Apparatus and method for remotely monitoring and altering brain waves
Method for measuring physiological parameter
Apparatus and method for measuring lung water content
Circuit for separating one type signal component from another Patent #: 4638808
ApplicationNo. 213783 filed on 06/30/1988
US Classes:600/407, Detecting nuclear, electromagnetic, or ultrasonic radiation600/430, With microwave carrier signal600/484, Detecting respiratory condition600/534Detecting body movement attending breathing
ExaminersPrimary: Howell, Kyle L.
Assistant: Pfaffle, K. M.
Attorney, Agent or Firm
International ClassesA61B 005/02
AbstractAn apparatus for measuring simultaneous physiological parameters such as heart rate and respiration without physically connecting electrodes or other sensors to the body. A beam of frequency modulated continuous wave radio frequency energy is directed towards the body of a subject. The reflected signal contains phase information representing the movement of the surface of the body, from which respiration and heartbeat information can be obtained. The reflected phase modulated energy is received and demodulated by the apparatus using synchronous quadrature detection. The quadrature signals so obtained are then signal processed to obtain the heartbeat and respiratory information of interest.