Meniscus liner and hinge type knee joint prosthesis

Abstract

The invention belongs to the technical field of medical instruments, and particularly discloses a meniscus liner and a hinge type knee joint prosthesis. The meniscus liner comprises a liner body, in the thickness direction of the liner body, the liner body is provided with a connecting hole for a rotating shaft to penetrate through, the connecting hole comprises a taper hole section and a straight hole section which are sequentially communicated in the axial direction of the connecting hole, and the taper hole section comprises a plurality of sub-hole sections which are sequentially communicated in the axial direction of the taper hole section; the inner diameters of the sub-hole sections are sequentially reduced in the direction from the end, away from the straight hole section, of the taper hole section to the end, close to the straight hole section, of the taper hole section; one end of the rotating shaft can be installed on the straight hole section, the other end of the rotating shaft can abut against the inner wall face, away from the straight hole section, of the sub-hole section, and a containing cavity can be formed between the inner wall face of the taper hole section and the outer wall of the rotating shaft. Abrasion with a hinge assembly can be reduced, and discomfort of a patient can be relieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a meniscus pad and a hinged knee joint prosthesis. Background Art

[0002] In a hinged knee prosthesis, when the meniscus pad is connected to the hinge assembly, the rotating axis of the hinge assembly is connected to the connecting hole of the meniscus pad. Long-term friction between the hinge assembly and the meniscus pad can easily lead to wear of the meniscus pad, and may even produce debris due to wear, further triggering an inflammatory reaction. Summary of the Invention

[0003] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, an embodiment of the present invention provides a meniscus pad that can reduce wear between the meniscus pad and the hinge assembly, thereby alleviating patient discomfort.

[0004] This embodiment also provides a hinged knee joint prosthesis.

[0005] The meniscus pad of an embodiment of the present invention includes a pad body, and the pad body has a connecting hole for passing a rotating shaft in the thickness direction of the pad body, and the connecting hole includes a tapered hole section and a straight hole section which are sequentially connected along the axial direction thereof, and the tapered hole section includes a plurality of sub-hole sections which are sequentially connected along the axial direction thereof, and the inner diameters of the plurality of sub-hole sections decrease sequentially in the direction from the end of the tapered hole section away from the straight hole section to the end close to the straight hole section; one end of the rotating shaft can be installed in the straight hole section, and the other end of the rotating shaft can abut against the inner wall surface of the sub-hole section away from the straight hole section, and an accommodating cavity can be formed between the inner wall surface of the tapered hole section and the outer wall of the rotating shaft.

[0006] In this embodiment, by configuring the connection hole on the liner body to include a tapered hole section and a straight hole section that are sequentially connected, and the tapered hole section includes multiple sequentially connected sub-hole sections, the rotating shaft can be installed in the straight hole section, and the straight hole section can be used to install and position the rotating shaft. At the same time, the rotating shaft can abut the inner wall surface of the sub-hole section away from the straight hole section, and the inner wall surface of the sub-hole section forms a stable support for the rotating shaft, thereby improving the stability of movement. A accommodating cavity is formed between the inner wall surface of the tapered hole section and the outer wall of the rotating shaft. The accommodating cavity can store joint fluid produced by the human body. The joint fluid lubricates the accommodating cavity, thereby reducing friction between the rotating shaft and the liner body, thereby improving the service life. The formation of the accommodating cavity also reduces direct contact between the rotating shaft and the liner body, which is conducive to reducing friction. Particles generated by wear can also be temporarily stored in the accommodating cavity, reducing further wear caused by the particles on the rotating shaft and the liner body. In addition, the inner diameters of the multiple sub-hole sections decrease sequentially, which can disperse the stress of the liner body and reduce stress concentration when the liner body is subjected to force, thereby improving the service life of the liner body.

[0007] In this embodiment, the tapered hole segment includes three sub-hole segments, namely, a first sub-hole segment, a second sub-hole segment and a third sub-hole segment.

[0008] In this embodiment, the length of the first sub-hole segment is L1, L1 = 5mm ~ 10mm; and / or the length of the second sub-hole segment is L2, L2 = 0.5mm ~ 10mm; and / or the length of the third sub-hole segment is L3, L3 = 0.5mm ~ 5mm.

