An eccentric acetabular liner and a tool for processing an eccentric acetabular liner

Abstract

The present application relates to the field of medical devices, and in particular to an eccentric acetabular liner and a tool for processing an eccentric acetabular liner. An eccentric acetabular liner includes a hemispherical acetabular liner body and a cylindrical extension block fixed to one side of the plane of the acetabular liner body. The extension block is tilted away from the end of the acetabular liner body, and the length of the extension block in the axial direction gradually decreases from one side of the extension block to the other side. The extension block is provided with a spherical receiving groove connected to the acetabular liner body at one end away from the acetabular liner body, and the center of the receiving groove is eccentric to the center of the acetabular liner body. The present application has the effect of reducing the probability of dislocation of the ball head from the acetabular liner after installation.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to an eccentric acetabular liner and a tool for processing the eccentric acetabular liner. Background Art

[0002] Hip replacement, also known as artificial hip replacement, is a procedure in which an artificial prosthesis, consisting of the femoral part and the acetabulum part, is fixed to normal bone using bone cement and screws to replace the diseased joint and reconstruct the normal function of the patient's hip joint.

[0003] However, a common complication after hip replacement surgery is postoperative dislocation, which occurs when the ball head dislocates from the acetabular liner from the posterolateral side of the body. This can cause further pain to the patient and, in severe cases, can lead to deformity and dysfunction. Therefore, reducing the probability of dislocation of the ball head from the acetabular liner after installation has always been a key focus in prosthesis design. Summary of the Invention

[0004] In order to reduce the probability of dislocation of the ball head from the acetabular liner after installation, the present application provides an eccentric acetabular liner.

[0005] In a first aspect, the present application provides an eccentric acetabular liner, which adopts the following technical solution:

[0006] An eccentric acetabular liner comprises a hemispherical acetabular liner body and a cylindrical extension block fixed to one side of the plane of the acetabular liner body, wherein the extension block is tilted away from the end of the acetabular liner body, and the length of the extension block in the axial direction gradually decreases from one side of the extension block to the other side. A spherical receiving groove connected to the acetabular liner body is formed at the end of the extension block away from the acetabular liner body, and the center of the receiving groove is eccentric to the center of the acetabular liner body.

[0007] By adopting the above technical solution, the extension block significantly increases the angle and area of ​​coverage of the machined receiving groove around the ball head, improving the secureness of the ball head after installation and reducing the probability of dislocation from the acetabular liner. Furthermore, during installation, the extension block can be installed at its longest position on the posterolateral side of the body, where it shields the ball head and further reduces the probability of posterolateral dislocation.

[0008] Optionally, one end of the acetabular liner body away from the extension block is flat, forming a marking surface.

[0009] By adopting the above technical solution, the marking surface can be used to mark the size and model of the acetabular liner, so that the acetabular liner of appropriate size can be selected according to the needs during use.

[0010] Optionally, a plurality of limiting blocks for cooperating with the acetabulum cup are fixedly connected to the outer wall of the extension block, and the plurality of limiting blocks are arranged at intervals around the axis of the extension block.

[0011] By adopting the above technical solution, the limiting block is used to cooperate with the acetabular cup, so as to facilitate the installation and positioning of the acetabular liner and the acetabular cup during surgery.

[0012] Optionally, a marking line is provided on a side of the extension block away from the acetabular liner body, and the marking line is located at the longest axial length of the extension block.

[0013] By adopting the above technical solution, the doctor can directly see the longest axial length of the extension block during surgery, so that the longest part can be installed on the posterolateral side of the human body, which makes installation and positioning very convenient.

[0014] In a second aspect, the present application provides a tool for machining an eccentric acetabular liner, which adopts the following technical solution:

[0015] A tool for processing an eccentric acetabular liner, used for processing the above-mentioned eccentric acetabular liner, characterized in that it includes a mounting seat, the mounting seat includes a mounting tube, one end of the mounting tube is provided with a limit groove for a limit block to be embedded in, when the end of the extension block away from the acetabular liner body is placed in the mounting tube, the marking surface is parallel to the end face of the mounting tube.

