Hip joint prosthesis revision extractor

Abstract

The hip joint prosthesis revision extractor comprises a sliding weight rod, a sliding weight is connected to the sliding weight rod in a sliding mode, a check block is connected to the upper end of the sliding weight rod, and a femoral prosthesis connecting mechanism is connected to the lower end of the sliding weight rod. Through cooperation of the sliding weight rod, the check block, the femoral prosthesis connecting mechanism, the sliding weight and the like, when the femoral prosthesis is used in an operation, the femoral prosthesis connecting mechanism is connected with a femoral stem according to the actual condition of a patient and the use state of the femoral stem, the femoral prosthesis fixing mechanism is used for fixing, and the sliding weight at the rear end is held by a hand to enable the sliding weight to slide towards the check block at the tail end of the sliding weight rod; the impact force drives the sliding weight rod to move backwards and drives the femoral prosthesis connecting mechanism to move backwards, so that the femoral stem is withdrawn from the femur, and the extractor has the characteristics of convenience in use, small size, simplicity in operation, convenience in operation and capability of saving operation time.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a hip joint prosthesis revision and removal device. Background Technology

[0002] If dislocation, acetabular wear, infection, or femoral stem prosthesis fracture occurs after total hip arthroplasty, revision surgery may be necessary. When the femoral prosthesis is stably fixed, separation of the femoral stem and cemented shell becomes extremely difficult, making the ease and speed of the surgical procedure crucial. The ease and stability of prosthesis removal significantly impacts the quality of the surgery and ensures a smooth postoperative recovery. The upper end of the femoral stem forms the circular body connecting to the femoral head prosthesis, while the lower side of this circular body is the transition section, culminating in the stem that inserts into the femur.

[0003] In existing techniques, separating and removing the femoral stem and femur is quite difficult. During the surgery, the surgeon needs to clamp the femoral prosthesis according to the actual situation. Current revision hip surgeries are inconvenient to clamp the prosthesis, and the operation time is too long. If the clamping is not tight enough, the instruments need to be reinstalled on the prosthesis, wasting valuable time during the operation. Moreover, the existing prosthesis removal device is large and complicated to operate during the operation, which not only affects the surrounding bone of the patient, but also causes great inconvenience to the surgeon. Summary of the Invention

[0004] The purpose of this invention is to solve the problems mentioned in the background art regarding the inconvenience of prosthesis clamping in existing revision hip surgery, the excessive operation time, or the waste of valuable intraoperative time due to insufficient clamping requiring reinstallation of instruments onto the prosthesis.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A hip joint prosthesis revision and removal device includes a sliding hammer rod with a sliding hammer slidably connected to it, a stop block connected to the upper end of the sliding hammer rod, and a femoral prosthesis connection mechanism connected to the lower end of the sliding hammer rod.

[0006] Preferably, the femoral prosthesis connection mechanism includes a limiting component, the limiting component including a limiting plate located on the lower side of the circular body, the lower end of the sliding hammer rod having a slot adapted to the circular body, and the limiting plate being movable along the axial direction of the sliding hammer rod.

[0007] Preferably, a connecting plate is fixedly connected to the upper side of the limiting plate, and a connecting sleeve is fixedly connected to the upper end of the connecting plate. The femoral prosthesis connection mechanism also includes a threaded rod, which is fixed to the lower end of the sliding hammer rod, and the connecting sleeve is threadedly connected to the threaded rod.

[0008] Preferably, an open ring is fixed between the two connecting plates, and the inner side of the open ring has an arc-shaped groove that conforms to the circular body.

[0009] Preferably, the open ring has an extension.

[0010] Preferably, the inlet end of the extension has a guide slope.

[0011] Preferably, the limiting component is detachably connected to the threaded rod.

[0012] Preferably, the slot is a multi-stage stepped slot.

[0013] Preferably, a limiting post is fixed on the connecting sleeve, and a limiting groove is formed on the limiting post.

[0014] Preferably, the surface of the slide hammer is provided with a circular groove for easy gripping.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes a combination of a sliding hammer rod, a stop block, a femoral prosthesis connection mechanism, and a sliding hammer. During surgery, depending on the patient's actual condition and the condition of the femoral stem, the femoral prosthesis connection mechanism is connected to the femoral stem, and the femoral prosthesis fixation mechanism is used for fixation. The sliding hammer is held at the rear end and slid towards the stop block at the end of the sliding hammer rod, thereby striking the stop block. The impact force causes the sliding hammer rod to move backward, which in turn moves the femoral prosthesis connection mechanism backward, thus removing the femoral stem from the femur. The extraction device is convenient to use, small in size, simple to operate, facilitates surgery, and saves surgical time.

[0016] By combining a limiting plate and a hexagonal rod, it can be adapted to femoral stems with flat and conical transition parts, respectively, thus solving the installation problem of easy rotation of the limiting plate for conical types.

