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Method of Improving Taper Connection Endurance

IP.com Disclosure Number: IPCOM000238492D
Publication Date: 2014-Aug-28
Document File: 3 page(s) / 103K

Publishing Venue

The IP.com Prior Art Database

Abstract

Fatigue induced crack propagation may occur in taper connections between modular components of some orthopaedic implants, such as between the head and stem of a total hip replacement prosthesis. A manufacturing process commonly known as laser shock peening may be applied to each component taper surface to add a subsurface zone of compressive, residual stresses. This may help prevent the propagation of surface cracks that can form due to fretting at the junction of the taper connection during repetitive loading. This process may also be applied to various zones within a component where microcracking is suspected to initiate. For example, a male taper may include a threaded hole along the center axis of the taper. The process may be applied inside the threaded hole to create a deep layer of compressive stress close to the inner threads in the taper region to keep internal microcracks from migrating towards the taper surface. This may effectively treat internal geometries that are difficult or impossible to treat with more conventional processes on the outside, taper surface.

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Method of Improving Taper Connection Endurance

    Fatigue induced crack propagation may occur in taper connections between modular components of some orthopaedic implants, such as between the head and stem of a total hip replacement prosthesis. A manufacturing process commonly known as laser shock peening may be applied to each component taper surface to add a subsurface zone of compressive, residual stresses. This may help prevent the propagation of surface cracks that can form due to fretting at the junction of the taper connection during repetitive loading.

    This process may also be applied to various zones within a component where microcracking is suspected to initiate. For example, a male taper may include a threaded hole along the center axis of the taper. The process may be applied inside the threaded hole to create a deep layer of compressive stress close to the inner threads in the taper region to keep internal microcracks from migrating towards the taper surface. This may effectively treat internal geometries that are difficult or impossible to treat with more conventional processes on the outside, taper surface.


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