NONINVASIVE BLOOD PRESSURE MEASUREMENT AND MONITORING DEVICE
First Claim
1. A noninvasive blood pressure measuring and monitoring device for continuously measuring and monitoring blood pressure in a blood vessel of a wrist of a person, comprising:
- a. a dielectric, flexible substrate,b. an antenna formed upon said dielectric, flexible substrate; and
c. at least one surface acoustic wave sensor attached to said dielectric, flexible substrate and electrically connected to said antenna,whereby said pressure sensor senses the pulsation of said wrist artery of said person and said pulsation data is transmitted wirelessly to a reader system.
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Abstract
Measurement of blood pressure is one of the most common procedures done in a clinical and an ambulatory environment. It is usually done with a sphygmomanometer, where an inflatable cuff is attached to the arm of a patient and the systolic and diastolic pressures are determined, typically by listening to the Korotkoff sounds. Although this method is over 100 years old and widely used, it is well known that it has severe shortcomings.
The present invention covers a novel device and method to continuously measure blood pressure using a noninvasive approach. A surface acoustic wave (SAW) pressure sensor is placed on a flexible substrate and placed on the wrist of a patient. This blood pressure sensing device communicates wirelessly with a monitor that is placed several meters away. The monitor can also be a wristwatch worn by the patient. The invention further encompasses a calibration procedure to convert the relative blood pressure values into absolute values.
The main application for this novel device and method is in an intensive care environment where continuous monitoring of blood pressure on critically ill patients is important. Since the proposed method is inexpensive it can also be used by patients at home or even by healthy people (e.g. athletes). The reader system consists of an antenna and a standard computer (e.g. laptop) with signal processing software.
19 Citations
13 Claims
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1. A noninvasive blood pressure measuring and monitoring device for continuously measuring and monitoring blood pressure in a blood vessel of a wrist of a person, comprising:
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a. a dielectric, flexible substrate, b. an antenna formed upon said dielectric, flexible substrate; and c. at least one surface acoustic wave sensor attached to said dielectric, flexible substrate and electrically connected to said antenna, whereby said pressure sensor senses the pulsation of said wrist artery of said person and said pulsation data is transmitted wirelessly to a reader system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13)
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11. A method for making a blood pressure measuring and monitoring device for continuously and noninvasively measuring and monitoring blood pressure in a blood vessel, the method including the steps of:
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a. Fabricating a surface acoustic wave sensor b. Fabricating a transducer antenna and embedding said antenna in a dielectric, flexible substrate.
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Specification