Venipuncture method and composition useful therein

Details Venipuncture method and composition useful therein Venipuncture method and composition useful therein

A - Human Necessities

61

M

31/105, 128/2, 1

A61M 1/00 (2006.01) A61B 5/00 (2006.01) A61M 5/32 (2006.01) A61M 5/42 (2006.01) C09K 19/60 (2006.01) G01K 11/16 (2006.01)

Patent

CA 1105793

ABSTRACT OF THE DISCLOSURE A method of effecting venipuncture in the human body includes the steps of cooling the skin over a venous area of the body by applying a cold pack thereto and providing on the cooled skin in heat exchange relation thereto, a layer of an enantio- tropic cholesteric liquid crystalline phase material exhibiting a mesophase color change at a temperature reached by the skin due to venous blood flow, warming the cooled skin by venous blood blow in such area thereby to produce a mesophase color change in the material delineating a vein therebeneath, and directing an instrument for venipuncture to a site in such area indicated by the delineation to constitute the location of a vein. A composition of matter having thermal color responsive characteristics and adapted for exhibiting improved color con- trast includes an enantiotropic cholesteric liquid crystalline phase material, and at least two oil-soluble dyes dissolved in the material in a total dye concentration of 0.01-1% by weight or the composition, each of the dyes reflecting light of a dif- ferent wave length in the range of 400 to 700 nanometers, and said dyes together absorbing light of substantially all wave lengths within said range.

270755

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