CN2315564Y - Detector for end carbon dioxide of expiration with automatic compensating function - Google Patents
Detector for end carbon dioxide of expiration with automatic compensating function Download PDFInfo
- Publication number
- CN2315564Y CN2315564Y CN 97249855 CN97249855U CN2315564Y CN 2315564 Y CN2315564 Y CN 2315564Y CN 97249855 CN97249855 CN 97249855 CN 97249855 U CN97249855 U CN 97249855U CN 2315564 Y CN2315564 Y CN 2315564Y
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- carbon dioxide
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- micro computer
- voltage stabilizer
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- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The utility model relates to a carbon dioxide detecting device in the end of expiration with the function of automatic compensation. The utility model is used for detecting carbon dioxide in the end of the expiration in the process of the operations of patients, comprising an electromagnetic valve, an infrared source, a gas chamber, an infrared detecting device and an amplifier. The utility model is characterized in that the carbon dioxide detecting device in the end of expiration is also provided with a micro computer, a digital to analog converter and an adjustable voltage stabilizer; two input ends of the micro computer are respectively connected with the output end of the amplifier and the electromagnetic valve; the output of the micro computer is connected with the input of the digital to analog converter; the output of the digital to analog converter is connected with the input of the adjustable voltage stabilizer; the output of the adjustable voltage stabilizer is directly connected with the filament of the infrared source. The utility model has the advantages of automatic tracking and compensation, simple circuits and convenient debugging.
Description
The utility model relates to detection, measurement or the record that medically is used for diagnostic purpose, particularly a kind of end-expiratory carbon dioxide detector with automatic compensation function.Be used for the detection of patient's surgical procedure end-expiratory carbon dioxide.
Press for the instrument that accurately to measure patient exhales end gas concentration lwevel in the surgical procedure clinically.Because the concentration of end-expiratory carbon dioxide has been represented patient from the airborne oxygen ability of taking the photograph, blood discharges carbon dioxide when lung obtains new fresh oxygen.If patient's end expiratorycarbon dioxide descends in surgical procedure, medical personnel must take corresponding measure to eliminate the factor that causes that end expiratorycarbon dioxide descends, usually, the decline of end expiratorycarbon dioxide means in the too much anesthetic input patient body.
The at present domestic clinical used infrared principles of utilizing detects the equipment of end expiratorycarbon dioxide, all exist the discreteness of Yin Wendu drift, equipment self and the measuring error that other labile factors are brought, and the common measure of taking is to use thermistor compensation, because the curve of thermistor and infrared detector is different, and discreteness is very big, is difficult to reach the effect of full remuneration in actual applications.
There is United States Patent (USP) 2204684 to adopt micro computers to record temperature drift amount again,, send demonstration after numerical value revised by the calculating of micro computer.This software computing compensation needs great deal of experiment data and experimental facilities, standard gas, and can not be corresponding one by one to the discreteness of infrared detector, needs every instrument carry out real-time manual debugging, and debugging work is very cumbersome.
The purpose of this utility model is to provide a kind of at above-mentioned deficiency can follow the tracks of drift amount, compensation automatically in time, irrelevant with the discreteness of infrared detector easily, and circuit structure is simple, debugging is convenient, lower-cost end-expiratory carbon dioxide detector with automatic compensation function.
The purpose of this utility model can realize by following technical solution: the end-expiratory carbon dioxide detector with automatic compensation function, include solenoid valve, infrared light supply, air chamber, infrared detector, amplifier, its design feature is that it has micro computer, digital-to-analogue (D/A) converter and adjustable voltage stabilizer, the pipeline input port RA1 of micro computer is connected with the output pin of amplifier, and its two-way input/output port RA2 is connected with solenoid valve, the output of micro computer connects the input of digital to analog converter, the output of digital to analog converter is connected with the input of adjustable voltage stabilizer, and the output of adjustable voltage stabilizer directly is connected with the filament of infrared light supply.
The purpose of this utility model can also be perfect in addition by following measure: described infrared light supply is the monochromatic light road, and described air chamber is single air chamber.
Between the pipeline input port RA1 of the output terminal of amplifier and micro computer, also draw carbon dioxide signals output test point XO1.
Described adjustable voltage stabilizer is made of impact damper and three-terminal regulator block, and the input end of three-terminal regulator block is connected into unsteady reference potential.
Advantage and good effect that the utility model is compared with prior art had are: (one), can follow the tracks of the drift amount that is caused by temperature or other factors easily, compensation automatically in time, make the output quantity and the gas concentration lwevel of infrared detector proportional, form a simple curve, and irrelevant with the discreteness of infrared detector, the work of debugging like this is just very simple; (2), because the micro computer automatic tracking and compensating has been eliminated the error that causes because of manual debugging; (3), circuit structure is simple, cost is lower.
Below by embodiment and contrast accompanying drawing the utility model is described in detail:
Fig. 1 is a circuit block diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
As shown in Figure 1, present embodiment is made up of micro computer 1, solenoid valve 2, infrared light supply 3, air chamber 4, infrared detector 5, adjustable voltage stabilizer 6, amplifier 7, digital to analog converter 8, solenoid valve input port I is zero carbon dioxide input port, the input port II is tested gas input port, and operating voltage is direct current 5V.
