A method for measuring
blood pressure, pulse and
vascular compliance without invading a vascular cavity is provided. The
blood flow of a vessel is blocked by using an
artery clamp, a
voltage-variable
resistor-containing probe of a pressure
transducer is implanted between the
muscle layer and the
inner membrane of the vessel at the distal end to the heart, followed by biogum sealing; or the
voltage-variable
resistor probe is closely attached to the outer membrane of the vessel, and then the probe and the vessel are fixed together inside a rigid cylindrical cover. When the
artery clamp is released, the pressure inside the vascular cavity rises and is transferred to the
voltage-variable
resistor probe, resulting in the change in resistance, the resistance change is converted into a current change that is processed by a computer to produce a continuously-recorded
blood pressure change, and simultaneously the computer calculates pulses according to the peak distance of the
blood pressure and records the change in pulse. The cylindrical cover is provided thereon with a tension
transducer that converts a change of vessel displacement into a change of resistance and then a change of vessel displacement again, representative of the change in vascular volume, and calculates continuously-varying
vascular compliance. The invention doesn't block the
blood flow at the distal end of the vessel to avoid the influence on
blood supply to the dominant organs of the vessel to be detected.