CN115844598A - Finger joint prosthesis - Google Patents
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- CN115844598A CN115844598A CN202310179976.9A CN202310179976A CN115844598A CN 115844598 A CN115844598 A CN 115844598A CN 202310179976 A CN202310179976 A CN 202310179976A CN 115844598 A CN115844598 A CN 115844598A
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Abstract
The invention provides a finger joint prosthesis, which comprises a first finger joint and a second finger joint, wherein the first finger joint can rotate relative to the second finger joint through a joint convex surface and a joint concave surface; wherein, the joint convex surface includes first sphere and with the tangent first backstop face of first sphere, the joint concave surface includes the second sphere and with the tangent second backstop face of second sphere, first sphere and second sphere cooperate, the central angle of the pitch arc of first sphere is greater than or equal to the central angle of the pitch arc of second sphere, first backstop face parallels with the axis of first intramedullary pole, the axis of second backstop face and second intramedullary pole parallels, the finger joint prosthesis has unbending state and curved state, when finger joint prosthesis is in the unbending state, first intramedullary pole and the equidirectional extension of second intramedullary pole, first backstop face and the laminating of second backstop face mutually. Through the technical scheme provided by the application, the problem of hyperextension of the finger joint prosthesis in the related technology can be solved.
Description
Technical Field
The invention relates to the technical field of finger joint prostheses, in particular to a finger joint prosthesis.
Background
Human finger joints are often affected, and various reasons such as trauma, diseases and long-term affected cause pathological changes of the finger joints, so that functions of the finger joints are affected, and patients with finger joint pathological changes at the end stage of pathological changes often have symptoms of joint flexion difficulty, outward oblique deformity, stiffness and even snake-like fingers.
In the related art, artificial joint replacement is used to replace a diseased finger joint with a finger joint prosthesis, which is promising for a patient with finger joint disease.
However, the structural design of the finger joint prosthesis in the related art has a drawback that the finger joint prosthesis includes the first finger joint and the second finger joint which are hinged, and when the finger joint prosthesis is in a straightened state, the first finger joint can rotate relative to the second finger joint to the back side of the hand, so that the finger joint prosthesis in the related art has an over-extension problem.
Disclosure of Invention
The invention provides a finger joint prosthesis, which aims to solve the problem of hyperextension of the finger joint prosthesis in the related art.
The invention provides a finger joint prosthesis, which comprises a first finger joint, a second finger joint and a third finger joint, wherein the first finger joint comprises a first intramedullary rod and a first joint arranged at one end of the first intramedullary rod; the second knuckle comprises a second intramedullary rod and a second knuckle arranged at one end of the second intramedullary rod, a knuckle concave surface is arranged at one end, far away from the second intramedullary rod, of the second knuckle, the first knuckle can rotate relative to the second knuckle through a knuckle convex surface and the knuckle concave surface, the knuckle prosthesis has a straightened state and a bent state, when the knuckle prosthesis is in the straightened state, the extending direction of the axis of the first intramedullary rod is the same as that of the axis of the second intramedullary rod, and when the knuckle prosthesis is in the bent state, the axis of the first intramedullary rod and the axis of the second intramedullary rod are arranged in an included angle; wherein, the joint convex surface includes first sphere and with the tangent first backstop face of first sphere, the joint concave surface includes the second sphere and with the tangent second backstop face of second sphere, first sphere and second sphere cooperate, in the direction around the axis of rotation of first finger joint, the central angle of the pitch arc of first sphere is greater than or equal to the central angle of the pitch arc of second sphere, first backstop face parallels with the axis of first intramedullary rod, the axis of second backstop face and second intramedullary rod parallels, when finger joint prosthesis is in the extension state, first backstop face and second backstop face laminate mutually.
Further, the central angle of the arc of the second spherical surface in the direction around the rotational axis of the first knuckle is greater than or equal to 180 °.
Further, a connecting line between one end of the second stopping surface far away from the second spherical surface and one end of the second spherical surface far away from the second stopping surface is a preset connecting line, and an included angle between the preset connecting line and the axis of the second intramedullary rod is 110-135 degrees.
Further, a central angle of an arc of the first spherical surface in a direction around the rotation axis of the first knuckle is greater than or equal to 180 °.
