Method and apparatus for calculating blood pressure of an artery

• US 20030208127A1
• Filed: 05/16/2003
• Published: 11/06/2003
• Est. Priority Date: 11/09/1993
• Status: Abandoned Application

• Current Assignee: Medwave, Inc.
• Original Assignee: Medwave, Inc.
• Inventors: Thede, Roger C., Curran, Timothy G., Poliac, Marius O., Archibald, G. Kent, Danielson, Orland H.
• Application Number:
  US10/439,445
• Publication Number:
  US 20030208127A1
• Time in Patent Office: Days
• US Class Current: 600/494
• CPC Class Codes: A61B 2562/0247 Pressure sensors
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/02116 of pulse wave amplitude A61B5/02225 takes precedence
• CPC Class Codes: A61B 5/02141 Details of apparatus construction, e.g. pump units or housings therefor, cuff pressurising systems, arrangements of fluid conduits or circuits A61B5/02233, A61B5/0235 take precedence
• CPC Class Codes: A61B 5/02225 using the oscillometric method
• CPC Class Codes: A61B 5/02233 Occluders specially adapted therefor tourniquets A61B17/132
• CPC Class Codes: A61B 5/6843 Monitoring or controlling sensor contact pressure

Abstract

The present invention is a method for calculating blood pressure of an artery having a pulse. The method includes applying a varying pressure to the artery. Pressure waveforms are sensed to produce pressure waveform data. Waveform parameters are derived from the sensed pressure waveform data. Blood pressure is then determined using the derived parameters.

Claims

1. An apparatus for non-invasively measuring blood pressure of a radial artery, the apparatus comprising:

a sensor including a surface to contact skin over the radial artery, the sensor sensing waveform pressure data of the radial artery;

a wrist mount which extends to an opposite side of the wrist from the radial artery;

a hold down assembly that applies a variable pressure to the radial artery; and

a monitor interconnected with the sensor to derive systolic, diastolic or mean blood pressure based upon the sensed waveform data.

2. The apparatus of claim 1 wherein the monitor further comprises a display interconnected with the sensor to display the sensed waveform pressure data.

3. A non-invasive blood pressure monitoring system for measuring and displaying blood pressure within an underlying radial artery, the blood pressure monitoring system comprising:

a sensor including a surface for contacting skin over the radial artery wherein the sensor senses pressure waveform data of the radial artery;

a wrist assembly for positioning the sensor over the radial artery, the wrist assembly including a mounting portion which extends to an opposite side of the wrist from the radial artery; and

a hold down assembly to apply force to the sensor and thereby apply varying pressure to the radial artery.

4. The blood pressure monitoring system of claim 3, and further comprising a display for displaying the sensed pressure waveform data from the radial artery.

5. The blood pressure monitoring system of claim 3, and further comprising a monitor which determines systolic, diastolic or mean blood pressure based upon the sensed pressure waveform data.

6. The blood pressure monitoring system of claim 5 wherein the monitor derives waveform shape parameters from the pressure waveform data and the systolic, diastolic and mean blood pressure is determined based upon the waveform shape parameters.

7. A non-invasive blood pressure measurement system comprising:

a sensor including an area for being positioned over an underlying radial artery wherein the sensor senses pressure waveform data produced by the radial artery;

a hold down assembly for applying a force to the sensor to apply varying pressure against the radial artery; and

a monitor connected to the sensor for producing output signals corresponding to the sensed pressure waveform data, for deriving a plurality of waveform shape parameters using the sensed pressure waveform data and for determining a blood pressure value using the derived parameters.

8. A non-invasive blood pressure measurement system comprising:

a sensor including an area for being positioned over an underlying radial artery wherein the sensor senses pressure during a plurality of pulses in the radial artery;

a hold down assembly for applying a force to the sensor to apply varying pressure against the radial artery; and

a monitor connected to the sensor for deriving a blood pressure value based upon analysis of the sensed pressure representing at least one pressure waveform produced by one of the pulses.

9. An apparatus for determining blood pressure of a radial artery having a pulse, the apparatus comprising:

a wrist assembly including a hold down assembly for applying a varying pressure to the radial artery and a wrist mount extending to an opposite side of a wrist from the radial artery;

a sensor for sensing pressure waveform data produced by the radial artery, the sensor including a surface positioned upon skin over the radial artery; and

a monitor connected to the sensor for deriving parameters from the sensed pressure waveform data and determining a blood pressure value based upon the parameters.

10. The apparatus of claim 9 wherein the monitor further comprises a display for displaying the sensed pressure waveform data.

11. A non-invasive blood pressure monitoring device for determining blood pressure of an artery, the monitoring device comprising:

a hold down assembly for applying a varying pressure to the artery so that the artery exhibits a plurality of pressure waveforms;

a sensor for producing sensed pressure waveform data representing each of the plurality of pressure waveforms, the sensor including a surface positioned upon skin over the radial artery; and

a monitor connected to the sensor for deriving parameters from the sensed pressure waveform data and determining a blood pressure value based upon the parameters.

12. A non-invasive blood pressure measurement system comprising:

a hold down assembly for applying a varying pressure to the radial artery;

a sensor for sensing pressure from the artery over time to generate pressure data, the sensor including a surface positioned upon skin over the radial artery; and

a monitor connected to the sensor to determine a pressure value based upon an analysis of the pressure data.

13. An apparatus for monitoring pressure waveform data produced by a radial artery, the method comprising:

a hold down assembly for applying a varying pressure to the radial artery beginning with an initial pressure and ending with a final non-occluding pressure so that the radial artery exhibits a plurality of pressure waveforms;

a sensor for sensing pressure waveform data produced by the radial artery representing each of the plurality of pressure waveforms, wherein the final non-occluding pressure applied to the radial artery is determined based upon the pressure waveform data sensed while the varying pressure is applied to the radial artery and the sensor including an active area positioned upon skin over the radial artery; and

a monitor for displaying the pressure waveform data derived from a waveform produced at a selected hold down pressure.

14. A non-invasive blood pressure measurement system comprising:

a sensor including an area for being positioned over an underlying radial artery wherein the sensor senses pressure waveform data produced by the radial artery;

a hold sown assembly for applying a force to the sensor to apply varying pressure against the radial artery; and

a monitor connected to the sensor for displaying the pressure waveform data and pressure values based upon the pressure waveform data.

15. An apparatus for determining blood pressure of a radial artery having a pulse, the apparatus comprising:

a wrist assembly including a hold down assembly for applying a varying pressure to the radial artery and a wrist mount extending to an opposite side of a wrist from the radial artery;

a sensor for sensing pressure waveform data produced by the radial artery, the sensor including a surface positioned upon skin over the radial artery; and

a monitor connected to the sensor for deriving a blood pressure value from pressure waveform data.

16. A non-invasive blood pressure monitoring device for determining blood pressure of an artery, the monitoring device comprising:

a hold down assembly for applying a varying pressure to the artery so that the artery exhibits a plurality of pressure waveforms;

a sensor for producing sensed pressure waveform data representing each of the plurality of pressure waveforms, the sensor including a surface positioned upon skin over the radial artery; and

a monitor for displaying the pressure waveform data derived from a waveform produced at a selected hold down pressure.