Patent ID: 11896351
Assignee: HONG KONG APPLIED SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE CO., LTD
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 15:
16. A periodic micro-movement detector comprising:
a fiber-optic cable having an inner core that carries light, a cladding layer around the inner core to reflect light back into the inner core, and an outer coating, wherein a diameter of the inner core is at least 50% of a diameter of the cladding layer around in the inner core;
a sensor matt having a planar mesh layer and the fiber-optic cable arranged in a planar pattern on the planar mesh layer and circled from inside to outside in a first radial ring group in a pair of radial ring groups, and circled from outside to inside in a second radial ring group in the pair of radial ring groups;
a light source coupled to drive an input light into a first end of the fiber-optic cable;
an optical receiver that senses changes in intensity of received light that is received by the optical receiver from a second end of the fiber-optic cable after the input light passes through the pair of radial ring groups;
a plurality of openings in the planar mesh layer;
wherein when pressure is applied by a moving body, the planar mesh layer presses upon the fiber-optic cable in the pair of radial ring groups, wherein a first portion of the fiber-optic cable bends partially into the plurality of openings and a second portion of the fiber-optic cable flexes against the planar mesh layer to vary attenuation of light passing through the fiber-optic cable;
an Analog-to-Digital Converter (ADC) that converts electrical signals from the optical receiver to digital values; and
a processing unit that performs Daubechies dB5 wavelet decomposition on the digital values to generate intermediate values that include detail coefficients and approximation coefficients;
wherein the processing unit performs reconstruction on the detail coefficients to generate a reconstructed dB5 level-4 detail waveform;
wherein the processing unit performs reconstruction on the approximation coefficients to generate a reconstructed dB5 level-6 approximation waveform;
wherein a heart rate is extracted from peaks in the reconstructed dB5 level-4 detail waveform;
wherein a respiration rate is extracted from peaks in the reconstructed dB5 level-6 approximation waveform;
wherein the processing unit performs Daubechies dB5 wavelet decomposition on the digital values to generate intermediate value that include detail coefficients and approximation coefficients;
wherein the processing unit performs reconstruction on the detail coefficients to generate the reconstructed dB5 level-4 detail waveform;
wherein the processing unit preforms reconstruction on the approximation coefficients to generate the reconstructed dB5 level-6 approximation waveform;
wherein the heart rate is extracted from peaks in the reconstructed dB5 level-4 detail waveform;
wherein the respiration rate is extracted from peaks in the reconstructed dB5 level-6 approximation wavefront;
wherein the digital values are convoluted with a dB5 scaling function and downsampled to generate a plurality of level-1 approximation coefficients;
wherein the plurality of level-1 approximation coefficients are convoluted with the dB5 scaling function and downsampled to generate a plurality of level-2 approximation coefficients;
wherein the plurality of level-2 approximation coefficients are convoluted with the dB5 scaling function and downsampled to generate a plurality of level-3 approximation coefficients;
wherein the plurality of level-3 approximation coefficients are convoluted with the dB5 scaling function and downsampled to generate a plurality of level-4 approximation coefficients.