[0016] By adopting the above technical solution, during processing, the end of the extension block away from the acetabular liner body can be directly placed into the installation tube, and the limit block will be embedded in the limit groove. At this time, the marking surface on the acetabular liner will be parallel to the end face of the installation tube. The installation tube can be directly placed vertically in the appropriate position, and the marking surface will be placed horizontally. The staff can directly mark the marking surface.

[0017] Optionally, the mounting seat also includes a fixed shaft, one end of the mounting tube is connected to one end of the fixed shaft, the axis of the mounting tube is inclined to the axis of the fixed shaft, and when the acetabulum liner body is placed in the mounting tube, the side of the extension block away from the acetabulum liner body is parallel to the end of the fixed shaft away from the mounting tube.

[0018] By adopting the above technical solution, when it is necessary to machine a receiving groove for the end of the extension block away from the acetabular liner body, the acetabular liner body can be directly installed in the installation tube so that the limit block is embedded in the limit groove. At this time, the side of the extension block away from the acetabular liner body will be parallel to the end of the fixed axis away from the installation axis. Then, the fixed axis is installed on a lathe, so that the end of the extension block away from the acetabular liner body can be parallel to the horizontal plane, which makes it convenient to machine the receiving groove directly on the lathe at one time.

[0019] Optionally, a positioning groove is formed at one end of the fixing shaft facing the mounting tube.

[0020] By adopting the above technical solution, since the axis of the mounting tube is inclined to the axis of the fixed shaft, the positioning groove can play a positioning role. When the acetabular liner body is installed on the mounting tube, when the longest side of the extension block faces the positioning groove, the end of the extension block away from the acetabular liner body is flush with the end of the fixed shaft away from the mounting tube, which is convenient for installation and positioning of the extension block during processing.

[0021] Optionally, the mounting seat further comprises a screw cap for fixing the position of the acetabular liner body in the mounting tube, the screw cap is threadedly connected to the mounting tube, and a hole is provided on the screw cap for the acetabular liner body to pass through.

[0022] By adopting this technical solution, when the acetabular liner body is placed in the mounting barrel, the stopper can be snapped into the stopper groove, thereby fixing the relative position of the acetabular liner body and the mounting barrel. The screw cap is then screwed onto the mounting barrel. At this point, the stopper is clamped between the mounting barrel and the screw cap, thus fixing the acetabular liner body in place and preventing it from sliding off the mounting barrel under external forces. The extension block protrudes from the avoidance hole, allowing workers to directly begin opening the receiving slot at the end of the extension block.

[0023] Optionally, the mounting seat also includes a fixing plate for fixing the position of the fixed shaft on the workbench, the fixing plate includes a placement plate for fixing on the workbench and a mounting plate fixed to one end of the placement plate, the fixed shaft is installed on the mounting plate, and the placement plate and the mounting plate are set at an angle.

[0024] By adopting the above technical solution, when it is necessary to mark the extension block, the bone knife shaft can be directly installed on the mounting plate, and then the placement plate can be installed on the workbench of the marking equipment, and the acetabular liner body can be installed in the mounting tube, and the marking line can be engraved on the extension block through the marking equipment.

[0025] Optionally, the angle between the placement plate and the mounting plate is 85-165 degrees.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] The provision of the extension block allows for the production of a larger volume accommodating groove, thereby increasing the angle and area of ​​the accommodating groove wrapping around the ball head, thereby increasing the stability of the ball head after installation and reducing the probability of the ball head dislocating from the acetabular liner after installation. Simultaneously, during installation, the extension block is tilted away from the acetabular liner body, making it easier for the doctor to install the longest side of the extension block on the posterolateral side of the human body. The longer portion of the extension block will shield the ball head, further reducing the probability of the ball head dislodging from the posterolateral side of the human body.

