Liquid crystal infiltration sensing system

Details Liquid crystal infiltration sensing system Liquid crystal infiltration sensing system

1980-04-07

1983-04-05

Howell, Kyle L.

Surgery

Truss

Pad

428 1, 374 4, 252962, 2522991, A61B 610

Patent

active

043788084

ABSTRACT:
A patch of temperature-sensitive liquid crystal material adheres to a patient's skin to serve as an indicator of infiltration during intravenous (or intraarterial, intra-lymphatic vessel, etc.) insertion procedures. The material is selected so as to have a constant color over a temperature range which spans the normal skin temperature range. The patch is placed immediately downstream of the insertion point and preferably has a straight forward edge to permit rapid color change over a broad section of the patch in response to infiltration. The patch may include a downstream extension, remote from the likely infiltration region, which experiences infiltration-responsive color change considerably later than the forward edge, thereby providing a color contrast to facilitate visual detection. Alternatively, a portion of the patch is permanently colored to have the same color as the patch at normal skin temperatures; the permanently colored portion therefore provides color contrast when the patch color changes due to infiltration.

REFERENCES:
patent: 3469448 (1969-09-01), Swengel, Sr.
patent: 3661142 (1972-05-01), Flam
patent: 3951133 (1976-04-01), Reese
patent: 3957202 (1976-05-01), Hornsby, Jr.
patent: 3998210 (1976-12-01), Nosari
patent: 4015591 (1977-04-01), Suzuki et al.
patent: 4030482 (1977-06-01), Navato
patent: 4064872 (1977-12-01), Caplan
patent: 4079529 (1978-03-01), Jennen et al.

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