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
Display system with mounting assemblies and associated methods
Factor IXa crystals, related complexes and methods
Real-time RSL monitoring in a web-based application
Stage drive method and stage unit, exposure apparatus, and device manufacturing method
Measuring apparatus for measuring a physical property of a sample
Medical diagnosis, therapy, and prognosis system for invoked events and methods thereof
Aluminum galvanic cell
  Randomly Featured Patents
Hinge assembly
File marking device
Serrated leech flaps for sails
Barbecue grill
Process controls for molecular assay
Display configuration
Waterbox calendering
Asynchronous messaging based system for publishing and accessing content and accessing applications on a network with mobile devices
Adjustable fluid control pouch
Driver circuit for a large capacity switching element