Furthermore, the first spherical surface and the second spherical surface are both ellipsoids, and the long axis of the ellipsoid is the rotation axis of the first finger joint.
Further, when the finger joint prosthesis is in a flexed state, the maximum included angle between the axis of the first stem and the axis of the second stem is between 65 ° and 90 °.
Furthermore, the first finger joint is made of ultra-high molecular weight polyethylene or cross-linked polyethylene; and/or the second finger joint is made of cobalt chromium molybdenum materials.
Further, the first intramedullary rod comprises a first polished rod section and a first porous section which are coaxially connected, one end, far away from the first porous section, of the first polished rod section is connected with the first joint, and a first porous structure is arranged on the side wall of the first porous section.
Further, the second intramedullary rod comprises a second polished rod section and a second porous section which are coaxially connected, one end, far away from the second porous section, of the second polished rod section is connected with the second joint, and a second porous structure is arranged on the side wall of the second porous section.
Further, a third porous structure is arranged at one end of the second joint close to the second intramedullary rod.
By applying the technical scheme of the invention, the finger joint prosthesis comprises a first finger joint and a second finger joint, the first intramedullary rod and the second intramedullary rod are respectively implanted into two damaged finger bones of a joint, the first finger joint rotates relative to the second finger joint by utilizing the matching of a concave surface and a convex surface of the joint, the finger joint prosthesis has a straightened state and a bent state to replace the damaged finger joint, and the first stop surface is tangent to the first spherical surface, the second stop surface is tangent to the second spherical surface, the axis of the first intramedullary rod is parallel to the axis of the second finger joint, and the second stop surface is parallel to the axis of the second intramedullary rod.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of a finger joint prosthesis provided according to an embodiment of the present invention in a straightened state;
fig. 2 is a schematic structural view showing a finger joint prosthesis provided according to an embodiment of the present invention in a bent state;
FIG. 3 shows a right side view of a finger joint prosthesis provided in accordance with an embodiment of the present invention in a straightened state;
fig. 4 shows a right side view of a finger joint prosthesis provided according to an embodiment of the present invention in a flexed state;
FIG. 5 shows a front view of a finger joint prosthesis provided in accordance with an embodiment of the present invention in a straightened state;
FIG. 6 is a front view showing a finger joint prosthesis provided according to an embodiment of the present invention in a flexed state;
FIG. 7 shows a left side view of a finger joint prosthesis provided in accordance with an embodiment of the present invention in a straightened state;
FIG. 8 is a left side view of a knuckle prosthesis provided in accordance with an embodiment of the present invention in a flexed state;
FIG. 9 is a schematic structural view showing a first finger joint of the finger joint prosthesis provided according to the embodiment of the present invention;
figure 10 shows a left side view of a first finger joint of a finger joint prosthesis provided in accordance with an embodiment of the present invention;
figure 11 shows a posterior view of a first finger joint of a finger joint prosthesis provided in accordance with an embodiment of the invention;
figure 12 shows a right side view of a first finger joint of a finger joint prosthesis provided in accordance with an embodiment of the present invention;
FIG. 13 is a schematic structural view showing a second finger joint of the finger joint prosthesis provided according to the embodiment of the present invention;
FIG. 14 shows a right side view of a second finger joint of the finger joint prosthesis provided in accordance with an embodiment of the present invention;
FIG. 15 shows a front view of a second finger joint of the finger joint prosthesis provided according to an embodiment of the present invention;
figure 16 shows a left side view of a first finger joint of a finger joint prosthesis provided in accordance with an embodiment of the present invention;
figure 17 shows a cross-sectional view of a first finger joint of a finger joint prosthesis provided in accordance with an embodiment of the present invention.
