Blood vessel locating needle assembly with thermochromic indicat

Details Blood vessel locating needle assembly with thermochromic indicat Blood vessel locating needle assembly with thermochromic indicat

1989-07-07

1990-11-20

Yasko, John D.

Surgery

Truss

Pad

604116, 604900, 128771, 374147, A61B 500

Patent

active

049710680

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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