CN218739258U - Talus prosthesis and anatomical ankle joint prosthesis talus assembly - Google Patents
Talus prosthesis and anatomical ankle joint prosthesis talus assembly Download PDFInfo
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- CN218739258U CN218739258U CN202222248818.8U CN202222248818U CN218739258U CN 218739258 U CN218739258 U CN 218739258U CN 202222248818 U CN202222248818 U CN 202222248818U CN 218739258 U CN218739258 U CN 218739258U
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- talar
- ankle joint
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Abstract
The utility model provides a talus false body and anatomical form ankle joint false body talus subassembly, wherein, talus false body includes talus false body, its top surface divide into inboard spherical cambered surface and outside spherical cambered surface, the curvature radius of inboard spherical cambered surface is greater than the curvature radius of outside spherical cambered surface, the curvature radius of inboard spherical cambered surface diminishes in succession along the direction from the past backward, the bottom surface is the plane, medial surface and lateral surface are the plane of perpendicular to bottom surface and both are the contained angle setting, talus false body can make patient's ankle joint resume the activity function better after the operation, realize three planar motion, and the motion of plantarflexion of non-pure back stretching, more accord with the anatomy characteristics of Asian ankle joint talus vault. Talus subassembly includes talus false body and slope and connects interior anchor and the outer anchor at the bottom surface, and interior anchor and outer anchor are used for inserting talus neck rear, can increase the initial stability after talus false body installs, reduce the influence to talus blood supply, reduce the emergence of the talus necrotic condition after the installation.
Description
Technical Field
The utility model relates to a medical false body technical field, concretely relates to talus false body and talus subassembly.
Background
The ankle joint comprises the distal joint surfaces of the tibia and the fibula and the talus pulley, and the distal joint surface of the tibia and the joint sockets formed by the inner and outer ankle joint surfaces, also called ankle points, accommodate the talus pulley, where the talus rotates. Ankle arthritis is a disabling disease occurring in the ankle joint and may be caused by degenerative diseases, wounds, rheumatic immune diseases, and the like. Ankle arthritis progresses to the terminal stage, joint pain occurs, activity is limited, the quality of life of people is seriously affected, and serious economic burden is brought. The artificial ankle joint replacement is an important means for treating the final stage ankle arthritis, and partial tibia and talus structures are replaced by the artificial ankle joint prosthesis, so that the ankle joint function of a patient is restored, and pain is relieved. However, the clinical effect of the current ankle joint prosthesis is still worse than that of the knee joint and the hip joint, the failure rate of the prosthesis is high, and one of the reasons for the failure analysis is that the anatomical features of the tibia and the talus and the change of the artificial ankle joint prosthesis during movement are not completely considered in the design of the artificial ankle joint prosthesis.
Research shows that the rotation of talus in ankle acupuncture point is many rotation axes, and the radius differs, and not simple single selection axle motion, and the rotation is certain inclination, and the camber of talus coaster inside and outside should be different. Therefore, based on the characteristics of the ankle joint anatomy and motion, the artificial ankle joint prosthesis which accords with the ankle joint anatomy and kinematic data of the nation is designed in an effort to help improve the clinical effect of the artificial ankle joint prosthesis and improve the benefit of a patient after the artificial ankle joint replacement.
SUMMERY OF THE UTILITY MODEL
The present invention has been made to solve the above problems, and an object of the present invention is to provide a talar prosthesis and an anatomical ankle prosthesis talar assembly.
The utility model provides a talus prosthesis, which has the characteristics that the talus prosthesis comprises a talus prosthesis body, the talus prosthesis body is provided with a top surface, a bottom surface, an inner side surface and an outer side surface, the top surface is divided into an inner spherical cambered surface and an outer spherical cambered surface, a concave seam is formed at the junction of the inner spherical cambered surface and the outer spherical cambered surface at the top of the talus, the bottom surface is a plane, the inner side surface and the outer side surface are both planes vertical to the bottom surface, and the inner side surface and the outer side surface are arranged at an included angle; wherein, the radius of curvature of inboard spherical cambered surface is greater than the radius of curvature of outside spherical cambered surface to, the radius of curvature of inboard spherical cambered surface diminishes along the direction from the front to back in succession.