Wherein the figures include the following reference numerals:
10. a first knuckle; 11. a first intramedullary rod; 12. a first joint; 121. a convex surface of the joint; 1211. a first spherical surface; 1212. a first stop surface;
20. a second knuckle; 21. a second intramedullary rod; 211. a second polished rod segment; 212. a second porous section; 2121. a second porous structure; 22. a second joint; 221. a joint concavity; 2211. a second spherical surface; 2212. a second stop surface; 23. a third porous structure;
l, presetting a connecting line;
a1, in the direction around the rotation axis of the first knuckle, the central angle of the arc line of the first spherical surface;
a2, in the direction around the rotation axis of the first knuckle, the central angle of the arc line of the second spherical surface;
a3, presetting an included angle between the connecting line and the axis of the second intramedullary rod;
and A4, when the finger joint prosthesis is in a bent state, the maximum included angle between the axis of the first intramedullary rod and the axis of the second intramedullary rod is formed.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 17, an embodiment of the present invention provides a finger joint prosthesis, which includes a first finger joint 10 and a second finger joint 20, the first finger joint 10 includes a first intramedullary rod 11 and a first joint 12 disposed at one end of the first intramedullary rod 11, one end of the first joint 12 away from the first intramedullary rod 11 is provided with a convex joint surface 121, the second finger joint 20 includes a second intramedullary rod 21 and a second joint 22 disposed at one end of the second intramedullary rod 21, one end of the second joint 22 away from the second intramedullary rod 21 is provided with a concave joint surface 221, the first finger joint 10 can rotate relative to the second finger joint 20 through the convex joint surface 121 and the concave joint surface 221, the finger joint prosthesis has a straightened state and a bent state, when the finger joint prosthesis is in the straightened state, the extending direction of the axis of the first intramedullary rod 11 and the axis of the second intramedullary rod 21 is the same, when the finger joint prosthesis is in a bent state, the axis of the first intramedullary rod 11 and the axis of the second intramedullary rod 21 are arranged at an included angle, wherein the convex joint surface 121 comprises a first spherical surface 1211 and a first stop surface 1212 tangent to the first spherical surface 1211, the concave joint surface 221 comprises a second spherical surface 2211 and a second stop surface 2212 tangent to the second spherical surface 2211, the first spherical surface 1211 and the second spherical surface 2211 are matched, the central angle A1 of the arc of the first spherical surface 1211 is greater than or equal to the central angle A2 of the arc of the second spherical surface 2211 in the direction around the rotation axis of the first finger joint 10, the first stop surface 1212 is parallel to the axis of the first intramedullary rod 11, the second stop surface inner rod 2212 is parallel to the axis of the second intramedullary rod 21, and when the finger joint prosthesis is in a straightened state, the first stop surface 1212 and the second stop surface 2212 are fitted.
By applying the technical scheme of the invention, the finger joint prosthesis comprises a first finger joint 10 and a second finger joint 20, the first intramedullary rod 11 and the second intramedullary rod 21 are respectively implanted into two damaged phalanges of a joint, the first finger joint 10 rotates relative to the second finger joint 20 by using the cooperation of a joint concave surface 221 and a joint convex surface 121, the finger joint prosthesis has a straightened state and a bent state to replace the damaged finger joint, because a first stop surface 1212 is tangent to a first spherical surface 1211, a second stop surface 2212 is tangent to a second spherical surface 2211, the first stop surface 1212 is parallel to the axis of the first intramedullary rod 11, the second stop surface 2212 is parallel to the axis of the second intramedullary rod 21, and when the finger joint prosthesis is in the straightened state, the first stop surface 1212 and the second stop surface 2212 are attached to prevent the first finger joint 10 from rotating relative to the second finger joint 20 to the dorsal side of the finger joint, so that the finger joint prosthesis is prevented from extending beyond the dorsal side of the finger joint.
Note that, in the direction around the rotation axis of the first finger joint 10, the central angle A1 of the arc of the first spherical surface 1211 is greater than or equal to the central angle A2 of the arc of the second spherical surface 2211, which means that in fig. 11 and 17, the central angle A1 of the arc of the first spherical surface 1211 is greater than or equal to the central angle A2 of the arc of the second spherical surface 2211.
After the finger joint prosthesis is implanted into a human body, under the wrapping effect of soft tissues of the human body, the first finger joint 10 and the second finger joint 20 are subjected to the acting force approaching each other in the axial direction of the second intramedullary rod 21, so that the convex joint surface 121 is prevented from being separated from the concave joint surface 221.
As shown in fig. 17, the central angle A2 of the arc of the second spherical surface 2211 in the direction around the rotational axis of the first finger joint 10 is greater than or equal to 180 °. With the angle A2 in the above range, the contact area between the first spherical surface 1211 and the second spherical surface 2211 is increased, so that the second spherical surface 2211 can be better wrapped on the first spherical surface 1211, and the convex joint surface 121 is further prevented from being separated from the concave joint surface 221.
