Device for angularly coupling prosthetic components
An angularly adjustable coupler is provided having first and second ends that are in an angularly adjustable mating engagement. The first end has a longitudinal axis and a base with an optionally concave and serrated surface, and can comprise a collared clamp for connecting to a pylon. The second end has a longitudinal axis and a base with an optionally convex and serrated surface, and can comprise a receiver for connecting to a pyramidal adapter. The concave portion of the first end and the convex portion of the second end are complementary to each other. A connector is provided to connect the first and second ends in a selected angular alignment about a fixed axis of rotation. The range of angular alignment of the first and second components spans approximately 50 degrees about the fixed axis of rotation.
1. An angled coupler comprising:
A. a fastener having a head and a shaft;
B. a first end having:
i. a first end longitudinal axis;
ii. a collar with a clamp for receiving and securing an upper prosthetic component to said first end; and
iii. a first end base connected to said collar, said first end base having a first end base interior surface and a first end base exterior surface, said first end base exterior surface being concave and having serrations, said first end further having a first end hole through said first end base in a direction generally parallel to said first end longitudinal axis and being open to said first end base interior surface, whereby said collar and said first end base interior surface define a first end interior region wherein said head of said fastener engages said first end base interior surface and is accessible only through said first end interior region, and said shaft passes through said first end hole and said first end base exterior surface;
C. a second end having:
i. a second end longitudinal axis;
ii. a second end base with a second end base interior surface and a second base end exterior surface, said second end base exterior surface being convex and having serrations adapted to be matingly connected to said first end base exterior surface;
iii. a slot extending through said second end base in a plane generally parallel to said second end longitudinal axis and longitudinally extending along said convex second base exterior surface and being open to said second end base interior surface and said second end base exterior surface thereby allowing said shaft of said fastener to pass through said slot;
iv. a second end hole through said second end base in a direction generally perpendicular to said second end longitudinal axis to create a single pivot axis between said first end and said second end, and
v. a receiver having set screws, said receiver connected to said second end base and defining a cavity that opens in a direction opposed to said second end base interior surface, said cavity selectably receiving said set screws for releasably retaining a lower prosthetic component; and
D. a pin rotatably received in said second end hole being operable about said single pivot axis and having a pin hole that is generally perpendicular to said single pivot axis, said shaft of wherein said fastener is inserted through said first end hole and said slot and into said pin hole in order to adjustably rotate said pin to move said shaft to a desired longitudinal position within said slot and matingly engage the serrations of said first end base and said second end base to rigidly connect said first end and said second end such that said first end longitudinal axis is in a selected angular alignment with respect to said second end longitudinal axis and said first end is angularly adjustable with respect to said second end about said single pivot axis.
2. The angled coupler of claim 1 wherein said slot limits a range of said selected angular alignment about said single pivot axis.
3. The angled coupler of claim 2 wherein said range of said selected angular alignment about said single pivot axis is approximately 50 degrees.