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Prosthesis with resorbable collar

a collar and prosthesis technology, applied in the field of orthopaedics, can solve the problems of stress shielding, bone resorption and bone loss, and the patient's weight can be considerable, and achieve the effect of accurate initial and final stem position, alleviating stress shielding and resultant bone loss

Inactive Publication Date: 2007-03-22
DEPUY PROD INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0030] Another technical advantage of the present invention is the ability to provide for an accurate initial and final stem position by utilizing the collar to position the stem against the resected portion of the bone. This is applicable to both cemented and uncemented stems, as well as to coated and uncoated stems, including those coated with a porous coating for bone ingrowth.
[0031] A further technical advantage of the present invention is the ability of the resorbed collar to alleviate stress shielding and resultant bone loss particularly to the medial calcar otherwise caused by a traditional metal collar.

Problems solved by technology

Collars are positioned on the resected end of the long bone and can potentially bear a considerable portion of the patient's weight.
Such load carrying of the collar can lead to stress shielding particularly at the proximal medial calcar portion of the resected long bone.
The stress shielding leads to bone resorption and bone loss.

Method used

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  • Prosthesis with resorbable collar
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Embodiment Construction

[0078] Embodiments of the present invention and the advantages thereof are best understood by referring to the following descriptions and drawings, wherein like numerals are used for like and corresponding parts of the drawings. According to the present invention and referring now to FIG. 1, an embodiment of the present invention is shown as prosthesis 10. The prosthesis 10 includes a stem 12. As shown in FIG. 1, the stem 12 is suitable for implantation at least partially within medullary canal 14 of long bone 16.

[0079] The prosthesis 10 further includes a collar 20 for positioning during surgery the prosthesis 10 within the long bone 16. The collar 20 is operably associated with the stem 12 and extends outwardly in the direction of arrow 22 from the stem 12. At least a portion of the collar 20 includes a resorbable material. Preferably and as is shown in FIG. 1, the collar 20 includes a collar face 24 which is positioned against the resected surface 26 of the long bone 16. The col...

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Abstract

An articulating hemiarthroplasty prosthesis (10) for use in arthroplasty is provided. The prosthesis includes a stem (12) for implantation at least partially within the medullary canal (14) of a long bone (16) and a collar (20). The collar (20) is operably associated with the stem (12) and extends outwardly therefrom. At least a portion of the collar (20) includes a resorbable material. The prosthesis includes a head (30) and a cup (46) for engagement with the head (30).

Description

CROSS REFERENCE TO U.S. PROVISIONAL PATENT APPLICATION [0001] This Application is a Utility Application based upon U.S. Provisional Patent Application Ser. No. 60 / 302,113 filed Jun. 30, 2001, entitled PROSTHESIS WITH RESORBABLE COLLAR.TECHNICAL FIELD OF THE INVENTION [0002] The present invention relates generally to the field of orthopaedics, and more particularly, to an implant for use in arthroplasty. BACKGROUND OF THE INVENTION [0003] This invention relates to implantable articles and methods for manufacturing such articles. More particularly, the invention relates to bone prosthesis and process for manufacturing the same. [0004] There are known to exist many designs for and methods for manufacturing implantable articles, such as bone prostheses. Such bone prostheses include components of artificial joints, such as elbows, hips, knees and shoulders. An important consideration in the design and manufacture of virtually any implantable bone prosthesis is that the bone prosthesis ha...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61F2/36A61F2/28A61B17/56A61F2/00A61F2/02A61F2/30A61F2/32A61F2/34A61F2/40A61F2/46A61L27/58
CPCA61B17/8808A61L27/58A61F2/30728A61F2/30767A61F2/32A61F2/34A61F2/36A61F2/3662A61F2/367A61F2/3676A61F2/40A61F2/4059A61F2/4607A61F2002/30062A61F2002/30065A61F2002/30112A61F2002/30123A61F2002/30131A61F2002/30158A61F2002/30324A61F2002/30332A61F2002/30341A61F2002/3038A61F2002/30383A61F2002/30487A61F2002/30504A61F2002/30729A61F2002/30772A61F2002/308A61F2002/3082A61F2002/30822A61F2002/30827A61F2002/3085A61F2002/3611A61F2002/3625A61F2002/365A61F2002/3652A61F2002/368A61F2002/4018A61F2002/4051A61F2002/4631A61F2210/0004A61F2210/0071A61F2220/0025A61F2220/0033A61F2230/0004A61F2230/0006A61F2230/0013A61F2230/0026A61F2250/0036A61F2310/00017A61F2310/00023A61F2310/00029A61F2310/00179A61F2310/00383A61F2310/00952A61F2/30724A61F2002/30331A61F2002/30339A61F2002/305
Inventor WEISSMAN, MARC G.VANMETER, J.B.CAMINO, THOMAS S.THORNHILL, THOMASSCHMALZRIED, THOMASBERRY, DANIELCALLAGHAN, JOHNFISHER, DAVID
Owner DEPUY PROD INC
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