DEVICE AND METHOD FOR THE CONTINUOUS NON-INVASIVE MEASUREMENT OF BLOOD PRESSURE

• US 20140121546A1
• Filed: 10/31/2012
• Published: 05/01/2014
• Est. Priority Date: 10/31/2012
• Status: Active Grant

• Current Assignee: CNSystems Medizintechnik AG, Masimo Corporation
• Original Assignee: CNSystems Medizintechnik AG, Lidco Group, PLC (Masimo Corporation)
• Inventors: Mills, Eric, O'Brien, Terence Kevin, Fortin, Jrgen, Maier, Katja
• Granted Patent: US 9,615,756 B2
• Time in Patent Office: Days
• US Class Current: 600/490
• CPC Class Codes: A61B 2560/0223 of calibration, e.g. protocols for calibrating sensors
• CPC Class Codes: A61B 5/022 by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
• CPC Class Codes: A61B 5/0225 the pressure being controlled by electric signals, e.g. derived from Korotkoff sounds
• CPC Class Codes: A61B 5/6824 Arm or wrist
• CPC Class Codes: A61B 5/6826 Finger

Abstract

A device and method for use in monitoring blood pressure. The device comprises a controller configured to monitor a first blood pressure measurement based on a first blood pressure signal. The controller is configured to initiate acquiring a second blood pressure measurement based on a second blood pressure signal if the first blood pressure measurement exceeds a predetermined threshold. The decision to initiate acquiring the second blood pressure measurement is based on only one blood pressure measurement.

Claims

1. A device for use in monitoring blood pressure comprising:

a controller configured to monitor a first blood pressure measurement based on a first blood pressure signal, the controller being further configured to;

initiate acquiring a second blood pressure measurement based on a second blood pressure signal if the first blood pressure measurement exceeds a predetermined threshold;

wherein a decision to initiate acquiring the second blood pressure measurement is based on only one blood pressure measurement.

2. A device according to claim 1, wherein the controller is further configured to initiate acquiring the second blood pressure measurement based on pulse pressure calculated based on the first blood pressure signal.

3. A device according to claim 2, wherein the controller is further configured to initiate acquiring the second blood pressure measurement if the pulse pressure falls below 15 mmHG and/or to initiate acquiring the second blood pressure measurement if the pulse pressure exceeds 150 mmHG.

4. A device according to claim 1, wherein the controller is further configured to initiate acquiring the second blood pressure measurement if a change in pulse pressure over a period of time exceeds a predetermined threshold.

5. A device according to claim 4, wherein the period of time is a fixed time period.

6. A device according to claim 5, wherein the controller is further configured to initiate acquiring the second blood pressure measurement if the pulse pressure decreases by more than 50% over the period of time and/or if the pulse pressure increases by more than 100% over the period of time.

7. A device according to claim 6, wherein the period of time is 90 seconds.

8. A device according to claim 4, wherein the period of time is the period of time since a predetermined point in time.

9. A device according to claim 8, wherein the controller is further configured to initiate acquiring the second blood pressure measurement if the pulse pressure increases by more than 60% since a previous second blood pressure measurement or re-calibration and/or if the pulse pressure decreases by more than 150% since a previous second blood pressure measurement or re-calibration.

10. A device according to claim 1, wherein the controller is further configured to initiate acquiring a second blood pressure measurement based on med-dia-ratio calculated based on the first blood pressure signal.

11. A device according to claim 10, wherein the controller is further configured to initiate acquiring the second blood pressure measurement if the med-dia-ratio exceeds a predetermined threshold.

12. A device according to claim 11, wherein the controller is further configured to initiate acquiring the second blood pressure measurement if the med-dia-ratio falls below 21% and/or to initiate acquiring the second blood pressure measurement if the med-dia-ratio exceeds 51%.

13. A device according to claim 1, wherein the controller is further configured to re-calibrate the first blood pressure measurement based on the second blood pressure measurement if the first blood pressure measurement differs from the second blood pressure measurement by a predetermined amount.

14. A device according to claim 13, wherein the controller is configured to inhibit initiating acquiring a second blood pressure measurement if a second blood pressure measurement has been taken during a predetermined preceding period of time and if the first blood pressure measurement was not recalibrated in view of the second blood pressure measurement.

15. A device according to claim 13, wherein the controller is further configured to inhibit initiating acquiring a second blood pressure measurement based on a specific predetermined threshold being exceeded, if, during a predetermined preceding period of time, a second blood pressure measurement has been taken based on said predetermined threshold being exceeded and the first blood pressure measurement was not recalibrated.

16. A device according to claim 1, further comprising an arm cuff and/or a finger cuff.

17. A haemodynamic monitor comprising a device according to claim 1.

18. A method of monitoring blood pressure comprising:

receiving a first blood pressure signal, monitoring a first blood pressure measurement based on the first blood pressure signal and initiating acquiring a second blood pressure measurement based on a second blood pressure signal if the first blood pressure measurement exceeds a predetermined threshold, wherein the decision to initiate acquiring the second blood pressure measurement is based on only one blood pressure measurement.