CN115607342A - Artificial ankle joint prosthesis talus implant - Google Patents

Artificial ankle joint prosthesis talus implant Download PDF

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Publication number
CN115607342A
CN115607342A CN202211121431.4A CN202211121431A CN115607342A CN 115607342 A CN115607342 A CN 115607342A CN 202211121431 A CN202211121431 A CN 202211121431A CN 115607342 A CN115607342 A CN 115607342A
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China
Prior art keywords
outer side
lateral
talus
ankle joint
arc surface
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CN202211121431.4A
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Chinese (zh)
Inventor
喻健
马昕
赵大航
王旭
黄加张
张超
陈立
王晨
耿翔
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Huashan Hospital of Fudan University
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Huashan Hospital of Fudan University
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Priority to CN202211121431.4A priority Critical patent/CN115607342A/en
Publication of CN115607342A publication Critical patent/CN115607342A/en
Pending legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/42—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes
    • A61F2/4202—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for ankles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/42—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes
    • A61F2/4202—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for ankles
    • A61F2002/4205—Tibial components
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/42—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes
    • A61F2/4202—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for ankles
    • A61F2002/4207—Talar components

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Abstract

The invention provides an artificial ankle joint prosthesis talus implant which is used for being installed on a calcaneus and comprises a talus prosthesis body, wherein the talus prosthesis body comprises an inner side part and an outer side part which are connected into a whole, the bottom surface of the inner side part and the bottom surface of the outer side part are connected and coplanar planes, the top surface of the inner side part and the top surface of the outer side part are both spherical cambered surfaces, a talus top concave seam is formed at the joint of the two parts, the inner side surface of the inner side part and the outer side surface of the outer side part are both planes vertical to the bottom surfaces, and the inner side surface of the inner side part and the outer side surface of the outer side part are arranged in a way that the opening directions of the inner side part and the outer side surface form an included angle forward; the curvature radius of the inner side top surface is larger than that of the outer side top surface, and the distance between the highest point of the inner side top surface and the bottom surface is larger than that between the highest point of the outer side top surface and the bottom surface. This talus implant accords with the asymmetric anatomy characteristics of asian people's ankle joint talus inside and outside vault face, is used in the ankle joint replacement operation, can avoid causing the ankle joint kinematics unusual after the ankle joint replacement operation.

Description

Artificial ankle joint prosthesis talus implant
The application is a divisional application with the application number of 2020110138047, the application date of 2020-09-24 and the invention name of 'artificial ankle joint prosthesis assembly'.
Technical Field
The invention relates to the technical field of medical prostheses, in particular to an artificial ankle joint prosthesis talus implant.
Background
The ankle joint is composed of the distal joint surfaces of the tibia and the fibula and the talus pulley, and the joint socket, also called ankle socket, formed by the distal joint surface of the tibia and the inner and outer ankle joint surfaces accommodates 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, etc. The incidence rate of ankle arthritis in the world is about 1%, and according to the estimation, the number of patients suffering from ankle arthritis in China exceeds about 100 ten thousand. Ankle arthritis progresses to the terminal stage, joint pain occurs, movement is limited, the life quality of people is seriously influenced, and a 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 of 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 the talus at the ankle point forms a certain inclination angle, and the curvatures of the inner side and the outer side of the talus pulley are different. Therefore, based on this anatomy of ankle joint and motion characteristics, this application is dedicated to design an artificial ankle joint prosthesis ankle bone implant that accords with asian ankle joint structure and kinematics to help improving artificial ankle joint prosthesis's clinical effect and improving the benefit of patient after artificial ankle joint replacement.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide an artificial ankle joint prosthetic talus implant.
