Dennis A Brumwell

6898463, May 24, 2005

Mar 19, 2002

10/102076

Frank R. Dropps - Maple Grove MN, US
Dennis A. Brumwell - Bloomington MN, US

Medtronic, Inc. - Minneapolis MN

A61N001/37

607 27, 607 34, 607 63

A method and an apparatus for performing a device component failure analysis in an implantable medical device using current consumption data. A current consumption signal relating to current consumption in an implantable medical device is generated. The current consumption signal is then processed. A defect of a component in the implantable medical device is assessed in response to the processing of the current consumption signal and appropriate action is taken, such as selecting alternate therapies, generating an alert signal, and turning off circuits corresponding to the assessed defect.

RE38777, Aug 16, 2005

Dec 13, 1996

08/766634

Theodore P. Adams - Edina MN, US
Dennis A. Brumwell - Bloomington MN, US
Joseph S. Perttu - Chanhassen MN, US
Charles G. Supino - Arden Hills MN, US

Angeion Corp. - Minneapolis MN

A61N001/39

607 5, 607 34, 607 29

An improved dual battery power system uses two separate battery power sources for an implantable cardioverter defibrillator, each having optimized characteristics for monitoring functions and for output energy delivery functions, respectively. The monitoring functions are supplied electrical power by a first battery source, such as a conventional pacemaker power source in the form of a lithium iodide battery which is optimized for long life at very low current levels. The output energy delivery functions are supplied by a separate second battery source, such as a pair of lithium vanadium pentoxide batteries, which is optimized for high current drain capability and low self-discharge for long shelf life. The first battery source provides electrical power only to the monitoring functions of the implantable cardioverter defibrillator, and the second battery source provides all of the electrical power for the output energy delivery functions.

47919353, Dec 20, 1988

Aug 15, 1986

6/896695

Michael D. Baudino - Coon Rapids MN
Michael D. de Franco - Blaine MN
Joseph F. Lessar - Coon Rapids MN
Dennis A. Brumwell - Bloomington MN
Gene A. Bornzin - Camarillo CA
Jeffrey A. Schweitzer - Minneapolis MN

Medtronic, Inc. - Minneapolis MN

A61N 100

128637

A heart pacemaker including a two wave length reflectance oximeter for determining oxygen saturation. The pacing rate is increased or decreased in response to the measured oxygen saturation. By appropriate multiplexing and timing functions, the two wave length reflectance oximeter is included in a pacing lead coupled to the pacemaker which requires only three conductors.

56204647, Apr 15, 1997

Jan 23, 1995

8/376353

Mark W. Kroll - Minnetonka MN
Dennis A. Brumwell - Bloomington MN
Ann M. Donohoo - Shorview MN

Angeion Corporation - Plymouth MN

A61N 139

607 5

A main energy delivery electrical circuit for use in an implantable cardioverter defibrillator device comprises a low power output primary defibrillator battery, a high power output intermediate power intensifying capacitor system, a switch for permitting the intermediate power intensifying capacitor system to rapidly charge a main energy delivery capacitor, and a main energy delivery capacitor. The main energy delivery capacitor is configured for discharging, in a first pulse, an electrical charge derived from the primary battery, and for discharging certain subsequent pulses of electrical charge derived from the intermediate power intensifying capacitor system. The circuit permits the implantable cardioverter defibrillator device to deliver multiple closely spaced defibrillation pulses to a heart.

57499101, May 12, 1998

Jun 7, 1995

8/486759

Dennis A. Brumwell - Bloomington MN
Joseph S. Perttu - Chanhassen MN
Mark W. Kroll - Minnetonka MN
Randall S. Nelson - Pine Springs MN

Angeion Corporation - Plymouth MN

A61N 1375

607 36

An implantable cardioverter defibrillator capable of subcutaneous positioning within a patient delivers at least one electrical cardioversion/defibrillation countershocks to the heart of the patient. The implantable cardioverter defibrillator includes a housing, circuitry positioned within the housing to control delivery of the countershocks, and an energy source coupled with the circuitry to provide electrical energy to a capacitor in the circuitry that stores the electrical energy for delivery of the countershocks. Because the circuitry is susceptible to undesirable electromagnetic coupling effects of origin external to the circuitry, particularly the capacitive coupling effects between the circuitry and the housing of the device when at least a portion of the housing is utilized as an electrode, the implantable cardioverter defibrillator also includes a conductive shield, disposed between the housing and the circuitry, to shield the circuitry against such undesired coupling effects.

49037013, Feb 27, 1990

Mar 10, 1988

7/166591

Alan A. Moore - Blaine MN
Dennis A. Brumwell - Bloomington MN

Medtronic, Inc. - Minneapolis MN

A61N 136

128419PG

A demand pacemaker which regulates its pacing rate based upon sensed oxygen saturation percentage. The pacemaker employs a two wavelength reflectance oximeter as a sensor. The sensor includes an oscillator which sequentially activates red and infrared diodes. The duty cycle of the oscillator is regulated by the relative amounts of red and infrared light reflected by the blood. The construction of the sensor allows the sensor to operate with only two conductors, optimizing it for incorporation in a standard, bipolar pacing lead.

49168304, Apr 17, 1990

Dec 1, 1986

6/936283

Keith Braun - Northwood IA
Larry Stille - Rockford IA
Dennis Brumwell - Bloomington MN

David Manufacturing Company - Mason City IA

F26B 1900

34 48

A control system for a drying system of the type including a drying bin. Discharge particulate material moisture sensing means including a sensor assembly positioned in a discharge auger for sensing the moisture content of the particulate material. Control means is connected to the discharge particulate moisture sensing means and the discharge auger for controlling operation of the discharge auger.

53124545, May 17, 1994

Dec 14, 1992

7/947859

Glenn M. Roline - Anoka MN
Dennis A. Brumwell - Bloomington MN

Medtronic, Inc. - Minneapolis MN

A61N 136

607 22

A monitoring system for an oxygen sensing, dual-wavelength, reflectance oximetry based, rate responsive cardiac pacemaker, is capable of automatically and continually adjusting an oxygen sensor signal comparator threshold such that the effects of noise, sensitivity and drift on oximeter output signals sent to the pacemaker are minimized. A comparator and related circuitry are configured to sample and compare supply excitations for multiple oxygen sensor light sources. The comparator threshold is adjusted as a function of supply excitation for each light source independently of one another, thereby providing an oxygen sensing pacemaker with optimal noise immunity since one of the more vulnerable portions of the pacing system is the transfer of the light source signals which are susceptible to noise.