Method for monitoring blood gas tension and pH from outside the body
System for the measurement of the content of a gas in blood, in particular the oxygen saturation of blood
Method and apparatus for measuring thickness of fat using infrared light
Hematocrit and oxygen saturation blood analyzer
User-wearable hemoglobinometer for measuring the metabolic condition of a subject
Apparatus for measuring the change in the concentration of a pigment in blood Patent #: 5190040
ApplicationNo. 928120 filed on 08/12/1992
US Classes:600/479, Cardiovascular testing356/41, Oximeters600/323, Oxygen saturation, e.g., oximeter600/364Blood gas
ExaminersPrimary: Sykes, Angela D.
Attorney, Agent or Firm
Foreign Patent References
International ClassA61B 005/00
Foreign Application Priority Data1991-08-12 CH
AbstractA system for measuring the saturation of at least one gas in blood has a sensor which is, intended to be placed on a living body. Light is emitted from the sensor and into the body at a light radiating zone. The sensor has a plurality of light receiving zones, serving to receive light backscattered in the body, which zones are at various distances from the light radiating zone. Light receiving means are also present, in order to measure the intensities of the light backscattered from the body and reaching the sensor in the various light receiving zones. The measuring system also has electronic circuitry, which upon measurement, based on a predetermined criterion, selects one evaluation zone from among the light receiving zones and evaluate the portion of the light detected in the evaluation range that varies periodically over time at the rate of the pulse frequency in order to detect at least one gas saturation of blood, in particular the oxygen saturation of blood.