[0009] In this embodiment, within the projection plane in the thickness direction of the liner body, the outer contour of the first sub-hole segment is elliptical, the inner contour is circular, and the major axis direction of the ellipse is consistent with the front-to-back direction of the liner body.

[0010] In this embodiment, the angle between the busbar of the first sub-hole segment corresponding to the front side of the liner body and the central axis of the straight hole segment is a, a=10°~60°; and / or, the angle between the busbar of the first sub-hole segment corresponding to the rear side of the liner body and the central axis of the straight hole segment is b, b=30°~70°.

[0011] In this embodiment, the second sub-hole segment is a tapered hole or a straight hole; and / or the third sub-hole segment is a tapered hole, and the tapered angle of the third sub-hole segment is c, where c=30° to 45°.

[0012] In this embodiment, the length of the straight hole section is L4, where L4 = 0.5 mm to 20 mm.

[0013] In this embodiment, within the projection in the thickness direction of the liner body, the center of the straight hole section is at the intersection of a position offset forward by a preset distance based on the center line of the liner body in the front-to-back direction and the center line of the liner body in the inside-outside direction.

[0014] In this embodiment, the preset distance is L, where L=1 mm to 20 mm.

[0015] The hinged knee joint prosthesis in this embodiment includes the above-mentioned meniscus pad and rotation axis, the distal end of the rotation axis is connected to the connecting hole, and the proximal end of the rotation axis abuts the inner wall of the tapered hole section away from the straight hole section. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a cross section of the meniscus pad according to an embodiment of the present invention. Figure 1 ;

[0017] Figure 2 1 is a schematic diagram of a top view of the meniscus liner according to an embodiment of the present invention;

[0018] Figure 3 This is a cross section of the meniscus pad according to an embodiment of the present invention. Figure 2 ;

[0019] Figure 4 Schematic diagram of the structure of the meniscus pad and the rotation axis according to an embodiment of the present invention.

[0020] Reference numerals:

[0021] 1. Gasket body; 11. Connecting hole; 111. Tapered hole section; 1111. First sub-hole section; 1112. Second sub-hole section; 1113. Third sub-hole section; 112. Straight hole section;

[0022] 2. Rotation axis. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0024] To better explain and illustrate the technical solutions of the present invention, the directions and other aspects involved in the present invention are explained and illustrated in conjunction with conventional description methods in the art. In the fields of anatomy and medical devices, directions and planes such as medial, lateral, anterior, posterior, distal, proximal, sagittal, coronal, and transverse have specific meanings and are well known to those skilled in the art. Unless otherwise specified, these terms have the meanings generally recognized by those skilled in the art.

[0025] Generally, when describing the human body, joints or prostheses, the following three sections are usually involved: sagittal plane, coronal plane and cross-sectional plane. Among them, the sagittal plane refers to the longitudinal section that divides the human body or joint into left and right parts from the front-to-back direction. Among them, the sagittal plane passing through the center of the human body is the median sagittal plane, which divides the human body into two equal left and right parts. The coronal plane refers to the longitudinal section that divides the human body or joint into front and back parts from the left-to-right direction. The coronal plane is perpendicular to the sagittal plane. The cross-sectional plane is a plane parallel to the ground plane that divides the human body or joint into upper and lower parts. The cross-sectional plane is perpendicular to the coronal and sagittal planes.

[0026] It should be understood that when describing the knee joint or knee prosthesis, the sagittal, coronal, and transverse planes refer to the view taken when the person is standing upright, with the knee flexed at 0°. The view may change as the knee joint or knee prosthesis flexes or extends, or as the person's posture changes.

[0027] Generally, when describing the human body, joints, or prostheses, three different directions are used: proximal and distal, medial and posterior. Distal refers to the end of a body or joint that is relatively farthest from the trunk. Proximal refers to the end of a body or joint that is relatively close to the trunk. Medial refers to the side closer to the midsagittal plane of the body. Lateral refers to the side farther from the midsagittal plane of the body. Anterior refers to the end of the sagittal plane that is closer to the abdomen. Posterior refers to the end of the sagittal plane that is closer to the back.

