Calibration system and method for pressure monitoring

• US 20060036184A1
• Filed: 08/12/2005
• Published: 02/16/2006
• Est. Priority Date: 08/12/2004
• Status: Abandoned Application

• Current Assignee: Edwards Lifesciences Corporation
• Original Assignee: Edwards Lifesciences Corporation
• Inventors: McKeown, Morgan T., Tenzer, Nathan J.
• Application Number:
  US11/202,601
• Publication Number:
  US 20060036184A1
• Time in Patent Office: Days
• US Class Current: 600/485
• CPC Class Codes: A61B 2560/0257 using atmospheric pressure
• CPC Class Codes: A61B 2560/0261 using hydrostatic pressure
• CPC Class Codes: A61B 5/02 Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure

Abstract

A calibration system for pressure monitoring including a sensor positioned at a sensor location on or in a patient'"'"'s body, a first pressure transducer positioned at a reference location remote from the sensor location to receive a signal from the sensor and to generate a first pressure signal, a calibration device positioned along a plane that is substantially coincident with a chamber or cavity (e.g., a heart chamber) of the patient to measure a reference pressure signal that represents a difference in pressure between the position of the calibration device and the reference location, a second pressure transducer positioned at the reference location remote from the sensor location to receive the reference pressure signal from the calibration device and to generate a calibration pressure signal, and an electronic device to produce an actual pressure signal using the first and calibration pressure signals.

Claims

1. A calibration system for pressure monitoring comprising:

a sensor positioned at a sensor location on or in a patient'"'"'s body;

a first pressure transducer positioned at a reference location remote from the sensor location to receive a signal from the sensor and to generate a first pressure signal;

a calibration device positioned along a plane that is substantially coincident with a cavity of the patient to measure a reference pressure signal that represents a difference in pressure between the position of the calibration device and the reference location;

a second pressure transducer positioned at the reference location remote from the sensor location to receive the reference pressure signal from the calibration device and to generate a calibration pressure signal; and

an electronic device to produce an actual pressure signal using the first and calibration pressure signals.

2. The calibration system of claim 1 wherein the sensor is selected from a group consisting of a catheter, a finger cuff, a fluid column, an invasive pressure device, a non-invasive pressure device, a piezoelectric device, a pneumatic device, and a pressure cuff.

3. The calibration system of claim 1 wherein the calibration device is a fluid column.

4. The calibration system of claim 3 wherein the fluid column has a first end that is isolated with a hydrophobic barrier and has a second end that is coupled to the second pressure transducer.

5. The calibration system of claim 1 wherein the first pressure transducer and the second pressure transducer are positioned along the same horizontal plane.

8. The calibration system of claim 1 further comprising a monitor to display the actual pressure signal.

9. The calibration system of claim 1 wherein the cavity is a heart cavity or chamber.

6. The calibration system of claim I wherein the electronic device is a differential circuit.

7. The calibration system of claim I wherein the electronic device is a processor.

10. A calibration system for pressure monitoring comprising:

a sensor positioned at a sensor location on or in a patient'"'"'s body;

a pressure transducer positioned at a reference location remote from the sensor location to receive a signal from the sensor and to generate a pressure signal;

a fluid column positioned adjacent to a patient'"'"'s heart to measure a reference pressure signal that represents a difference in pressure between the position of the fluid column and the reference location;

a calibration pressure transducer positioned at the reference location remote from the sensor location to receive the reference pressure signal from the fluid column and to generate a calibration pressure signal; and

an electronic device to produce an actual pressure signal using the pressure signal and the calibration pressure signal.

11. The calibration system of claim 10 wherein the sensor is selected from a group consisting of a catheter, a finger cuff, a fluid column, an invasive pressure device, a non-invasive pressure device, a piezoelectric device, a pneumatic device, and a pressure cuff.

12. The calibration system of claim 10 wherein the fluid column has a first end that is isolated with a hydrophobic barrier and has a second end that is coupled to the calibration pressure transducer.

13. The calibration system of claim 10 wherein the pressure transducer and the calibration pressure transducer are positioned along the same horizontal plane.

14. The calibration system of claim 10 wherein the electronic device is a differential circuit.

15. The calibration system of claim 10 wherein the electronic device is a processor.

16. A method of pressure monitoring comprising:

receiving a signal from a sensor;

generating a pressure signal using the signal;

receiving a reference pressure signal from a calibration device;

generating a calibration pressure signal using the reference pressure signal; and

producing an actual pressure signal using the pressure signal and the calibration pressure signal.

17. The method of claim 16 further comprising attaching the sensor to a patient.

18. The method of claim 17 further comprising attaching the calibration device adjacent to the heart of the patient.

19. The method of claim 16 wherein the sensor is selected from a group consisting of a catheter, a finger cuff, a fluid column, an invasive pressure device, a non-invasive pressure device, a piezoelectric device, a pneumatic device, and a pressure cuff.

20. The method of claim 16 wherein the calibration device is a fluid column.