Glenoid anchor for a shoulder joint prosthesis

a technology for glenoid anchors and shoulder joints, applied in the field of improved glenoid anchors for prostheses, can solve the problems of serious slackening and/or separation, and the anchor elements do not facilitate multi-functional use, and achieve the effect of easy removal

Pending Publication Date: 2022-05-19
LIMA CORPORATE SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution provides a stable and secure fixation of the prosthesis, enabling easy conversion between anatomical and reverse configurations during surgical implantation, reducing the risk of separation and facilitating multi-functional use while promoting bone integration and secure mechanical interference.

Problems solved by technology

Although advantageous in many respects and substantially fulfilling their purpose, all these known solutions have a common drawback consisting in the fact they are not always able to ensure correct and durable fixing of the anchor element inside the glenoid cavity, with obvious serious risks of slackening and / or separation.
In particular, the presence of the flange formed as one piece with the pin portion of the anchor element is a limitation for the surgeon who must correctly form in the glenoid cavity the seat for the pin portion, making sure, however, to position it so that the flange may adhere with a form-fit to the surface of the glenoid cavity.
Moreover, the form of these anchor elements does not facilitate multi-functional use thereof, in the sense that it does not allow them to be used equally well for an anatomical prosthesis and for a reverse prosthesis.
Although advantageous from various points of view and substantially fulfilling its purpose, this solution also has a drawback in that the flange has, affixed thereon, a bearing of synthetic material, normally polyethylene, which must in any case be removed during conversion of the prosthesis, so that it may be replaced by another component with a convex form.
Moreover, in the case of wear of the bearing of synthetic material there will be metal-to-metal contact between the humeral head and the glenoid flange.

Method used

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  • Glenoid anchor for a shoulder joint prosthesis
  • Glenoid anchor for a shoulder joint prosthesis
  • Glenoid anchor for a shoulder joint prosthesis

Examples

Experimental program
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Embodiment Construction

[0046]With reference to these figures, and in particular to the example shown in FIG. 2, 1 denotes overall and in schematic form an improved anchor element designed in accordance with the present invention for stably and securely fixing a prosthesis for the shoulder joint to the glenoid cavity of the shoulder blade.

[0047]In the description below reference will be made to this anchor element 1 using the simpler term “glenoid anchor”.

[0048]Advantageously the anchor 1 is a component which allows the conversion of a shoulder joint prosthesis from an anatomical prosthesis to a reverse prosthesis. This anchor 1 is intended to cooperate with another, structurally independent, prosthesis component 9, which can be snap-engaged by means of a mechanical interference fit with the anchor 1 and which will be described in greater detail below.

[0049]The anchor 1 is intended to be surgically implanted in the glenoid cavity of the shoulder blade and has the function of supporting the loads and of bei...

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Abstract

A glenoid anchor for a shoulder joint prosthesis, fixed to a glenoid cavity of a shoulder blade. The glenoid anchor consists only of a structurally independent pin, with an internally hollow conical sleeve, which has a tapered distal end configured for being directly fixed to the glenoid cavity and an open proximal end configured for being removably attached to a prosthesis component. The prosthesis component is a lug of either one of an anatomical prosthesis or a reverse prosthesis. The glenoid anchor is configured for removal of said lug in order to convert the anatomical prosthesis to the reverse prosthesis or vice-versa, while keeping the structurally independent pin inside the glenoid cavity. An outer surface of the sleeve of said pin has a trabecular structure for favouring osteogenesis and bone integration. The pin further comprises an annular recess formed inside an internal cavity of the pin, for receiving by means of mechanical interference an edge of the lug of the prosthesis component, substantially locking the lug inside the internal cavity.

Description

[0001]This application claims the benefit under 35 U.S.C. § 120 as a Divisional of application Ser. No. 15 / 558,543, filed Sep. 14, 2017, which is a US national stage application filed under 35 U.S.C. § 371 based upon International Patent Application PCT / IB2016 / 051574, filed 21 Mar. 2016, which claims the benefit of Italian application MI2015A000417, filed 19 Mar. 2015, the entire contents of which is hereby incorporated by reference for all purposes as if fully set forth herein. The applicants hereby rescind any disclaimer of claim scope in the parent applications or the prosecution history thereof and advise the USPTO that the claims in this application may be broader than any claim in the parent applications.DESCRIPTIONField of Application[0002]The present invention relates to an improved glenoid anchor for a prosthesis of the shoulder joint, in particular a hybrid prosthesis, namely a convertible prosthesis.[0003]The invention relates more specifically, but not exclusively, to an...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): A61F2/30A61F2/40
CPCA61F2/30749A61F2/4081A61F2002/30332A61F2002/30349A61F2002/30336A61F2002/305A61F2002/30507A61F2002/30878A61F2002/4085A61F2002/30367A61F2310/00023
InventorPRESSACCO, MICHELEFATTORI, ANDREAVIDONI, GABRIELECONNOR, PATRICK MICHAELIZQUIERDO, ROLANDOPOON, PETER CHANNELSCALISE, JASON J.
OwnerLIMA CORPORATE SPA