[0028] The setting of the tooling makes it easy to process the eccentric acetabular liner without being affected by the eccentricity of the eccentric acetabular liner itself, making the processing more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of the overall eccentric acetabular liner of the present application.

[0030] Figure 2 This is a schematic diagram of the overall structure of the eccentric acetabular liner of the present application from another perspective.

[0031] Figure 3 This is a structural diagram of the eccentric acetabular liner when it is installed on the tooling when marking on the marking surface.

[0032] Figure 4 It is a structural diagram showing the eccentric acetabular liner installed on the tooling when machining the accommodating groove.

[0033] Figure 5 yes Figure 4 Schematic cross-section diagram in .

[0034] Figure 6 In order to reflect the structural diagram of the eccentric acetabular liner installed on the tooling when processing the marking line.

[0035] Explanation of the accompanying reference numerals: 1. Acetabular liner body; 11. Marking surface; 2. Extension block; 21. Marking line; 22. Limit block; 23. Anti-slip edge; 3. Accommodation groove; 4. Mounting seat; 41. Mounting cylinder; 411. Limiting groove; 42. Fixed shaft; 421. Positioning groove; 43. Screw cover; 431. Avoidance hole; 44. Fixing plate; 441. Placement plate; 442. Mounting plate; 443. Pre-installation hole. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-6 This application is described in further detail.

[0037] The embodiment of the present application discloses an eccentric acetabular liner. Figure 1 and Figure 2The eccentric acetabular liner includes a hemispherical acetabular liner body 1 and a cylindrical extension block 2 integrally fixed to one side of the plane of the acetabular liner body 1. The extension block 2 is tilted at the end away from the acetabular liner body 1. Specifically, the length of the extension block 2 gradually decreases from one side to the other. A receiving groove 3 for receiving a ball head is provided at the end of the extension block 2 away from the acetabular liner body 1. The receiving groove 3 is spherical and is opened on the acetabular liner body 1. The center of the receiving groove 3 is eccentric to the center of the acetabular liner body 1. During installation, the longest side of the extension block 2 can be directly installed above the posterolateral side of the human body, and the ball head can be installed in the receiving groove 3. When the ball head is dislocated from the receiving groove 3 due to force, the longest side of the extension block 2 will block the ball head, preventing the ball head from passing through the extension block 2 and dislocating, thereby greatly reducing the probability of ball head dislocation. The extension block 2 also increases the space within the newly created accommodating slot 3, without causing any increased damage to the body. This increases the angle and area of ​​coverage provided by the accommodating slot 3 for the ball head, thus enhancing the stability of the ball head after installation. Furthermore, the increased contact area between the accommodating slot 3 and the ball head improves the overall support strength of the acetabular liner, extending its service life.

[0038] The angle between the inclined end of the extension block 2 and the radial plane of the extension block 2 can be selected to be 10-20 degrees. This application is described with the extension block 2 inclined at 10 degrees.

[0039] At the same time, in order to facilitate the doctor to quickly find the longest part of the extension block 2 during the operation, so as to install the longest part of the extension block 2 at the position where the posterolateral ball head of the human body is easily dislocated, a marking line 21 is set at the end of the extension block 2 away from the acetabulum liner body 1, and the marking line 21 is located at the longest axial length of the extension block 2.

[0040] Reference Figure 2 The side of the acetabular liner body 1 away from the extension block 2 is processed into a plane, which forms a marking surface 11, making it convenient for the staff to mark the product model and other information on the marking surface 11, so that the doctor can directly select the appropriate acetabular liner according to the marked information.

[0041] Reference Figure 2 A plurality of limit blocks 22 cooperating with the acetabular cup are fixedly connected to the outer wall of the extension block 2. The plurality of limit blocks 22 are arranged at equal intervals around the axis of the extension block 2. This application takes 6 limit blocks 22 as an example for explanation. By cooperating with the corresponding positions of the acetabular cup, the circumferential position of the acetabular liner and the acetabular cup can be fixed, and installation and positioning are more convenient.

