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. 15, 1987
Filed:
Mar. 27, 1985
Hans T Thornander, Paris, FR;
John W Poore, Chatsworth, CA (US);
Jason A Sholder, Canoga Park, CA (US);
James R Thacker, Saugus, CA (US);
David C Amundson, Pacific Palisades, CA (US);
Siemens-Elema AB, Solna, SE;
Abstract
A pacemaker and physiological sensor for use therewith that allows the rate at which the pacemaker delivers electrical stimulation pulses to the heart, or the escape interval during which a natural heart event must occur before an electrical stimulation pulse is delivered, to be adjusted as needed in order to satisfy the body's physiological needs. The sensor measures the depolarization time interval between an atrial stimulation pulse, A, and the responsive atrial or ventricle depolarization, P or R respectively, as an indication of the physiological demands placed on the heart. The time interval between a ventricular stimulation pulse, V, and the responsive ventricular depolarization, R, may also be measured and used as an indication of physiological need, and hence as an alternative criteria for rate control. Atrial depolarization is sensed by detecting a P-wave, and ventricular depolarization is preferably sensed by detecting an R-wave. A method of measuring A-P, A-R, or V-R intervals is used to ascertain if these intervals are increasing or decreasing. If, over several heart cycles or beats, an increase or decrease in these measurements is detected, the pacing interval set by the pacemaker is adjusted in an appropriate direction in order to adjust the heart stimulation rate accordingly.