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:
Dec. 08, 1992
Filed:
Jun. 17, 1991
Raul Chirife, 1640 Martinez, Buenos Aires, AR;
Other;
Abstract
A rate responsive pacemaker uses isovolumic contraction time (IVCT) as a control signal responsive to metabolic demands. This control signal is injected into the timing circuit of a standard rate adaptive pacemaker to enhance the pacer's ability to respond in direct relation to the patient's changing metabolic needs as he performs his daily activities. A typical configuration, uses the duration of either right or left heart IVCT for rate control. The device has two inputs to measure IVCT: one, signaling the onset of mechanical activation of the ventricle, and another, signaling the onset of ejection. The time interval between these two signals is the duration of IVCT, which is processed by the pacemaker to determine the escape interval.