CN201263678Y

CN201263678Y - Novel device for analyzing infrared end-tidal carbon dioxide concentration

Info

Publication number: CN201263678Y
Application number: CNU200820074194XU
Authority: CN
Inventors: 高原
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-03-27
Filing date: 2008-03-27
Publication date: 2009-07-01
Anticipated expiration: 2018-03-27

Abstract

The utility model relates to an improvement on an ultrared expiration end carbon dioxide concentration analyzing device. In a carbon dioxide analyzing system consisting of an electromagnetic valve (1), an ultrared light source (2), a light source circuit (7), an air chamber (3), a light filter (5), a detector (6), a magnifying circuit (6) and a microprocessor circuit (8), a gas buffer (10) and a negative pressure pump (11), the utility model adopts the scheme that a temperature sensor (9) is arranged in the air chamber; a semiconductor refrigeration apparatus (4) is installed outside the air chamber; and a pulse light source circuit (7) drives the ultrared light source (2). The utility model can greatly improve the real-time performance and stability of the measurement and improve the accuracy of the monitoring and provides the novel ultrared expiration end carbon dioxide concentration analyzing device.

Description

New infrared end expiratorycarbon dioxide analytical equipment

Technical field:

This utility model relates to a kind of new infrared end expiratorycarbon dioxide analytical equipment, belongs to the biomedical engineering technology field.

Background technology:

Belong to Non-Invasive monitoring method with infrared principles monitoring patient exhales end gas concentration lwevel, the ventilatory function that not only can monitor patient also can reflect its circulatory function and lung blood circumstance, has become clinical monitoring means commonly used at present.Its clinical meaning has: the monitoring a variety of causes causes the patient's of respiratory insufficiency ventilatory function; The variation of carbon dioxide output in monitoring circulatory function and the body; Understand the variation of alveolar dead space amount and pulmonary blood flow volume; Can regulate ventilation according to monitoring when patient's general anesthesia or use respirator avoids hypoventilation or excessively causes high or low carbonmonoxydemia; In time find the mechanical breakdown of respirator.

At present domestic clinical used infrared principles is monitored the equipment of end expiratorycarbon dioxide, all exist the measurement error of bringing because of temperature drift, equipment self and other unstable factors, and common measure of getting is to use thermistor compensation, because the curve of critesistor and infrared detector is different, and discreteness is very big, is difficult to reach the effect of full remuneration in actual applications.

Defectives such as in addition, the infrared carbon dioxide monitoring device of producing mostly adopts mechanical type chopper modulated infrared light source at present, has movable part, adjusts trouble, and resistance to vibration is poor, and reliability is low.

The utility model content:

The purpose of this utility model be at above-mentioned deficiency provide a kind of can dual-temperature the single light source, the new infrared end expiratorycarbon dioxide analytical method and the device of single air chamber of compensation, and simple in structure, debugging is convenient, cost is lower, measure infrared accurately end expiratorycarbon dioxide analytical equipment.

