Blood vessel locating needle assembly with thermochromic indicator
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United States of America Patent
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-
Nov 20, 1990
Grant Date -
N/A
app pub date -
Jul 7, 1989
filing date -
Jul 7, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The penetration of a vein or the like by a fluid collecting or dispensing needle is rapidly confirmed by the transfer of thermal energy from fluid entering the needle bore upon such penetration to a temperature responsive medium in intimate contact with the exterior of the needle. The temperature responsive medium may comprise thermochromic liquid crystals which signal a change in temperature from ambient temperature by changing color.
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