As shown in fig. 15, a connection line between one end of the second stop surface 2212 far from the second spherical surface 2211 and one end of the second spherical surface 2211 far from the second stop surface 2212 is a preset connection line L, and an included angle A3 between the preset connection line L and the axis of the second intramedullary rod 21 is between 110 ° and 135 °. By adopting the angle A3 in the above range, the second stop surface 2212 can have a sufficient height, and when the finger joint prosthesis is in a straightened state, the contact area between the second stop surface 2212 and the first stop surface 1212 can be ensured, so as to ensure the stop function of the second stop surface 2212 on the first stop surface 1212, further prevent the first finger joint 10 from rotating towards the back of the hand relative to the second finger joint 20, and further prevent the finger joint prosthesis from extending too far.
Specifically, the included angle A3 between the preset connection line L and the axis of the second stem 21 may be any value between 110 °, 115 °, 120 °, 125 °, 130 °, 135 ° and 110 ° to 135 °.
As shown in fig. 11, the central angle A1 of the arc of the first spherical surface 1211 in the direction around the rotational axis of the first finger joint 10 is greater than or equal to 180 °. With the angle range A1, the contact area between the first spherical surface 1211 and the second spherical surface 2211 is increased, so that the first spherical surface 1211 can rotate at a certain angle relative to the second spherical surface 2211 to meet the daily life needs of the patient.
In the present embodiment, the central angle A1 of the arc of the first spherical surface 1211 is equal to 270 ° and the central angle A2 of the arc of the second spherical surface 2211 is equal to 180 ° in the direction around the rotational axis of the first finger joint 10.
In this embodiment, the first spherical surface 1211 and the second spherical surface 2211 are both ellipsoids, and the major axis of the ellipsoids is the rotation axis of the first finger joint 10. Specifically, compared with the case where the convex joint surface 121 and the concave joint surface 221 are cylindrical surfaces, the axis of the cylindrical surface is the rotation axis of the first finger joint 10, and the ellipsoid is adopted, so that the first finger joint 10 rotates around the long axis of the ellipsoid relative to the second finger joint 20, and in other directions, the first finger joint 10 has a certain rotation redundancy relative to the second finger joint 20.
Compared with the first spherical surface 1211 and the second spherical surface 2211 which are both spherical surfaces, the ellipsoid is adopted, so that the first finger joint 10 rotates relative to the second finger joint 20 around the long axis of the ellipsoid, and in other directions, the first finger joint 10 only has certain rotation redundancy relative to the second finger joint 20 and cannot rotate greatly, so that the first finger joint 10 has a certain rotation axis in the process of rotating relative to the second finger joint 20 through the convex joint surface 121 and the concave joint surface 221.
As shown in fig. 6, the maximum included angle A4 between the axis of the first stem 11 and the axis of the second stem 21 is between 65 ° and 90 ° when the finger joint prosthesis is in a flexed state. By adopting the angle A4 in the range, the first finger joint 10 can rotate a certain angle relative to the second finger joint 20 to meet the daily life requirement of a patient, and when the finger joint prosthesis is in a bending state, the joint convex surface 121 is prevented from being separated from the joint concave surface 221.
In particular, the maximum included angle A4 between the axis of the first stem 11 and the axis of the second stem 21 can be 65 °, 70 °, 75 °, 80 °, 85 °, 90 °, and any value between 65 ° and 90 °.
In this embodiment, the first finger joint 10 is made of ultra-high molecular weight polyethylene or cross-linked polyethylene, and the second finger joint 20 is made of cobalt-chromium-molybdenum. The second finger joint 20 is made of cobalt chromium molybdenum materials, so that the second finger joint 20 has enough structural strength and avoids the deformation of the joint concave surface 221, the first finger joint 10 is made of ultra-high molecular weight polyethylene or cross-linked polyethylene, and when the first finger joint 10 rotates relative to the second finger joint 20, the generation of metal particles due to abrasion can be avoided.
