Abstract The invention provides an improved prosthetic toe joint adapted for replacement of a human toe joint which includes at least one one-piece member for implantation into the bone of the joint. The implant has a concave articulating surface which articulates against another one-piece component having a mating convex surface or against a mating convex bone surface. This one part component is provided with a flexible hinge section at the junction of its stem and the enlarged head portions. The hinge section is formed from a section of the stem which extends laterally outwardly on both sides of the stem portion adjacent the junction with the head. The laterally enlarged section is provided with a longitudinal channel extending through its midsection to form a hinge. Each of the one-piece components is preferably molded of a flexible elastomeric, physiologically inert material, for example medical grade silicone rubber.
An improved prosthetic toe joint adapted for replacement of a human toe joint which includes at least one one-piece member for implantation into the bone of the joint, the implant having a stem and an enlarged head which is provided with a concave articulating surface for articulation against another one-piece component having a mating convex surface or against a mating convex bone surface, the one part component being provided with a flexible hinge section at the junction of its stem and the enlarged head portion, the hinge section being formed from a section of the stem which extends laterally outwardly on both sides of the stem portion adjacent the junction with the head, the laterally enlarged section being provided with a longitudinal channel extending through its midsection to form a hinge, said one-piece component being formed of a flexible elastomeric, physiologically inert material.
Claim 2
Dependent Claim
143 words
An improved prosthetic toe joint adapted for replacement of a human toe joint which includes at least one one-piece member for implantation into the bone of the joint, the implant having a stem and an enlarged head which is provided with a concave articulating surface for articulation against another one-piece component having a mating convex surface or against a mating convex bone surface, the one part component being provided with a flexible hinge section at the junction of its stem and the enlarged head portion, the hinge section being formed from a section of the stem which extends laterally outwardly on both sides of the stem portion adjacent the junction with the head, the laterally enlarged section being provided with a longitudinal channel extending through its midsection to form a hinge, said one-piece component being formed of a flexible elastomeric, physiologically inert material.
Claim 3
Dependent Claim
17 words
A prosthesis according to claim 1 wherein said one-piece component is formed of medical grade silicone elastomer.
Claim 4
Dependent Claim
34 words
A prosthesis according to claim 1 wherein one wall of said longitudinal channel is thickened near its midsection and the opposite wall is recessed to receive said thickened portion upon flexion of said hinge.
Claim 5
Dependent Claim
19 words
A prosthesis according to claim 1 wherein said articulating surface is capped with a layer of biologically compatible metal.