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:
Mar. 30, 1982
Filed:
Jun. 29, 1979
David B Francis, Mt. Kisco, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A patient's own heart is used as a voltage source for measurement of EKG electrode impedance. The amplitude of an EKG signal obtained while the EKG electrodes are shorted together with an impedance is compared to the amplitude of an EKG signal obtained under identical conditions except that the impedance short is not present. The value of the inter-electrode impedance is then equal to one less than the ratio between the unshorted amplitude and the shorted amplitude times the value of the shorting impedance. In a preferred embodiment, the value of the shorting impedance is made equal to the maximum permitted inter-electrode impedance. Then, if the amplitude of the EKG signal taken from a patient decreases upon temporary insertion of the impedance short to a value less than half of the EKG amplitude obtained without the impedance short, the inter-electrode impedance is too high.