Resources Contact Us Home
Method and apparatus for determining blood pressure

Image Number 4 for United States Patent #5551438.

A transducer assembly (12) is applied to the surface of the body beneath an inflatable cuff (10). Transducers (12c) are disposed upon a substrate (12a) and may include from one to some large number of transducers suitable for detecting an oscillation resulting from arterial blood flow within a partially occluded artery. Each transducer (12c) can be of large size, relative to an artery (16), to eliminate a requirement that the transducer be accurately placed over and maintained upon the artery. The substrate can be provided to have a surface with a radius of curvature selected to approximate a curvature of the extremity to which the transducer array is applied. The cuff pressure is increased to a level above the systolic pressure of the individual and then gradually reduced. Oscillations are sensed by one or more of the transducers as the cuff pressure is decreased. When the systolic pressure is reached, the sensed oscillations begin to increase in amplitude until they reach a maximum amplitude. The cuff pressure at the point of maximum amplitude is correlated with the Mean Arterial Pressure of the subject. Methods for accomplishing a sub-diastolic continuous measurement cycle and a Mean Arterial Pressure monitoring cycle are also provided.

  Recently Added Patents
System and method for order placement in an electronic trading environment
Method and system for calibrating laser profiling systems
Plants and seeds of hybrid corn variety CH450823
Managing a packet service call within mobile communications user equipment
Information processing apparatus capable of authentication processing with improved user convenience, control program for information processing apparatus, and recording medium having control
Carbonate and carbamate modified forms of glucocorticoids in combination with .beta..sub.2 adrenergic agonists
  Randomly Featured Patents
Adjustable foot-rest chair ring
Flameproofing resins for organic textiles from adduct polymers
Boltless bonnet assembly for gate valve
Fixture for the attachment of a guide rail to the body of a piece of furniture
Flexible barge
Control rod for boiling water reactor and method for manufacturing the same
Document fidelity with binary XML storage
Functional at speed test system for integrated circuits on undiced wafers
Method and apparatus for monitoring soil compaction
Difluorobenzonitriles and liquid-crystalline medium