[0028] like Figures 1 to 4 As shown, the meniscus pad in this embodiment includes a pad body 1, and in the thickness direction of the pad body 1 ( Figure 2 The liner body 1 has a connecting hole 11 for passing the rotating shaft 2, and the connecting hole 11 includes a tapered hole section 111 and a straight hole section 112 which are sequentially connected along the axial direction thereof. The tapered hole section 111 includes a plurality of sub-hole sections which are sequentially connected along the axial direction thereof, and the inner diameters of the plurality of sub-hole sections decrease in sequence from the end of the tapered hole section 111 away from the straight hole section 112 to the direction close to the end of the straight hole section 112; one end of the rotating shaft 2 can be installed in the straight hole section 112, and the other end of the rotating shaft 2 can abut against the inner wall surface of the sub-hole section away from the straight hole section 112, and an accommodating cavity can be formed between the inner wall surface of the tapered hole section 111 and the outer wall of the rotating shaft 2.

[0029] Specifically, one end of the rotating shaft 2 is installed in the straight hole section 112, which means that the rotating shaft 2 can be loosely matched with the straight hole section 112, so that the rotating shaft 2 can move relative to the gasket body 1, and the rotating shaft 2 can be positioned at the same time.

[0030] In this embodiment, by setting the connecting hole 11 on the gasket body 1 to include a tapered hole section 111 and a straight hole section 112 that are connected in sequence, and the tapered hole section 111 includes a plurality of sub-hole sections that are connected in sequence, the rotating shaft 2 can be installed in the straight hole section 112, and the rotating shaft 2 can be installed and positioned through the straight hole section 112; at the same time, the rotating shaft 2 can abut against the inner wall surface of the sub-hole section away from the straight hole section 112, and the inner wall surface of the sub-hole section forms a stable support for the rotating shaft 2, which can improve the stability of the movement, and a accommodating cavity is formed between the inner wall surface of the tapered hole section 111 and the outer wall of the rotating shaft 2, which can store the joint fluid produced by the human body itself. Lubrication by the joint fluid can reduce the friction between the rotating shaft 2 and the gasket body 1, thereby improving the service life; the formation of the accommodating cavity also reduces the direct contact between the rotating shaft 2 and the gasket body 1, which is conducive to reducing friction; particles generated by wear can also be temporarily stored in the accommodating cavity, reducing further wear on the rotating shaft 2 and the gasket body 1 caused by the particles. In addition, the inner diameters of the multiple sub-hole sections decrease in sequence, which can disperse the stress of the gasket body 1 and reduce the stress concentration of the gasket body 1 when the gasket body 1 is subjected to force, thereby increasing the service life of the gasket body 1.

[0031] In this embodiment, if Figure 2As shown, the tapered hole segment 111 includes three sub-hole segments, namely a first sub-hole segment 1111 , a second sub-hole segment 1112 and a third sub-hole segment 1113 .

[0032] Specifically, the first sub-hole segment 1111, the second sub-hole segment 1112 and the third sub-hole segment 1113 are arranged in sequence, and the third sub-hole segment 1113 is connected to the straight hole segment 112. The rotating shaft 2 can abut against the inner wall surface of the first sub-hole segment 1111 away from the second sub-hole segment 1112, and an accommodating cavity is formed between the inner wall surface of the first sub-hole segment 1111 close to one end of the second sub-hole segment 1112, the inner wall surface of the second sub-hole segment 1112 and the inner wall surface of the third sub-hole segment 1113 and the rotating shaft 2.

