Indian Journal of Science and Technology
DOI: 10.17485/ijst/2017/v10i13/103299
Year: 2017, Volume: 10, Issue: 13, Pages: 1-8
Original Article
G. Raja1*, B. K. Gnanavel2 , T. Ramesh3 and L. Mahesh Kumar1
1Department of Mechanical Engineering, St. Peter’s University, Chennai − 600054, Tamil Nadu, India; [email protected] 2Department of Mechanical Engineering, Saveetha Engineering College, Chennai – 602105, Tamil Nadu, India; 3Department of Mechanical Engineering, National Institute of Technology, Tiruchirapalli – 620015, Tamil Nadu, India;
*Author for correspondence
G. Raja
Department of Mechanical Engineering, St. Peter’s University, Chennai − 600054, Tamil Nadu, India; [email protected]
Objectives: This work investigates the mechanical behaviour of lead cable used in cardiac pacemaker and comparing with theoretical values of equilibrium equations. Methods/Analysis: A pacemaker is a medical device which uses electrical impulses to regulate the heartbeat. The lead inside the pacemaker cable fails due to various reasons. One such reason is lead fracture which occurs long after the implantation procedure. The pacemaker is considered as a multi-layered assembly with 1+6+12 helical wires and a straight cylindrical core has been chosen for analysing the mechanical properties which plays an important role in the failure of the lead cable. Any lead cable which is considered as rope has general equations of equilibrium. The mechanical property involves tr and force, strand twisting moment, strand axial strain and contact stress. The same mechanical properties are found by writing programs in MATLAB. Findings: The study of mechanical properties of lead cable used in cardiac pacemaker is as same as possible with that of the values checked with the equations of equilibrium and the variations are also less than 2 percentage. Novelty/ Improvements: With the change in orientation of helix angle which is always assumed to be constant, is made as 82.53˚/-75.62˚, 73.29˚/62.36˚ and 62.24˚/-71.02˚. This change in orientation has made the better comparison of the mechanical properties of the lead cable used in cardiac pacemaker.
Keywords: Contact Stress, Cable Mechanics, Friction, Strand
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