The invention provides an artificial ankle joint prosthesis talus implant which is used for being installed on a calcaneus and has the characteristics that the artificial ankle joint prosthesis comprises a talus prosthesis body, the talus prosthesis body comprises an inner side part and an outer side part which are connected into a whole, the bottom surface of the inner side part and the bottom surface of the outer side part are connected and coplanar planes, the top surfaces of the inner side part and the outer side part are both spherical cambered surfaces, a talus top concave seam is formed at the joint of the top surfaces of the inner side part and the outer side part, the inner side surface of the inner side part and the outer side surface of the outer side part are both planes vertical to the bottom surfaces, and the inner side surface of the inner side part and the outer side surface of the outer side part are arranged in an included angle with the opening direction facing forwards; the curvature radius of the inner side top surface is larger than that of the outer side top surface, and the distance between the highest point of the inner side top surface and the bottom surface is larger than that between the highest point of the outer side top surface and the bottom surface.
In the artificial ankle joint prosthesis talus implant provided by the invention, the artificial ankle joint prosthesis talus implant can also have the following characteristics: the inner side part comprises an inner side front part and an inner side rear part which are connected, the top surface of the inner side front part is an inner side front top arc surface, the top surface of the inner side rear part is an inner side rear top arc surface, and the inner side front top arc surface and the inner side rear top arc surface are tangent to form a spherical arc surface and are both downwards sunken along the direction from inside to outside; the outer side part comprises an outer side front part and an outer side rear part which are connected, the top surface of the outer side front part is an outer side front top arc surface, the top surface of the outer side rear part is an outer side rear top arc surface, and the outer side front top arc surface and the outer side rear top arc surface are tangent to form a spherical arc surface and are both sunken downwards along the direction from outside to inside; the top of the junction of the inner front part and the outer front part forms a front side concave joint, the top of the junction of the inner rear part and the outer rear part forms a rear side concave joint, and the front side concave joint and the rear side concave joint are connected to form a talus top concave joint.
In the artificial ankle joint prosthesis talus implant provided by the invention, the artificial ankle joint prosthesis talus implant can also have the following characteristics: the radius of the inner front top arc surface is equal to the radius of the inner rear top arc surface and is larger than the radius of the outer front top arc surface and the radius of the outer rear top arc surface, the tangent position of the inner front top arc surface and the inner rear top arc surface is the highest point of the inner top surface, and the tangent position of the outer front top arc surface and the outer rear top arc surface is the highest point of the outer top surface.
Further, the radius of the outer side front top arc surface is equal to the radius of the outer side rear top arc surface.
In the artificial ankle joint prosthesis talus implant provided by the invention, the artificial ankle joint prosthesis talus implant can also have the following characteristics: the anterior arbitrary plane parallel to the internal and external directions of the talar prosthesis body and perpendicular to the bottom surface is an anterior vertical plane, the intersection line of any anterior vertical plane and the external side surface of the inner anterior part is an anterior intersection line, the distance between the anterior intersection line and the internal side surface of the inner anterior part is the width of the inner anterior part along the internal and external directions of the talar prosthesis body, the distance between the anterior intersection line and the external side surface of the outer anterior part is the width of the outer anterior part, the width of the inner anterior part and the width of the outer anterior part are sequentially reduced along the front and back directions of the talar prosthesis body, and on the same anterior vertical plane, the width of the inner anterior part is greater than the width of the outer anterior part; be on a parallel with the arbitrary plane of rear portion of inside and outside direction and perpendicular to bottom surface of talus false body and be the rear portion vertical surface, arbitrary rear portion vertical surface is the rear portion intersecting line with the crossing intersecting intersection line of the lateral surface at inboard rear portion, along the inside and outside direction of talus false body, distance between the medial surface at rear portion and inboard rear portion of rear portion is the width at inboard rear portion, distance between rear portion intersecting line and the lateral surface at outside rear portion is the width at outside rear portion, along the fore-and-aft direction of talus false body, the width at inboard rear portion and the width at outside rear portion are reducing in proper order, and on same rear portion vertical surface, the width at inboard rear portion is greater than the width at outside rear portion.
In the artificial ankle joint prosthesis talus implant provided by the invention, the artificial ankle joint prosthesis talus implant also has the following characteristics: the front side of the front part of the inner side is a backward sunken arc line, the rear side of the rear part of the inner side is a forward sunken arc line, the front side of the front part of the outer side is a backward sunken arc line, and the rear side of the rear part of the outer side is a forward sunken arc line.
