Douglas A Lang

US Patent:

6490485, Dec 3, 2002

Filed:

Oct 6, 1999

Appl. No.:

09/413663

Inventors:

Weimin Sun - Plymouth MN
Bruce H. KenKnight - Maple Grove MN
Douglas J. Lang - Arden Hills MN

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 1365

US Classification:

607 20, 607 18

Abstract:

Methods of adjusting output mapping in response to historical signal input data relative to a reference value, and apparatus to perform the methods. The methods are suited for use in adjusting rate-adaptive pacemakers in response to a patients demonstrated activity relative to a predetermined activity level. The methods include using historical physiologic sensor input to derive a patients activity. The methods further include tuning a rate-adaptive curve in response to a demonstrated exertion level and a demonstrated exertion time indicative of a breadth and frequency of a patients activity above some reference value. Pacemakers adapted to perform the methods include a processor, at least one physiologic sensor, a variable-rate pulse generator and a memory for storing historical physiologic sensor data.

US Patent:

6512951, Jan 28, 2003

Filed:

Sep 14, 2000

Appl. No.:

09/661875

Inventors:

Alan F. Marcovecchio - Minneapolis MN
Milton M. Morris - Minneapolis MN
Steven D. Girouard - Woodbury MN
Douglas J. Lang - Arden Hills MN

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 139

US Classification:

607 5

Abstract:

An apparatus and method for delivering electrical shock therapy in order to treat atrial tachyarrhythmias such as fibrillation is disclosed. In accordance with the method, atrial defibrillation shocks are delivered synchronously with an R wave if the current R-R interval meets one or more safety criteria so as to be considered shockable. A shockable R-R interval may be defined as one that exceeds the previous QT interval by a specified therapy margin. In one embodiment, the previous QT interval is estimated based upon the measured preceding R-R interval.

US Patent:

6519495, Feb 11, 2003

Filed:

Aug 15, 2000

Appl. No.:

09/638975

Inventors:

Weimin Sun - Plymouth MN
Bruce R. Jones - Hopkins MN
Douglas J. Lang - Arden Hills MN

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 136

US Classification:

607 18, 607 19

Abstract:

A method and system for automatically adjusting the operating parameters of a rate-adaptive cardiac pacemaker in which maximum exertion levels attained by the patient are measured at periodic intervals and stored in order to compute or update a maximum exercise capacity. The slope of the rate-response curve is then adjusted to map an exertion level corresponding to the updated maximum exercise capacity to a maximum allowable pacing rate. In accordance with the invention, a maximum exercise capacity is determined by cross-checking periodic maximum exertion level sensor values with a motion-level sensor value.

US Patent:

6687541, Feb 3, 2004

Filed:

Dec 30, 2002

Appl. No.:

10/334397

Inventors:

Alan F. Marcovecchio - Minneapolis MN
Milton M. Morris - Minneapolis MN
Steven D. Girouard - Woodbury MN
Douglas J. Lang - Arden Hills MN

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 139

US Classification:

607 5

Abstract:

An apparatus and method for delivering electrical shock therapy in order to treat atrial tachyarrhythmias such as fibrillation is disclosed. In accordance with the method, atrial defibrillation shocks are delivered synchronously with an R wave if the current R-R interval meets one or more safety criteria so as to be considered shockable. A shockable R-R interval may be defined as one that exceeds the previous QT interval by a specified therapy margin. In one embodiment, the previous QT interval is estimated based upon the measured preceding R-R interval.

US Patent:

6823214, Nov 23, 2004

Filed:

Sep 8, 2000

Appl. No.:

09/657402

Inventors:

Weimin Sun - Plymouth MN
Bruce R. Jones - Hopkins MN
Douglas J. Lang - Arden Hills MN
Donald Hopper - Maple Grove MN

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 118

US Classification:

607 17, 607 18, 607 19

Abstract:

A system and method for automatically adjusting the operating parameters of a rate-adaptive cardiac pacemaker. In accordance with the method, maximum exertion levels attained by the patient are measured at periodic intervals and stored. The stored maximum exertion levels may then be used to update a long-term maximal exertion level, and the slope of the rate-response curve is adjusted to map the updated long-term maximal exertion level to a maximum allowable pacing rate. The stored maximum exertion levels may also be used to update a sensor target rate which is used to adjust the slope of the rate response curve.

US Patent:

6839593, Jan 4, 2005

Filed:

Sep 8, 2000

Appl. No.:

09/657404

Inventors:

Weimin Sun - Plymouth MN, US
Bruce R. Jones - Hopkins MN, US
Douglas J. Lang - Arden Hills MN, US
Donald Hopper - Maple Grove MN, US

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 118

US Classification:

607 17, 600520

Abstract:

A system and method for automatically adjusting the operating parameters of a rate-adaptive cardiac pacemaker in which maximum exertion levels attained by the patient are measured at periodic intervals and stored. The stored maximum exertion levels may then be used to update a long-term maximal exertion level, and the slope of the rate-response curve is adjusted to map the updated long-term maximal exertion level to a maximum allowable pacing rate. In accordance with the invention, the rate response curve is defined such that an exertion level corresponding to the patient's maximum exercise capacity would be mapped to a physiologically favorable maximum rate that is independent from a specified maximum sensor indicated rate.

US Patent:

7079897, Jul 18, 2006

Filed:

May 6, 2004

Appl. No.:

10/839875

Inventors:

Weimin Sun - Plymouth MN, US
Bruce R. Jones - Hopkins MN, US
Douglas J. Lang - Arden Hills MN, US
Donald Hopper - Maple Grove MN, US

Assignee:

Cardiac Pacemakers, Inc. - Saint Paul MN

International Classification:

A61N 1/18

US Classification:

607 19

Abstract:

A system and method for automatically adjusting the operating parameters of a rate-adaptive cardiac pacemaker. In accordance with the method, maximum exertion levels attained by the patient are measured at periodic intervals and stored. The stored maximum exertion levels may then be used to update a long-term maximal exertion level, and the slope of the rate-response curve is adjusted to map the updated long-term maximal exertion level to a maximum allowable pacing rate. The stored maximum exertion levels may also be used to update a sensor target rate which is used to adjust the slope of the rate response curve.

US Patent:

7089055, Aug 8, 2006

Filed:

Jun 28, 2002

Appl. No.:

10/184019

Inventors:

Adam W. Cates - Minneapolis MN, US
Eric G. Lovett - Roseville MN, US
Douglas J. Lang - Arden Hills MN, US

Assignee:

Cardiac Pacemakers, Inc. - Saint Paul MN

International Classification:

A61N 1/36
A61N 1/39

US Classification:

607 4, 607 5, 607 14

Abstract:

An apparatus and method is presented for improving cardiac function after successful termination of a tachyarrhythmia such as ventricular fibrillation. A series of electrical stimulation pulses are delivered prior to a defibrillation shock if one or more specific criteria are met.