-shaped blades are detachably connected to the blade seats.

[0008] As a further preferred embodiment of this utility model: the blade adjustment assembly includes a slide bar, a groove is provided on the surface of the output shaft, the slide bar is slidably disposed in the groove, a protruding paddle is provided at the upper end of the slide bar, and the lower end of the slide bar is hinged to a hinge shaft that is rotatably disposed in the movable opening.

[0009] As a further preferred embodiment of this utility model: a fixed cavity is provided inside the blade holder, an insertion port communicating with the fixed cavity is provided at the bottom of the blade holder, an insertion piece is provided at the end of the arc-shaped blade, the insertion piece passes through the insertion port and is located in the fixed cavity, a locking block is slidably provided in the fixed cavity, one end of the locking block is inserted into the insertion piece, a limit spring is provided between the other end of the locking block and the inner wall of the fixed cavity, and a push plate fixedly connected to the locking block is slidably provided at the upper end of the blade holder.

[0010] As a further preferred embodiment of this utility model: a movable opening is provided on the lower side of the rotating outer shell, and a positioning head is fixedly connected to the lower end of the central shaft. The positioning head passes through the movable opening but does not contact the movable opening, and the positioning head and the movable opening can move relative to each other.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This acetabular cup removal device for hip revision surgery features a rotating outer shell and an arc-shaped blade. A small motor or other power device is connected to the end of the power input shaft. By holding the handle and grip of the power device, a positioning ball is placed into the acetabular cup prosthesis. The power input and output shafts are driven to rotate, causing the positioning ball to rotate within the acetabular cup prosthesis, while the arc-shaped blade rotates around the acetabular cup prosthesis. As the positioning ball rotates laterally, the arc-shaped blade rotates and cuts around the acetabular cup frame. The cutting stops at intervals, and the adjustment component moves the arc-shaped blade downwards, then it cuts again. When the arc-shaped blade moves to the bottom and has been rotating and cutting for a certain period of time, the acetabular cup prosthesis can be separated from the acetabulum. Lifting the removal device upwards allows the arc-shaped blade and positioning ball to simultaneously clamp out the prosthesis, enabling rapid separation of the acetabular cup prosthesis, shortening the operation time, and simplifying complex hip revision surgery.

[0013] By designing a detachable and replaceable curved blade, the device can be adapted to different models of acetabular cup prostheses, thus increasing its applicability. It can achieve precise cutting with predictable results while minimizing bone loss and improving surgical outcomes.

[0014] By designing a blade adjustment component, the slider can be moved up or down by flicking the protruding paddle, which in turn drives the rotating housing and the arc-shaped blade to rotate up or down, allowing the arc-shaped blade to return to a horizontal position or move downward in the cutting gap. This facilitates the replacement of the arc-shaped blade and the cutting operation, providing high flexibility.

[0015] In summary, this acetabular cup removal device for hip revision surgery has a simple structure and is easy to operate, simplifying complex hip revision surgery. By designing an interchangeable size arc-shaped blade, it can perform precise cutting with predictable results, while also minimizing bone loss, improving surgical outcomes, and reducing the risk of acetabular fracture during surgery. It is highly practical. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the acetabular cup removal device for hip revision surgery according to this utility model. Figure 1 ;

[0017] Figure 2 for Figure 1 Enlarged schematic diagram of the structure at the center positioning ball;

[0018] Figure 3 This is a three-dimensional structural diagram of the acetabular cup removal device for hip revision surgery of this utility model without the rotating outer shell;

[0019] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at the central axis;

[0020] Figure 5 This is a three-dimensional structural diagram of the acetabular cup removal device for hip revision surgery according to this utility model. Figure 2 ;

[0021] Figure 6 for Figure 5 Enlarged schematic diagram of the structure at the center positioning ball;

[0022] Figure 7 This is a schematic diagram of the mating structure between the arc-shaped blade and the blade holder.

