ARTIFICIAL KNEE JOINT - JAPAN MEDICAL MATERIALS CORP

Title:

ARTIFICIAL KNEE JOINT

Document Type and Number:

WIPO Patent Application WO/2012/077755

Kind Code:

A1

Abstract:

Provided is an artificial knee joint with which the amount and rate of roll-back is lower with shallow bending and greater with deep bending. This artificial knee joint has: a femoral component (20) comprising a medial condyle (21), a lateral condyle (22), a first sliding surface (24) posteriorly coupling the medial condyle (21) and lateral condyle (22) and leaving an opening (23) therebetween, and a second sliding surface (25) above the first sliding surface (24); and a tibia plate (30) comprising a medial fossa (31), a lateral fossa (32), a post (36) protruding upward from between the medial fossa (31) and lateral fossa (32) and inserted into the opening (23), a third sliding surface (34) with which the first sliding surface (24) makes contact on the posterior surface of the post (36), and a fourth sliding surface (35) with which the second sliding surface (25) makes contact at a location posterior to the post part (36). The first and fourth sliding surfaces (24, 35) are convex curved surfaces, and the fourth sliding surface (35) is posterior to the third sliding surface (34); depending on the angle of bending, the joint is in either a first sliding state, where the first and third sliding surfaces (24, 34) make contact, or a second sliding state, where the second and fourth sliding surfaces (25, 35) make contact.

Inventors:

HASHIDA MASAHIKO (JP)

Application Number:

PCT/JP2011/078437

Publication Date:

June 14, 2012

Filing Date:

December 08, 2011

Export Citation:

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Assignee:

JAPAN MEDICAL MATERIALS CORP (JP)
HASHIDA MASAHIKO (JP)

International Classes:

A61F2/38

Domestic Patent References:

WO2007007841A1

2007-01-18

Foreign References:

JP2010188051A	2010-09-02
JP2004321810A	2004-11-18
JP2004535848A	2004-12-02
JPS56106648A	1981-08-25
JP2010188051A	2010-09-02

Other References: