Chinese pulse wave measuring device and use method thereof

A pulse wave measuring device for pulse diagnosis, configured to measure a vascular radial displacement pulse wave of an arterial blood vessel at a test area of a subject, the pulse wave measuring device comprising:

• an airbag having a transparent window and a contact part, wherein the contact part is configured to contact a skin of the test area of the subject;
• a pressure control module configured to control an internal pressure of the airbag;
• a displacement sensing module comprising a photoelectric displacement sensor, the displacement sensing module configured to obtain a displacement signal indicative of the vascular radial displacement pulse wave of the arterial blood vessel through the transparent window of the airbag, wherein a measurement resolution of the displacement sensing module is below 50 μm;
• and
• a computer communicatively connected to the pressure control module and the displacement sensing module, wherein the computer is configured to:
• (a) control the pressure control module to progressively vary the internal pressure of the airbag over a range from an initial pressure value to an end pressure value while the displacement sensing module obtains the displacement signal;
• (b) determine a pulse-taking depth at which an amplitude of the vascular radial displacement pulse wave is maximum;
• and
• (c) control the pressure control module to adjust the depression depth of the airbag to the pulse-taking depth and maintain the depression depth of the airbag at the pulse-taking depth, so as to acquire the vascular radial displacement pulse wave for pulse diagnosis.

A method for identifying a target measurement position for pulse diagnosis, the method comprising:

• (a) controlling a scanning module to move a point-type displacement sensor along a predefined scanning path across a test area;
• (b) obtaining displacement signals at a plurality of spatial coordinates sequentially as the point-type displacement sensor moves along the predefined scanning path;
• (c) recording and storing the displacement signals corresponding to each of the plurality of spatial coordinates in a memory;
• (d) comparing, by a computer, amplitudes of the stored displacement signals to identify a maximum amplitude;
• and (e) automatically returning the point-type displacement sensor to a coordinate exhibiting the maximum amplitude to perform pulse wave measurement.

A method for automatically determining a pulse-taking depth for pulse diagnosis, the method comprising:

• (a) controlling, by a computer, a pressure control module to gradually vary an internal pressure of an airbag while a displacement sensing module monitors vascular radial displacement with a resolution sufficient to detect vessel wall motion at a target position;
• (b) processing the displacement signals to generate a pressure-displacement relationship and determine a maximum vessel wall excursion corresponding to the internal pressure;
• and
• (c) automatically locking a pulse-taking pressure corresponding to the maximum vessel wall excursion to acquire a vascular radial displacement pulse wave for pulse diagnosis.

A method for automatically determining a pulse-taking depth using a point-type sensor, the method comprising:

• (a) positioning a point-type displacement sensor at a target measurement position aligned with an arterial blood vessel;
• (b) controlling, by a computer, a pressure control module to mechanically depress an airbag against the target measurement position to gradually vary a contact pressure, while the point-type displacement sensor measures vascular radial displacement at the target measurement position, and processing the measured displacement signals to generate a pressure-displacement relationship between the contact pressure and the vascular radial displacement;
• (c) identifying, by the computer, a maximum vessel wall excursion based on the correlation;
• and
• (d) automatically locking a depression depth or a pulse-taking pressure of the airbag corresponding to the maximum vessel wall excursion for pulse diagnosis.

A method for multi-point pulse diagnosis using a point-type sensor, the method comprising:

• (a) controlling a scanning module to move a point-type displacement sensor across a test area to obtain displacement signals from a plurality of positions;
• (b) identifying a plurality of peak amplitude coordinates among the plurality of positions and calculating a regression trajectory (or a locus) based on the peak amplitude coordinates to define a longitudinal axis of an arterial blood vessel;
• (c) automatically scanning along the defined longitudinal axis to detect a distribution of amplitudes;
• and
• (d) identifying a plurality of measurement sites by locating local maximum amplitudes encountered during the scan along the defined longitudinal axis.

A pulse diagnosis apparatus comprising:

• a displacement sensing module configured to obtain displacement signals from a plurality of spatial coordinates;
• a pressure control module configured to control a pressure applied to a test area via an airbag;
• and a processor configured to:
• process the displacement signals to generate a spatial amplitude distribution;
• identify a target measurement position corresponding to a maximum amplitude;
• and determine an optimal pulse-taking pressure based on a pressure-displacement relationship derived from the displacement signals.