Method and apparatus for determining the instantaneous arterial blood pressure Patent #: 4172450
ApplicationNo. 06/300745 filed on 09/10/1981
US Classes:600/483, Simultaneously detecting cardiovascular condition and diverse body condition600/485, Measuring pressure in heart or blood vessel600/492, Tester having plural occluders, or single occluder and separate pressurized pulse sensing cuff or cushion600/502, Pulse indicator600/503, Entire testing assembly supported on wristD24/165Sphygmomanometer
ExaminersPrimary: Apley, Richard J.
Assistant: Yanulis, George
Attorney, Agent or Firm
International ClassesA61B 5/022 (20060101)
A61B 5/0225 (20060101)
A61B 5/0235 (20060101)
F15C 3/14 (20060101)
F15C 3/00 (20060101)
Foreign Application Priority Data1980-09-12 NL
AbstractA device for the indirect, non-invasive and continuous measurement of blood pressure in a finger by using a photo-electric plethysmograph having a pressure cuff to be placed around the finger and to be filled with fluid, an associated light source and light detector, an electronic circuit, and an electric control valve having at least one fluid flapper-nozzle system, the cuff pressure being controlled by the plethysmographic signal in closed-loop operation such that the arterial volume is maintained on a pre-adjusted value and each deviation thereof due to changes in intra-arterial pressure is compensated immediately, whereby the control valve consists of a double fluid flapper-nozzle system in balance connection, whereby a single flapper member is positioned between the oppositely arranged nozzle openings of two nozzle members and alternately opens and closes these nozzle openings, one flapper-nozzle system being used in opposite sense, and one single chamber surrounding both nozzle openings being connected to the pressure cuff.