Search

CN-121987182-A - Exhaled breath collecting and detecting device

CN121987182ACN 121987182 ACN121987182 ACN 121987182ACN-121987182-A

Abstract

The invention discloses an expired air collection and detection device which comprises an expired air hood, wherein the expired air hood is connected with a filter, the filter is connected with a drying device, the drying device is connected with a gas collecting device, the gas collecting device is connected with a VOCs detection system, an automatic gas inlet switching device is arranged between the filter and the drying device and comprises an electric switching valve, a gas inlet, a first gas outlet and a second gas outlet are arranged on the electric switching valve, a carbon dioxide concentration sensor is arranged in the gas inlet, and the carbon dioxide concentration sensor is connected with a control center.

Inventors

  • XU YUANSHENG

Assignees

  • 杭州市第一人民医院(西湖大学附属杭州市第一人民医院)

Dates

Publication Date
20260508
Application Date
20251230

Claims (8)

  1. 1. The exhaled breath collection and detection device is characterized by comprising an exhaled breath cover (1), wherein the exhaled breath cover (1) is connected with a filter (2), the filter (2) is connected with a drying device, the drying device is connected with a gas collecting device (4), the gas collecting device (4) is connected with a VOCs detection system (5), an automatic gas inlet switching device (3) is arranged between the filter (2) and the drying device, the automatic gas inlet switching device (3) comprises an electric switching valve (31), the electric switching valve (31) is provided with a gas inlet (32), a first gas outlet (33) and a second gas outlet (34), the gas inlet (32) is connected with the filter (2), the first gas outlet (33) is communicated with the external environment, the second gas outlet (34) is connected with the drying device, a carbon dioxide concentration sensor is arranged in the gas inlet (32), the carbon dioxide concentration sensor is connected with a control center, the carbon dioxide concentration sensor monitors the carbon dioxide concentration at the gas inlet (32) in real time and transmits data to the control center, when the carbon dioxide concentration is lower than a preset electric control center, the electric switching valve (31) is communicated with the first gas outlet (33) and the second gas outlet (34) is communicated with the external environment, the collection of exhaled air begins.
  2. 2. The expired air collection and detection device according to claim 1, wherein the drying device comprises a first dryer (6) and a second dryer (7), an outlet end of the first dryer (6) is connected with a main pipeline (61), a first three-way valve (62) is arranged on the main pipeline (61), a first humidity sensor is arranged between the first three-way valve (62) and the first dryer (6), the first humidity sensor is connected with a control center, the first three-way valve (62) is provided with an air inlet end and two air outlet ends, the air inlet end of the first three-way valve (62) is connected with the first dryer (6), one air outlet end of the first three-way valve (62) is connected with the air collecting device (4), the other air outlet end of the first three-way valve (62) is connected with a standby pipeline (71), the standby pipeline (71) and the main pipeline (61) are connected into the air collecting device (4) in parallel, the standby pipeline (71) is provided with the second dryer (7), the first humidity sensor detects the humidity of air in real time, the first humidity sensor is connected with the control center, the first humidity sensor is directly connected with the first three-way valve (4) through the first dryer (6), and then directly enters the first three-way valve (7) after the first dryer (6) and the first humidity sensor (7) enters the first three-way valve (6).
  3. 3. The device for collecting and detecting the exhaled breath according to claim 2, wherein a second three-way valve (72) is arranged between the second dryer (7) and the gas collecting device (4), a through pipeline (10) is arranged between the first three-way valve (62) and the second three-way valve (72), the second three-way valve (72) is provided with two air inlet ends and one air outlet end, one air inlet end of the second three-way valve (72) is connected with the second dryer (7), the other air inlet end of the second three-way valve is connected with the through pipeline (10), the air outlet end of the second three-way valve (72) is connected with the gas collecting device (4), a second humidity sensor is arranged between the second dryer (7) and the second three-way valve (72), the second humidity sensor is connected with a control center, and when the humidity detected by the second humidity sensor is larger than a preset value, the control center gives an alarm to suspend the collecting operation of the exhaled breath.
  4. 4. The exhaled breath collecting and detecting device according to claim 1, wherein the gas collecting device (4) comprises a constant temperature box (41), a gas collecting bag (42) is arranged in the constant temperature box (41), and the constant temperature box (41) keeps the temperature in the box stable through a temperature sensor and a hot air circulating system.
  5. 5. The device for collecting and detecting exhaled air as claimed in claim 4, wherein an end switch is arranged in the constant temperature box (41), and the air collecting bag (42) is inflated after a certain volume of exhaled air is collected, and the end switch is triggered to prompt the completion of gas collection.
  6. 6. The exhaled breath collection and detection device according to claim 4, wherein the squeeze plates (43) are arranged on two sides of the incubator (41), the air collecting bag (42) is located between the two squeeze plates (43), the squeeze plates (43) are connected with squeeze brackets (44), and the squeeze brackets (44) are driven to move by the driving device.
  7. 7. The exhaled breath collection and detection device according to claim 6, wherein the driving device is a rotating motor, racks (45) are arranged on the extrusion brackets (44), the racks (45) of the two extrusion brackets (44) are meshed with two sides of the driving gear (46), and when the rotating motor rotates, the two extrusion brackets (44) are driven to be close to each other to extrude the air collecting bag (42).
  8. 8. The exhaled breath collection and detection device according to claim 1, wherein the VOCs detection system (5) comprises a detection mechanism, and an enrichment module is arranged between the detection mechanism and the air collecting device (4).