[0042] Of course, in order to prevent the acetabular liner from sliding out of the acetabular cup after being installed in the acetabular cup, the acetabular liner is also provided with an anti-slip assembly, which includes an anti-slip rib 23 fixed to the outer wall of the extension block 2. The anti-slip rib 23 is annular and fixed to the outer wall of the extension block 2. The cross-section of the anti-slip rib 23 is straight triangular, with its oblique edge facing one side of the acetabular liner body 1. Of course, the acetabular cup is provided with a groove that cooperates with the anti-slip rib 23. When the acetabular liner is installed on the acetabular cup, the end of the acetabular liner body 1 away from the extension block 2 is directly inserted into the acetabular cup. The oblique surface of the anti-slip rib 23 will abut against the end wall of the acetabular cup and smoothly slide into the groove of the acetabular cup, while the right-angled edge of the anti-slip rib 23 will abut against the side wall of the groove, reducing the probability of the acetabular liner sliding out of the acetabular cup.

[0043] The implementation principle of an eccentric acetabular liner according to an embodiment of the present application is as follows: during use, the acetabular liner is directly installed on the acetabular cup, with the marking line 21 of the extension block 2 located at a position where the posterolateral ball head is prone to dislocation. The ball head connected to the femoral stem prosthesis is then installed in the receiving groove 3, completing the hip replacement surgery. During surgery, the provision of the extension block 2 significantly increases the angle and area of ​​the acetabular liner's wrapping around the ball head, reducing the probability of the ball head slipping off the acetabular liner. Furthermore, the longest portion of the extension block 2 also blocks the ball head, preventing it from slipping out of the receiving groove 3 and dislocating, significantly reducing the probability of the ball head dislocating from the acetabular liner after installation.

[0044] The present application also discloses a tool for machining an eccentric acetabular liner. Figure 3 The tooling includes a mounting base 4, which includes a mounting tube 41. A limiting groove 411 is provided at one end of the mounting tube 41 for the upper limit block 22 of the eccentric acetabular liner to be inserted into. When it is necessary to mark the marking surface 11 of the eccentric acetabular liner, the end of the eccentric acetabular liner extension block 2, which is away from the acetabular liner body 1, is directly placed in the mounting tube 41 until the limiting block 22 is inserted into the limiting groove 411. The eccentric acetabular liner is then placed, and the marking surface 11 is parallel to the end surface of the mounting tube 41. The mounting tube 41 is then placed vertically and directly in the appropriate position to make the marking surface 11 parallel to the horizontal plane. The staff can then directly mark on the marking surface 11.

[0045] At the same time, in order to facilitate the staff to mark each eccentric acetabular liner in the same direction, scale lines and other marks can be set on the end surface of the installation tube 41. When the staff marks each eccentric acetabular liner, the longest or shortest part of the extension block 2 can be placed on the scale line, so that the marking direction on each eccentric acetabular liner is consistent.

[0046] Reference Figure 4 and Figure 5The mounting base 4 further includes a fixed shaft 42 detachably connected to the mounting tube 41. The fixed shaft 42 is tilted toward one end of the mounting tube 41 so that the axis of the mounting tube 41 and the axis of the fixed shaft 42 are tilted after installation. The angle of inclination between the axis of the mounting tube 41 and the axis of the fixed shaft 42 is also determined by the inclination angle of the inclined surface of the extended block 2 on the eccentric acetabular liner to be machined. In the present application, the axis of the mounting tube 41 is tilted 10 degrees relative to the axis of the fixed shaft 42. When it is necessary to machine the accommodating groove 3 for the eccentric acetabular liner, the end of the acetabular liner body 1 away from the extended block 2 can be directly placed in the mounting tube 41. When the limiting block 22 is embedded in the limiting groove 411, the end of the extended block 2 away from the acetabular liner body 1 will be parallel to the end of the fixed shaft 42 away from the mounting tube 41.