Furtherly, the crossing department of top arc face before the inboard and the anterior medial surface of inboard is equipped with first inboard preceding fillet portion, the front side of first inboard preceding fillet portion is the arc limit, the crossing department of inboard top arc face and the medial surface at inboard rear portion is equipped with first inboard back fillet portion, the back side of first inboard back fillet portion is the arc limit, the crossing department of top arc face before the outside and the anterior lateral surface in the outside is equipped with first outside preceding fillet portion, the front side of first outside preceding fillet portion is the arc limit, the crossing department of top arc face and the lateral surface at outside rear portion is equipped with first outside back fillet portion after the outside, the back side of first outside back fillet portion is the arc limit.
Further, the front side of the first inner front fillet is tangent to the front side of the inner front portion, the first inner rear fillet (the rear side of which is tangent to the rear side of the inner rear portion, the front side of the first outer front fillet is tangent to the front side of the outer front portion, and the rear side of the first outer rear fillet is tangent to the rear side of the outer rear portion).
In the artificial ankle joint prosthesis talus implant provided by the invention, the artificial ankle joint prosthesis talus implant can also have the following characteristics: further comprising: the inner anchoring piece is connected to the front part of the bottom surface of the inner side part and is used for being inserted behind the talar neck; and an outer anchor connected to a front portion of a bottom surface of the outer side portion for insertion behind the talar neck.
Furthermore, the inner anchoring piece and the outer anchoring piece are arranged in a mode that the free ends of the inner anchoring piece and the outer anchoring piece are inclined backwards relative to the bottom surface.
Action and Effect of the invention
According to the artificial ankle joint prosthesis talus implant, the inner side top surface and the outer side top surface of the talus prosthesis body are both spherical cambered surfaces, the curvature radius of the inner side top surface is larger than that of the outer side top surface, and the height of the highest point of the inner side top surface is larger than that of the highest point of the outer side top surface, so that the artificial ankle joint prosthesis talus implant conforms to the asymmetric anatomical characteristics of the inner and outer dome surfaces of the talus of Asian, and can be used in an ankle joint replacement surgery to avoid the occurrence of ankle joint kinematic abnormality after the ankle joint replacement surgery.
Drawings
FIG. 1 is a schematic representation of a medial perspective view of an artificial ankle joint prosthetic talar implant in an embodiment of the present invention;
FIG. 2 is a schematic representation of the lateral perspective of a prosthetic ankle implant according to an embodiment of the present invention;
FIG. 3 is a front view of a prosthetic ankle joint talar implant according to an embodiment of the present invention;
FIG. 4 is a rear view of an artificial ankle joint prosthetic talar implant in an embodiment of the present invention;
FIG. 5 is a left side view of an embodiment of the present invention of a prosthetic ankle joint talar implant;
FIG. 6 is a right side view of an artificial ankle joint prosthetic talar implant in an embodiment of the present invention;
FIG. 7 is a top view of an artificial ankle joint prosthetic talar implant in an embodiment of the present invention;
FIG. 8 is a bottom view of a prosthetic ankle joint talar implant in accordance with an embodiment of the present invention.
Description of reference numerals:
100 talar prosthesis body; 101 a bottom surface; 110 an inboard front portion; 111 inner front top arc surface; 112 medial anterior medial surface; 113 front side of the inner front part; 114 a first inside front fillet; 120 medial posterior portion; a rear top arc surface at the inner side of 121; 122 medial surface of medial posterior portion; 123 rear side of medial posterior portion; 124 a first inner rear fillet; 130 outer front portion; 131 outer front top arc surface; 132 lateral anterior lateral side; 133 front side edge of the outer front portion; 134 first outer front rounded corner; 140 lateral posterior; 141 rear top arc surface of outer side; 142 lateral posterior lateral side; 143 rear lateral side of the lateral posterior portion; 144 first outside rear fillet; 150 front side depressed seam; 160 posterior concave seam; 210 an inner anchor; 220 an outer anchor; a highest point at the tangent position of the outer side front top circular arc surface and the outer side rear top circular arc surface.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the following embodiments are specifically explained in the following with the attached drawings.
