Patent ID: 11957592
Assignee: nan
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A prosthetic meniscus device for placement in a knee joint, the prosthetic meniscus device having a substantially ellipsoidal shape and comprising:
a central portion having an upper femur-contacting surface for engagement with a portion of a femur and an opposing lower tibial-contacting surface for engagement with a portion of a tibia, the central portion comprising a resilient material;
an outer portion surrounding the central portion and having an increased thickness relative to the central portion, the outer portion comprising a resilient material with a reinforcement material embedded in the resilient material of the outer portion, the reinforcement material comprises at least one fiber disposed circumferentially around the central portion,
wherein the outer portion further comprises a retention structure sized and shaped to prevent posterior migration of the prosthetic meniscus device in the knee joint,
wherein the retention structure comprises a pocket formed on a posterior sidewall of the outer portion and sized to receive a posterior remnant of the meniscus,
wherein the pocket is disposed between a posteriorly extending inferior portion of the posterior sidewall and a vertically extending superior portion of the posterior sidewall,
wherein the posteriorly extending inferior portion is oriented in a lateral direction and the vertically extending superior portion is oriented in a superior-inferior direction such that the posteriorly extending inferior portion and the vertically extending superior portion are substantially perpendicular to one another,
wherein the pocket comprises a concave shape defined at least in part by a superior surface of the posteriorly extending inferior portion and a side-facing surface of the vertically extending superior portion,
wherein the posteriorly extending inferior portion defines a plow blade shape configured to slide under at least a portion of the posterior remnant,
wherein the posteriorly extending inferior portion comprises a leading lower edge and the vertically extending superior portion comprises an upper edge,
wherein the leading lower edge extends further posteriorly than the upper edge,
wherein the retention structure is configured to inhibit extreme movement of the prosthetic meniscus device within the knee joint while permitting free floating of the prosthetic meniscus device over a significant range.