Cardiac Pacemakers, Inc.

Scott A Reedstrom

Jesse W Hartley

Nicholas J Stessman

James P Nelson

Steven D Check

Marc H Cohen

Paul J Huelskamp

Douglas J Gifford

Keith R Maile

An implantable medical device comprises a non-volatile memory circuit including a configuration memory portion to store auto-configuration data for the IMD, a controller circuit, a reset circuit adapted to generate a reset signal and disable the controller circuit, and a startup circuit adapted to transfer the auto-configuration data from the configuration memory portion to one or more configuration registers in response to the reset signal, wherein values of the one or more configuration registers configure the IMD for a safety mode operation.

Auto-configuration circuit for safety mode operation of implantable medical device

An apparatus comprises an implantable medical device that includes a storage circuit. The storage circuit includes a first stage circuit configured to receive an input signal and to invert and store information about a data bit received in the input signal, a second stage circuit coupled to the output of the first stage circuit to invert and store information about a data bit received from the first stage circuit, and an error circuit coupled to the output of the first stage circuit and an output of the second stage circuit. The error circuit generates an error indication when the storage circuit outputs match while the first stage circuit and the second stage circuit are in an inactive state.

Low power digital design for deep submicron technology

A cardiac rhythm management (CRM) device detects transthoracic impedance, extracts ventilation or other information, and adjusts a delivery rate of the CRM therapy accordingly. A four-phase sequence of alternating direction current pulse stimuli is periodically delivered to a patient's thorax. A transthoracic impedance signal is extracted using a weighted demodulation. Signal processing extracts ventilation information and removes cardiac stroke information using an adaptive lowpass filter. The adaptive filter cutoff frequency is based on the patient's heart rate; a higher cutoff frequency is provided for higher heart rates. Peak/valley detection indicates tidal volume, which is integrated to extract minute ventilation (MV). Short and long term averages are formed and compared to establish a MV indicated rate. Rate adjustment ignores MV information when a noise-measurement exceeds a threshold. An interference avoidance circuit delays delivery of the stimuli when telemetry pulses or other interfering signals are detected.

Rate adaptive cardiac rhythm management device using transthoracic impedance

Rate adaptive cardiac rhythm management device using transthoracic

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Vadnais Heights, MN, United States of America

Scott A Reedstrom