Examples
Fig. 1 is a schematic medial perspective view of a prosthetic ankle implant, fig. 2 is a schematic lateral perspective view of a prosthetic ankle implant, fig. 3 is a front view of a prosthetic ankle implant, and fig. 4 is a rear view of a prosthetic ankle implant.
As shown in fig. 1 to 4, the present embodiment provides an artificial ankle joint prosthetic talus implant for mounting on the calcaneus bone with the medial side closer to the tibia than the lateral side and the anterior side closer to the toes than the posterior side. The talar implant generally includes a talar prosthesis body 100.
Talar prosthesis body 100 includes a medial portion and a lateral portion that are integrally connected. The bottom surfaces of the medial and lateral portions are planar and coplanar to form a bottom surface 101 of the talar prosthesis body 100. The top surface of the inner side part and the top surface of the outer side part are both spherical cambered surfaces, and the curvature radius of the top surface of the inner side part is larger than that of the top surface of the outer side part.
The inner and outer portions will be described in further detail below.
The inside portion is including inboard anterior 110 and inboard rear portion 120 that connects, and the top surface of inboard anterior 110 is inboard top circular arc face 111 before being inboard, and the top surface of inboard rear portion 120 is inboard top circular arc face 121 after, and inboard top circular arc face 111 forms the spherical cambered surface with inboard top circular arc face 121 is tangent, and inboard top circular arc face 111 before being inboard and inboard top circular arc face 121 after are all along sunken down from inside to outside direction to handing-over with outside portion.
The outer portion comprises an outer front portion 130 and an outer rear portion 140 which are connected, the top surface of the outer front portion 130 is an outer front top arc surface 131, and the top surface of the outer rear portion 140 is an outer rear top arc surface 141. The outer front top arc surface 131 and the outer rear top arc surface 141 are tangent to form a spherical arc surface, and both the outer front top arc surface 131 and the outer rear top arc surface 141 are downward concave in the direction from outside to inside and are connected with the inner side.
The structures of tangential transition are adopted between the arc surfaces in the inner side part and the outer side part, so that the influence of the change of curvature on joint movement is avoided.
The radius of the inner front top arc surface 111 is equal to that of the inner rear top arc surface 121, the radius of the inner front top arc surface 111 is larger than that of the outer front top arc surface 131, the radius of the inner rear top arc surface 121 is larger than that of the outer rear top arc surface 141, and the design not only meets the anatomical characteristics of the ankle joint talus vault surface of Asian people, but also meets the multi-radius asymmetric structural requirement of ankle joint kinematics.
The distance between the highest point of the tangent of the inner anterior top arc surface 111 and the inner posterior top arc surface 121 and the bottom surface 101 is the height of the inner highest tangent point, the distance between the highest point of the tangent of the outer anterior top arc surface 131 and the outer posterior top arc surface 141 and the bottom surface 101 is the height of the outer highest tangent point, and the height of the inner highest tangent point is greater than the height of the outer highest tangent point, so that the asymmetric anatomical characteristics of the highest point of the medial-lateral vault and the outer-lateral vault of the talus are met.
The lateral side of the medial anterior portion 110 is connected to and coplanar with the medial side of the lateral anterior portion 130, and the lateral side of the medial posterior portion 120 is connected to and coplanar with the medial side of the lateral posterior portion 140. The top of the junction of the medial anterior portion 110 and the lateral anterior portion 130 forms an anterior concave slot 150, the top of the junction of the medial posterior portion 120 and the lateral posterior portion 140 forms a posterior concave slot 160, and the anterior concave slot 150 joins the posterior concave slot 160 to form a talar top slot.
It is thus clear that this talus implant accords with asian's ankle joint's talus anatomy characteristics, can avoid ankle joint replacement surgery to cause the ankle joint kinematics unusual, can avoid talus implant to sink or talus implant and tissue around take place the striking.
