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Fluid dose flow and coagulation sensor for medical instrument

  • US 5,686,659 A
  • Filed: 06/07/1995
  • Issued: 11/11/1997
  • Est. Priority Date: 08/31/1993
  • Status: Expired due to Term
First Claim
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1. A method of determining whether a fluid sample applied to a surface is a sample of a more readily flowable first fluid or a sample of a less readily flowable second fluid, the method comprising the steps of irradiating the surface at a first point, detecting the radiation from the first point, determining from the detected radiation when the sample has reached the first point, irradiating the surface at a second point downstream in the flow path of the fluid sample from the first point, detecting the radiation from the second point, determining from the detected radiation when the sample has reached the second point, establishing a threshold time, and comparing the time between when the sample is determined to have reached the first point and when the sample is determined to have reached the second point to the threshold time to determine whether the sample is a sample of the first fluid or a sample of the second fluid.

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