Device and method for the continuous non-invasive measurement of blood pressure

• US 9,615,756 B2
• Filed: 10/31/2012
• Issued: 04/11/2017
• Est. Priority Date: 10/31/2012
• Status: Active Grant

• Current Assignee: CNSystems Medizintechnik AG, Masimo Corporation
• Original Assignee: CNSystems Medizintechnik AG, Lidco Group, PLC
• Inventors: Mills, Eric, O'Brien, Terence Kevin, Fortin, Jrgen, Maier, Katja
• Primary Examiner(s): Berhanu, Etsub
• Application Number:
  US13/664,670
• Publication Number:
  US 20140121546A1
• Time in Patent Office: 1,623 Days
• Field of Search: 600481, 600485, 600486, 600488, 600490, 600491, 600492, 600493, 600494, 600495, 600500-505
• 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, the device being configured to be communicatively connected to a first blood pressure measurement device and to a second blood pressure measurement device, the device comprising:

a controller configured to

monitor a first blood pressure measurement based on a first blood pressure signal received from the first blood pressure measurement device;

calculate a med-dia-ratio using the first blood pressure signal only, the med-dia-ratio being based on a mean arterial pressure of the first blood pressure signal, a diastolic pressure of the first blood pressure signal, and a systolic pressure of the first blood pressure signal;

initiate acquiring a second blood pressure measurement based on a second blood pressure signal from the second blood pressure measurement device if the med-dia-ratio exceeds a predetermined threshold;

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 more than a predetermined amount; and

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.

2. The device according to claim 1, wherein the acquisition of the second blood pressure measurement is initiated if the med-dia-ratio falls below 21 percent or if the med-dia-ratio exceeds 51 percent.

3. The device according to claim 1, 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.

4. The device according to claim 1, further comprising an arm cuff or a finger cuff.

5. The device according to claim 1, wherein the med-dia-ratio (MD) is:

6. A method for monitoring blood pressure, the method being performed in a device that is communicatively connected to a first blood pressure measurement device and a second blood pressure measurement device, the method comprising:

monitoring a first blood pressure measurement based on a first blood pressure signal received from the first blood pressure measurement device;

calculating a med-dia-ratio using the first blood pressure signal only, the med-dia-ratio being based on a mean arterial pressure of the first blood pressure signal, a diastolic pressure of the first blood pressure signal, and a systolic pressure of the first blood pressure signal;

initiating acquiring a second blood pressure measurement based on a second blood pressure signal from the second blood pressure measurement device if the med-dia-ratio exceeds a predetermined threshold;

re-calibrating 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 more than a predetermined amount; and

inhibiting 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.