Talar prosthesis body 100 is described in further detail below.
In the present embodiment, the radii of the inner front top arc surface 111 and the inner rear top arc surface 121 both range from 17 to 27mm. The radius of the outer front top arc surface 131 is equal to the radius of the outer rear top arc surface 141, and the radius ranges from 15 mm to 25mm. The highest point at the tangent of the inner front top arc surface 111 and the inner rear top arc surface 121 is 0.5-2.5 mm higher than the highest point a at the tangent of the outer front top arc surface 131 and the outer rear top arc surface 141. These designs are more consistent with the anatomical features of the talar vault of the asian ankle joint.
Any plane parallel to the medial-lateral direction of the talar prosthesis body 100 and perpendicular to the bottom surface 101 is defined as a frontal vertical plane, an intersection line where any one of the frontal vertical planes intersects the lateral surface of the medial frontal portion 110 is defined as a frontal intersection line, a distance between the frontal intersection line and the medial surface 112 of the medial frontal portion 110 along the medial-lateral direction of the talar prosthesis body 100 is defined as a width of the medial frontal portion 110, and a distance between the frontal intersection line and the lateral surface 132 of the lateral frontal portion 130 is defined as a width of the lateral frontal portion 130. In the present embodiment, as shown in fig. 3, the width of the medial anterior portion 110 and the width of the lateral anterior portion 130 are both reduced in order along the anterior-posterior direction of the talar prosthesis body 100, and the width of the medial anterior portion 110 is greater than the width of the lateral anterior portion 130 on the same anterior vertical plane.
Any plane parallel to the medial-lateral direction of the talar prosthesis body 100 and perpendicular to the bottom surface 101 is defined as a posterior vertical plane, the intersection line of any one of the posterior vertical planes with the lateral surface of the medial posterior portion 120 is defined as a posterior intersection line, the distance between the posterior intersection line and the medial surface 122 of the medial posterior portion 120 along the medial-lateral direction of the talar prosthesis body 100 is defined as the width of the medial posterior portion 120, and the distance between the posterior intersection line and the lateral surface 142 of the lateral posterior portion 140 is defined as the width of the lateral posterior portion 140. In the present embodiment, as shown in fig. 3, the width of the medial posterior portion 120 and the width of the lateral posterior portion 140 are both reduced in order along the anterior-posterior direction of the talar prosthesis body 100, and the width of the medial posterior portion 120 is greater than the width of the lateral posterior portion 140 on the same posterior vertical plane.
The above-described design with respect to width allows the configuration of the talar prosthesis body 100 in the width direction to better conform to the width-directional configuration of the asian ankle joint talus.
As shown in fig. 3 and 4, the inner side surface 112 of the medial front portion 110 and the inner side surface 122 of the medial rear portion 120 are coplanar and both perpendicular to the bottom surface 101, and the outer side surface 132 of the lateral front portion 130 and the outer side surface 142 of the lateral rear portion 140 are coplanar and both perpendicular to the bottom surface 101. The medial side 122 of the medial posterior portion 120 and the lateral side 142 of the lateral posterior portion 140 are disposed at an angle that opens forward, the angle A ranging from 9 to 13 degrees, and conforms to the structural characteristics and narrowing extent of the Asian ankle talus narrowing from the anterior side to the posterior side.
The front side 113 of the medial anterior portion 110 and the front side 133 of the lateral anterior portion 130 are both rearwardly concave arcs, and the rear side 123 of the medial posterior portion 120 and the rear side 143 of the lateral posterior portion 140 are both forwardly concave arcs, which conforms to the contour of the anterior and posterior sides of the ankle talus of asian, and can prevent the ankle talus implant from damaging soft tissues such as tendons or ligaments around the ankle after being installed on the calcaneus.
