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Publication Number
US-10076417-B2
Publication Date
2018-09-18
Expiration Date
Abstract
A joint prosthesis assembly, includes a joint prosthesis body (1) made of a first biocompatible non-resorbable material and an anchoring element (2-5) made of a second biocompatible non-resorbable material. The anchoring element (2-5) is arranged to allow rotation of an end portion of the joint prosthesis body (1) with respect to the anchoring element (2-5) when in situ.
Core Innovation
The invention relates to an improved joint prosthesis assembly using a joint prosthesis body made of a first biocompatible non-resorbable material, the joint prosthesis body including an end portion with a bore. An anchoring element includes a plug made of a second biocompatible non-resorbable material and a cable attached to the plug, the cable being made of a third biocompatible non-resorbable material. The plug is disposed within and extending through the bore of the end portion and is arranged to allow free rotation of the end portion of the joint prosthesis body with respect to the anchoring element when in situ.
The plug is configured to secure within a bore in a bone such that the plug is partially disposed within the bone. To achieve this, the plug comprises a thread, texture or bone ingrowth enhancing layer configured to secure the plug within a bore in a bone, providing an anchoring that is compatible with a non-resorbable fixation concept. The arrangement is directed to enabling relative rotation and reducing constraints associated with rigid fixation approaches.
In the described assembly, fixation is presented as non-rigid, including plug-and-cable fixation as well as alternative plug fixation embodiments such as a plug/screw/cord configuration. The plug can have a textured plug surface and can incorporate a bone ingrowth enhancing layer to secure the plug in bone and reduce tunnel widening, with examples including hydroxy-apatite, tri-calcium phosphate, and metal granules.
Claims Coverage
The independent claim coverage centers on 3 inventive features: a non-resorbable prosthesis body with an end portion having a bore, a non-resorbable anchoring plug with an attached non-resorbable cable arranged through the bore to permit free rotation in situ, and plug surface/thread/bone-ingrowth features configured to secure the plug in bone while being partially disposed within the bone.
Non-resorbable joint prosthesis body with end bore
A joint prosthesis assembly with a joint prosthesis body made of a first biocompatible non-resorbable material, the joint prosthesis body comprising an end portion having a bore.
Rotational anchoring through the end bore using non-resorbable plug and cable
An anchoring element comprising a plug made of a second biocompatible non-resorbable material, and a cable attached to the plug, the cable being made of a third biocompatible non-resorbable material, wherein the plug is disposed within and extending through the bore of the end portion and is arranged to allow free rotation of the end portion of the joint prosthesis body with respect to the anchoring element when in situ.
Securing plug within a bone bore using thread, texture, or bone ingrowth enhancing layer
The plug comprises a thread, texture or bone ingrowth enhancing layer configured to secure the plug within a bore in a bone such that the plug is partially disposed within the bone.
The claim coverage focuses on a non-resorbable joint prosthesis assembly with plug-and-cable anchoring through an end bore, together with plug features that secure the plug in bone while permitting free rotation of the prosthesis body end portion with respect to the anchoring element.
Stated Advantages
Non-rigid fixation that reduces forces and improves durability.
Reduces tunnel widening by securing the plug in bone using a bone ingrowth enhancing layer.
Allows relative rotation/free rotation of the prosthesis body end portion with respect to the anchoring element when in situ.
Ease of implantation is stated.
Documented Applications
Knee joint meniscus prosthesis assembly, including a meniscus prosthesis body arranged relative to a tibial plateau.
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