Darrell Van Wagner

US Patent:

6546287, Apr 8, 2003

Filed:

Oct 6, 2000

Appl. No.:

09/680790

Inventors:

William J. Havel - Maple Grove MN
Joe D. Bourland - West Lafayette IN
Leslie A. Geddes - Lafayette IN
Willis A. Tacker - Lafayette IN
Darrell O. Wagner - Isanti MN

Assignee:

Purdue Research Foundation - West Lafayette IN

International Classification:

A61N 136

US Classification:

607 7, 607 8

Abstract:

A controlled-power defibrillator and method of defibrillation for automatically compensating for changes in patient resistance during delivery of a defibrillation pulse. A switching power converter is connected between a storage capacitor and a pair of electrodes adapted for connection to a patients body, either internally or externally. A closed-loop power control circuit is operatively connected to the power converter for control of the power delivered to the patient, the power control circuit generating a target voltage signal for the storage capacitor, the target voltage signal having a defined relationship with the waveform of the power desired to be delivered to the patient. The power control circuit monitors the actual voltage on the storage capacitor and adjusts the delivery of power to the patient as a function of the difference between desired and actual storage capacitor voltage. The power converter is adapted to capture energy from the discharge of an existing defibrillator and to convert captured energy from the existing defibrillator to a waveform different from that generated by the existing defibrillator.

US Patent:

7302294, Nov 27, 2007

Filed:

Apr 2, 2004

Appl. No.:

10/817749

Inventors:

Apurv Kamath - Solana Beach CA, US
Paul Haefner - Circle Pines MN, US
Darrell Orvin Wagner - Isanti MN, US
Marina Brockway - Shoreview MN, US

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 1/365

US Classification:

607 6

Abstract:

Cardiac systems and methods using ECG and blood information for arrhythmia detection and discrimination. Detection circuitry is configured to produce an ECG. An implantable blood sensor configured to produce a blood sensor signal is coupled to a processor. The processor is coupled to the detection and energy delivery circuitry, and used to evaluate and treat cardiac rhythms using both the cardiac electrophysiologic and blood sensor signals. The blood sensor is configured for subcutaneous non-intrathoracic placement and provided in or on the housing, on a lead coupled to the housing, and/or separate to the housing and coupled to the processor via hardwire or wireless link. The blood sensor may be configured for optical sensing, using a blood oxygen saturation sensor or pulse oximeter. A cardiac rhythm may be evaluated using the electrocardiogram signal and the blood sensor signal, and tachyarrhythmias may be treated after confirmation using the blood sense signal.

US Patent:

7349742, Mar 25, 2008

Filed:

Dec 23, 2003

Appl. No.:

10/745341

Inventors:

Ron Heil - Roseville MN, US
Darrell Orvin Wagner - Isanti MN, US
Adam W. Cates - Minneapolis MN, US
Curtis Charles Lindstrom - Roseville MN, US

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 1/05

US Classification:

607116

Abstract:

Subcutaneous systems and leads may be fixed in tissue after placement by use of one or more expanding fixation elements. An expanding fixation element is provided on an implantable lead and configured to secure one or both of a subcutaneous electrode and the lead body within subcutaneous non-intrathoracic tissue. A delivery apparatus comprising a sheath may be included that is configured to introduce the lead to a desired subcutaneous non-intrathoracic location within the patient. A method of lead delivery typically involves introducing a sheath into a subcutaneous non-intrathoracic body location of a patient, providing a lead comprising a lead body and an electrode, and advancing the lead through the sheath and to the subcutaneous non-intrathoracic body location. The method further involves fixing the lead to subcutaneous non-intrathoracic tissue using an expanding fixation element and thereafter removing the sheath from the patient.

US Patent:

7499750, Mar 3, 2009

Filed:

Dec 17, 2003

Appl. No.:

10/738608

Inventors:

Paul Haefner - Circle Pines MN, US
Darrell Orvin Wagner - Isanti MN, US
Jason Alan Shiroff - Shoreview MN, US
Marina Brockway - Shoreview MN, US
Apurv Kamath - Solana Beach CA, US

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61B 5/04
A61N 1/08
A61N 1/37

US Classification:

607 27, 607 62, 600509

Abstract:

Implementing a subcutaneous medical electrode system involves positioning a number of electrode subsystems in relation to a heart so that noise cancellation provides an improved signal to noise ratio of the cardiac signal and/or to provide one electrode arrangement preferential for cardiac signals and another arrangement preferential for noise signals. One of the electrode subsystems so positioned may include one or more can electrodes located on a housing enclosing a medical device. The medical device may be configured to provide therapeutic, diagnostic, or monitoring functions, including, for example, cardiac arrhythmia therapy.