Further, the radius of the front side 113 of the inner front portion 110 ranges from 35 to 40mm, the radius of the rear side 123 of the inner rear portion 120 ranges from 34 to 39mm, the radius of the front side 133 of the outer front portion 130 ranges from 12 to 17mm, and the radius of the rear side 143 of the outer rear portion 140 ranges from 40 to 45mm.
Figure 5 is a left side view, figure 6 is a right side view, figure 7 is a top view, and figure 8 is a bottom view of a prosthetic ankle implant.
As shown in fig. 5 to 8, a first inner front rounded portion 114 is provided at the intersection of the inner top rounded surface 111 and the inner side surface 112 of the inner front portion 110, and the front side of the first inner front rounded portion 114 is a circular arc. A first inner rear rounded corner 124 is disposed at the intersection of the inner rear top arc 121 and the inner side surface 122 of the inner rear portion 120, and the rear side of the first inner rear rounded corner 124 is a circular arc. A first outer front rounded corner 134 is disposed at the intersection of the outer front top arc 131 and the outer side 132 of the outer front portion 130, and the front side of the first outer front rounded corner 134 is a circular arc. A first outer rear rounded corner portion 144 is arranged at the intersection of the outer rear top arc surface 141 of the outer rear portion 140 and the outer side surface 142, and the rear side edge of the first outer rear rounded corner portion 144 is an arc edge. The arrangement of the first inner front rounded corner 114, the first inner rear rounded corner 124, the first outer front rounded corner 134 and the first outer rear rounded corner 144 enables the contour of the talar implant to be smoother, and prevents the talar implant from being mounted on the calcaneus bone and then damaging soft tissues such as tendons or ligaments around the ankle joint.
Further, the radius of the front side of the first inner front rounded portion 114 ranges from 1 to 5mm, the radius of the rear side of the first inner rear rounded portion 124 ranges from 1 to 5mm, the radius of the front side of the first outer front rounded portion 134 ranges from 3 to 7mm, and the radius of the rear side of the first outer rear rounded portion 144 ranges from 2 to 6mm. The anterior side of the first medial anterior fillet 114 is tangent to the anterior side 113 of the medial anterior portion 110, the posterior side of the first medial posterior fillet 124 is tangent to the posterior side 123 of the medial posterior portion 120, the anterior side of the first lateral anterior fillet 134 is tangent to the anterior side 133 of the lateral anterior portion 130, and the posterior side of the first lateral posterior fillet 144 is tangent to the posterior side 143 of the lateral posterior portion 140, which results in a more rounded contour of the talar implant.
In order to enable the outline of the talar prosthesis body 100 to better conform to the outline structure of the talar bone of the ankle joint of the asian person, a connecting line formed by connecting the highest point at the tangent position of the inner front top circular arc surface 111 and the inner rear top circular arc surface 121 with the highest point a at the tangent position of the outer front top circular arc surface 131 and the outer rear top circular arc surface 141 is defined as a top connecting line, a plane which is perpendicular to the bottom surface 101 and passes through the top connecting line is a top vertical plane, and on the top vertical plane, a point which is perpendicular to the bottom surface 101 and a straight line which passes through the midpoint of the top connecting line is defined as a middle connecting point with the top surface of the talar prosthesis body 100. In this embodiment, the middle connection point is located at the intersection of the inner front top arc surface 111, the inner rear top arc surface 121, the outer front top arc surface 131 and the outer rear top arc surface 141, and the distance between the middle connection point and the midpoint of the top vertical surface through the top connection line is 0.5 to 3.5mm.
As shown in fig. 1 and 4 to 8, the artificial ankle joint prosthesis talar implant further comprises an inner anchor 210 and an outer anchor 220 connected to the bottom surface 101 of the talar prosthesis body 100, wherein the inner anchor 210 is located at the inner front portion 110, the outer anchor 220 is located at the outer front portion 130, and the inner anchor 210 and the outer anchor 220 are both inclined backward at a free end thereof by 45 to 60 ° with respect to the bottom surface. The inner anchor 210 and the outer anchor 220 have the same structure, and the inner anchor 210 is exemplified, as shown in fig. 1, the inner anchor 210 includes a columnar portion 211 connected to the bottom surface 101 and a hemispherical portion 212 connected to a free end of the columnar portion 211, the length of the columnar portion 211 is 2 to 8mm, and the length of the hemispherical portion 212 is 2 to 4mm. During the use, internal anchoring member 210 and external anchoring member 220 insert talus neck rear from the front upper place to the below, can increase talus prosthesis body 100 initial stability after the installation, and the design of this mounted position can reduce the influence to talus blood supply, reduces the emergence of the necrotic condition of talus after talus prosthesis body 100 installs.
Specific values for each parameter of the three talar implant products are in the following table:
Figure BDA0003846696250000081
effects and effects of the embodiments
According to the artificial ankle joint prosthesis talus implant that this embodiment relates to, because the inside top surface and the outside top surface of talus prosthesis body are spherical cambered surfaces to the curvature radius of inside top surface is greater than the curvature radius of outside top surface, and the peak height of inside top surface is greater than the height of the peak of outside top surface, so, this talus implant accords with the asymmetric anatomy characteristics of asian people's ankle joint talus ecto-lateral vault face, is used in the ankle joint replacement operation, can avoid causing the ankle joint kinematics unusual after the ankle joint replacement operation.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.

Claims (10)

1. An artificial ankle joint prosthesis talus implant for installation on the calcaneus, comprising a talus prosthesis body, characterized in that:
the talus prosthesis body comprises a medial part and a lateral part which are connected into a whole,
the bottom surface of the inner side part and the bottom surface of the outer side part are connected and coplanar planes, the top surface of the inner side part and the top surface of the outer side part are both spherical cambered surfaces, a talus top concave seam is formed at the joint of the two, the inner side surface of the inner side part and the outer side surface of the outer side part are both planes perpendicular to the bottom surfaces, and the inner side surface and the outer side surface of the inner side part are arranged in a way that the opening directions of the inner side part and the outer side surface form an included angle towards the front;
wherein a radius of curvature of the inner side top surface is greater than a radius of curvature of the outer side top surface, and a distance between a highest point of the inner side top surface and the bottom surface is greater than a distance between the highest point of the outer side top surface and the bottom surface.
2. The artificial ankle joint prosthetic talar implant of claim 1, wherein:
wherein the inner side part comprises an inner front part and an inner rear part which are connected,
the top surface of the front part of the inner side is an inner front top circular arc surface,
the top surface of the inner rear part is an inner rear top arc surface,
the inner side front top arc surface and the inner side rear top arc surface are tangent to form the spherical arc surface and are both downwards concave along the direction from inside to outside;
the lateral side portion comprises a lateral front portion and a lateral rear portion connected together,
the top surface of the front part of the outer side is an outer front top circular arc surface,
the top surface of the outer side rear part is an outer side rear top arc surface,
the outer side front top arc surface and the outer side rear top arc surface are tangent to form the spherical arc surface and are both downwards sunken along the direction from outside to inside;
the top of the joint of the inner front part and the outer front part forms a front side sunken seam,
the top of the junction of the medial posterior portion and the lateral posterior portion forms a posterior concave seam,
the anterior concave slot is connected with the posterior concave slot to form the talus top concave slot.
3. The prosthetic ankle joint talus implant of claim 2, wherein:
wherein the radius of the inner side front top arc surface is equal to the radius of the inner side rear top arc surface and is larger than the radius of the outer side front top arc surface and the radius of the outer side rear top arc surface,
the tangent position of the inner side front top arc surface and the inner side rear top arc surface is the highest point of the inner side top surface,
the tangent position of the outer side front top arc surface and the outer side rear top arc surface is the highest point of the outer side top surface.
4. The prosthetic ankle joint talus implant of claim 3, wherein:
and the radius of the outer side front top arc surface is equal to that of the outer side rear top arc surface.
