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We present a real-time blood coagulation monitoring by using an externally vibrated, self-sensing piezoresistive microcantilever sensor for disposable point-of-care coagulation device. As the piezoresistive microcantilever was immersed in the sample solution, the measurement was performed in a vibration at fixed frequency and fixed amplitude. During the blood coagulation reaction, the viscosity of...
We report a microelectromechanical systems contour-mode film bulk acoustic resonator (C-FBAR) to monitor in-vitro whole blood coagulation in real time. The C-FBAR has a suspended ring made of piezoelectric aluminum nitride excited in the radial-extensional mode. It operates at its resonant frequency of 150 MHz and possesses a quality factor of 77 in citrated human blood. The C-FBAR is characterized...
We report a MEMS contour-mode film bulk acoustic resonator (C-FBAR) to monitor whole blood coagulation in-vitro in real time. The C-FBAR has a suspended ring of piezoelectric aluminum nitride excited in the radial-extensional mode. It operates at its resonant frequency of 150 MHz and possesses a quality factor (Q) of 140 in water. The C-FBAR is characterized using aqueous glycerine solutions showing...
We report on a microfabricated silicon ultrasonic horn-driven microprobes with polysilicon strain-gauges and integrated Pt-based immersion depth sensors for fluid viscosity measurement. Non-linear flexural vibration induced in the microprobes by the silicon horn actuated at its longitudinal resonance, is monitored and its damping is used to estimate fluid viscosity. Vibration damping in ethylene glycol...
Mechanical circulatory support, as well as cardiopulmonary bypass, requires the blood to interface with an artificial surface. This interaction activates the blood, which in turn tends to form clots. Some geometry, such as the junctions, can facilitate blood coagulation. Fluid dynamic simulations show areas where velocity tends to zero after a bifurcation. The proposed contribution deals with the...
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