In other embodiments, the first intramedullary rod 11 comprises a first rod segment and a first porous segment that are coaxially connected, wherein an end of the first rod segment that is away from the first porous segment is connected with the first joint 12, and a first porous structure is disposed on a side wall of the first porous segment. With the first rod in marrow 11, while the structural strength is maintained by the first polished rod section, the first porous structure is arranged on the side wall of the first porous section, so that after the rod is implanted into a human body, bone ingrowth is facilitated to improve the long-term stability of the first knuckle 10.
As shown in fig. 1, the second intramedullary rod 21 comprises a second rod segment 211 and a second porous segment 212 which are coaxially connected, wherein the end of the second rod segment 211 far away from the second porous segment 212 is connected with the second joint 22, and a second porous structure 2121 is arranged on the side wall of the second porous segment 212. With the above-described second intramedullary rod 21, while the structural strength is maintained by the second rod segment 211, by providing the second porous structure 2121 on the sidewall of the second porous segment 212, after being implanted into a human body, bone ingrowth is facilitated to improve the long-term stability of the second finger joint 20.
As shown in fig. 3, a third porous structure 23 is provided at an end of the second joint 22 near the second stem 21. By providing the third porous structure 23 at the end of the second joint 22 near the second intramedullary rod 21, bone ingrowth is facilitated to improve the long term stability of the second finger joint 20 after implantation into the human body.
Specifically, the first porous structure, the second porous structure 2121, and the third porous structure 23 are all manufactured and molded based on 3D printing, and the remaining components are all manufactured and molded based on subtractive materials.
By applying the technical scheme provided by the embodiment, the following beneficial effects are achieved:
(1) Because the first stop surface 1212 is tangent to the first spherical surface 1211, the second stop surface 2212 is tangent to the second spherical surface 2211, the first stop surface 1212 is parallel to the axis of the first intramedullary rod 11, and the second stop surface 2212 is parallel to the axis of the second intramedullary rod 21, when the finger joint prosthesis is in a straightened state, the first stop surface 1212 and the second stop surface 2212 are attached to each other, so that the first finger joint 10 is prevented from rotating to the back side relative to the second finger joint 20 by the stop effect of the second stop surface 2212 on the first stop surface 1212, and the finger joint prosthesis is prevented from being overextended;
(2) When the finger joint prosthesis is in a bending state, the maximum included angle A4 between the axis of the first intramedullary rod 11 and the axis of the second intramedullary rod 21 is between 65 degrees and 90 degrees, so that the first finger joint 10 can rotate relative to the second finger joint 20 for a certain angle to meet the daily life requirement of a patient, and when the finger joint prosthesis is in the bending state, the joint convex surface 121 is prevented from being separated from the joint concave surface 221.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
For ease of description, spatially relative terms such as "over 8230 \ 8230;,"' over 8230;, \8230; upper surface "," above ", etc. may be used herein to describe the spatial relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; 'above" may include both orientations "at 8230; \8230;' above 8230; 'at 8230;' below 8230;" above ". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A finger joint prosthesis, characterized in that it comprises:
the first knuckle (10) comprises a first intramedullary rod (11) and a first joint (12) arranged at one end of the first intramedullary rod (11), wherein a joint convex surface (121) is arranged at one end, far away from the first intramedullary rod (11), of the first joint (12);
the second finger joint (20) comprises a second intramedullary rod (21) and a second joint (22) arranged at one end of the second intramedullary rod (21), one end, far away from the second intramedullary rod (21), of the second joint (22) is provided with a joint concave surface (221), the first finger joint (10) can rotate relative to the second finger joint (20) through the joint convex surface (121) and the joint concave surface (221), the finger joint prosthesis has a straightened state and a bent state, when the finger joint prosthesis is in the straightened state, the extending direction of the axis of the first intramedullary rod (11) is the same as that of the axis of the second intramedullary rod (21), and when the finger joint prosthesis is in the bent state, the axis of the first intramedullary rod (11) and the axis of the second intramedullary rod (21) are arranged in an included angle;
wherein, convex joint surface (121) includes first sphere (1211) and with first backstop face (1212) tangent to first sphere (1211), concave joint surface (221) includes second sphere (2211) and with second backstop face (2212) tangent to second sphere (2211), first sphere (1211) with second sphere (2211) cooperatees, in the direction around the axis of rotation of first finger joint (10), the central angle of the arc of first sphere (1211) is greater than or equal to the central angle of the arc of second sphere (2211), first backstop face (1212) with the axis of first intramedullary rod (11) is parallel, second backstop face (2212) with the axis of second intramedullary rod (21) is parallel, when the finger joint prosthesis is in the unbent state, first backstop face (1212) with second backstop face (2212) is laminated.
