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:
Jan. 05, 1988
Filed:
Mar. 31, 1986
Applicant:
Inventors:
James J Perrault, Brooklyn Center, MN (US);
George Jordan, Fairfield, CT (US);
Assignee:
Medtronic, Inc., Minneapolis, MN (US);
Primary Examiner:
Int. Cl.
CPC ...
A61N / ;
U.S. Cl.
CPC ...
604 20 ; 128639 ; 128660 ; 128803 ; 604111 ; 604404 ;
Abstract
A visual (as opposed to mechanical or electronic) method for detecting the state of dehydration (or hydration) of a biomedical hydrogel is disclosed. The method contemplates incorporating a pH sensitive indicator into the hydrogel as it is prepared and applying the hydrogel to the skin-contacting surface of a biomedical device such as an electrode. Shortly before the biomedical device is to be used, the color of the hydrogel on the device is visually compared with its freshly-prepared color to determine the approximate state of dehydration of the gel.