Michael Phillip Quinn

US Patent:

6355001, Mar 12, 2002

Filed:

May 13, 1996

Appl. No.:

08/645391

Inventors:

Michael D. Quinn - Plano TX
Mark L. Yelderman - Plano TX

Assignee:

Edwards Lifesciences Corporation - Irvine CA

International Classification:

A61B 500

US Classification:

600505, 600526

Abstract:

A thermodilution catheter having a heating filament which is fabricated so as to be thin and flexible enough to avoid contact with the patients blood. The heating filament is either inserted in a preformed catheter lumen, incorporated into a wall of the catheter body itself, or wrapped around the catheter body wall and surrounded by an external sheath. Generally, the covering of the heating filament is minimally thin so as to allow the heat from the heating filament to be transferred to the surrounding blood and to minimally increase the overall cross-sectional area. Since the heating filament does not directly touch the patients blood, the outer surface may be made smooth so as to prevent inducement of blood clots. In addition, the heating filament may be maintained at a safe temperature by forming the heating element of a flexible material having a high temperature coefficient of resistance, low thermal capacitance and high thermal conductivity. Preferably, the temperature coefficient of resistance of the material forming the heater filament is greater than 0.

US Patent:

6387052, May 14, 2002

Filed:

Apr 19, 1993

Appl. No.:

08/049231

Inventors:

Michael D. Quinn - Plano TX
Mark L. Yelderman - Plano TX

Assignee:

Edwards Lifesciences Corporation - Irvine CA

International Classification:

A61B 500

US Classification:

600505, 600526

Abstract:

A thermodilution catheter having a heating filament which is fabricated so as to be thin and flexible enough to avoid contact with the patients blood. The heating filament is either inserted in a preformed catheter lumen, incorporated into a wall of the catheter body itself, or wrapped around the catheter body wall and surrounded by an external sheath. Generally, the covering of the heating filament is minimally thin so as to allow the heat from the heating filament to be transferred to the surrounding blood and to minimally increase the overall cross-sectional area. Since the heating filament does not directly touch the patients blood, the outer surface may be made smooth so as to prevent inducement of blood clots. In addition, the heating filament may be maintained at a safe temperature by forming the heating element of a flexible material having a high temperature coefficient of resistance, low thermal capacitance and high thermal conductivity. Preferably, the temperature coefficient of resistance of the material forming the heater filament is greater than 0.

US Patent:

6485430, Nov 26, 2002

Filed:

Feb 21, 1996

Appl. No.:

08/603550

Inventors:

Michael D. Quinn - Plano TX
Mark L. Yelderman - Plano TX

Assignee:

Edwards LifeSciences Corporation - Irvine CA

International Classification:

A61B 500

US Classification:

600505, 600526

Abstract:

A thermodilution catheter having a heating filament which is fabricated so as to be thin and flexible enough to avoid contact with the patients blood. The heating filament is either inserted in a preformed catheter lumen, incorporated into a wall of the catheter body itself, or wrapped around the catheter body wall and surrounded by an external sheath. Generally, the covering of the heating filament is minimally thin so as to allow the heat from the heating filament to be transferred to the surrounding blood and to minimally increase the overall cross-sectional area. Since the heating filament does not directly touch the patients blood, the outer surface may be made smooth so as to prevent inducement of blood clots. In addition, the heating filament may be maintained at a safe temperature by forming the heating element of a flexible material having a high temperature coefficient of resistance, low thermal capacitance and high thermal conductivity. Preferably, the temperature coefficient of resistance of the material forming the heater filament is greater than 0.

US Patent:

7254946, Aug 14, 2007

Filed:

Apr 12, 1995

Appl. No.:

08/420503

Inventors:

Michael D. Quinn - Plano TX, US
Mark L. Yelderman - Plano TX, US

Assignee:

Edwards Lifesciences Corporation - Irvine CA

International Classification:

A61B 5/02

US Classification:

60505, 600526

Abstract:

A thermodilution catheter having a heating filament which is fabricated so as to be thin and flexible enough to avoid contact with the patient's blood. The heating filament is either inserted in a preformed catheter lumen, incorporated into a wall of the catheter body itself, or wrapped around the catheter body wall and surrounded by an external sheath. Generally, the covering of the heating filament is minimally thin so as to allow the heat from the heating filament to be transferred to the surrounding blood and to minimally increase the overall cross-sectional area. Since the heating filament does not directly touch the patient's blood, the outer surface may be made smooth so as to prevent inducement of blood clots. In addition, the heating filament may be maintained at a safe temperature by forming the heating element of a flexible material having a high temperature coefficient of resistance, low thermal capacitance and high thermal conductivity. Preferably, the temperature coefficient of resistance of the material forming the heater filament is greater than 0.

