CN-122016052-A - Non-contact vital sign detection system and device based on optical sensing for emergency ICU

CN122016052ACN 122016052 ACN122016052 ACN 122016052ACN-122016052-A

Abstract

The invention relates to the technical field of body temperature or heat measurement, in particular to a non-contact vital sign detection system and device based on optical sensing for an emergency ICU, wherein the system introduces active thermal stimulation, spectral infrared thermal response analysis, real-time environmental factor compensation and physiological thermal model fusion technology, so that the accurate, stable and specific non-contact monitoring of core body temperature and endogenous metabolic heat of a patient is realized, the heat coupling obstacle is effectively overcome, the internal and external heat is distinguished, and the monitoring stability and accuracy are improved.

Inventors

GOU FANG
TAO KAI
FAN YUNFEI
ZHANG CHUNTAO

Assignees

中国人民解放军西部战区总医院

Dates

Publication Date: 20260512
Application Date: 20260107

Claims (7)

1. Non-contact vital sign detecting system of emergency call ICU based on optical sensing, its characterized in that includes: The non-contact optical sensing module is used for performing active thermal stimulation on a preset monitoring area and synchronously collecting multispectral infrared thermal radiation response data, visible light or near infrared image data and distance information; The environment context sensing module is used for monitoring key physical parameters in the emergency ICU environment in real time; the signal acquisition and preprocessing unit is used for receiving original electric signals from the non-contact optical sensing module and the environment context sensing module, and digitizing, filtering, amplifying and extracting primary characteristics; The data fusion and dynamic thermal modeling unit is used for integrating data, and realizing the compensation of environmental interference, the inference of deep physiological heat and the accurate estimation of core body temperature by establishing and solving a physical/physiological thermal model; the display and alarm unit is used for displaying the core body temperature and the metabolic heat generation change trend of the patient in real time; And the control and communication unit is used for coordinating the work of all the modules and realizing the safe data exchange with an external system.
2. The system of claim 1, wherein the non-contact optical sensing module comprises: The active thermal stimulation sub-module is used for emitting heat radiation energy which is accurately regulated and controlled to the preset monitoring area so as to induce transient thermal response, and is provided with a group of infrared radiation emitter arrays which are composed of a plurality of high-power narrow-band emitting infrared light emitting diodes, wherein the emitter arrays focus light spots to the preset monitoring area through an optical lens group, and the adjustable range of the light spot diameter is 2mm to 10mm; The infrared spectrum detection sub-module is used for collecting transient multispectral infrared radiation data of the preset monitoring area at different time points before active thermal stimulation, during the stimulation and after the stimulation in real time, the infrared spectrum detection sub-module is provided with a group of infrared detector arrays which comprise at least two infrared detectors with different spectral response characteristics, and the collecting frame rate of the infrared detector arrays can be adjusted within the range of 50Hz to 500Hz.
3. The system of claim 1, wherein the data fusion and dynamic thermal modeling unit comprises: The environment interference compensation submodule adopts a self-adaptive Kalman filtering algorithm to introduce the environment parameters as state variables and update the heat balance equation of the body surface of a patient in real time so as to separate pure physiological source heat radiation from measured values influenced by the environment, and the output of the environment interference compensation submodule is an environment corrected body surface net heat radiation value; The thermal response analysis submodule receives transient multispectral infrared radiation data provided by the spectral infrared detection submodule and the stimulation parameters of the active thermal stimulation submodule, and analyzes the dynamic response of tissues to active thermal stimulation through a reverse thermal conduction algorithm and a multilayer tissue thermal conduction model; the physiological heat deducing sub-module receives the deep tissue thermal parameters provided by the thermal response analysis sub-module, and deduces the core body temperature and endogenous metabolic heat generation change of the patient by combining a patient-specific physiological heat model, wherein the physiological heat model is an improved type based on Penness physiological models, and the accuracy of the real-time core body temperature estimated value of the patient output by the physiological heat deducing sub-module is +/-0.2 ℃; and the motion compensation sub-module is used for detecting and quantifying the head or chest motion of a patient in real time through an image registration and feature tracking algorithm, and dynamically adjusting the monitoring areas of the spectrum infrared detection sub-module and the active thermal stimulation sub-module.
4. The system of claim 3, wherein the dynamic heat balance model is based on convective heat transfer of ambient temperature and local air flow velocity, radiative heat transfer based on background infrared radiation and ambient temperature, and evaporative heat transfer based on ambient humidity and patient perspiration; The inverse heat conduction algorithm utilizes finite element analysis to establish the multi-layer biological tissue heat conduction model, the multi-layer biological tissue heat conduction model comprises an epidermis layer, a dermis layer and a subcutaneous fat layer, and the density, specific heat capacity, heat conductivity coefficient and blood flow perfusion rate of each layer of tissue are considered, and the effective heat conductivity coefficient and blood flow perfusion rate of the deep tissue are reflected by carrying out parameter optimization on an actual measurement transient temperature curve by using a Levenberg-Marquardt algorithm.
5. The system of claim 1, wherein the environmental context awareness module comprises: The environment temperature sensor adopts a high-precision platinum resistance temperature sensor with the measurement range of-10 ℃ to 60 ℃ and the measurement precision of +/-0.1 ℃, the environment humidity sensor adopts a capacitance humidity sensor with the measurement range of 0% to 100% relative humidity and the measurement precision of +/-2% RH, the local air flow sensor adopts a hot wire type wind speed sensor with the measurement range of 0.05m/s to 5m/s and the measurement precision of +/-0.05 m/s, and the background infrared radiation sensor adopts a wide spectrum infrared thermopile detector with the spectral response range of 2 mu m to 20 mu m.
6. The non-contact vital sign detection device based on optical sensing for the emergency ICU is used for implementing the non-contact vital sign detection system according to any one of claims 1 to 5, and is characterized by comprising a mechanical arm, wherein the mechanical arm is provided with at least six rotary joints, the movement range of the mechanical arm can cover a patient monitoring area on an emergency ICU sickbed, and the non-contact optical sensing module is mounted on the mechanical arm.
7. The apparatus of claim 6, wherein the control system of the robotic arm cooperates with the motion compensation sub-module to adjust the pose and position of the non-contact optical sensing module in real time based on the patient's position and small movements.

