4 results about "Breath sampling" patented technology

The invention discloses a high-precision wide-range expiration detection device and method, which is applied to the technical field of expiration detection, and comprises an expiration sampling unit used for collecting an expiration sample; the gas analysis unit consists of a three-way valve, an analysis pump, an electrochemical sensor module and a filter; the control and calculation unit is used for controlling the three-way valve to perform quick switching of closing and opening according to the size of the real-time output signal when the ratio of the output signal to the saturation signal is greater than a preset threshold value, so that the expiration sample is mixed with the zero-point gas filtered by the filter before entering the electrochemical sensor module; the gas concentration in the expiration sample is calculated according to the proportion of the output signal, the sensitivity and the closing time of the three-way valve; the double clinical requirements for high precision and wide range of expiration detection are met.

The invention relates to the technical field of medical expiration detection equipment, in particular to a pressure zero point calibration and blowing judgment anti-interference method of an expiration detection device. The method comprises the following steps: under a non-blowing condition, sampling a pressure sensor for multiple times, calculating a mean value, and storing the mean value as a zero offset; when blowing judgment is carried out, gauge pressure or differential pressure is obtained by subtracting the zero offset from the reading of the pressure sensor, and first-order low-pass filtering is carried out on the gauge pressure or the differential pressure; when the filtered pressure exceeds a set threshold value, it is judged that blowing triggering is conducted; when the reading of the pressure sensor exceeds the reasonable interval, the filtering state is not updated, and the historical filtering value or the reference value is output, so that false triggering is avoided. By the adoption of the method, the influence of baseline deviation caused by assembly drift, temperature drift and gas path micro leakage on blowing judgment can be reduced, the false triggering risk caused by instantaneous noise or communication abnormity is reduced, and the method is suitable for various expiration sampling and detecting devices based on pressure triggering.

The present application relates to a rapid screening system and method for influenza based on detection of volatile organic compounds in exhaled breath, belonging to the field of medical detection. The system comprises a breath sampling module, a sensor array module and a data analysis module. The breath sampling module collects exhaled breath from a subject and performs drying, filtering and quantitative pretreatment. The sensor array module detects the types and concentrations of 11 characteristic volatile organic compounds such as heptanal and nonanal in the pretreated gas. The data analysis module has an artificial intelligence algorithm built-in, which determines whether the subject is infected with influenza virus based on the disease fingerprint characteristics of volatile organic compounds. The system also includes an operation guidance module with voice and light guidance, and can be in the form of a mobile trolley or a portable device. The system uses non-invasive breath detection, does not require blood sampling or nasopharyngeal swabbing, and can complete the screening process in 2-3 minutes. The system has a sensitivity of 92.7% or higher and a specificity of 94.0% or higher, and is suitable for rapid screening of large populations in schools, communities and other places, significantly reducing the risk of cross-infection, and achieving early detection, early diagnosis and early treatment of influenza.

The invention discloses an expiration sampling bag with an inner coating and a multi-layer covering film structure and a preparation method of the expiration sampling bag. The expiration sampling bag comprises a bag body and a gas inlet and outlet assembly, and the bag body is made of a multi-layer composite film material and sequentially comprises a double-function inner coating, an inner-layer base material film, a first bonding layer, a core blocking layer, a second bonding layer and an outer-layer protective film from inside to outside. The difunctional inner coating comprises an inorganic barrier bottom layer and an organic anti-adsorption surface layer, the core barrier layer is an aluminum foil layer, and a nano anchoring layer is arranged on the surface of the aluminum foil layer. The inorganic barrier bottom layer and the organic anti-adsorption surface layer are organically combined, so that the synergistic interaction of gas barrier and anti-adsorption functions is realized, the adsorption quantity of VOCs on the inner surface of the bag body can be effectively reduced, the stability of the concentration of a target analyte in an expiration sample is ensured, and the accuracy of an expiration detection result is improved.