In the talar prosthesis provided by the present invention, such features may also be provided: the radius of curvature of the outboard spherical camber remains constant.
In the talus prosthesis provided by the present invention, such features may also be provided: the included angle between the inner side surface and the outer side surface is arranged forwards.
Furthermore, the included angle between the inner side surface and the outer side surface is 9-13 degrees.
The utility model also provides an anatomical form ankle joint prosthesis talus bone subassembly has such a characteristic, include: the talar prosthesis described above; the internal anchoring piece is connected to the inner front part of the bottom surface of the talar prosthesis body and is used for being inserted behind the talar neck; and an outer anchor connected to an outer front portion of the bottom surface of the talar prosthesis body for insertion behind the talar neck.
In the anatomical ankle prosthesis talus assembly provided by the present invention, such a feature may also be provided: the inner anchoring piece and the outer anchoring piece are inclined backward at the free ends by 45-60 degrees relative to the bottom surface.
Further, the inner anchoring member and the outer anchoring member each include a columnar portion connected to the bottom surface and a hemispherical portion as a free end.
Further, the length of the columnar portion is 2 to 8cm, and the radius of the hemispherical portion is 2 to 4mm.
Action and effect of the utility model
According to the talus prosthesis and the anatomical ankle joint prosthesis talus component related to by the utility model, because the top surface of talus prosthesis body is divided into the inner spherical cambered surface and the outer spherical cambered surface, the curvature radius of the inner spherical cambered surface is greater than the curvature radius of the outer spherical cambered surface, the anatomical characteristics that the inner dome surface and the outer dome surface of the talus of the asian ankle joint are asymmetric are met, the curvature radius of the inner spherical cambered surface is continuously reduced along the direction from the front to the back, and the anatomical characteristics that the curvature radius of the inner dome surface of the talus of the asian ankle joint is continuously changed in the front and back directions are met, therefore, the talus prosthesis can enable the ankle joint of a patient to better recover the activity function after the operation, realize the motion of three planes, and the non-pure back stretching plantar flexion motion is realized, and the anatomical characteristics of the talus dome surface of the asian ankle joint are better met; because the inboard front portion of the bottom surface of talus false body is connected with interior anchor, and the outside front portion of bottom surface is connected with outer anchor, and when talus subassembly installation, interior anchor and outer anchor insert talus neck rear from the top in the past downwards, can increase the initial stability after talus false body installation, so, the utility model discloses a talus subassembly can reduce the influence to talus blood supply, reduces the emergence of the necrotic condition of talus behind the installation of talus false body.
Drawings
FIG. 1 is a schematic view of an anatomical ankle prosthesis talar assembly according to an embodiment of the invention;
FIG. 2 is another schematic illustration of an anatomical ankle prosthesis talar component according to an embodiment of the present invention;
FIG. 3 is a schematic view of the medial side of an anatomical ankle prosthesis talar component in an embodiment of the invention;
FIG. 4 is a schematic view of an anatomical ankle prosthesis talus assembly in a bottom view according to an embodiment of the present invention;
fig. 5 is a schematic view of the ankle component of the anatomical ankle prosthesis according to the embodiment of the present invention in a top view.
Description of the reference numerals:
10 talar prosthesis; 11 a top surface; 111 inner spherical cambered surface; 112 outer spherical cambered surface; 113 talus crest concavity; 12 a bottom surface;
13 inner side surface; 14 lateral surface; 20 an inner anchor; 30 outer anchoring member.
Detailed Description
In order to make the technical means, creation characteristics, achievement purpose and efficacy of the utility model easy to understand, the following embodiments are combined with the drawings to specifically explain the utility model.
