Medtronic, Inc.

Other

John T Meador

Mark R Boone

Lonny V Cabelka

Randolph E Crutchfield

Kevin Patrick Kuehn

Keith Alan Miesel

Craig L Schmidt

John Daniel Norton

Lee Stylos

Robert T Taepke

Louis E Halperin

Brian M Mann

Rahul Mehra

Michael F Hess

John G Keimel

Herman Lee Renger

Michael R Hill

Pat L Gordon

R Hardwin Mead

An implantable medical device includes a low-power circuit and a multi-cell power source. The cells of the power source are coupled in a parallel configuration. The implantable medical device includes both a low power circuit that is selectively coupled between the first and second cells and a high power output circuit that is directly coupled to the first and second cells in a parallel configuration. An isolation circuit is coupled to the first cell, the second cell and the low power circuit to maintain a current isolation between the first cell and the second cell at least during delivery of current having a large magnitude to the high power output circuit.

Implantable medical devices having multi-cell power sources

An implantable medical device includes a low-power circuit, a high-power circuit, and a dual-cell power source. The power source is coupled to a dual-transformer such that each cell is connected to only one of the transformers. Each transformer includes multiple windings and each of the windings is coupled to a capacitor, and the capacitors are all connected in a series configuration. The low power circuit is coupled to the power source and issues a control signal to control the delivery of charge from the power source to the plurality of capacitors through the first and second transformers.

Multiple transformer charging circuits for implantable medical devices

An implantable medical device includes a low-power circuit and a multi-cell power source. The cells of the power source are coupled to a transformer in a parallel configuration. The transformer includes multiple secondary windings and each of the windings is coupled to a capacitor that stores energy for delivery of a therapy to a patient. In accordance with embodiments of this disclosure, the low power circuit is configured to control simultaneous delivery of energy from each of the cells to a plurality of capacitors through the transformer.

Multi-primary transformer charging circuits for implantable medical devices

An implantable medical device includes a low-power circuit and a multi-cell power source. The cells of the power source are coupled in a parallel configuration. The implantable medical device includes both a low power circuit that is selectively coupled between the first and second cells and a high power output circuit that is directly coupled to the first and second cells in a parallel configuration. An isolation circuit is coupled to the first cell, the second cell and the low power circuit to maintain a current isolation between the first cell and the second cell at least during delivery currents having a large magnitude that are delivered to the high power output circuit.

An implantable medical device includes a low-power circuit, a high-power circuit, and a dual-cell power source. The power source is coupled to a transformer having first and second primary windings, each of which is selectively coupled to the power source and a plurality of secondary windings that are magnetically coupled to the first and second primary windings. The plurality of secondary windings are interlaced along a length of each of the secondary windings. Each of the plurality of secondary transformer windings is coupled to a capacitor, and the capacitors are all connected in a series configuration. The low power circuit is coupled to the power source and issues a control signal to control the delivery of charge from the power source to the plurality of capacitors through the first and second transformers.

Transformer-based charging circuits for implantable medical devices

An implantable barometric pressure sensor coupled with an implantable medical device (IMD) provides a barometric pressure related, reference pressure value for use in combination with an absolute pressure value measured by an implantable absolute pressure sensor coupled to the IMD. In one embodiment, the barometric pressure sensor is implanted under the skin and subcutaneous tissue layer at or near the implant site of the IMD. In variations of this embodiment, the barometric pressure is formed as part of a connector module of the IMD or extends from the connector module. In a further embodiment, a percutaneous access device is provided which is adapted to be implanted to extend through the skin and subcutaneous tissue layer of the patient and is coupled with the barometric pressure sensor to provide for an air chamber extending between the atmosphere and the barometric pressure sensor. The barometric pressure sensor is preferably enclosed within an air chamber of the implantable medical device, and a catheter extends between the air chamber of the implantable medical device and the percutaneous access device. Or the barometric pressure sensor is enclosed within an air chamber of the percutaneous access device, and a lead extends between the barometric pressure sensor and the implantable medical device.

Implantable medical device for sensing absolute blood pressure and barometric pressure

Implantable medical device for sensing absolute blood pressure and

New pacing algorithm defines faster than indicated pacing rate during detection of PAC's/PVC's and reduces rate after awhile to a safety rate unless natural depolarizations are detected.

Arrhythmia and fibrillation prevention pacemaker using ratchet up and

A combined pacing and cardioversion lead system with internal electrical switching components for unipolar or bipolar sensing of electrograms, pacing at normal pacing voltages and cardioversion or defibrillation. In bipolar embodiments, an indifferent electrode, closely spaced to a sensing and pacing electrode, is coupled in common through the integral switching circuitry to a large surface area cardioversion electrode. In these embodiments, pacing and sensing is accomplished through a pair of conductors extending through the lead system to the closely spaced active and indifferent electrode pair. When cardioversion energy is applied to the indifferent electrode, the cardioversion energy is also directed to the cardioversion electrode through operation of the switching circuitry in response to the magnitude of the applied cardioversion pulse. In unipolar embodiments, a distal sensing and pacing electrode is coupled through integral switching circuitry to a large surface area cardioversion electrode. In these embodiments, only a single conductor extending through the lead to the pacing and sensing electrode is required. When cardioversion energy is applied to the pacing and sensing electrode, the cardioversion energy is also directed to the cardioversion electrode through operation of the switching circuitry in response to the magnitude of the applied cardioversion pulse.

Pacing and cardioversion lead systems with shared lead conductors

A programmable cardiac tissue stimulator having a receiving coil and RF pulse width check/data separator (6) for receiving programming data, a communications State sequencer (8) for directing the sequence of command activities within the apparatus, command decode and address latch (12), memory (16, 18, 20, 22, 30, 40, 42) for storing the received programming data, pulse generator logic (24) for generating an output stimulation pulse according to a programmed stimulation scheme, a first timer (32), a second timer (34) and third timer (44) interactive with the pulse generator (24) and memory (16, 18, 20, 22, 30, 40, 42) for carrying out the timing functions of the pulse generator logic (24), a first sensor (46) for sensing electrical activity in the atrium, a second sensor (48) for sensing electrical activity in the ventricle, antitachycardia logic (50) for limiting the rate of natural stimulation of cardiac tissue, an output lead (54) to the atrium, an output lead (56) to the ventricle, and a control clock (28) for controlling timing within the apparatus.

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Half Moon Bay, CA, United States of America

John T Meador