JOHN GILL PEARCE
Pilots at Uplands Rdg Dr, Austin, TX

6494832, Dec 17, 2002

Aug 28, 2000

09/649727

Marc D. Feldman - San Antonio TX
Jonathan W. Valvano - Austin TX
John A. Pearce - Austin TX

Conductance Technologies, Inc. - San Antonio TX

A61B 500

600301

An apparatus and method for determining cardiac performance in a patient. The apparatus includes a multifrequency conductance catheter for measuring instantaneous volume of a heart chamber with multifrequencies. The apparatus includes a mechanism for measuring instantaneous pressure of the heart chamber. The apparatus includes a mechanism for separating the multifrequencies. The apparatus includes a mechanism for signal processing the instantaneous volume and the pressure of the heart chamber to identify mechanical strength of the chamber and for automatically producing a plurality of desired waveforms at desired frequencies for the conductance catheter. The processing mechanism is connected to the pressure measuring mechanism, the separating mechanism and the volume measuring mechanism.

5675814, Oct 7, 1997

Jan 26, 1996

8/591850

John J. Pearce - Austin TX

Dell USA, L.P. - Round Rock TX

G06F 1300, G06F 946

395750

A portable computer is provided in which the consumption of power by the I/O ports of the computer is reduced. The processor of the computer distinguishes port I/O operations that require an actual data transfer from port I/O operations that do not require an actual data transfer. The I/O ports of the computer remain off until an I/O operation involving an actual data transfer at a particular port is required. When an I/O operation which requires an actual data transfer is encountered, then the appropriate port is powered up. In this manner, power consumption by the I/O ports of the computer is significantly reduced. Advantageously, the disclosed technique for reducing power consumption by the I/O ports of the computer is operating system independent. In this manner, the power management feature functions regardless of which particular operating system or application software is installed on the computer.

2012015, Jun 14, 2012

Dec 2, 2011

13/373850

Marc D. Feldman - San Antonio TX, US
John Porterfield - Austin TX, US
Erik Larson - Austin TX, US
Jonathan W. Valvano - Austin TX, US
John A. Pearce - Austin TX, US

A61N 1/365, A61N 1/362

607 18, 607 9

An apparatus for treating a heart of a patient includes a first lead and at least a second lead for pacing the heart adapted to be in electrical communication with the heart. The apparatus includes a microcontroller in communication with the first and second leads which triggers the first lead at either different times or the same time from when the microcontroller triggers the second lead. Alternatively, the apparatus includes a microcontroller in communication with the first and second leads that determines heart volume, including stroke volume, end-systolic volume, and calculated values including ejection fraction, from admittance from signals from the first and second leads and uses the admittance as feedback to control heart volume ejected, as measured by stroke volume, calculated values such as ejection fraction, and control end-systolic volume, with respect to the first and second leads. A method for treating the heart of a patient.

7925335, Apr 12, 2011

Sep 3, 2004

10/568912

Marc D. Feldman - San Antonio TX, US
Jonathan W. Valvano - Austin TX, US
John A. Pearce - Austin TX, US
Chia-Ling Wei - Tainan, TW

Board of Regents, The University of Texas System - Austin TX

A61N 5/04

600513

An apparatus for determining cardiac performance in the patient involving a conductance catheter () for measuring conductance and blood volume in a heart chamber of the patient. The apparatus includes a processor () for determining instantaneous volume of the ventricle by applying a non-linear relationship between the measured conductance and the volume of blood in the heart chamber to identify mechanical strength of the chamber. The processor () is in communication with the conductance catheter ().

5694582, Dec 2, 1997

Jan 26, 1996

8/592503

John J. Pearce - Austin TX

Dell USA, LP - Round Rock TX

G06F 946

395500

System management mode (SMM) is utilized, despite operating system security measures, by furnishing a polled interface for SMM. When an application program is to make an XBIOS call, the application program posts an XBIOS request in a storage. SMM is activated periodically by a timer and, during activation, checks the storage for XBIOS requests. When an XBIOS request is posted, SMM processes the request XBIOS command and leaves a response from the XBIOS call in the storage. The application program, which continually loops, monitors the storage and detects replacement of the XBIOS request by the XBIOS result to realize completion of an XBIOS call.