[0017] The slot is designed with a multi-stage stepped groove to match circular bodies of different diameters; the limiting component and the threaded rod are detachably connected, and only by replacing the limiting plate of different specifications, it can adapt to femoral stems with different transition thicknesses.

[0018] The femoral stem is axially fixed from both the top and bottom directions by the fit between the slot and the circular body, and by the fit between the limiting plate and the transition part of the circular body, thus preventing it from moving up and down.

[0019] The extension of the open ring first contacts the circular body, and the guide slope guides the circular body in. At the same time, when the arc groove contacts the circular body, it can automatically align with the axis, ensuring that the slot and the circular body are precisely connected. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the limiting component of the present invention.

[0023] Figure 3 This is a schematic diagram of the slot and the opening ring of the present invention.

[0024] Figure 4 This is a schematic diagram of the transition section of the present invention being a cone.

[0025] Figure number explanation: 1. Sliding hammer rod; 2. Sliding hammer; 21. Circular groove; 3. Stop block; 4. Femoral prosthesis connection mechanism; 41. Limiting component; 411. Limiting plate; 412. Connecting plate; 413. Connecting sleeve; 42. Slot; 43. Threaded rod; 44. Opening ring; 441. Arc groove; 442. Extension; 443. Guide slope; 45. Limiting post; 46. Limiting groove; 5. Femoral stem; 51. Circular body; 52. Transition part; 53. Stem body. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings.

[0027] The following description is intended to disclose the invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0028] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing this invention and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this invention.

[0029] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0030] Please see Figures 1-4 A hip joint prosthesis revision and removal device includes a sliding hammer rod 1, a sliding hammer 2 slidably connected to the sliding hammer rod 1, a circular groove 21 for easy gripping on the surface of the sliding hammer 2, a stop block 3 connected to the upper end of the sliding hammer rod 1 to block the sliding hammer 2, and a femoral prosthesis connection mechanism 4 connected to the lower end of the sliding hammer rod 1 for fixing to the femoral prosthesis. The femoral prosthesis is a femoral stem 5, which includes a circular body 51 connecting to the femoral head prosthesis, a transition portion 52, and a stem body 53 inserted into the femur. The transition portion 52 has two main types: flat and conical.

[0031] The femoral prosthesis connection mechanism 4 includes a limiting component 41, which includes a limiting plate 411 located on the lower side of the circular body 51. One side of the limiting plate 411 fits the connection between the circular body 51 and the transition part 52. The lower end of the sliding hammer rod 1 is provided with a slot 42 adapted to the circular body 51. The limiting plate 411 can move along the axial direction of the sliding hammer rod 1. The slot 42 and the limiting plate 411 fix the femoral stem 5 in the axial direction, thereby facilitating stability. The limiting plate 411 first moves to the lower side of the circular body 51, and then the sliding hammer rod 1 is moved down so that the circular body 51 is inserted into the slot 42.

[0032] A connecting plate 412 is fixedly connected to the upper side of the limiting plate 411, and a connecting sleeve 413 is fixedly connected to the upper end of the connecting plate 412. The femoral prosthesis connection mechanism 4 also includes a threaded rod 43, which is fixed to the lower end of the sliding hammer rod 1. The connecting sleeve 413 is threadedly connected to the threaded rod 43, and the distance between the limiting plate 411 and the slot 42 is adjusted by the connecting sleeve 413.

[0033] like Figure 2 and 3 As shown, the flat body has flat surfaces on both sides, and one side of the limiting plate 411 contacts the flat surface, preventing the limiting plate 411 from rotating in the circumferential direction. An open ring 44 is fixed between the two connecting plates 412, and the inner side of the open ring 44 has an arc-shaped groove 441 that matches the circular body 51. The open ring 44 has an extension 442, which first contacts the circular body 51 to maintain stability and facilitates the connection between the limiting plate 411 and the flat body.

[0034] The inlet end of the extension 442 has a guide slope 443, which facilitates the entry of the circular body 51 into the opening ring 44. When the arc groove 441 contacts the circular body 51, the limiting plate 411 is located at the center of the transition section 52, which facilitates the alignment of the subsequent slot 42 with the circular body 51.

[0035] The diameter of the circular body 51 and the thickness of the transition portion 52 of different femoral stems 5 are different. In order to accommodate more femoral stems 5, the limiting component 41 and the threaded rod 43 are detachably connected. The connecting sleeve 413 on the limiting component 41 remains unchanged, while the limiting plate 411 is different. The threaded rod 43 is connected to different limiting components 41 to accommodate different femoral stems 5.

[0036] Slot 42 is a multi-stage stepped groove, which is a circular groove with a diameter that gradually decreases from bottom to top.

[0037] like Figure 3 and 4 As shown, when the transition part 52 is a cone, the limiting plate 411 can rotate in the circumferential direction, which is not conducive to installation. Therefore, a limiting post 45 is fixed on the connecting sleeve 413, and a limiting groove 46 is opened on the limiting post 45. The limiting groove 46 is hexagonal, but it can also be other polygonal shapes. The limiting member 41 can be inserted to limit the position. The limiting plate 411 is located at the center of the transition part 52. The hexagonal rod is existing technology and is not shown in the figure. By inserting the hexagonal rod into the limiting groove 46, the limiting member 41 can be kept stationary to adapt to the case where the transition part 52 is a cone.