[0047] Among them, the mounting cylinder 41 can be threadedly connected to the fixed shaft 42 to realize a detachable connection between the mounting cylinder 41 and the fixed shaft 42. Specifically, an external thread is processed on the outer wall of the mounting cylinder 41, and an internal thread for the mounting cylinder 41 to be screwed in is provided at the inclined end of the fixed shaft 42. By screwing the mounting cylinder 41 onto the fixed shaft 42, the connection between the mounting cylinder 41 and the fixed shaft 42 can be realized.

[0048] At the same time, in order to ensure that the installation and positioning of the acetabular liner body 1 and the mounting tube 41 can be quickly achieved, when the acetabular liner body 1 is placed in the mounting tube 41, the end of the extension block 2 away from the acetabular liner body 1 is parallel to the end of the fixed axis 42 away from the mounting tube 41, and a positioning groove 421 is provided at the end of the fixed axis 42 facing the mounting tube 41. During installation, the shortest side of the extension block 2 is installed in the positioning groove 421. At this time, the inclined surface of the extension block 2 after installation will be parallel to the end of the fixed axis 42 away from the mounting tube 41.

[0049] Reference Figure 4 and Figure 5 When the accommodating groove 3 needs to be machined, in order to prevent the acetabular liner body 1 from sliding off the mounting tube 41 when the acetabular liner body 1 and the extension block 2 are formed with the accommodating groove 3, the mounting seat 4 also includes a screw cap 43 for fixing the position of the acetabular liner body 1 on the mounting tube 41. The screw cap 43 is threadedly connected to the mounting tube 41, and a avoidance hole 431 for the extension block 2 to pass through is formed on the screw cap 43. When the acetabular liner body 1 needs to be machined with the accommodating groove 3, the acetabular liner body 1 can be directly mounted on the mounting tube 41, and the position of the acetabular liner body 1 on the mounting tube 41 can be fixed by the screw cap 43. Then, the end of the fixing shaft 42 away from the mounting tube 41 is mounted on a lathe. At this time, the end of the extension block 2 away from the acetabular liner body 1 will be parallel to the vertical plane, and the staff can directly machine the eccentric accommodating groove 3 in one go using the lathe.

[0050] The screw threads on the screw cap 43 and the mounting tube 41 are in the opposite direction of rotation of the lathe, which can prevent the screw cap 43 from loosening relative to the mounting tube 41 when the lathe drives the fixed shaft 42 to rotate.

[0051] When it is necessary to process the marking line 21 on the extension block 2, in order to facilitate the laser equipment to directly irradiate the longest side of the extension block 2, so as to carve the marking line 21 on the longest end face of the extension block 2, refer to Figure 6 The mounting seat 4 also includes a fixing plate 44 for fixing the fixed shaft 42 on the workbench of the marking equipment. The fixing plate 44 is L-shaped as a whole, including a placement plate 441 fixed to the workbench of the marking equipment by bolts and a mounting plate 442 fixed to one end of the placement plate 441. The end of the fixed shaft 42 away from the mounting cylinder 41 is fixed to the mounting plate 442 by bolts, thereby fixing the position of the fixed shaft 42 on the workbench of the marking equipment, making it convenient to directly use the marking equipment to mark the eccentric acetabular liner installed on the mounting cylinder 41 with the marking line 21.

[0052] Among them, the angle between the L-shaped opening of the mounting plate 442 and the placement plate 441 can be selected to be between 85-165 degrees. This application takes the angle between the mounting plate 442 and the placement plate 441 as 125 degrees as an example for explanation.

[0053] At the same time, a plurality of pre-installation holes 443 are provided on the placement plate 441 and the mounting plate 442. The pre-installation holes 443 are arranged in a rectangular shape on the placement plate 441 and the mounting plate 442, so that the fixing plate 44 can be quickly installed by inserting bolts into the pre-installation holes 443 and screwing them onto the fixed shaft 42 or the workbench of the marking equipment.

