| 摘要 |
A pulsed blood flow is simulated with the aid of the oscillating rotation of a non-magnetic, electrically conductive rotor (4) in the sample (2), achieved by supplying a stator (5) around the container (1) with a first sinusoidal current which is amplitude-modulated with a second sinusoidal current. The frequency of the second current is varied over an interval in order to vary the angular velocity of the rotor oscillations. Phase differences between the second sinusoidal current and the rotor oscillations are measured in order to determine shear velocities during the interval. The phase difference at a specific shear velocity represents a measure of the viscoelasticity of the blood sample. Independent claims are also included for: (1) a second measurement method similar to the one described above, except that amplitude differences are measured instead of phase differences, and the amplitude difference at a specific shear velocity represents a measure of the viscosity of the blood sample; (2) measuring devices used to carry out these methods; (3) the containers used in combination with these measuring devices, comprising an evacuated transparent syringe containing a non-magnetic, electrically conductive rotor, into which the sample is sucked. |