[0033] It can be understood that the inner wall surface of the first sub-hole segment 1111 can form a support for the rotating shaft 2, so that the rotating shaft 2 can be stably installed, and a accommodating cavity for accommodating joint fluid can be formed between the first sub-hole segment 1111, the second sub-hole segment 1112, the third sub-hole segment 1113 and the rotating shaft 2. Lubrication by joint fluid can reduce the rotational friction and wear between the rotating shaft 2 and the pad body 1, which is conducive to improving the service life; the inner wall surface of the second sub-hole segment 1112 can form a gap with the rotating shaft 2, extending the length of the accommodating cavity, which can further The contact between the rotating shaft 2 and the gasket body 1 is reduced, thereby further reducing friction. Moreover, by providing the second sub-hole segment 1112, the pressure on the proximal end of the gasket body 1 can be buffered, the force can be dispersed, and the straight hole segment 112 and the third sub-hole segment 1113 can be protected from damage due to the force applied to the proximal end of the gasket body 1. The third sub-hole segment 1113 connects the straight hole segment 112 and the second sub-hole segment 1112. The transition of the third sub-hole segment 1113 can disperse stress, protect the straight hole segment 112, and at the same time help to improve the strength of the gasket body 1. In summary, the tapered hole segment 111 in this embodiment includes three sub-hole segments, which can reduce the friction between the rotating shaft 2 and the gasket body 1 while also helping to improve the strength of the gasket body 1.

[0034] In this embodiment, the length of the first sub-hole section 1111 is L1, where L1 = 5 mm to 10 mm.

[0035] For example, L1 can be 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, etc. If the length of the first sub-hole segment 1111 is too long, it will affect the strength of the pad body 1; if the length of the first sub-hole segment 1111 is too short, it will not be conducive to reducing friction.

[0036] It can be understood that in this embodiment, by setting the length L1 of the first sub-hole section 1111 to 5mm~10mm, while ensuring the strength of the pad body 1, the accommodating cavity can have sufficient space to accommodate the joint fluid, which is beneficial to reducing the friction between the pad body 1 and the rotating shaft 2.

[0037] In this embodiment, if Figure 2 As shown, in the projection plane in the thickness direction of the liner body 1 , the outer contour of the first sub-hole segment 1111 is elliptical, the inner contour is circular, and the major axis direction of the ellipse is consistent with the front-to-back direction of the liner body 1 .

[0038] According to the first sub-hole segment 1111 of this embodiment, since the inner diameter of the proximal end of the first sub-hole segment 1111 is greater than the inner diameter of the distal end, and the outer circumference of the first sub-hole segment 1111 is elliptical and the inner circumference is circular, the contact area between the proximal end of the first sub-hole segment 1111 and the rotating shaft 2 is increased while also reducing the gap between the distal end of the first sub-hole segment 1111 and the rotating shaft 2, thereby increasing the stability of the installation of the rotating shaft 2. The major axis of the ellipse is consistent with the front-to-back direction of the gasket body 1, which is consistent with the installation direction of the rotating shaft 2. That is, the direction of the larger dimension of the end of the rotating shaft 2 is consistent with the major axis of the ellipse, so that the inner wall of the first sub-hole segment 1111 provides stable support for the rotating shaft 2.

[0039] In this embodiment, if Figure 3 As shown, the included angle between the generatrix of the first sub-hole segment 1111 corresponding to the front side of the gasket body 1 and the central axis of the straight hole segment 112 is a, and a = 10° to 60°. In this embodiment, the included angle between the generatrix of the first sub-hole segment 1111 corresponding to the rear side of the gasket body 1 and the central axis of the straight hole segment 112 is b, and b = 30° to 70°.

[0040] For example, a can be 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, or 60°, etc. C can be 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, or 70°, etc. The specific values ​​of a and b can be set according to actual needs and are not limited here.

[0041] It can be understood that when the busbars on the front side and the busbars on the rear side of the first sub-hole section 1111 adopt the above-mentioned parameter range, it can ensure that the contact between the rotating shaft 2 and the pad body 1 is more stable, and the stress distribution is more uniform, thereby reducing wear and patient discomfort and improving the patient's usage experience.

[0042] In this embodiment, the length of the second sub-hole section 1112 is L2, L2 = 0.5 mm to 10 mm;

[0043] For example, L2 can be 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, etc. If the length of the second sub-hole segment 1112 is too long, it will affect the thickness setting of the other hole segments or the pad body 1; if the length of the second sub-hole segment 1112 is too short, it will affect the stress dispersion effect.

[0044] In this embodiment, the second sub-hole segment 1112 is a tapered hole or a straight hole. The specific shape of the second sub-hole segment 1112 can be selected according to actual needs and is not limited here.

