Evonik Operations Gmbh

Suneel Bandi

Andreas Pawlik

Andreas Karau

Marc Knebel

Mahrokh Dadsetan

Balaji Prabhu

Kenneth Ross

Harsh Patel

Andrew Wood

The present invention comprises a polymer and/or polymer composite based sleeve to be fitted between an extended body, such the neck, trunnion, and/or stem of a hip implant, and a receiving body, such as a femoral head in a hip implant, that reduces wear, decreases toxic material from wear debris, enhances the mechanical connection of the extension and receiving body, reduces or eliminates impingement with receiving body, delocalize stress concentrations, and may also serve as a modifying junction between an extension and receiving body of unmatched size. The polymeric based sleeve presently disclosed comprises an inert and/or biologically favorable material which may be used in its virgin form or contain biocompatible additives. In order to best match patient and implant requirements, modifications may be made in the length, thickness, composition, as well as the presence of a taper, or lack thereof, in order to be compatible with existing devices.

Polymer sleeve for inhibiting stem wear and improving taper-lock in modular and non-modular orthopedic implants and the fabrication and processing thereof

The present invention relates to a thermoplastic composition that provides improved thermal aging stability. The thermoplastic composition includes a polyamide resin, glass fibers, tin(II) oxalate, and a functional additive. It has been found that a combination of a polyamide resin with tin(II) oxalate and a functional additive produces a superior product demonstrating greater thermal stability than the polyamide resin alone.

Stabilizer for polyamides

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West Lafayette, IN, United States of America

Suneel Bandi