UNIAXIAL ARTIFICIAL KNEE JOINT WITH A LOCK Russian patent published in 2005 - IPC

FIELD: medical engineering.

SUBSTANCE: device has femoral part having modular mount of femoral prosthesis bucket and crural part having crural fastening members mounted on rotation axis and locking mechanism having spring-loaded latch and socket having cylindrical surfaces. A socket is an extended member one end of which is mounted on an additional axle arranged in parallel to the rotation axis and fixed in the femoral part. The other end has cylindrical surface is spring-loaded towards locking side. Compression spring is mounted in the femoral part. Radii of the cylindrical latch surface R₁ and of the socket R₂ satisfy the following conditions R₁ = 0.3-0.5 R; R₂ = 0.7-0.9 R, where R is the distance from cylindrical surfaces contact line to latch rotation axis. Plane passing through the cylindrical surfaces contact line and latch rotation axis makes angle of α with plane being in perpendicular relation to cylindrical surfaces and passing through their contact line, The angle satisfies condition of 0≤α<0.4ϕ, where ϕ is the friction angle between the contacting surfaces.

EFFECT: enhanced effectiveness in locking a joint without backlash regardless of friction wear of its surfaces.

5 cl, 5 dwg