5. The artificial ankle joint prosthetic talar implant of claim 2, wherein:
wherein any plane of the front part parallel to the inner and outer directions of the talus prosthesis body and vertical to the bottom surface is a front vertical plane, the intersection line of any one front vertical plane and the outer side surface of the inner front part is a front intersection line,
a distance between the anterior intersection line and a medial side of the medial anterior portion is a width of the medial anterior portion, and a distance between the anterior intersection line and a lateral side of the lateral anterior portion is a width of the lateral anterior portion, along a medial-lateral direction of the talar prosthesis body,
the width of the medial anterior portion and the width of the lateral anterior portion both decrease sequentially along an anterior-posterior direction of the talar prosthesis body, and the width of the medial anterior portion is greater than the width of the lateral anterior portion on a same anterior vertical plane;
any plane of the back part parallel to the inner and outer directions of the talus prosthesis body and vertical to the bottom surface is a back part vertical plane, the intersecting line of any one back part vertical plane and the outer side surface of the inner side back part is a back part intersecting line,
along the medial-lateral direction of the talar prosthesis body, the distance between the posterior intersection line and the inner lateral surface of the medial posterior portion is the width of the medial posterior portion, and the distance between the posterior intersection line and the outer lateral surface of the lateral posterior portion is the width of the lateral posterior portion,
the width of the medial posterior portion and the width of the lateral posterior portion both decrease sequentially along the anterior-posterior direction of the talar prosthesis body, and the width of the medial posterior portion is greater than the width of the lateral posterior portion on the same posterior vertical plane.
6. The artificial ankle joint prosthetic talar implant of claim 2, wherein:
wherein the front side edge of the front part of the inner side is a circular arc line which is concave backwards,
the rear side edge of the rear part of the inner side is a circular arc line which is sunken forwards,
the front side edge of the front part of the outer side is a circular arc line which is concave backwards,
the rear side edge of the rear part of the outer side is a forward sunken circular arc line.
7. The artificial ankle joint prosthetic talar implant of claim 6, wherein:
wherein a first inner front fillet part is arranged at the intersection of the inner front top arc surface and the inner side surface of the inner front part, the front side edge of the first inner front fillet part is an arc edge,
a first inner rear fillet part is arranged at the intersection of the inner rear top circular arc surface and the inner side surface of the inner rear part, the rear side edge of the first inner rear fillet part is a circular arc edge,
a first outer front fillet part is arranged at the intersection of the outer front top arc surface and the outer side surface of the outer front part, the front side edge of the first outer front fillet part is an arc edge,
the top arc surface behind the outside with the crossing department of the lateral surface at outside rear portion is equipped with fillet portion behind the first outside, the back side of fillet portion is the arc limit behind the first outside.
8. The artificial ankle joint prosthetic talar implant of claim 7, wherein:
wherein the front side of the first inner front fillet is tangent to the front side of the inner front,
the rear side of the first inside rear fillet is tangent to the rear side of the inside rear portion,
the front side of the first outside front fillet is tangent to the front side of the outside front,
the rear side of the first outside rear fillet is tangent to the rear side of the outside rear portion.
9. The prosthetic ankle joint talus implant according to any one of claims 1 to 8, further comprising:
the inner anchoring piece is connected to the front part of the bottom surface of the inner side part and is used for being inserted behind the talus neck; and
and the outer anchoring piece is connected to the front part of the bottom surface of the outer side part and is used for being inserted behind the talar neck.
10. The artificial ankle joint prosthetic talar implant of claim 9, wherein:
the inner anchoring piece and the outer anchoring piece are arranged in a mode that the free ends of the inner anchoring piece and the outer anchoring piece face backwards and are inclined relative to the bottom surface where the inner anchoring piece and the outer anchoring piece are arranged.
CN202211121431.4A 2020-09-24 2020-09-24 Artificial ankle joint prosthesis talus implant Pending CN115607342A (en)

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CN202011013804.7A CN114246709A (en) 2020-09-24 2020-09-24 Artificial ankle joint prosthesis assembly
CN202211121431.4A CN115607342A (en) 2020-09-24 2020-09-24 Artificial ankle joint prosthesis talus implant

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