ADJUSTABLE LINK FOR PROSTHETIC LIMB
First Claim
Patent Images
1. An adjustable link interconnecting two members of a prosthetic limb, comprising a male part rigid with one of said members and a complementary female part rigid with the other of said members;
- said male part including a spherically convex base and a boss of substantially frustopyramidal configuration divergingly rising from said base, two pairs of opposite sides of said boss forming respective pairs of contact surfaces bisected by mutually orthogonal planes;
said female part comprising an annular socket surrounding said boss, said socket having a spherically concave ring surface complementary to and of the same radius of curvature as said base and in slidable engagement therewith; and
adjustable abutment means on said socket engaging said surfaces for retaining said parts in a selected angular position within predetermined swing ranges in said planes.
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Abstract
A link between members of a prosthetic limb, such as a connector between a knee joint and an artificial shank, has a frustopyramidal four-sided boss divergingly projecting from a spherically convex base which slidably engages a correspondingly concave annular socket surrounding the boss. Two pairs of setscrews, lodged 90* apart in the annular socket, bear upon the sides of the frustopyramidal boss to enable its adjustment, within a limited swing angle, in two mutually orthogonal planes.
83 Citations
4 Claims
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1. An adjustable link interconnecting two members of a prosthetic limb, comprising a male part rigid with one of said members and a complementary female part rigid with the other of said members;
- said male part including a spherically convex base and a boss of substantially frustopyramidal configuration divergingly rising from said base, two pairs of opposite sides of said boss forming respective pairs of contact surfaces bisected by mutually orthogonal planes;
said female part comprising an annular socket surrounding said boss, said socket having a spherically concave ring surface complementary to and of the same radius of curvature as said base and in slidable engagement therewith; and
adjustable abutment means on said socket engaging said surfaces for retaining said parts in a selected angular position within predetermined swing ranges in said planes.
- said male part including a spherically convex base and a boss of substantially frustopyramidal configuration divergingly rising from said base, two pairs of opposite sides of said boss forming respective pairs of contact surfaces bisected by mutually orthogonal planes;
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2. A link as defined in claim 1 wherein said frustopyramidal boss is four-sided.
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3. A link as defined in claim 1 wherein said abutment means comprises two pairs of setscrews extending perpendicularly to said sides of the frustopyramid.
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4. A link as defined in claim 3 wherein said sides have a slight concave curvature in the planes bisecting same.
Specification