Set of humeral components for total shoulder prosthesis

a technology of humeral components and total shoulder prosthesis, which is applied in the direction of shoulder joints, joint implants, joint implants, etc., can solve the problems of limit this movement and damage to the prosthesis, and achieve the effect of being easy to adapt to the patien

Active Publication Date: 2007-01-02
TORNIER SA SAINT ISMIER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]Thanks to the invention, the concave articular surface of the different humeral components may be so positioned, with respect to the outer surface of the metaphyseal part, that the interferences of the metaphyseal part with the pillar of the scapula are minimized, and even eliminated.
[0013]The invention also relates to a total shoulder prosthesis which comprises a humeral component selected from a set of components as described hereinabove. Such a prosthesis is more easily adaptable to the patient's morphology.
[0014]According to an advantageous aspect of the invention, such a prosthesis comprises, in addition, a glenoid component which forms a convex surface of articulation centered on an axis of symmetry which is not perpendicular to a rear face of this component intended to come into abutment against the glenoid cavity. This aspect of the invention makes it possible to “compensate” for a defect in parallelism between a resectioned surface of the glenoid cavity against which the glenoid component abuts and an axis of the patient's spinal column.

Problems solved by technology

With these known prostheses, it may happen, during a movement of adduction, that a portion of a metaphyseal part of the humeral component engages the pillar of the scapula, which limits this movement and may prove painful, and even cause damage to the prosthesis.

Method used

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Examples

Experimental program
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Embodiment Construction

[0028]Referring now to the drawings, the prosthesis P shown in FIG. 1 comprises a glenoid component 10 which is fixed to the glenoid cavity G by any appropriate means, for example in accordance with the technical teaching of FR-A-2 836 039, and which defines a convex articular surface S1 substantially in the form of a demi-sphere.

[0029]The prosthesis P also comprises a humeral component 20 formed by an anchoring stem 21 and a metaphyseal part 22. The stem 21 is globally rectilinear and adapted to be introduced in the medullary canal M of the humerus H, while the metaphyseal part 22 projects beyond this canal and defines a concave articular surface S2 in the form of a portion of sphere.

[0030]In FIGS. 1, 1A and 2, the glenoid cavity 4 and the component 10 are shown in side view, while the humerus H and component 20 are shown in longitudinal section.

[0031]The surfaces S1 and S2 are adapted to constitute a sliding articulation and have substantially equal radii.

[0032]The external shape ...

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Abstract

A set of humeral components for a total shoulder prosthesis, wherein each component is formed by an anchoring stem and a metaphyseal part which defines a concave surface of articulation in the form of a portion of a sphere. The offset between an axis of symmetry of this surface and a central axis of the metaphyseal part varies between the different components of the set. This makes it possible to limit or to avoid, by a reasoned choice of the humeral component used, an interference with the pillar of the scapula during a movement of adduction.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of U.S. provisional application for patent Ser. No. 60 / 579,259, filed Jun. 15, 2004, and also claims priority of French application for patent 04 06470, filed Jun. 15, 2004.BACKGROUND OF THE INVENTION.[0002]The present invention relates to a set of humeral components for a total shoulder prosthesis, as well as to a prosthesis and to a method for installing such a prosthesis.DESCRIPTION OF THE RELATED ART[0003]In the domain of total shoulder prostheses, it is known, for example from U.S. Pat. No. 3 978 528, from EP-A-0 299 899 or from FR-A-2 836 039, to form a prosthesis in which a convex articular surface is secured to a glenoid cavity, while a concave articular surface is secured to a humerus, the cooperation of these surfaces making it possible to recreate a joint of the shoulder. With these known prostheses, it may happen, during a movement of adduction, that a portion of a metaphyseal part of the hu...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): A61F2/40
InventorTORNIER, ALAINSIRVEAUX, FRANCOISWALCH, GILLESMOLE, DANIELLEVIGNE, CHRISTOPHEBOILEAU, PASCALFAVARD, LUC
OwnerTORNIER SA SAINT ISMIER