Description

Non-contact vital sign detection system and device based on optical sensing for emergency ICU Technical Field The invention relates to the technical field of body temperature or heat measurement, in particular to a non-contact vital sign detection system and device based on optical sensing for an emergency ICU. Background The vital sign monitoring of an emergency Intensive Care Unit (ICU) patient aims at accurately acquiring physiological data of the patient in real time and provides objective basis for clinical diagnosis, treatment scheme formulation and prognosis evaluation, wherein the non-contact vital sign detection technology has become an important trend of research and application in the field by virtue of the advantages of non-invasiveness, cross infection risk reduction and comfort level improvement of the patient. In early application, the infrared thermal imaging technology successfully solves the problems that the traditional contact temperature measurement mode (such as mercury thermometer and electronic thermometer) is complex in operation and possibly causes discomfort and even cross infection risk of patients, and particularly, the infrared thermal imaging technology shows remarkable efficiency advantage when large-scale screening or preliminary evaluation of fever symptoms is performed. With the more stringent, fine and dynamic demands of emergency ICU scenes on vital sign monitoring, the above-mentioned non-contact temperature measurement technology based on pure infrared radiation reception or surface spectrum analysis gradually shows deep limitations in response to new challenges due to some inherent characteristics of the principle level. Disclosure of Invention The invention aims to provide a non-contact vital sign detection system and device based on optical sensing for an emergency ICU, which solve the technical problems that the non-contact monitoring result is inaccurate due to insufficient coupling of body surface temperature and core physiological heat information and difficult distinction of endogenous and exogenous heat in the prior art by introducing active thermal stimulation, multispectral infrared thermal response analysis, real-time environmental factor compensation and physiological thermal model fusion technology. In one aspect of the invention, there is provided an emergency ICU optical sensing-based non-contact vital sign detection system comprising: The non-contact optical sensing module is used for performing active thermal stimulation on a preset monitoring area and synchronously collecting multispectral infrared thermal radiation response data, visible light or near infrared image data and distance information; The environment context sensing module is used for monitoring key physical parameters in the emergency ICU environment in real time; the signal acquisition and preprocessing unit is used for receiving original electric signals from the non-contact optical sensing module and the environment context sensing module, and digitizing, filtering, amplifying and extracting primary characteristics; The data fusion and dynamic thermal modeling unit is used for integrating data, and realizing the compensation of environmental interference, the inference of deep physiological heat and the accurate estimation of core body temperature by establishing and solving a physical/physiological thermal model; the display and alarm unit is used for displaying the core body temperature and the metabolic heat generation change trend of the patient in real time; And the control and communication unit is used for coordinating the work of all the modules and realizing the safe data exchange with an external system. In some embodiments, the non-contact optical sensing module comprises: The active thermal stimulation sub-module is used for emitting heat radiation energy which is accurately regulated and controlled to the preset monitoring area so as to induce transient thermal response, and is provided with a group of infrared radiation emitter arrays which are composed of a plurality of high-power narrow-band emitting infrared light emitting diodes, wherein the emitter arrays focus light spots to the preset monitoring area through an optical lens group, and the adjustable range of the light spot diameter is 2mm to 10mm; The infrared spectrum detection sub-module is used for collecting transient multispectral infrared radiation data of the preset monitoring area at different time points before active thermal stimulation, during the stimulation and after the stimulation in real time, the infrared spectrum detection sub-module is provided with a group of infrared detector arrays which comprise at least two infrared detectors with different spectral response characteristics, and the collecting frame rate of the infrared detector arrays can be adjusted within the range of 50Hz to 500Hz. In some embodiments, the data fusion and dynamic thermal modeling unit comprises: The environment interfe