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 13:
14. A dual-vital-sign monitor comprising:
a sensor matt having a mesh layer, a fiber-optic cable arranged in a coil pattern, and a top cover layer that presses the fiber-optic cable into the mesh layer to bend the fiber-optic cable to modulate light in the fiber-optic cable;
a light source that generates a light into a first end of the fiber-optic cable;
a light sensor that generates a sensor output that indicates an intensity of light received by the light sensor from a second end of the fiber-optic cable after the light is modulated by the sensor matt;
an Analog-to-Digital Converter (ADC) that converts the sensor output to digital intensity values; and
a processing unit that performs a Daubechies dB wavelet and scaling function convolution with the digital intensity values;
the processing unit also generating a BallistoCardioGram (BCG) waveform by reconstructing a level 4 detail waveform from level 4 detail coefficients generated by the Daubechies dB wavelet and scaling function convolution with the digital intensity values;
the processing unit also generating a respiration waveform by reconstructing a level 6 approximation waveform from level 6 approximation coefficients that are also generated by the Daubechies dB wavelet and scaling function convolution with the digital intensity values;
wherein the processing unit performs Daubechies dB5 wavelet decomposition on the digital intensity 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 reinstructed 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 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 waveform;
wherein the digital intensity values are convoluted with a dB5 scaling function and downsampled to generate a plurality of level-1 approximation coefficient;
wherein the plurality of level-2 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;
whereby both the respiration waveform and the BCG waveform are generated through the Daubechies dB5 wavelet and scaling function convolution on the digital intensity values that are modulated by the sensor matt.