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:
Aug. 07, 1990
Filed:
Jun. 06, 1989
Neal E Fearnot, West Lafayette, IN (US);
Kevin S Heggs, Monroeville, PA (US);
William L Johnson, Kittanning, PA (US);
Donald A Stevens, Spring Church, PA (US);
Cook Pacemaker Corporation, Leechburg, PA (US);
Medical Engineering & Development Institute, Inc., West Lafeyette, IN (US);
Abstract
A pacemaker is disclosed with a pacing rate that is restricted within a range defined by variable upper and lower rate limits that change as a function of the patient's detected level of activity. An indication such as the nonambient temperature of blood is sensed in the right ventricle of the heart to indicate detected activity level. Other activity indications, such as blood oxygen concentration and body motion, either singly or in combination are also disclosed. A control circuit of the pacemaker varies the upper and lower rate limits according to the patient's detected level of activity. The control circuit also varies the atrial and ventricular refractory periods along with the AV delay period in response to detected activity level changes.