John H Porterfield

US Patent:

20100280397, Nov 4, 2010

Filed:

Jan 28, 2010

Appl. No.:

12/657832

Inventors:

Marc D. Feldman - San Antonio TX, US
John Porterfield - Edmond OK, US
Karthik Raghavan - San Diego CA, US
Jonathan W. Valvano - Austin TX, US
John A. Pearce - Austin TX, US

International Classification:

A61B 5/0215
A61B 5/053
A61B 5/02
A61B 5/08
A61N 1/368

US Classification:

600486, 600547, 600508, 600529, 607 17

Abstract:

An apparatus for determining tissue versus fluid components of an organ include a detector that generates a detector signal based on electrical signals derived from tissue and fluid. The apparatus includes a signal processor in communication with the detector which subtracts in real time a tissue component from the detector signal and produces a fluid volume signal. A method for monitoring a patient's fluid volume of a patient's organ. An apparatus for monitoring a patient's organ. A method for monitoring a patient's organ. A method to piggyback an admittance system onto a AICD/Bi-ventricular Pacemaker for a heart of a patient, in particular a weakened heart having features consistent with congestive heart failure. An apparatus for monitoring an organ, such as a heart, lungs, brain, skeletal muscle, and bladder of a patient which includes a detector which detects the admittance of the organ. The apparatus includes a transmitter in communication with the detector which transmits a wireless signal indicative of the admittance of the organ. A method for monitoring an organ of a patient includes the steps of detecting with a detector the admittance of the organ. There is the step of transmitting with a transmitter in communication with the detector a wireless signal indicative of admittance of the organ.

US Patent:

20110152661, Jun 23, 2011

Filed:

Sep 22, 2010

Appl. No.:

12/924195

Inventors:

Marc D. Feldman - San Antonio TX, US
Anil Tharian George Kottam - London, CA
John Pearce - Austin TX, US
Jonathan Valvano - Austin TX, US
John Porterfield - Austin TX, US

International Classification:

A61B 5/0408
A61B 5/0402

US Classification:

600393, 600509

Abstract:

A method for identifying the viability of ischemic myocardium of a patient. The method includes the steps of measuring in real-time the ischemic myocardium of a beating or non-beating heart. There is the step of determining in real-time whether the ischemic myocardium of the beating or non-beating heart is stunned or is nonviable. An apparatus for identifying the viability of ischemic myocardium of a patient's heart. The apparatus includes an electrode array having at least four electrodes for electrical communication with the heart which produces an array signal. The apparatus includes a processor portion in communication with the array which receives the array signal and determines in real-time whether the ischemic myocardium of the heart is stunned or is nonviable. An apparatus for analyzing living tissue. The apparatus includes an electrode array having at least four electrodes for electrical communication with the tissue which produces an array signal. The apparatus includes an admittance magnitude and phase detection circuit in communication with the array which receives the array signal from the array and produces a detection circuit signal corresponding to phase angle and magnitude of the array and signal. The apparatus includes a processor in communication with the detection circuit which receives the detection circuit signal and determines permittivity and conductivity of the tissue in real-time. A method for analyzing living tissue.

US Patent:

20120150252, Jun 14, 2012

Filed:

Dec 2, 2011

Appl. No.:

13/373850

Inventors:

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

International Classification:

A61N 1/365
A61N 1/362

US Classification:

607 18, 607 9

Abstract:

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.

US Patent:

20130023946, Jan 24, 2013

Filed:

Mar 20, 2012

Appl. No.:

13/425119

Inventors:

Jonathan W. Valvano - Austin TX, US
Marc D. Feldman - San Antonio TX, US
John Porterfield - Austin TX, US
John A. Pearce - Austin TX, US
Erik Larson - Austin TX, US
Lev Shuhatovich - Houston TX, US
Kathryn Loeffler - Leander TX, US
Raffaele Cetrulo - Austin TX, US

International Classification:

A61N 1/365

US Classification:

607 18, 607 17

Abstract:

An apparatus for measuring complex electrical admittance and/or complex electrical impedance in animal or human patients includes a first electrode and at least a second electrode which are adapted to be disposed in the patient. The apparatus includes a housing adapted to be disposed in the patient. The housing has disposed in it a stimulator in electrical communication with at least the first electrode to stimulate the first electrode with either current or voltage, a sensor in electrical communication with at least the second electrode to sense a response from the second electrode based on the stimulation of the first electrode, and a signal processor in electrical communication with the sensor to determine the complex electrical admittance or impedance of the patient.

