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Apparatus for detecting a change of viscosity by measuring a relative slip, in particular for detecting the coagulation rate of blood

  • US 5,181,415 A
  • Filed: 07/18/1991
  • Issued: 01/26/1993
  • Est. Priority Date: 07/20/1990
  • Status: Expired due to Fees
First Claim
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1. An apparatus for detecting a change of viscosity of a fluid medium in time, comprising a drive element and a driven element having respective facing walls which define therebetween a chamber of calibrated volume adapted to receive a fluid sample, the driven element being driven in relative rotation by the drive element with a relative slip which depends on the viscosity of the fluid which provides coupling between the two elements and means for measuring the relative change of slip, wherein said measuring means comprise a magnetic means cooperating with a block of magnetic material for immobilizing the driven element until the moment when the coagulation causes the facing walls to adhere together with sufficient force to cause said driven element to be driven.

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