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:
Apr. 02, 2002
Filed:
Sep. 14, 1999
Sharon Johnson, Lino Lakes, MN (US);
Frank Dropps, Maple Grove, MN (US);
Jean-Cheui Hsung, Shoreview, MN (US);
James Marcotte, Arden Hills, MN (US);
Angeion Corporation, Minneapolis, MN (US);
Abstract
A deterministic and jitter-free dual chamber brady pacemaker utilizes both a programmed microprocessor and a hardware state machine, both of which are coupled to a real time clock (RTC), random access memory (RAM) and a common escape interval timer. Time of occurrence (TOC) data representative of the time and nature of atrial and ventricular sensed events and pacing events is stored in the RAM. Escape interval periods are timed by the escape interval timer. The microprocessor is operable in both an active mode and an inactive mode without interrupts. In response to the receipt of wakeup commands, the microprocessor operates in the active mode and uses the TOC data from the RAM to reset the escape interval timer to a desired next event interval. The hardware state machine uses the common escape interval timer for timing timeout events and atrial and ventricular sensed events such that pacing pulses are delivered in a determinate manner.