Examples
Fig. 1 to 5 are schematic views of the anatomical ankle prosthesis talus assembly from different perspectives.
As shown in fig. 1-5, the present embodiment provides an anatomical ankle prosthesis talar assembly that includes a talar prosthesis 10, an inner anchor 20, and an outer anchor 30.
The talar prosthesis 10 is intended to be mounted on the calcaneus bone with the medial side of the talar prosthesis 10 being closer to the tibia than the lateral side and the anterior side of the talar prosthesis 10 being closer to the toes than the posterior side.
As shown in FIGS. 1 and 2, the top surface 11 conforms to the anatomical features of the Asian ankle joint talus vault and is divided into a medial spherical arc 111 and a lateral spherical arc 112. The junction of the medial spherical arc 111 and the lateral spherical arc 112 forms a talus crest notch 113. It should be noted that the "talus crest notch 113" is formed naturally by the junction of the two spherical arcs, and is not a structure of additional machining at the junction. The curvature radius of the inner spherical cambered surface 111 is larger than that of the outer spherical cambered surface 112, and the design is more in line with the asymmetric anatomical characteristics of the inner dome surface and the outer dome surface of the talus of the ankle joint of Asian people. As shown in FIG. 3, the radius of curvature of the medial spherical arc 111 decreases continuously from anterior to posterior, which is more consistent with the anatomical features of Asian ankle joint talus medial dome that continuously changes in radius of curvature in the anterior-posterior direction. The radius of curvature of the lateral spherical-shaped arc 112 remains constant and the design is more anatomically correct for the radius of curvature of the lateral vault of the Asian ankle joint.
As shown in FIG. 4, the bottom surface 12 is a plane, and only one osteotomy is needed for installation, which is simple and convenient. The bottom surface 12 is connected with an inner anchor 20 and an outer anchor 30, the inner anchor 20 is arranged at the inner front part of the bottom surface 12, and the outer anchor 30 is arranged at the outer front part of the bottom surface 12. Referring to fig. 1 and 3, the inner anchor 20 and the outer anchor 30 have the same structure, and both have free ends inclined backward by 45-60 ° with respect to the bottom surface 12, and both the inner anchor 20 and the outer anchor 30 include a columnar portion connected to the bottom surface 12 and a hemispherical portion serving as a free end, the length of the columnar portion is 2-8 cm, and the radius of the hemispherical portion is 2-4 mm. Internal anchor 20 and external anchor 30 are used for inserting talus neck rear downwards from the anteroposterior to increase the initial stability behind the installation of talus prosthesis body, thereby can reduce the influence to the talus blood supply, reduce the emergence of the necrotic condition of talus behind the installation of talus prosthesis body.
As shown in fig. 5, the inner side surface 13 and the outer side surface 14 are both planes perpendicular to the bottom surface 12, an included angle is formed between the inner side surface 13 and the outer side surface 14, the included angle faces forwards, so that the inner side surface 13 and the outer side surface 14 are arranged to be wide in the front and narrow in the back, the included angle is 9-13 degrees, and the structure characteristics and the narrowing amplitude of the ankle joint talus bone narrowing from the front side to the back side are met.
Effects and effects of the embodiments
According to the anatomical ankle joint prosthesis talus component related to the embodiment, the top surface of the talus prosthesis body is divided into the inner spherical cambered surface and the outer spherical cambered surface, the curvature radius of the inner spherical cambered surface is larger than that of the outer spherical cambered surface, the anatomical characteristics that the inner dome surface and the outer dome surface of the talus of the Asian ankle joint are asymmetric are met, the curvature radius of the inner spherical cambered surface is continuously reduced along the front-to-back direction, and the anatomical characteristics that the curvature radius of the inner dome surface of the talus of the Asian ankle joint is continuously changed in the front-to-back direction are met, so that the talus prosthesis can enable the ankle joint of a patient to better recover the activity function after operation, the motion of three planes is realized, the pure stretching and plantarflexion motion is not realized, and the anatomical characteristics of the talus dome surface of the ankle joint of the Asian ankle joint are better met; because the inboard front portion of the bottom surface of talus false body is connected with interior anchor, and the outside front portion of bottom surface is connected with outer anchor, and when talus subassembly installation, interior anchor and outer anchor insert talus neck rear downwards from the anteriorly top, can increase the initial stability behind the installation of talus false body, so, the talus subassembly can reduce the influence to the talus blood supply, reduces the emergence of the necrotic condition of talus after the installation of talus false body.