[0023] In the diagram: 1. Handle; 2. Power input shaft; 3. Output shaft; 4. Slide bar; 5. Slide groove; 6. Raised paddle; 7. Positioning ball; 8. Blade holder; 9. Curved blade; 10. Positioning head; 11. Rotating housing; 12. Limiting stop housing; 13. Movable port; 14. Hinge shaft; 15. Central shaft; 16. Insert; 17. Fixed cavity; 18. Push plate; 19. Locking block; 20. Limiting spring; 21. Insert plate. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0025] Please see Figure 1-7 This embodiment provides a device for removing an acetabular cup in hip revision surgery, including a handle 1. A power input shaft 2 and an output shaft 3 are rotatably mounted on both sides of the handle 1, respectively. The power input shaft 2 and the output shaft 3 are fixedly connected. A positioning ball 7, which rotates with the output shaft 3, is provided at the end of the output shaft 3. A movable arc-shaped blade 9 is detachably mounted on the outside of the positioning ball 7, and the arc-shaped blade 9 can rotate to the bottom of the positioning ball 7. Specifically, as shown... Figure 2 as well as Figure 6 As shown, the positioning ball 7 includes a central shaft 15 fixedly connected to the output shaft 3. Limiting shells 12 are rotatably connected to both sides of the central shaft 15. A rotating outer shell 11, fitted onto the outside of the central shaft 15, is fixedly connected between the limiting shells 12. The rotating outer shell 11 does not contact the central shaft 15. A movable opening 13 is provided on the upper side of the rotating outer shell 11. The output shaft 3 passes through the movable opening 13 and is connected to the central shaft 15. The output shaft 3 and the movable opening 13 can move relative to each other. Two blade holders 8 are symmetrically arranged on the upper side of the rotating outer shell 11. The ends of the arc-shaped blades 9 are detachably connected to the blade holders 8. Figure 7 As shown, in order to disassemble the arc-shaped blade 9, it is only necessary to clamp and fix the end of the arc-shaped blade 9 in the blade holder 8. This technology should be a conventional structure familiar to those skilled in the art. In this embodiment, a fixing cavity 17 is provided inside the blade holder 8, and an insertion port 16 communicating with the fixing cavity 17 is provided at the bottom of the blade holder 8. An insertion piece 21 is provided at the end of the arc-shaped blade 9. The insertion piece 21 passes through the insertion port 16 and is located in the fixing cavity 17. A locking block 19 is slidably provided in the fixing cavity 17. One end of the locking block 19 is inserted into the insertion piece 21, and a limit spring 20 is provided between the other end of the locking block 19 and the inner wall of the fixing cavity 17. A push plate 18 fixedly connected to the locking block 19 is slidably provided at the upper end of the blade holder 8.

[0026] To facilitate adjustment of the position of the curved blade 9, enabling it to cut and remove the acetabular cup prosthesis, a blade adjustment assembly capable of driving the curved blade 9 is also provided on the output shaft 3. Preferably, as... Figure 1 As shown, the blade adjustment assembly includes a slide bar 4, a groove 5 is provided on the surface of the output shaft 3, the slide bar 4 is slidably disposed in the groove 5, a protruding paddle 6 is provided at the upper end of the slide bar 4, and the lower end of the slide bar 4 is hinged to a hinge shaft 14 that is rotatably disposed in the movable opening 13.

[0027] In addition, in order to achieve accurate positioning of the positioning ball 7 within the prosthesis, such as Figure 2 as well as Figure 4 As shown, a movable opening 13 is provided on the lower side of the rotating housing 11, and a positioning head 10 is fixedly connected to the lower end of the central shaft 15. The positioning head 10 passes through the movable opening 13 and does not contact the movable opening 13. The positioning head 10 and the movable opening 13 can move relative to each other.

[0028] It should be noted that in practical applications, the curved blade 9 can be a serrated blade, which facilitates rotary cutting. This is common knowledge in orthopedic surgery that is familiar to those skilled in the art, and will not be elaborated further.