US Patent:

60366540, Mar 14, 2000

Filed:

Sep 23, 1994

Appl. No.:

8/311477

Inventors:

Michael D. Quinn - Plano TX
Jaime Siman - Santa Ana CA
Mark L. Yelderman - Plano TX

Assignee:

Baxter International Inc. - Deerfield IL

International Classification:

A61B 502

US Classification:

600526

Abstract:

A multi-lumen catheter capable of measuring cardiac output continuously, mixed venous oxygen saturation as well as other hemodynamic parameters. The catheter is also capable of undertaking therapeutic operations such as drug infusion and cardiac pacing. The catheter includes optical fibers for coupling to an external oximeter, an injectate port and thermistor for bolus thermodilution measurements, a heating element for inputting a heat signal and for coupling to an external processor for continuously measuring cardiac output, and a distal lumen for measuring pressure, withdrawing blood, guidewire passage or drug infusion. In a preferred embodiment, the catheter includes a novel lumen configuration permitting an additional infusion lumen for either fast drug infusion or cardiac pacing.

US Patent:

58579761, Jan 12, 1999

Filed:

Jun 7, 1995

Appl. No.:

8/485125

Inventors:

Michael D. Quinn - Plano TX
Mark L. Yelderman - Plano TX

Assignee:

Baxter International Inc. - Deerfield IL

International Classification:

A61B 500

US Classification:

600506

Abstract:

A thermodilution catheter having a heating filament which is fabricated so as to be thin and flexible enough to avoid contact with the patient's blood. The heating filament is either inserted in a preformed catheter lumen, incorporated into a wall of the catheter body itself, or wrapped around the catheter body wall and surrounded by an external sheath. Generally, the covering of the heating filament is minimally thin so as to allow the heat from the heating filament to be transferred to the surrounding blood and to minimally increase the overall cross-sectional area. Since the heating filament does not directly touch the patient's blood, the outer surface may be made smooth so as to prevent inducement of blood clots. In addition, the heating filament may be maintained at a safe temperature by forming the heating element of a flexible material having a high temperature coefficient of resistance, low thermal capacitance and high thermal conductivity. Preferably, the temperature coefficient of resistance of the material forming the heater filament is greater than 0. 001. OMEGA. /. OMEGA. -. degree. C.

US Patent:

51464144, Sep 8, 1992

Filed:

Apr 18, 1990

Appl. No.:

7/510897

Inventors:

Russel McKown - Dallas TX
Mark Yelderman - Plano TX
Michael Quinn - Plano TX

Assignee:

Interflo Medical, Inc. - Plano TX

International Classification:

G01F 168

US Classification:

364510

Abstract:

Method and apparatus for adapting the volumetric flow rate measurement system taught by Yelderman in U. S. Pat. No. 4,507,974 to clinical environments by reducing the effects of physiological noise. Signal processing techniques are used to characterize the background noise power spectrum of the system under test so that the effect of noise aberrations on the measured data may be eliminated and so that the predominant periodicities of the background noise spectra may be avoided. The invention further cross-correlates the input data of the system with the corresponding ouput data of the system to determine weighting values for each input frequency so that data collected at noisy frequencies is discounted. Low frequency noise or drift is also removed from the output signal by fitting the average of the output data to a quadratic function which is then subtracted from the original output signal, point by point. Finally, the processed data is fit to a lagged normal normal distribution curve in the frequency domain to solve for the parameters necessary to mathematically model the transfer function of the system.

US Patent:

55884385, Dec 31, 1996

Filed:

Jun 7, 1995

Appl. No.:

8/473738

Inventors:

Russell C. McKown - Dallas TX
Michael D. Quinn - Plano TX
Mark L. Yelderman - Plano TX

Assignee:

Interflo Medical, Inc. - Plano TX

International Classification:

A61B 500

US Classification:

128692

Abstract:

A system for keeping the surface temperature of an electric resistance-type heater element in a thermodilution catheter within safe physiological limits includes, in the preferred embodiment, a heater element core temperature monitor, a monitor for monitoring the power that is supplied to the heater element, and a surface temperature calculator for calculating the surface temperature of the heater element based on the core temperature, supplied power, and information representing the characteristics of the particular catheter under anticipated clinical conditions. A second aspect of the invention involves a system for determining the supply of power to the heater element based on the core temperature of the heater element. A third aspect of the invention involves a system readiness test for determining, in vivo, that the thermodilution catheter system is properly calibrated before the system is operational. Methods of operation for each of the above-referenced aspects of the invention are also disclosed.