Modular humeral prosthesis

Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone

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623 22, 623 23, A61F 240

Patent

active

049196707

ABSTRACT:
A modular humeral prosthetic device comprising a humeral stem having a substantially cylindrical distal end for insertion within the medullary canal of a resected human humerus; the stem transforming proximally from the distal end into a widened proximal end being tapered from anterior to posterior aspect; the proximal end having a proximal end surface which is angled relative to the axis of the distal end; a collar extending from the proximal end surface for preventing the stem from subsiding within the medullary canal; a tapered cylindrical mounting lock mechanism disposed on the proximal end surface, the axis of the tapered cylinder being substantially coincident with the central axis of the proximal end surface; a head mechanism having a substantially spherically shaped outer surface for engagement within the glenoid cavity of a human scapula, the outer spherical surface of the head mechanism being less than half the surface of a complete sphere; the head mechanism including a complementary tapered aperture for reversibly receiving the cylindrical lock mechanism in a rigid mechanical coupling engagement; the theoretical center of the spherically shaped head mechanism being disposed at or below the collar.

REFERENCES:
patent: 4004300 (1977-01-01), English
patent: 4406023 (1983-09-01), Harris
patent: 4430761 (1984-02-01), Niederer et al.
patent: 4865605 (1989-09-01), Dines et al.
Amstutz, H. C., "The Trapezoidal-28.TM. Total Hip Replacement," Zimmer (Catalog), p. D11, Mar. 1975.

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