As shown in Figure 2, zero carbon dioxide or tested gas are respectively from solenoid valve input port I or II, enter air chamber 4 through pipeline 2-1, the top of air chamber 4 is infrared light supplies 3, the below is an infrared detector 5, the output of infrared detector connects amplifier 7, the main element of amplifier is amplifier N1,3,2 pin just are respectively, negative input pin, 6 pin are output pin, the output of amplifier connects micro computer 1, the main devices of micro computer is integrated package U1, its pipeline input port RA1 is connected with the output pin (6 pin) of amplifier, also draw carbon dioxide signals output test point XO1 between resistance R 4 and pipeline input port RA1, the two-way input/output port RA2 of integrated package is connected with solenoid valve 2 through switching tube V1, and the signal of micro computer 1 is transported to the input end DI6～DI0 of digital to analog converter 8 (U2) by two-way input/output port RB6～RB0 of integrated package U1, and the output of digital to analog converter connects adjustable voltage stabilizer 6, and adjustable voltage stabilizer is by impact damper N
2Constitute with three-terminal regulator block N3, the output of adjustable voltage stabilizer 6 is connected with the filament of infrared light supply 3.During test, patient's tested gas enters air chamber 4 through solenoid valve input port II and pipeline 2-1, the signal that infrared detector 5 obtains is by negative input end (2 pin) input of amplifier 7, amplify micro computer 1 is transported in the back by output pin (6 pin) pipeline input port RA1, and sample at test point XO1, micro computer 1 is regularly from two-way I/O mouth RA2 output signal (high level is effective), gauge tap pipe V1 switching solenoid valve 2 is introduced zero carbon dioxide, pipeline input port RA1 is the drift amount that causes owing to labile factors such as infrared detector Yin Wendu drifts at detection test points XO1 place simultaneously, with adopt data and the standard value of micro computer internal memory compare, if deviation is arranged, promptly compare compensation, offset data is by two-way I/O mouth RB6～RB0 output, deliver to precision D/A conversions such as digital to analog converter 8 (U2) carries out, from input end DI6～DI0 input, and convert the output of 256 grades of simulate amounts to by digital to analog converter, be connected to the positive-negative input end (3 of the impact damper N2 of adjustable voltage stabilizer 6 by output pin Iout1 and Iout2,2 pin), 6 pin are output terminal, be connected to the unsteady reference potential (GND end) of three-terminal regulator block N3, form an adjustable voltage stabilizer, the output voltage of control regulator block N3 changes synchronously, the output terminal of adjustable voltage stabilizer 6 directly is connected with the filament of infrared light supply 3, thereby reach stable and effectively control the filament voltage of infrared light supply, light intensity to infrared light supply has realized automatic control, reaches the purpose of automatic compensation.
Claims (4)
1, a kind of end-expiratory carbon dioxide detector with automatic compensation function, comprise solenoid valve (2), infrared light supply (3), air chamber (4), infrared detector (5), amplifier (7), it is characterized in that: it also has micro computer (1), digital-to-analogue (D/A) converter (8) and adjustable voltage stabilizer (6), the pipeline input port RA1 of micro computer (1) is connected with the output pin of amplifier (7), and its two-way input/output port RA2 is connected with solenoid valve (2), the output of micro computer (1) connects the input of digital to analog converter (8), the output of digital to analog converter (8) is connected with the input of adjustable voltage stabilizer (6), and the output terminal of adjustable voltage stabilizer directly links to each other with the filament of infrared light supply (3).
2, the end-expiratory carbon dioxide detector with automatic compensation function as claimed in claim 1 is characterized in that: described infrared light supply (3) is the monochromatic light road, and described air chamber (4) is single air chamber.
3, the end-expiratory carbon dioxide detector with automatic compensation function as claimed in claim 1 is characterized in that: also draw carbon dioxide signals output test point XO1 between the pipeline input port RA1 of the output terminal of amplifier (7) and micro computer (1).
4, the end-expiratory carbon dioxide detector with automatic compensation function as claimed in claim 1, it is characterized in that: described adjustable voltage stabilizer (6) is made of impact damper and three-terminal regulator block, and the input end of three-terminal regulator block is connected into unsteady reference potential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97249855 CN2315564Y (en) | 1997-11-19 | 1997-11-19 | Detector for end carbon dioxide of expiration with automatic compensating function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97249855 CN2315564Y (en) | 1997-11-19 | 1997-11-19 | Detector for end carbon dioxide of expiration with automatic compensating function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2315564Y true CN2315564Y (en) | 1999-04-21 |
Family
ID=33956645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97249855 Expired - Fee Related CN2315564Y (en) | 1997-11-19 | 1997-11-19 | Detector for end carbon dioxide of expiration with automatic compensating function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2315564Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101874735A (en) * | 2010-07-02 | 2010-11-03 | 天津大学 | Multiparameter compensation method for calculating carbon dioxide concentration |
| CN104586395A (en) * | 2015-02-04 | 2015-05-06 | 广州弘凯物联网服务有限公司 | Device and method for noninvasively detecting level of carbon dioxide in human blood |
-
1997
- 1997-11-19 CN CN 97249855 patent/CN2315564Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101874735A (en) * | 2010-07-02 | 2010-11-03 | 天津大学 | Multiparameter compensation method for calculating carbon dioxide concentration |
| CN101874735B (en) * | 2010-07-02 | 2011-12-28 | 天津大学 | Multiparameter compensation method for calculating carbon dioxide concentration |
| CN104586395A (en) * | 2015-02-04 | 2015-05-06 | 广州弘凯物联网服务有限公司 | Device and method for noninvasively detecting level of carbon dioxide in human blood |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |