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Fluid dose, flow and coagulation sensor for medical instrument

  • US 5,522,255 A
  • Filed: 08/31/1993
  • Issued: 06/04/1996
  • Est. Priority Date: 08/31/1993
  • Status: Expired due to Term
First Claim
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1. In combination, an instrument for determining a characteristic of a biological fluid or a control comprising a radiation-reflective surface, a first source for irradiating the surface, and a first detector for detecting radiation reflected from the surface, a heater comprising an electrically resistive foil for maintaining the biological fluid or control at a desired temperature, means for mounting the heater adjacent the surface, means for providing power to the heater and means for monitoring the surface temperature and for feeding the monitored temperature back to the means for providing power to the heater, the surface comprising a first radiation reflective surface of a tile, the tile further comprising a second surface opposite the first surface thereof, and means for mounting the electrically resistive foil to the second surface of the tile, and a cuvette for holding a sample of the biological fluid or control the characteristic of which is to be determined, the cuvette having two opposed walls substantially transparent to the source radiation and reflected radiation, the first source and first detector being disposed adjacent a first one of said two opposed walls and the radiation reflective surface being disposed adjacent a second of said two opposed walls.

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