Cardiac Pacemakers, Inc.

Blair Erbstoeszer

Mark Rutzer

Karl F Gauglitz

Thomas M Bocek

Lorin W Matthews

William E Reagor

Kristofer J James

Glenn Morita

Brendan Early Koop

Christian Richard Trifilio

John M Edgell

Lawrence David Swanson

David A Chizek

John E Hansen

Benjamin L Somberg

Mark G Deehr

Michael J Kloosterboer

Fareed Assad

Kimberly S Gerst

Noel Doherty

Mee S Burckhardt

Systems and methods for sensing external magnetic fields in implantable medical devices are provided. One aspect of this disclosure relates to an apparatus for sensing magnetic fields. An apparatus embodiment includes a sensing circuit with at least one inductor having a magnetic core that saturates in the presence of a magnetic field having a prescribed flux density. The apparatus embodiment also includes an impedance measuring circuit connected to the sensing circuit. The impedance measuring circuit is adapted to measure impedance of the sensing circuit and to provide a signal when the impedance changes by a prescribed amount. According to an embodiment, the sensing circuit includes a resistor-inductor-capacitor (RLC) circuit. The impedance measuring circuit includes a transthoracic impedance measurement module (TIMM), according to an embodiment. Other aspects and embodiments are provided herein.

Systems and methods for sensing external magnetic fields in implantable medical devices

An apparatus includes an implantable housing, a header including a cavity, a post extending from a surface of the housing into the cavity, the post including an expanded head portion, and a retaining member mounted within the header and engaged with the post with a bottom surface of the retaining member abutting an internal surface of the header.

Apparatus and method for attaching a header to a housing of an implantable device

Method and apparatus for converting the output of a thermoelectric generator to voltages compatible with implantable medical devices is provided. One apparatus includes an implantable thermoelectric generator. The apparatus includes an input terminal for receiving an input voltage generated by a thermoelectric energy converter and a charging inductor connected in series with the input terminal. The apparatus also includes a switching Field Effect Transistor (FET) connected to the inductor, and a capacitor connected to the FET and the input terminal via a diode. The FET is switched with a frequency and duty cycle such that a voltage level at an output terminal is compatible with an implantable medical device. According to various embodiments, the FET is switched using a closed loop feedback system that controls the frequency and duty cycle based on an observed voltage level at the output terminal. Other aspects and embodiments are provided herein.

Power converter for use with implantable thermoelectric generator

An implantable medical device lead includes an insulative lead body, an outer conductive coil extending through the lead body, and an inner conductive coil extending coaxially with the outer conductive coil. The outer conductive coil is coupled to a proximal electrode at a distal end of the outer conductive coil, and the inner conductive coil is coupled to a distal electrode at a distal end of the inner conductive coil. A cooling assembly is thermally coupled to the distal electrode to dissipate heat generated at the distal electrode during exposure to magnetic resonance imaging (MRI) fields.

Implantable electrical lead including a cooling assembly to dissipate MRI induced electrode heat

One embodiment of the present subject matter includes an apparatus with a first housing portion which is thermally conductive and which has a first case opening; a second housing portion which is thermally conductive and which has a second case opening, the second case opening being hermetically sealed to the first case opening, with the first housing portion and the second housing portion at least partially defining an interior volume; cardiac rhythm management electronics disposed in the interior volume; a thermal shunt disposed in the interior volume; and a thermoelectric energy converter disposed in the interior volume and adjacent the thermal shunt, the thermoelectric energy converter having a first pole and a second pole, with the first pole thermally connected to the first housing portion, and the second pole thermally connected to the shunt.

Method and apparatus for shunt for in vivo thermoelectric power system

The present subject matter includes a first housing portion which is thermally conductive and which has a first housing opening, a second housing portion which is thermally conductive and which has a second housing opening, the second housing opening being hermetically sealed to the first housing opening, with the first housing portion and the second housing portion at least partially defining an interior volume, cardiac rhythm management electronics disposed in the interior volume, and a thermoelectric energy converter disposed in the interior volume, the thermoelectric energy converter having a hot pole and a cold pole, with the hot pole thermally connected to the first housing portion, and the cold pole thermally connected to the second housing portion.

Method and apparatus for in vivo thermoelectric power system

Remote patient management communication device

Growing community of inventors

Kirkland, WA, United States of America

Blair Erbstoeszer