Wherein, the curvature radius of the outer spherical cambered surface is kept unchanged, and the anatomical characteristics of the curvature radius of the outer dome surface of the talus of the ankle joint of Asian people are better met.
The included angle between the inner side surface and the outer side surface is arranged forwards and is 9-13 degrees, so that the structure characteristic and the narrowing amplitude of the ankle joint talus narrowing from the front side to the back side are more met.
The inner anchoring piece and the outer anchoring piece are inclined 45-60 degrees backwards relative to the bottom surface of the talar prosthesis body, the columnar portion is used as a main body, the hemispherical portion is used as a structure of the free end, the length of the columnar portion is preferably 2-8 cm, the radius of the hemispherical portion is preferably 2-4 mm, and the structure accords with the optimal mechanical structure design.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (8)
1. A talus prosthesis comprises a talus prosthesis body, wherein the talus prosthesis body is provided with a top surface, a bottom surface, an inner side surface and an outer side surface, the top surface is divided into an inner spherical arc surface and an outer spherical arc surface, a talus top concave seam is formed at the joint of the inner spherical arc surface and the outer spherical arc surface, the bottom surface is a plane, and the inner side surface and the outer side surface are both planes vertical to the bottom surface and form an included angle; the method is characterized in that:
the curvature radius of the inner spherical cambered surface is larger than that of the outer spherical cambered surface, and the curvature radius of the inner spherical cambered surface is continuously reduced along the direction from the front to the back.
2. The talar prosthesis of claim 1, wherein:
wherein the radius of curvature of the outboard spherical camber remains constant.
3. The talar prosthesis of claim 1, wherein:
wherein, the medial surface with the contained angle between the lateral surface sets up forward.
4. The talar prosthesis of claim 3, wherein:
wherein the included angle between the inner side surface and the outer side surface is 9-13 degrees.
5. An anatomical ankle prosthesis talus assembly, comprising:
the talar prosthesis of any one of claims 1 to 4;
the internal anchoring piece is connected to the inner front part of the bottom surface of the talar prosthesis body and is used for being inserted behind the talar neck; and
an outer anchor is attached to the outer front portion of the bottom surface of the talar prosthesis body for insertion behind the talar neck.
6. The anatomical ankle prosthesis talus assembly of claim 5, wherein:
wherein the inner anchoring piece and the outer anchoring piece are inclined 45-60 degrees relative to the bottom surface with free ends facing backwards.
7. The anatomical ankle prosthesis talar assembly according to claim 6, wherein:
the inner anchoring piece and the outer anchoring piece both comprise a columnar part connected with the bottom surface and a hemispherical part serving as a free end.
8. The anatomical ankle prosthesis talar assembly according to claim 7, wherein:
wherein the length of the columnar part is 2-8 cm, and the radius of the hemispherical part is 2-4 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222248818.8U CN218739258U (en) | 2022-08-25 | 2022-08-25 | Talus prosthesis and anatomical ankle joint prosthesis talus assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222248818.8U CN218739258U (en) | 2022-08-25 | 2022-08-25 | Talus prosthesis and anatomical ankle joint prosthesis talus assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218739258U true CN218739258U (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222248818.8U Active CN218739258U (en) | 2022-08-25 | 2022-08-25 | Talus prosthesis and anatomical ankle joint prosthesis talus assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218739258U (en) |
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2022
- 2022-08-25 CN CN202222248818.8U patent/CN218739258U/en active Active
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