2. A finger joint prosthesis according to claim 1, characterised in that the central angle of the arc of the second spherical surface (2211) in the direction around the axis of rotation of the first finger joint (10) is greater than or equal to 180 °.
3. The finger joint prosthesis according to claim 1, characterized in that a line between one end of the second stop surface (2212) far from the second spherical surface (2211) and one end of the second spherical surface (2211) far from the second stop surface (2212) is a preset line, and an included angle between the preset line and the axis of the second intramedullary rod (21) is between 110 ° and 135 °.
4. The finger joint prosthesis according to claim 1, characterized in that the central angle of the arc of the first spherical surface (1211) in the direction around the rotation axis of the first finger joint (10) is greater than or equal to 180 °.
5. A finger joint prosthesis according to any of claims 1-4 characterised in that the first spherical surface (1211) and the second spherical surface (2211) are each an ellipsoid, the long axis of which is the axis of rotation of the first finger joint (10).
6. The finger joint prosthesis according to any one of claims 1 to 4, characterized in that the maximum angle between the axis of the first stem (11) and the axis of the second stem (21) is between 65 ° and 90 ° when the finger joint prosthesis is in the flexed state.
7. Finger joint prosthesis according to one of the claims 1 to 4,
the first finger joint (10) is made of ultra-high molecular weight polyethylene or cross-linked polyethylene; and/or the presence of a gas in the gas,
the second finger joint (20) is made of cobalt, chromium and molybdenum materials.
8. The finger joint prosthesis according to any one of claims 1 to 4, wherein the first intramedullary rod (11) comprises a first light rod segment and a first porous segment which are coaxially connected, wherein one end of the first light rod segment, which is far away from the first porous segment, is connected with the first joint (12), and a first porous structure is arranged on the side wall of the first porous segment.
9. The finger joint prosthesis according to any one of claims 1 to 4, wherein the second intramedullary rod (21) comprises a second light rod section (211) and a second porous section (212) which are coaxially connected, wherein one end of the second light rod section (211) far away from the second porous section (212) is connected with the second joint (22), and a second porous structure (2121) is arranged on the side wall of the second porous section (212).
10. A finger joint prosthesis according to any one of claims 1 to 4 characterised in that the end of the second joint (22) adjacent to the second intramedullary rod (21) is provided with a third porous structure (23).
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| CN202310179976.9A CN115844598B (en) | 2023-02-14 | 2023-02-14 | Finger joint prosthesis |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310179976.9A CN115844598B (en) | 2023-02-14 | 2023-02-14 | Finger joint prosthesis |
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| CN115844598B CN115844598B (en) | 2023-07-07 |
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| CN111743666A (en) * | 2020-07-08 | 2020-10-09 | 北京中安泰华科技有限公司 | Implanted finger joint prosthesis |
| CN216417428U (en) * | 2021-12-27 | 2022-05-03 | 北京爱康宜诚医疗器材有限公司 | Finger joint prosthesis |
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| US5674297A (en) * | 1995-12-08 | 1997-10-07 | Lane; Lewis B. | Metacarpophalangeal prosthesis |
| JP2964035B1 (en) * | 1998-05-21 | 1999-10-18 | 有限会社エイド−ル | Fixed structure of artificial joint |
| US20010025199A1 (en) * | 2000-03-21 | 2001-09-27 | Markus Rauscher | Artificial finger joint |
| CN109481098A (en) * | 2018-12-04 | 2019-03-19 | 北京市春立正达医疗器械股份有限公司 | Toe joint prosthese |
| CN111743666A (en) * | 2020-07-08 | 2020-10-09 | 北京中安泰华科技有限公司 | Implanted finger joint prosthesis |
| CN216417428U (en) * | 2021-12-27 | 2022-05-03 | 北京爱康宜诚医疗器材有限公司 | Finger joint prosthesis |
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| CN115844598B (en) | 2023-07-07 |
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