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A Microcalorimeter for Nondestructive Analysis of Pacemakers and Pacemaker Batteries

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4 Author(s)

A microcalorimeter has been built by the authors and used to measure internal losses in primary pacemaker batteries. Power dissipation of 10-50 ¿W has been measured in new pacemaker batteries, much of which is traceable to innocuous exotherm from continuing curing of plastic materials in the battery. True internal shorts have produced 1000-2000 ¿W of heat. Present noise level is about 3 ¿W. A noise level of under 1 ¿W should be achievable. Such a microcalorimeter should prove invaluable for nondestructive early identification of parasitic power losses, both in batteries and in completed pacemakers.

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IEEE Transactions on Biomedical Engineering  (Volume:BME-26 ,  Issue: 5 )