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
Multi-radio coexistence
System, method and program recording medium for supply capacity estimation
Actuator, actuator structure and method of manufacturing actuator
System and method for identifying a target signal in an optical transport network frame structure
High electron mobility transistor and manufacturing method thereof
Golf club cover
Markers of acute myeloid leukemia stem cells
  Randomly Featured Patents
Projection optical system and exposure apparatus
Paper wrinkle sign monitoring device, paper wrinkle sign monitoring method, and computer readable medium
Display screen with user interface
System and method for a digital projection advertising display
Service mapping method of enterprise application modeling and development for multi-tier service environments
Lightweight casket
Tool drive assembly and related tool drive linkage, tool work implement assembly and tool
Magnetic head slider and method of production thereof
Roller cover support for paint roller frame
Electromagnetic diesel fuel injector