Pressure measuring system with ultrasonic wave
AssigneeFujitsu Limited
InventorHirohide Miwa
Life of this patent
Estimating the term…
Abstract
A system for measuring from the outside of a living body the pressure within the heart or the pressure of any portion which does not allow a measurement by the direct insertion of a pressure measuring sensor. This system provides a method of measuring the pressure of the object by generating fine bubbles through cavitation, applying a low frequency ultrasonic wave to the medium, and then detecting the bubbles which are generated with a system for detecting the high or low frequency harmonics due to the bubbles or a higher frequency ultrasonic wave applied to the medium.
Claims38
An ultrasonic pressure measuring system for measuring a pressure of a measuring area in a measuring medium, comprising:
- means for generating low frequency ultrasonic waves in the measuring medium, said low frequency ultrasonic waves generating fine bubbles which create high and low harmonic ultrasonic waves, in the measuring medium, the measuring medium having a critical pressure of bubble formation,
- means for generating high frequency ultrasonic waves in the measuring medium;
- means, operatively connected to the means for generating the low frequency ultrasonic waves and the means for generating the high frequency ultrasonic waves, for detecting the generation of the fine bubbles, and
- means, operatively connected to the means for detecting the generation of the fine bubbles, for measuring the pressure in the measuring area of the measuring medium in accordance with a relationship between the measuring medium pressure, the low frequency ultrasonic wave pressure, and the critical pressure of bubble formation.
An ultrasonic pressure measuring system for measuring a pressure of a measuring area in a measuring medium, comprising:
- means for generating low frequency ultrasonic waves in the measuring medium, said low frequency ultrasonic waves generating fine bubbles, said fine bubbles creating high and low harmonic ultrasonic waves in the measuring medium, the measuring medium having a critical pressure of bubble formation,
- means, operatively connected to the means for generating the low frequency ultrasonic waves, for detecting the generation of the fine bubbles, and
- means, operatively connected to the means for detecting the generation of the fine bubbles, for measuring the pressure in the measuring area of the measuring medium in accordance with a relationship between the measuring medium pressure, the low frequency ultrasonic wave pressure, and the critical pressure of bubble formation.
Dependencies are inferred from the claim text.