RAPID NON-INVASIVE BLOOD PRESSURE MEASURING DEVICE

• US 20110263990A1
• Filed: 05/27/2011
• Published: 10/27/2011
• Est. Priority Date: 06/26/1996
• Status: Abandoned Application

• Current Assignee: Masimo Corporation
• Original Assignee: Masimo Corporation
• Inventors: Sher, Mark Henry, Caro, Richard G., Flaherty, Bryan Patrick
• Application Number:
  US13/118,236
• Publication Number:
  US 20110263990A1
• Time in Patent Office: Days
• US Class Current: 600/485
• CPC Class Codes: A61B 5/02133 by using induced vibration of the blood vessel
• CPC Class Codes: A61B 5/022 by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers

Abstract

A measurement device for generating an arterial volume-indicative signal includes an exciter and a detector. The exciter is adapted to receive an oscillating signal and generate a pressure wave based at least in part on the oscillating signal on the artery at a measurement site on a patient. The pressure wave includes a frequency. The detector is placed sufficiently near the measurement site to detect a volumetric signal indicative of arterial volume of the patient.

Claims

1. A measurement device for determining blood pressure, the measurement device comprising:

an external pressure device configured to apply a first external pressure to an artery and subsequently apply a second external pressure to the artery, the first external pressure and the second external pressure being such that the artery experiences a range of transmural pressures; and

a processor, wherein the processor is configured to identify a first time when transmural pressure is approximately equal to zero and a second time when transmural pressure is approximately equal to zero.

2. The measurement device of claim 1, wherein the external pressure device comprises a cuff.

3. The measurement device of claim 1, wherein the applied second external pressure is greater than the applied first external pressure.

4. The measurement device of claim 1, wherein the applied first and second external pressures are between a systolic and diastolic arterial pressure.

5. The measurement device of claim 1, wherein the processor is configured to determine a first arterial pressure at the first time and a second arterial pressure at the second time.

6. The measurement device of claim 5, wherein the processor is configured calibrate a pressure-indicative signal using the first and second arterial pressures.

7. The measurement device of claim 5, further comprising a detector to produce a pressure-indicative signal, wherein the processor is further adapted to determine a user'"'"'s blood pressure based on the pressure-indicative signal and the first and second arterial pressures.

8. The measurement device of claim 7, wherein the detector comprises a tonometer.

9. The measurement device of claim 7, wherein the detector comprises a pressure wave velocity measurement system.

10. The measurement device of claim 5, wherein the processor is configured to determine a patient'"'"'s blood pressure based on a pressure-indicative signal received from a detector and the first and second arterial pressures.

11. The measurement device of claim 5, wherein the processor is configured to determine an offset of a pressure-indicative signal.

12. The measurement device of claim 5, wherein the processor is configured to scale a pressure-indicative signal.

13. The measurement device of claim 1, wherein the processor is adapted to identify a change in the viscoelastic properties of an artery.

14. The measurement device of claim 1, further comprising a first detector electrically connected to the processor to produce a signal indicative of arterial pressure and a second detector electrically connected to the processor to produce a signal indicative of an arterial volume.

15. The measurement device of claim 1, further comprising an exciter configured to perturb at least one of pressure and volume of a patient'"'"'s artery with an oscillating perturbation signal.

16. A method of determining arterial pressure, comprising:

applying a first external pressure to an artery, the first external pressure being such that the artery experiences a range of transmural pressures;

identifying a first time when transmural pressure is approximately equal to zero;

applying a second external pressure to the artery, the second external pressure being such that the artery experiences a range of transmural pressures; and

identifying a second time when transmural pressure is approximately equal to zero.

17. The method of claim 16, wherein the second external pressure is greater than the first external pressure.

18. The method of claim 16, wherein the first and second external pressures are between a systolic and diastolic arterial pressure.

19. The method of claim 16, further comprising determining a first arterial pressure at the first time and a second arterial pressure at the second time.

20. The method of claim 19, further comprising determining a patient'"'"'s blood pressure based on a pressure-indicative signal received from a detector and the first and second arterial pressures.