US 10,537,433 B2Granted

Ligament reconstruction type artificial knee joint

AssigneeNational University Corporation Ehime University

InventorsHiromasa Miura, Kazunori Hino

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Abstract

There is provided a ligament reconstruction type artificial knee joint that can exert a function of an anterior cruciate ligament in an original knee joint. In an artificial knee joint 1 used in a total knee replacement, the artificial knee joint 1 includes: a femur member 10 mounted on a femur distal end DT; a tibia member 20 mounted on a tibia proximal end PE; and an artificial ligament 30 coupling the tibia member 20 and the femur member 10 together. One end of the artificial ligament 30 is coupled to a position where once an anterior cruciate ligament ACL exists in a knee replaced for the artificial knee joint 1 on an inside of a lateral condyle of the femur member 10, and the other end of the artificial ligament 30 is coupled to a position where once the anterior cruciate ligament ACL exists in the knee replaced for the artificial knee joint 1 on an upper side of the tibia member 20.

Claims15

Dependent claims

A ligament reconstruction type artificial knee joint used in a total knee replacement of an original knee, the artificial knee joint comprising:

a femur member configured to be mounted on a femur distal end;
a tibia member configured to be mounted on a tibia proximal end;
a ring-shaped artificial ligament configured to couple the tibia member and the femur member together, wherein the artificial ligament, as a whole, is a ring shape;
and
a coupling member to which the artificial ligament is configured to be coupled,
wherein the femur member includes a wall-shaped lateral condyle inside wall, which is disposed on a side of a lateral condyle of the femur member that is closest to a medial condyle of the femur member,
wherein the femur member includes an engagement part in the lateral condyle inside wall on which one end of the artificial ligament is configured to be hooked, wherein, when the femur member is mounted on the femur distal end, the engagement part is at a position where at least a portion of an anterior cruciate ligament was previously positioned in the original knee, such that the artificial ligament pierces the lateral condyle inside wall,
wherein the tibia member defines a fixing hole on an upper side of the tibia member in which the coupling member is configured to be fixedly inserted, wherein the fixing hole is at a position where at least a portion of the anterior cruciate ligament was previously positioned in the original knee,
wherein the coupling member defines a pair of through-holes extending through one end face of the coupling member, and the artificial ligament is hooked to the coupling member when the artificial ligament is inserted in the pair of through-holes,
wherein the engagement part defines a pair of engagement holes on which the artificial ligament is hooked to the engagement part, and
the pair of engagement holes is configured such that a twist is generated in the artificial ligament when the artificial ligament is hooked to the coupling member and the engagement part and when the coupling member is mounted in the fixing hole of the tibia member.

8 more elements

A ligament reconstruction type artificial knee joint used in a total knee replacement of an original knee, the artificial knee joint comprising:

a femur member configured to be mounted on a femur distal end;
a tibia member configured to be mounted on a tibia proximal end;
an artificial ligament configured to couple the tibia member and the femur member together, wherein the artificial ligament includes a plurality of ligament members that are each, as a whole, in a ring shape;
and
a femur coupling member and a tibia coupling member, which are configured to be coupled to the artificial ligament,
wherein the femur member includes a wall-shaped lateral condyle inside wall, which is disposed on a side of a lateral condyle of the femur member that is closest to a medial condyle of the femur member,
wherein the femur member defines a femur fixing hole in the lateral condyle inside wall in which the femur coupling member is configured to be fixed, wherein, when the femur member is mounted on the femur distal end, the femur fixing hole is at a position where at least a portion of an anterior cruciate ligament was previously positioned in the original knee,
wherein the tibia member defines a tibia fixing hole on an upper side of the tibia member in which the tibia coupling member is configured to be fixed, wherein the tibia fixing hole is at a position where at least a portion of the anterior cruciate ligament was previously positioned in the original knee,
wherein, when the femur coupling member is fixed in the femur fixing hole on the lateral condyle inside wall of the femur member, the plurality of ligament members are coupled to the femur coupling member such that one end of each of the plurality of ligament members is disposed within a certain area that includes a center portion of where at least a portion of the anterior cruciate ligament was previously positioned in the original knee,
wherein, when the tibia coupling member is fixed in the tibia fixing hole on the upper side of the tibia member, the plurality of ligament members are coupled to the tibia coupling member such that the other end of each of the plurality of ligament members is disposed within a certain area that includes a center portion of where at least a portion of the anterior cruciate ligament was previously positioned in the original knee, and
the femur coupling member and the tibia coupling member are configured to be mounted on the femur member and the tibia member, respectively, such that a twist is generated in the plurality of ligament members between the femur coupling member and the tibia coupling member.

8 more elements

Dependencies are inferred from the claim text.