BLOOD PRESSURE ALGORITHM

• US 20080234589A1
• Filed: 03/20/2008
• Published: 09/25/2008
• Est. Priority Date: 03/20/2007
• Status: Active Grant

• Current Assignee: Welch Allyn Incorporated
• Original Assignee: Tiba Medical, Inc. (Mortara Instruments Inc.)
• Inventors: Riobo Aboy, Pedro Mateo
• Granted Patent: US 7,927,283 B2
• Time in Patent Office: Days
• US Class Current: 600/490
• CPC Class Codes: A61B 5/02225 using the oscillometric method
• CPC Class Codes: A61B 5/0225 the pressure being controlled by electric signals, e.g. derived from Korotkoff sounds

Abstract

A apparatus and method for non-invasively measuring blood pressure. Cuff pressure and oscillometric signals are generated. The signals are conditioned by a plurality of linear filters to remove artifacts and local trends. Rank-order filters are applied to the conditioned oscillometric signal to detect upper and lower envelops. The systolic blood pressure and diastolic blood pressure are calculated using a plurality of multidimensional threshold vectors.

Claims

1. A method of measuring noninvasive blood pressure from an oscillometric signal and cuff pressure signal, the method comprising:

applying a plurality of linear filters to enhance the oscillometric signal and the cuff pressure signal;

applying a plurality of rank-order filters to the oscillometric signal; and

calculating systolic blood pressure and diastolic blood pressure using a plurality of multidimensional threshold vectors.

2. A method as recited in claim 1, wherein the threshold vectors depend on the mean arterial pressure.

3. A method as recited in claim 1, wherein the threshold vectors depend on the arm circumference.

4. A method as recited in claim 1, wherein the threshold vectors depend on the heart rate.

5. A method as recited in claim 1, wherein the method is implemented in firmware or software as means for determining blood pressure in a noninvasive blood pressure apparatus.