Cholesteric liquid crystalline phase material-dye composition an

Details Cholesteric liquid crystalline phase material-dye composition an Cholesteric liquid crystalline phase material-dye composition an

1976-02-17

1977-04-05

Kamm, William E.

Surgery

Truss

Perineal

128 2H, 23230LC, 73356, 252408, A61B 1000

Patent

active

040155919

ABSTRACT:
A composition of matter having thermal color responsive characteristics and adapted for exhibiting improved color contrast 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 of the composition, each of the dyes reflecting light of a different wave length in the range of 400 to 700 nanometers, and said dyes together absorbing light of substantially all wave lengths within said range. A method of effecting venapuncture in the human body includes the steps of cooling the skin over a venous area, applying directly on the skin a layer of the composition about 100 to 300 microns thick, allowing the skin over the venous area to rewarm due to venous blood flow, until the said material exhibits a mesophase color change to thereby delineate a vein therebeneath, and directing an instrument for venapuncture to a site in the said area indicated by the delineation to constitute the location of a vein.

REFERENCES:
patent: 2544659 (1951-03-01), Dreyer
patent: 2746264 (1956-05-01), Keyes
patent: 3433216 (1969-03-01), Mattson
patent: 3533399 (1970-10-01), Goldberg et al.
patent: 3576761 (1971-04-01), Davis
patent: 3765243 (1973-10-01), Pickett et al.
patent: 3766061 (1973-10-01), Mahler et al.
patent: 3782365 (1974-01-01), Pinna
patent: 3920574 (1975-11-01), Brown, Jr. et al.

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