Detection of temperature variations over regions of living tissue
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United States of America Patent
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-
May 4, 1982
Grant Date -
N/A
app pub date -
Nov 21, 1980
filing date -
Nov 21, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A first elastic film containing cholesteric liquid crystals and a second elastic protective film having different elasticities are attached to each other solely along the periphery of the two sheets. Differential air pressure applied across the dual film structure causes it to stretch and conform to the body tissues whose temperature variations are being studied. The liquid crystal containing film and the protective film stretch and adjust independently of one another, in response to differential pressure, to squeeze out any air in the space between the two sheets and to avoid puckering or other distortions. The protective film is in contact with the tissue being investigated and provides a barrier to protect the liquid crystals from contamination yet conveys the underlying temperature accurately to the liquid crystals.
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