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research-article

Soft impact in a biomechanical system with a shape memory element

[+] Author and Article Information
Rafal Rusinek

Department of Applied Mechanics Lublin University of Technology Nadbystrzycka 36, 20-618 Lublin, Poland
r.rusinek@polub.pl

Marcin Szymanski

Department of Otolaryngology Head and Neck Surgery Medical University of Lublin Jaczewskiego 8, 20-090 Lublin, Poland
marcinszym@poczta.onet.pl

Jerzy Warminski

Department of Applied Mechanics Lublin University of Technology Nadbystrzycka 36, 20-618 Lublin, Poland
j.warminski@polub.pl

1Corresponding author.

ASME doi:10.1115/1.4036614 History: Received November 30, 2016; Revised April 13, 2017

Abstract

An analysis of the shape memory prosthesis of a middle ear is presented in the paper. A shape memory prosthesis enables adjusting its length to individual patient’s needs but sometimes the prosthesis can not be fixed properly to the stapes. In this case an impact phenomenon between the prosthesis and the stapes can be meaningful. Therefore, a reconstructed middle ear is modelled as a two degree of freedom system with a nonlinear shape memory element and soft impact to explain its behaviour when the prosthesis is not placed or fixed properly. The properties of the shape memory prosthesis, in the form of helical spring, are described here by a polynomial function. The system demonstrates advisable periodic and undesirable aperiodic and irregular behaviour depending on excitation amplitude, frequency and a prosthesis length. The prosthesis length can change causing a modification of a distance between the prosthesis and the stapes. The results of the study give an answer how the prosthesis length, which produces the ossicular chain tension, influences system dynamics and what it means in medical practice.

Copyright (c) 2017 by ASME
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