NASA NTRS · 19710000162
Miniature implantable instrument measures and transmits heart function data
Abstract
Heart diameter is derived from measured transit time of 2.25 MHz ultrasonic pulse between two piezoelectric crystals attached to diametrically opposite heart surfaces. Miniature instrument implanted in chest telemeters information to external receiver-converter. System permits continual dimensional data recording taken from awake animals during long-term experiments.
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Lee, R. D.. 1971-06-01. Miniature implantable instrument measures and transmits heart function data. https://ntrs.nasa.gov/citations/19710000162
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