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Multi-stream data collection system for noninvasive measurement of blood constituents

  • US 9,277,880 B2
  • Filed: 07/01/2010
  • Issued: 03/08/2016
  • Est. Priority Date: 07/03/2008
  • Status: Active Grant
First Claim
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1. A noninvasive sensor configured to produce a signal responsive to light attenuated by tissue at a measurement site on a patient, the sensor comprising:

  • an optical source configured to emit optical radiation onto said tissue at said measurement site;

    at least one photodetector configured to detect the optical radiation from said optical source after attenuation by said tissue of said patient and output at least one respective signal stream responsive to said detected optical radiation;

    a housing positioning said optical source and said at least one photodetector with respect to said measurement site, said housing forming a clip sensor and including;

    a first heat insulating shell housing said optical source, said first heat insulating shell including;

    a top surface;

    a bottom surface opposite said top surface;

    a cavity extending from said top surface to said bottom surface, wherein said top surface includes a curved surface at a periphery of said cavity;

    a heat sink comprising heat conducting material and disposed at least partially within said cavity, said heat sink having an outer convex surface that aligns with said curved surface of said periphery of said top surface to form an uninterrupted top convex surface of said housing wherein heat produced by said optical source is dissipated via said heat sink through said cavity; and

    one or more curved fins that form said outer convex surface of said heat sink, wherein a thickness of said outer convex surface of said heat sink is less than a length of said top convex surface of said housing;

    a second shell hinged to the first heat insulating shell and housing said photodetector;

    a spring disposed between and urging together the shells; and

    a thermistor operably associated with said housing and configured to output a temperature signal responsive to a temperature of said measurement site.

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