US 5,489,309 AGranted

Modular humeral component system

AssigneeSmith & Nephew Richards Inc.

InventorsJennifer Lackey, Steven J. Imbimbo, Robert Cofield

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Abstract

A modular humeral prosthesis that can be custom fitted to a particular patient by interchanging sizes of the various components by a surgeon interoperatively. The prosthesis features a humeral head having a hemispherically shaped outer surface for placement within the glenoid cavity of a human scapula, the head including on its undersurface a recessed center portion having a first cooperating connecting means. The body has a proximal end and a distal end, with the proximal end including an angled platform having a second cooperating connecting means for engagement with said first connecting means, and the distal end having a third cooperating connecting means. The body also includes a plurality of fins. A cylindrical primary stem has a proximal end and a distal end, the proximal end having a forth cooperating connecting means for engagement with said third connecting means, and the distal end having a fifth cooperating connecting means. A cylindrical secondary stem has a proximal end and a distal end, the proximal end having a sixth cooperating connecting means for engagement with said fifth connecting means, and the distal end having a tip for insertion within the medullary canal of a resected human humerus.

Claims31

Dependent claims

A modular humeral prosthesis kit apparatus that can be custom fitted to a particular patient by a surgeon interoperatively, comprising:

a) multiple humeral head portions, each having a hemispherically shaped outer surface for placement within the glenoid cavity of a human scapula, a planar undersurface and a socket that communicates with undersurface;
b) a plurality of modular body portions each having a proximal end, a distal end, a generally cylindrically shaped stem portion having a central longitudinal axis, and a male projecting portion that forms a taper-lock connection with the socket of a selected head portion;
c) each said proximal end including an angled platform having a diameter and at least one radially extending projection that connects between the platform and stem portion for restricting rotational movement of the prosthesis during use;
d) the generally cylindrically shaped portion extending from the platform to a position well away from the fin;
e) said distal end of the stem portion having a connecting means, the respective body portions being of variable lengths between the proximal and distal end;
f) wherein there are multiple cylindrical primary modular stem members, each having a proximal end and a distal end;
g) multiple cylindrical secondary modular stem members each having a proximal end and a distal end;
h) an end of each of said primary and secondary stem members having cooperating first and second connecting means for engagement with corresponding connecting means of a selected body portion or stem member, at least one of said distal ends having a tip for insertion within the medullary canal of a resected human humerus;
and
i) a selected number of components selected from said humeral head portions, body portions, primary stem portions, and secondary stem portions being affixable together end to end thereby forming a modular prosthesis that can be custom fitted to a particular patient by selectively interchanging different diameter sizes of the head portions, body portions, and stems to fit a prosthesis to the patient.

7 more elements

An implantable modular humeral prosthesis that can be custom fitted to a particular patient by a surgeon interoperatively, comprising:

a) a humeral head portion having a hemispherically shaped outer surface for placement within the glenoid cavity of a human scapula and an undersurface for engagement with a body portion, said head portion including on its undersurface a conically shaped socket that defines a first cooperating connecting means;
b) a cylindrically-shaped body portion that is of a generally uniform diameter said body portion having a proximal end and a distal end, said proximal end including a platform having a conically shaped projecting portion that defines a second cooperating connecting means for engagement with said first connecting means for forming a taper lock connection therewith;
c) reinforcement means extending between said cylindrically-shaped body portion and said angled platform, said reinforcement means including at least one radially extending projection for restricting rotational movement of the prosthesis during use;
d) a primary stem portion having a proximal end and a distal end, said proximal end having a fourth cooperating connecting means for engagement with said third connecting means, said distal end having a fifth cooperating connecting means;
e) a secondary stem portion having a proximal end and a distal end, said proximal end having a sixth cooperating connecting means for engagement with said fifth connecting means, said distal end having a tip for insertion within the medullary canal of a resected human humerus;
and
f) the said humeral head portion, body portion, primary stem portion, and secondary stem portion being coupled together thereby forming a modular prosthesis that can be custom fitted to a particular patient by interchanging sizes of the various selected humeral head, body portion, and stem portion components.

4 more elements

Dependencies are inferred from the claim text.