The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 05, 1983
Filed:
Apr. 07, 1980
Joseph Lichtenstein, Colonia, NJ (US);
Whitman Medical Corporation, Clark, NJ (US);
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.