The technical solution of the utility model is: new infrared end expiratorycarbon dioxide analytical equipment, it is characterized in that: the carboloy dioxide analysis system that forms by light source (2), circuit of light sources (7), single air chamber (3), optical filter (5), Infrared Detectors (6), amplifying circuit and microcontroller circuit (8), gas cushion (10) and negative pressure pump (11) outside electromagnetic valve (1), the Shan Hong, temperature sensor (9) is housed in air chamber, semiconductor cooling device (4) is installed outside air chamber, drives infrared light supply (2) by light-pulse generator circuit (7).During work, patient expired gas enters moisture trap under the effect of negative pressure pump (11), again by the laggard air inlet chamber of electromagnetic valve (1) (3), discharges from negative pressure pump (11) through gas cushion (10) from the gas that air chamber (3) comes out.Circuit of light sources (7) drives the pulsed light after infrared light supply (2) makes it send modulation, is detected device (6) through air chamber (3), optical filter (5) and receives, and its peak value of narrowband optical optical filter of detector (6) top is 4.26um.Electromagnetic valve (1) is the zeroing electromagnetic valve, under the state that is not having adhesive, link to each other with patient expired pipeline, this moment, new infrared end expiratorycarbon dioxide analytical equipment was analyzed the carbon dioxide of patient's expired gas, under the state of electromagnetic valve 1, link to each other with zero carbon dioxide in adhesive, the zero carbon dioxide values that collect this moment is used for the zeroing of new infrared end expiratorycarbon dioxide analytical equipment and calculates air-breathing end and the reference value of end-expiratory carbon dioxide value as with reference to value.The temperature signal that amplifying circuit and microcontroller circuit (8) are gathered temperature sensor (9) amplifies, control semiconductor cooling device (4) after the sampling, calculation process, make air chamber (3) be in 25 ℃ temperature constant state, simultaneously amplifying circuit and microcontroller circuit (8) amplifies, sample the detected carbon dioxide signals of detector (6) and export accurate, stable end-expiratory carbon dioxide value after the temperature value after the processing carries out software compensation, calculation process.

This utility model can carry out temperature-compensating to the carbon dioxide of measuring greatly, and improves real-time, stability, the raising monitoring accuracy of measuring.

Description of drawings:

Accompanying drawing is this utility model structural representation

Specific implementation method:

Electromagnetic valve described in the utility model (1) is the zeroing electromagnetic valve, and the zero carbon dioxide values that collects is used for the zeroing of new infrared end expiratorycarbon dioxide analytical equipment and calculates air-breathing end and the reference value of end-expiratory carbon dioxide value as with reference to value.

Air chamber of the present utility model (3) is to process with superduralumin, overall dimensions 45mm x 35mm x 25mm, air cell size Φ 3 x 18, polishing in the air chamber, temperature sensors of high precision LM35 is adopted in temperature sensor (9), and temperature sensor (9) and detector (6) are installed on the preamplification board, are installed in the air chamber (3) again, semiconductor cooling device (4) is installed in outside the air chamber (3), and other part connects according to position shown in the accompanying drawing 1 respectively.

During work, patient expired gas enters moisture trap under the effect of negative pressure pump (11), again by the laggard air inlet chamber of electromagnetic valve (1) (3), discharges from negative pressure pump (11) through gas cushion (10) from the gas that air chamber (3) comes out.Circuit of light sources (7) drives the pulsed light after infrared light supply (2) makes it send modulation, is detected device (6) through air chamber (3) and receives.

Claims

1, a kind of new infrared end expiratorycarbon dioxide analytical equipment, it is characterized in that: for by electromagnetic valve (1), light source outside the Shan Hong (2), circuit of light sources (7), single air chamber (3), optical filter (5), detector (6), amplifying circuit and microcontroller circuit (8), the carboloy dioxide analysis system that gas cushion (10) and negative pressure pump (11) are formed, temperature sensor (9) is housed in air chamber, semiconductor cooling device (4) is installed outside air chamber, send into microprocessor after amplifying circuit amplifies temperature signal and carry out analog digital conversion, sampling and computing, microprocessor is exported a control signal then, the control semiconductor cooler, being it is controlled at temperature constant state about 25 ℃ to air chamber, and microprocessor further carries out the temperature software compensation by temperature value to the carbon dioxide signals that collects simultaneously.

2, new infrared end expiratorycarbon dioxide analytical equipment as claimed in claim 1 is characterized in that: described infrared light supply (2) is a light-pulse generator, and its circuit of light sources (7) is the light-pulse generator circuit.

3, new infrared end expiratorycarbon dioxide analytical equipment as claimed in claim 1, it is characterized in that: described electromagnetic valve (1) is the zeroing electromagnetic valve, the zero carbon dioxide values that collects is used for the zeroing of new infrared end expiratorycarbon dioxide analytical equipment and calculates air-breathing end and the reference value of end-expiratory carbon dioxide value as with reference to value.