Description

Exhaled breath collecting and detecting device Technical Field The invention relates to the technical field of exhaled breath collection and detection, in particular to an exhaled breath collection and detection device. Background Exhaled breath detection is a noninvasive and convenient disease diagnosis technology, has been widely focused in clinical diagnosis in recent years, and early screening and auxiliary diagnosis of various diseases can be realized by analyzing Volatile Organic Compounds (VOCs) in exhaled breath of a human body. The existing exhaled air collection and detection device generally carries out detection through direct blowing, the method acquires samples by directly collecting all exhaled air of a subject, the collected air is not preprocessed, dead space air and alveolar air in the collected air cannot be effectively distinguished, the dead space air is used as a part which does not participate in air exchange in an air passage, the concentration of VOCs (volatile organic compounds) and the alveolar air are obviously different, if the VOCs are incorporated into a detection sample, the accuracy of a final detection result is reduced, in the detection process, the change of parameters such as humidity, inflow speed and temperature of the exhaled air also affects the sensitivity and accuracy of detection, and the direct blowing detection method cannot exclude the influence of the parameters such as inflow speed and temperature. Disclosure of Invention The invention aims to solve the problems in the prior art, and provides an expired air collecting and detecting device which can solve the problems. In order to achieve the above purpose, the invention provides an expired air collection and detection device, which comprises an expired air hood, wherein the expired air hood is connected with a filter, the filter is connected with a drying device, the drying device is connected with a gas collecting device, the gas collecting device is connected with a VOCs detection system, an automatic gas inlet switching device is arranged between the filter and the drying device, the automatic gas inlet switching device comprises an electric switching valve, an air inlet, a first air outlet and a second air outlet are arranged on the electric switching valve, the air inlet is connected with the filter, the first air outlet is communicated with the external environment, the second air outlet is connected with the drying device, a carbon dioxide concentration sensor is arranged in the air inlet, the carbon dioxide concentration sensor is connected with a control center, the carbon dioxide concentration sensor monitors the carbon dioxide concentration at the air inlet in real time and sends data to the control center, when the carbon dioxide concentration is lower than a preset value, the control center controls the electric switching valve to be communicated with the first air outlet, the electric switching valve is communicated with the second air outlet when the carbon dioxide concentration reaches the preset value, and the control center controls the electric switching valve to be communicated with the second air outlet, and the expired air starts to collect. Preferably, the drying device comprises a first dryer and a second dryer, the outlet end of the first dryer is connected with a main pipeline, a first three-way valve is arranged on the main pipeline, a first humidity sensor is arranged between the first three-way valve and the first dryer, the first humidity sensor is connected with a control center, the first three-way valve is provided with an air inlet end and two air outlet ends, the air inlet end of the first three-way valve is connected with the first dryer, one air outlet end of the first three-way valve is connected with an air collecting device, the other air outlet end of the first three-way valve is connected with a standby pipeline, the standby pipeline and the main pipeline are connected into the air collecting device in parallel, the standby pipeline is provided with a second dryer, the first humidity sensor detects the humidity of gas in real time, when the humidity is lower than a preset value, the gas directly enters the air collecting device after passing through the first dryer, when the humidity is higher than the preset value, the first three-way valve is switched to the standby pipeline, and the gas sequentially passes through the first dryer and the second dryer and then enters the air collecting device. Preferably, a second three-way valve is arranged between the second dryer and the gas collecting device, a straight-through pipeline is arranged between the first three-way valve and the second three-way valve, the second three-way valve is provided with two air inlet ends and one air outlet end, one air inlet end of the second three-way valve is connected with the second dryer, the other air inlet end of the second three-way valve is connected with the straight-through pipeli