Daniel Kent Hansen
Accountancy at Niagara Ct, Denver, CO

5350407, Sep 27, 1994

Dec 30, 1992

7/998962

Lawrence C. McClure - Parker CO
Kent E. Samuelson - Aurora CO
Daniel L. Hansen - Aurora CO

Telectronics Pacing Systems, Inc. - Englewood CO

A61N 1362

607 16

A method and apparatus for selectively controlling an oscillator-driven implantable stimulator to operate either in a quiescent state, in response to a command from an external communicating device, or in an active state in response either to removal of an activation pin or to an activating command from an external communicating device. Upon completion of manufacture of the stimulator, and before being placed on a shelf to await implantation in a patient, the activation pin is inserted into the stimulator and the external communicating device is triggered to send a deactivating command to the stimulator. The stimulator responds by generally disabling current sources to stimulator circuits, while maintaining current sources to a wake up circuit of the stimulator that is associated with communication operations. The stimulator is activated by subsequently transmitting an activating command from an external communicating device to the implantable stimulator, or by removing the activation pin.

5431692, Jul 11, 1995

Aug 2, 1993

8/101508

Daniel L. Hansen - Aurora CO
Anthony J. Ujhazy - Denver CO

Telectronics Pacing Systems, Inc. - Englewood CO

A61N 1362

607 28

A cardiac stimulation device includes a system for testing lead polarity and determining whether the programmed polarity configuration is compatible with an attached pacing and sensing lead. The lead polarity test is based on a measurement of lead impedance performed during the delivery of a pacing pulse. Since the polarity test consists of lead impedance measurements for all polarity configurations, including incompatible configurations, the system provides for backup pacing pulses in a safe configuration to assure pacing support of a patient during all cardiac cycles.