Orthopaedic implant and fixation system

Inventors

Koenen, Jacob • Daamen, Edwin Norbertus Antonius Maria • Hunik, Jan • van TIENEN, Tony

Assignees

Atro Medical Bv

Abstract

A prosthesis assembly (100) for orthopaedic implantation comprises a prosthesis body (110) and an attachment portion (112) coupled to the prosthesis body (110) for attaching the prosthesis assembly (100) to a bone by way of a bone anchor (120) or other fixating means. The attachment portion (112) comprises an opening (130) having a receiving portion (132) with a first cross-sectional transverse width and a retaining portion (134) extending from the receiving portion (132), the retaining portion (134) having a second cross-sectional transverse width, which is less than the first cross-sectional transverse width. A system comprising the prosthesis assembly (100) includes a bone anchor (120) having a fastening member (124) for engaging the opening (130) and a stem (122) for securing to the bone.

Core Innovation

The invention relates to a prosthesis assembly for orthopaedic implantation that includes a prosthesis body having a wedge-like shape comprising an anterior-facing end and a posterior-facing end, and at least one attachment portion coupled to the prosthesis body. The attachment portion includes an opening with a receiving portion and a retaining portion, where the retaining portion has a second cross-sectional transverse width that is less than a first cross-sectional transverse width of the receiving portion. The receiving portion and retaining portion extend relative to a bone-engaging lower face of the attachment portion and define an opening geometry for engaging a fastening member of a bone anchor.

The opening is oriented such that the receiving portion is positioned distal to the retaining portion, enabling engagement with a fastening member of a bone anchor through the opening. The attachment portion is configured for engagement with the bone-anchor fastening member, and the wedge-like prosthesis geometry and opening orientation enable a fastening engagement in which the head passes the receiving portion but is latched by the retaining portion. The attachment portion can be configured for snap-fit engagement with the bone-anchor fastening member through the opening.

The disclosed prosthesis body is a knee meniscus replacement, and the attachment portion can include an optional recess or stepped bore to accommodate a fastening head. The opening can have various shapes, including tapered or flared openings and keyhole-shaped, L-shaped, curved, and multi-retaining configurations, with orientation that positions the distal receiving portion relative to the retaining portion. The disclosed system allows replacement performed without disturbing the bone anchor by releasing via alignment with the receiving portion.

Claims Coverage

The independent claim defines a knee meniscus replacement prosthesis assembly with a wedge-like prosthesis body and an attachment portion that has an opening including a distal receiving portion and a narrower retaining portion for engagement and snap-fit with a bone-anchor fastening member. The coverage includes 1 independent claim, with multiple dependent claims refining opening geometry, bore type, interface surfaces, snap-fit configuration, and the bone-anchor/fastening-member profile.

Overall claim coverage centers on a wedge-like knee meniscus replacement prosthesis with an attachment portion defining an opening that includes a wider distal receiving portion and a narrower retaining portion, oriented with the receiving portion distal to the retaining portion for engagement of a bone-anchor fastening member through the opening, optionally configured for snap-fit engagement.

Stated Advantages

Documented Applications