Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Leg – Knee
Patent
1997-08-12
1999-05-04
Willse, David H.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Leg
Knee
623 39, A61F 264
Patent
active
058999434
ABSTRACT:
Paying attention to the mechanical play between the first and second support members for supporting opposite end portions of a knee axis and a brake block located between the support members, the present invention chiefly aims at removing the play in the direction of an axis of the knee axis in an effective and a reliable manner. In order to achieve this object, according to the present invention, a plurality of spacer members are inserted between each support member and the brake block such that the spacer members may slide on the mutual abutment surface. Each spacer member is of a ring type. The spacer members are fitted to and supported by the knee axis in a state that the spacer members are overlaid one upon another in the axial direction of the knee axis. In order to enhance the smooth sliding on the abutment surface, the spacer members are preferably made of resin material. In order to enhance the smoother sliding, at least one spacer member having the abutment surface is more preferably made of resin of low friction, such as oil-contained resin or phenol resin. The remaining spacer member contacting the resin of low friction may be made of such resin as polyacetal, polyamide and tetraethylene fluoride. Most preferably, one spacer member is made of oil-contained polyacetal resin which is especially excellent in low friction, and the remaining spacer contacting the first-mentioned spacer member is made of non-oil contained polyacetal resin.
REFERENCES:
patent: 1690194 (1928-11-01), Girton
patent: 1966574 (1934-07-01), Wenneborg
patent: 2450728 (1948-10-01), Havens
patent: 2533008 (1950-12-01), Hanson
patent: 2794987 (1957-06-01), Oliver
patent: 4152787 (1979-05-01), Meggyesy
patent: 4320747 (1982-03-01), Daniell
patent: 5044360 (1991-09-01), Janke
Furuichi Yasukazu
Nakatani Kazuo
Shiraishi Norio
Nabco Limited
Willse David H.
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