[0045] In this embodiment, by setting the length L2 of the second sub-hole segment 1112 to 0.5mm~10mm, the force applied to the end can be dispersed while allowing the accommodating cavity to have sufficient space to accommodate the joint fluid, and reducing the impact on the thickness setting of other hole segments and the pad body 1.

[0046] In this embodiment, the length of the third sub-hole segment 1113 is L3, where L3 = 0.5 mm to 5 mm.

[0047] For example, L3 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc. If the length of the third sub-hole segment 1113 is too short, it will affect the stress dispersion effect and be inconvenient for processing. If the length of the third sub-hole segment 1113 is too long, it will affect the setting of the thickness of other hole segments and the pad body 1.

[0048] In this embodiment, by setting the length L3 of the third sub-hole segment 1113 to 0.5 mm to 5 mm, the force applied to the proximal end of the pad body 1 is buffered and the stress is dispersed, which is also conducive to ensuring the strength of the pad body 1.

[0049] In this embodiment, if Figure 3 As shown, the third sub-hole segment 1113 is a tapered hole, and the tapered angle of the third sub-hole segment 1113 is c, where c=30° to 45°. For example, c can be 30°, 35°, 40°, or 45°.

[0050] The inventors of this application have discovered through experimental research that when the cone angle of the third sub-hole segment 1113 adopts the above-mentioned parameter range, while effectively dispersing stress and protecting the straight hole segment 112 from damage caused by the force applied by the liner body 1, the length of the third sub-hole segment 1113 can also be controlled.

[0051] In this embodiment, the length of the straight hole section 112 is L4, where L4 = 0.5 mm to 20 mm.

[0052] For example, the length L4 of the straight hole section 112 can be 0.5 mm, 2.5 mm, 5 mm, 8 mm, 10 mm, 12 mm, 15 mm, 18 mm, or 20 mm. If the length of the straight hole section 112 is too long, the friction between the gasket body 1 and the rotating shaft 2 will increase; if the length of the straight hole section 112 is too short, the stability of the installation of the rotating shaft 2 will be affected.

[0053] When the length of the straight hole section 112 adopts the above parameter range, while meeting the stable installation requirements of the rotating shaft 2, the contact area between the pad body 1 and the rotating shaft 2 can be reduced, thereby reducing the friction between the pad body 1 and the rotating shaft 2, which is beneficial to reducing wear and improving the patient's use experience.

[0054] In this embodiment, if Figure 2 As shown, in the projection in the thickness direction of the liner body 1, the center of the straight hole section 112 is at the intersection of a position offset forward by a preset distance based on the center line of the front-to-back direction of the liner body 1 and the center line of the inside-to-outside direction of the liner body 1.

[0055] It can be understood that by taking the center line of the inner and outer directions and the center line of the front and back directions of the pad body 1 as a reference and setting the center of the connecting hole 11 according to the differences of individual knee joints, the position of the connecting hole 11 can be precisely controlled by precisely controlling the position of the center of the circle, thereby reducing the installation error of the rotating shaft 2 and improving the force distribution of the pad body 1, thereby improving the matching degree between the prosthesis and the human body and further improving the comfort of the prosthesis.

[0056] In this embodiment, the preset distance is L, where L = 1 mm to 20 mm. For example, L can be 1 mm, 3 mm, 5 mm, 8 mm, 10 mm, 12 mm, 15 mm, 17 mm, or 20 mm. If the value of L is too large or too small, the fit between the prosthesis and the human body will be affected.

[0057] The inventors of this application have found through experimental research that when the preset distance adopts the above parameter range, the human body's free movement needs can be realized, and it can be adjusted according to individual differences to improve the matching degree between the prosthesis and the human body, thereby improving the comfort of the prosthesis.

[0058] like Figure 1 and Figure 4 As shown, the hinged knee joint prosthesis in this embodiment includes the above-mentioned meniscus pad and rotation axis 2. The distal end of the rotation axis 2 is connected to the connecting hole 11, and the proximal end of the rotation axis 2 abuts against the inner wall of the tapered hole section 111 away from the straight hole section 112.

[0059] According to the hinged knee joint prosthesis in this embodiment, by providing the above-mentioned meniscus pad, the rotating shaft 2 is installed and positioned through the straight hole section 112, and the rotating shaft 2 can be stably supported by the tapered hole section 111, thereby improving the stability of movement. A accommodating cavity is formed between the inner wall surface of the tapered hole section 111 and the outer wall of the rotating shaft 2. The accommodating cavity can store the joint fluid produced by the human body itself. Lubrication by the joint fluid can reduce the friction between the rotating shaft 2 and the pad body 1, thereby improving the service life. The formation of the accommodating cavity also reduces the direct contact between the rotating shaft 2 and the pad body 1, which is beneficial to reducing friction. Particles generated by wear can also be temporarily stored in the accommodating cavity, reducing further wear caused by the particles on the rotating shaft 2 and the pad body 1, which is beneficial to reducing the patient's pain and discomfort and improving the patient's use experience. In addition, the tapered hole section 111 can also disperse the stress of the pad body 1, reducing the stress concentration of the pad body 1 when it is under force, thereby improving the service life of the pad body 1.

[0060] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0062] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0063] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0064] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0065] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A meniscus pad, characterized in that: The invention comprises a gasket body, wherein the gasket body has a connecting hole for passing a rotating shaft in a thickness direction of the gasket body, the connecting hole comprising a tapered hole section and a straight hole section sequentially connected along its axial direction, the tapered hole section comprising a plurality of sub-hole sections sequentially connected along its axial direction, and the inner diameters of the plurality of sub-hole sections sequentially decrease in a direction from an end of the tapered hole section away from the straight hole section to an end close to the straight hole section; One end of the rotating shaft can be installed in the straight hole section, and the other end of the rotating shaft can abut against the inner wall surface of the sub-hole section away from the straight hole section, and an accommodating cavity can be formed between the inner wall surface of the tapered hole section and the outer wall of the rotating shaft.

2. The meniscus pad according to claim 1, wherein: The tapered hole segment includes three sub-hole segments, namely a first sub-hole segment, a second sub-hole segment and a third sub-hole segment.

3. The meniscus pad according to claim 2, wherein: The length of the first sub-hole section is L1, L1 = 5mm to 10mm; and / or, the length of the second sub-hole segment is L2, L2=0.5mm~10mm; And / or, the length of the third sub-hole segment is L3, L3 = 0.5 mm to 5 mm.

4. The meniscus liner according to claim 2, wherein: In the projection plane in the thickness direction of the liner body, the outer peripheral contour of the first sub-hole segment is an ellipse, the inner peripheral contour is a circle, and the major axis direction of the ellipse is consistent with the front-to-back direction of the liner body.

5. The meniscus liner according to claim 2, wherein: The angle between the generatrix of the first sub-hole segment corresponding to the front side of the liner body and the central axis of the straight hole segment is a, a=10°~60°; And / or, the angle between the generatrix of the first sub-hole segment corresponding to the rear side of the liner body and the central axis of the straight hole segment is b, and b=30°~70°.

6. The meniscus liner according to claim 2, wherein: The second sub-hole section is a tapered hole or a straight hole; And / or, the third sub-hole segment is a tapered hole, and the tapered angle of the third sub-hole segment is c, where c=30° to 45°.

7. The meniscus liner according to claim 1, wherein The length of the straight hole section is L4, where L4 = 0.5 mm to 20 mm.

8. The meniscus pad according to any one of claims 1 to 7, characterized in that In the projection in the thickness direction of the liner body, the center of the straight hole section is at the intersection of a position offset forward by a preset distance from the center line of the liner body in the front-to-back direction and the center line of the liner body in the inside-outside direction.

9. The meniscus liner according to claim 8, characterized in that The preset distance is L, where L=1 mm to 20 mm.

10. A hinged knee joint prosthesis, characterized in that: It comprises the meniscus pad and a rotating shaft according to any one of claims 1 to 9, wherein the distal end of the rotating shaft is connected to the connecting hole, and the proximal end of the rotating shaft abuts against the inner wall of the tapered hole section away from the straight hole section.

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