[0054] When it is necessary to mark the marking line 21 on the end of the extension block 2 away from the acetabular liner body 1, the end of the acetabular liner body 1 away from the extension block 2 is directly installed in the installation tube 41, and the limit block 22 is inserted into the limit groove 411. When installing, the shortest side of the limit block 22 is facing the positioning groove 421. Then, the staff directly fixes the placement plate 441 to the workbench of the marking equipment with bolts, and fixes the fixed shaft 42 to the installation plate 442 with bolts. The staff can then directly use the marking equipment to mark the end of the extension block 2 away from the acetabular liner body 1.

[0055] The working principle of a tool for machining an eccentric acetabular liner according to an embodiment of the present application is as follows: during machining, the end of the extension block 2 away from the acetabular liner body 1 is directly placed in the mounting tube 41, and the worker can directly mark the marking surface 11. After marking is completed, the eccentric acetabular liner is directly removed from the mounting tube 41, and the mounting tube 41 is then screwed onto the fixing shaft 42. The end of the acetabular liner body 1 away from the extension block 2 is then placed on the mounting tube 41, with the shortest portion of the extension block 2 facing the positioning groove 421. The position of the eccentric acetabular liner on the mounting tube 41 is then fixed by a screw cap 43, and the end of the fixing shaft 42 away from the mounting tube 41 is mounted on a lathe. The lathe can then directly open the receiving groove 3 from the end of the extension block 2 away from the acetabular liner body 1. After the processing is completed, the fixed shaft 42 is directly removed from the lathe, and then the screw cover 43 is unscrewed, and the relative positions of the acetabular liner body 1 and the mounting tube 41 are adjusted so that the longest side of the extension block 2 faces the positioning groove 421, and the fixed shaft 42 is fixed to the mounting plate 442 by bolts. Finally, the placement plate 441 is fixed to the workbench of the marking equipment by bolts, and the eccentric acetabular liner can be marked with the marking line 21 by the marking equipment to complete the processing of the eccentric acetabular liner.

[0056] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A tool for machining an eccentric acetabular liner, characterized in that: The invention comprises a mounting seat (4), wherein the mounting seat (4) comprises a mounting tube (41), one end of the mounting tube (41) is provided with a limiting groove (411) for a limiting block (22) to be embedded in, and when the end of the extension block (2) away from the acetabular liner body (1) is placed in the mounting tube (41), the marking surface (11) is parallel to the end surface of the mounting tube (41); the mounting seat (4) also comprises a fixed shaft (42), one end of the mounting tube (41) is connected to one end of the fixed shaft (42), and the axis of the mounting tube (41) is parallel to the fixed shaft (42). The axis of the fixed shaft (42) is arranged to be inclined. When the acetabular liner body (1) is placed in the mounting tube (41), the side of the extension block (2) away from the acetabular liner body (1) is parallel to the end of the fixed shaft (42) away from the mounting tube (41). The mounting seat (4) also includes a screw cap (43) for fixing the position of the acetabular liner body (1) in the mounting tube (41). The screw cap (43) is threadedly connected to the mounting tube (41). The screw cap (43) is provided with an avoidance hole (431) for the acetabular liner body (1) to pass through.

2. A tool for machining an eccentric acetabular liner according to claim 1, characterized in that: A positioning groove (421) is formed at one end of the fixed shaft (42) facing the mounting tube (41).

3. A tool for machining an eccentric acetabular liner according to claim 1, characterized in that: The mounting seat (4) also includes a fixing plate (44) for fixing the position of the fixing shaft (42) on the workbench, the fixing plate (44) includes a placement plate (441) for fixing on the workbench and a mounting plate (442) fixedly connected to one end of the placement plate (441), the fixing shaft (42) is mounted on the mounting plate (442), and the placement plate (441) and the mounting plate (442) are arranged at an angle.

4. A tool for machining an eccentric acetabular liner according to claim 3, characterized in that: The angle between the placement plate (441) and the installation plate (442) is 85-165 degrees.

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