Applications of Vehicular Trac Theory to Blood Rheology

A buffered probing device includes a cantilever-shaped probe having a micro-needle at its tip, and an electric circuit that applies electrical signals between the micro-needle and a probe target to which an electrical stimulus is applied. In one embodiment of the invention, the probe includes a suspension member having a spring constant per unit length that is less than that of a probe body. The micro-needle is formed on the suspension member. In another embodiment of the invention, the electric circuit applies oscillations at a specific frequency to the probe, such that the micro-needle is always or intermittently in contact with the surface of the probe target. As a result, wear of the needle is greatly reduced.