[0029] In use, a small motor or other power device is connected to the end of the power input shaft 2. Holding the power device handle and grip 1, the positioning ball 7 is placed into the acetabular cup prosthesis. By driving the power input shaft 2 and output shaft 3 to rotate, the positioning ball 7 rotates within the acetabular cup prosthesis, while the arc-shaped blade 9 rotates around the acetabular cup prosthesis to cut. During cutting, the cutting needs to be stopped every once in a while. With the output shaft 3 stopped rotating, the protruding paddle 6 is pushed down to make the arc-shaped blade 9 move downward and press against the tissue around the acetabular cup frame again, and then the cutting is repeated. This process is repeated to make the arc-shaped blade 9 move downward continuously. When the arc-shaped blade 9 rotates to the bottom, the acetabular cup prosthesis can be separated from the acetabular fossa. The removal device is then lifted upward, and the arc-shaped blade 9 and the positioning ball 7 can simultaneously clamp out the prosthesis, which can quickly separate the acetabular cup prosthesis. It should be noted that, due to the friction of the surrounding tissue on the arc-shaped blade 9 and the influence of the friction of the groove 5 on the slide bar 4, the arc-shaped blade 9 will not move upward automatically when rotating, which will not affect the cutting effect. It is common knowledge familiar to those skilled in the art that it still needs to be manually reset after cutting, and this application will not elaborate further.

[0030] It should be noted that the above embodiments are only specific and clear descriptions of the technical solutions and features of this application. Solutions or features that are prior art or common knowledge to those skilled in the art will not be described in detail in the above embodiments.

[0031] Furthermore, the technical solutions of this application are not limited to the above embodiments. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A device for removing an acetabular cup in hip revision surgery, characterized in that, Includes a handle (1), on both sides of the handle (1) are rotatably provided a power input shaft (2) and an output shaft (3), the power input shaft (2) and the output shaft (3) are fixedly connected, the end of the output shaft (3) is provided with a positioning ball (7) that can rotate with the output shaft (3), the outside of the positioning ball (7) is detachably provided with a movable arc blade (9), the arc blade (9) can turn to the bottom of the positioning ball (7), and the output shaft (3) is provided with a blade adjustment assembly that can drive the arc blade (9) to move.

2. The acetabular cup removal device for hip revision surgery according to claim 1, characterized in that, The positioning ball (7) includes a central shaft (15) fixedly connected to the output shaft (3). Limiting shells (12) are rotatably connected to both sides of the central shaft (15). A rotating shell (11) fitted on the outside of the central shaft (15) is fixedly connected between the limiting shells (12). The rotating shell (11) does not contact the central shaft (15). An movable opening (13) is provided on the upper side of the rotating shell (11). The output shaft (3) passes through the movable opening (13) and is connected to the central shaft (15). The output shaft (3) and the movable opening (13) can move relative to each other. Two blade seats (8) are symmetrically arranged on the upper side of the rotating shell (11). The end of the arc-shaped blade (9) is detachably connected to the blade seat (8).

3. The acetabular cup removal device for hip revision surgery according to claim 2, characterized in that, The blade adjustment assembly includes a slide bar (4), a groove (5) is provided on the surface of the output shaft (3), the slide bar (4) is slidably disposed in the groove (5), a protruding paddle (6) is provided at the upper end of the slide bar (4), and the lower end of the slide bar (4) is hinged to a hinge shaft (14) rotatably disposed in the movable opening (13).

4. The acetabular cup removal device for hip revision surgery according to claim 2, characterized in that, The blade holder (8) has a fixed cavity (17) inside. The bottom of the blade holder (8) has an insertion port (16) communicating with the fixed cavity (17). The end of the arc-shaped blade (9) has an insert (21). The insert (21) passes through the insertion port (16) and is located in the fixed cavity (17). A locking block (19) is slidably arranged in the fixed cavity (17). One end of the locking block (19) is inserted into the insert (21). A limit spring (20) is provided between the other end of the locking block (19) and the inner wall of the fixed cavity (17). A push plate (18) is slidably arranged at the upper end of the blade holder (8) and fixedly connected to the locking block (19).

5. The acetabular cup removal device for hip revision surgery according to claim 2, characterized in that, The rotating outer shell (11) has an opening (13) on its lower side. A positioning head (10) is fixedly connected to the lower end of the central shaft (15). The positioning head (10) passes through the opening (13) and does not contact the opening (13). The positioning head (10) and the opening (13) can move relative to each other.

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