[0038] When in use, if the transition part 52 is flat, first place the limiting plate 411 within the height range of the transition part 52, then move the femoral prosthesis connecting mechanism 4 laterally so that the circular body 51 enters the extension part 442 and rotates in the circumferential direction so that the limiting plate 411 is aligned with the plane and finally contacts the arc groove 441. At this time, the limiting plate 411 is located at the center of the transition part 52, the limiting component 41 cannot rotate in the circumferential direction, and the axis of the circular body 51 coincides with the axis of the slot 42. Then, rotate the sliding hammer rod 1 so that the sliding hammer rod 1 and the threaded rod 43 descend together, and finally the circular body 51 enters the matching circular groove. Stop when the sliding hammer rod 1 rotates continuously. At this time, the upper end of the limiting plate 411 fits with the connection between the circular body 51 and the transition part 52, so that the limiting plate 411 remains stable in the axial direction.

[0039] When the transition part 52 is a cone, the limiting plate 411 is first positioned within the height range of the transition part 52. Then, the femoral prosthesis connecting mechanism 4 is moved laterally so that the circular body 51 enters the extension part 442 and contacts the arc groove 441. At this time, the limiting plate 411 is located at the center of the transition part 52. The hexagonal rod is inserted into the limiting groove 46 so that the limiting component 41 remains stationary. Then, the sliding hammer rod 1 is rotated so that the sliding hammer rod 1 and the threaded rod 43 descend together. Finally, the circular body 51 enters the matching circular groove. The sliding hammer rod 1 stops rotating continuously. At this time, the upper end of the limiting plate 411 fits against the connection between the circular body 51 and the transition part 52, so that the limiting plate 411 remains axially stable. Holding the rear sliding hammer, slide the hammer towards the stop 3 at the end of the hammer rod, thereby striking the stop 3. The impact force drives the hammer rod to move backward, which in turn drives the femoral prosthesis connection mechanism 4 to move backward, thereby causing the femoral stem 5 to exit the femur. This method is convenient to use, simple to operate, facilitates surgery, and can save surgical time.

[0040] After the femoral stem 5 is removed, when it is necessary to separate the femoral prosthesis connecting mechanism 4 from the femoral stem 5, the fixed connecting sleeve 413 remains stationary, the sliding hammer rod 1 is rotated to separate the circular body 51 from the slot 42, and then moved laterally to complete the separation.

[0041] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any variations or modifications may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A hip joint prosthesis revision removal device, characterized in that, It includes a sliding hammer rod (1), on which a sliding hammer (2) is slidably connected, a stop block (3) is connected to the upper end of the sliding hammer rod (1), and a femoral prosthesis connection mechanism (4) is connected to the lower end of the sliding hammer rod (1).

2. The hip joint prosthesis revision removal device according to claim 1, characterized in that: The femoral prosthesis connection mechanism (4) includes a limiting component (41), which includes a limiting plate (411) located on the lower side of the circular body (51). The lower end of the sliding hammer rod (1) is provided with a slot (42) adapted to the circular body (51), and the limiting plate (411) can move along the axial direction of the sliding hammer rod (1).

3. The hip joint prosthesis revision removal device according to claim 2, characterized in that: The upper side of the limiting plate (411) is fixedly connected to a connecting plate (412), and the upper end of the connecting plate (412) is fixedly connected to a connecting sleeve (413). The femoral prosthesis connection mechanism (4) also includes a threaded rod (43), which is fixed to the lower end of the sliding hammer rod (1). The connecting sleeve (413) is threadedly connected to the threaded rod (43).

4. The hip joint prosthesis revision removal device according to claim 3, characterized in that: An open ring (44) is fixed between the two connecting plates (412), and the inner side of the open ring (44) has an arc groove (441) that matches the circular body (51).

5. The hip joint prosthesis revision removal device according to claim 4, characterized in that: The open ring (44) has an extension (442).

6. The hip joint prosthesis revision removal device according to claim 5, characterized in that: The inlet end of the extension (442) has a guide slope (443).

7. The hip joint prosthesis revision removal device according to claim 3, characterized in that: The limiting component (41) is detachably connected to the threaded rod (43).

8. The hip joint prosthesis revision removal device according to claim 7, characterized in that: The slot (42) is a multi-stage stepped slot.

9. The hip joint prosthesis revision removal device according to claim 8, characterized in that: A limiting post (45) is fixed on the connecting sleeve (413), and a limiting groove (46) is formed on the limiting post (45).

10. The hip joint prosthesis revision removal device according to claim 1, characterized in that: The surface of the slide (2) is provided with a circular groove (21) for easy gripping.

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