US Patent:

20220339425, Oct 27, 2022

Filed:

Apr 22, 2021

Appl. No.:

17/238181

Inventors:

Jonathan W. Valvano - Austin TX, US
John Porterfield - Austin TX, US
Clay Heighten - Dallas TX, US
Anil Kottam - Cedar Park TX, US
Marc David Feldman - San Antonio TX, US
Drew R. Nolen - San Antonio TX, US

Assignee:

Board of Regents, The University of Texas System - Austin TX
CardioVol, LLC - Dallas TX

International Classification:

A61M 60/515
A61M 60/237
A61M 60/531
A61M 60/867
A61M 60/13
A61M 60/816
A61M 60/523
A61M 60/165
G16H 40/63
G16H 20/30
G05B 19/04

Abstract:

An apparatus for a heart of a patient having a cardiac assist device adapted to be implanted into the patient to assist the heart with pumping blood. The apparatus has a sensor adapted to be implanted into the patient. The sensor in communication with the cardiac assist device and the heart which measures native volume of the heart. Alternatively, the sensor monitors the heart based on admittance while the cardiac assist device. Alternatively, the sensor monitors the heart based on impedance.

US Patent:

20220339426, Oct 27, 2022

Filed:

Aug 19, 2021

Appl. No.:

17/407138

Inventors:

Marc David Feldman - San Antonio TX, US
John Porterfield - Austin TX, US
Clay Heighten - Dallas TX, US

Assignee:

Board of Regents, The University of Texas System - Austin TX
CardioVol, LLC - Dallas TX

International Classification:

A61M 60/515
A61M 60/13
A61M 60/139
A61M 60/295
A61M 60/113
A61M 60/38
A61M 60/497

Abstract:

An apparatus for a heart of a patient having a cardiac assist device adapted to be implanted into the patient to assist the heart with pumping blood. The apparatus has a sensor adapted to be implanted into the patient. The sensor in communication with the cardiac assist device and the heart which measures native volume of the heart. The apparatus has a first cardiac assist device and a second cardiac assist device tuned to maximize blood flow to the body of the patient, while resting the heart so the heart may recover function. Alternatively, the sensor monitors the heart based on admittance while the cardiac assist device. Alternatively, the sensor monitors the heart based on impedance.

US Patent:

20220339427, Oct 27, 2022

Filed:

Apr 22, 2021

Appl. No.:

17/238191

Inventors:

John Porterfield - Austin TX, US
Jonathan W. Valvano - Austin TX, US
Clay Heighten - Dallas TX, US
Anil Kottam - Cedar Park TX, US
Marc David Feldman - San Antonio TX, US
Drew R. Nolen - San Antonio TX, US

Assignee:

Board of Regents, The University of Texas System - Austin TX
CardioVol, LLC - Dallas TX

International Classification:

A61M 60/523
A61M 60/178
A61M 60/531
A61M 60/538

Abstract:

An apparatus for a heart of a patient having a cardiac assist device adapted to be implanted into the patient to assist the heart with pumping blood. The apparatus has a sensor adapted to be implanted into the patient. The sensor in communication with the cardiac assist device and the heart which measures native volume of the heart. Alternatively, the sensor monitors the heart based on admittance while the cardiac assist device. Alternatively, the sensor monitors the heart based on impedance.

US Patent:

20220339428, Oct 27, 2022

Filed:

Apr 22, 2021

Appl. No.:

17/238167

Inventors:

John Porterfield - Austin TX, US
Jonathan W. Valvano - Austin TX, US
Clay Heighten - Dallas TX, US
Anil Kottam - Cedar Park TX, US
Marc David Feldman - San Antonio TX, US
Drew R. Nolen - San Antonio TX, US

Assignee:

Board of Regents, The University of Texas System - Austin TX
CardioVol, LLC - Dallas TX

International Classification:

A61M 60/804
A61M 60/216
A61M 60/585
A61M 60/139
A61M 60/531

Abstract:

An apparatus for a heart of a patient having a cardiac assist device adapted to be implanted into the patient to assist the heart with pumping blood. The apparatus has a sensor adapted to be implanted into the patient. The sensor in communication with the cardiac assist device and the heart which measures native volume of the heart. Alternatively, the sensor monitors the heart based on admittance while the cardiac assist device. Alternatively, the sensor monitors the heart based on impedance.