US Patent:

7529592, May 5, 2009

Filed:

Nov 7, 2003

Appl. No.:

10/703410

Inventors:

Adam W. Cates - Minneapolis MN, US
Darrell Orvin Wagner - Isanti MN, US
Curtis Charles Lindstrom - Roseville MN, US
Ron Heil - Roseville MN, US

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 1/08

US Classification:

607120

Abstract:

An implantable subcutaneous device and method employ a lead and an electrode for cardiac monitoring and intervention. The device includes an implantable lead having a lead body, a subcutaneous electrode coupled to the lead body, and a pharmacological agent provided on the implantable lead and/or electrode. The pharmacological agent provides a temporary therapeutic treatment to subcutaneous non-intrathoracic tissue. A method of implanting subcutaneous leads involves providing a lead including a lead body, a subcutaneous electrode, and a pharmacological agent, and delivering the pharmacological agent to subcutaneous non-intrathoracic tissue surrounding the lead.

US Patent:

7555335, Jun 30, 2009

Filed:

Apr 8, 2004

Appl. No.:

10/821206

Inventors:

Apurv Kamath - Solana Beach CA, US
Darrell Orvin Wagner - Isanti MN, US
Paul Haefner - Circle Pines MN, US
Marina Brockway - Shoreview MN, US

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61B 5/0428

US Classification:

600509

Abstract:

Cardiac methods and devices that separate signals using at least two composite signals acquired at least at two input impedances. A target source impedance may be selected, and a cardiac signal may be separated from composite signals using the selected target source impedance. Medical systems include a cardiac device having a housing that provides amplification circuitry configured to have a first amplifier input impedance and a second amplifier input impedance, such as using two separate circuits or switching between two input impedances. One or more electrode assemblies are coupled to the amplification circuitry. A signal processor is provided in the housing configured to separate a source signal using a first composite signal detected at the first input impedance and a second composite signal detected at the second input impedance. The phase response of the first input amplifier circuit is about equal to that of the second input amplifier circuit.

US Patent:

7570997, Aug 4, 2009

Filed:

Apr 8, 2004

Appl. No.:

10/820642

Inventors:

Eric G. Lovett - Roseville MN, US
Adam W. Cates - Minneapolis MN, US
Darrell Orvin Wagner - Isanti MN, US
Mike Favet - San Jose CA, US
Apurv Kamath - Solana Beach CA, US

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 1/362

US Classification:

607 14, 67 4, 67 10, 67 63

Abstract:

Systems and methods provide for sensing of cardiac activity from a subcutaneous, non-intrathoracic location, and detecting a cardiac condition necessitating treatment in response to the sensed cardiac activity. One of a number of cardiac therapies may be selectively delivered to treat the detected cardiac condition, such cardiac therapies including at least a tachycardia therapy, a bradycardia therapy, and an asystole prevention therapy.

US Patent:

7702399, Apr 20, 2010

Filed:

Dec 4, 2003

Appl. No.:

10/728072

Inventors:

Ron Heil - Roseville MN, US
Paul A. Haefner - Circle Pines MN, US
Adam W. Cates - Minneapolis MN, US
Darrell Orvin Wagner - Isanti MN, US
Curtis Charles Lindstrom - Roseville MN, US

Assignee:

Cardiac Pacemakers, Inc. - St. Paul MN

International Classification:

A61N 1/05

US Classification:

607120, 607 3

Abstract:

An implantable subcutaneous device includes a lead and electrode for cardiac monitoring and intervention. The device has an implantable lead including a lead body, a subcutaneous electrode supported by the lead body and a pharmacological agent impelled from the device using phoresis. The pharmacological agent provides a therapeutic treatment to subcutaneous non-intrathoracic tissue. A method of implanting subcutaneous leads involves providing a lead including a lead body, a subcutaneous electrode, and a pharmacological agent and using phoresis to impel the pharmacological agent into subcutaneous non-intrathoracic tissue surrounding the lead.