Frank Walmsley

Author:

Frank Walmsley

ISBN #:

0201104229

Author:

Frank Walmsley

ISBN #:

0130759457

US Patent:

56742550, Oct 7, 1997

Filed:

Dec 14, 1995

Appl. No.:

8/572858

Inventors:

Frank R. Walmsley - North Oaks MN
Arthur L. Olive - Stacy MN
Jan Pieter Heemels - Minneapolis MN

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 1368

US Classification:

607 14

Abstract:

A dual chamber pacemaker incorporating an adaptive PVARP for breaking pacemaker mediated tachycardia episodes and adjusting the PVARP interval in a way that reduces future incidences of PMT without extending PVARP beyond what is required.

US Patent:

58911758, Apr 6, 1999

Filed:

Dec 26, 1996

Appl. No.:

8/773877

Inventors:

Frank R Walmsley - North Oaks MN
Jan-Pieter Heemels - Minneapolis MN

Assignee:

Cardiac Pacemakers - St. Paul MN

International Classification:

A61N 1365

US Classification:

607 17

Abstract:

Pacemakers have been known to be provided with a lower rate hysteresis mode in which a range of cardiac activity is supported in a hysteresis loop by a pacemaker. The present invention describes a programmable single or dual chamber pacemaker comprising a sensor device which provides signals indicating a level of cardiac activity. The pacemaker has a standard lower rate hysteresis mode available, but is also provided with a sensor rate hysteresis which may be programmable. The signals from the sensor can cause the pacemaker to operate within a hysteresis loop in which at least one of the A-sense Rate and the V-sense Rate in the sensor rate hysteresis is higher than the similar rate in the lower rate hysteresis.

US Patent:

43633250, Dec 14, 1982

Filed:

Jan 19, 1981

Appl. No.:

6/226304

Inventors:

Glenn Roline - Anoka MN
Frank Walmsley - New Brighton MN

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61N 136

US Classification:

128419PG

Abstract:

A multiple-mode pacer which automatically switches from an atrial synchronous mode to a ventricular inhibited mode when the intrinsic atrial rate drops below a preset hysteresis rate. This mode switching prevents atrial bradycardia from resulting in the delivery of closely spaced ventricular stimulating pulses.