CN211652686U - Anesthetic gas concentration measuring system - Google Patents
Anesthetic gas concentration measuring system Download PDFInfo
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- CN211652686U CN211652686U CN202020057773.4U CN202020057773U CN211652686U CN 211652686 U CN211652686 U CN 211652686U CN 202020057773 U CN202020057773 U CN 202020057773U CN 211652686 U CN211652686 U CN 211652686U
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Abstract
The utility model discloses an anesthetic gas concentration measurement system, can obtain each mist's flow in the first mist through setting up two at least flow sensor on conveyor's different positions, according to each mist's flow in the first mist and the ultrasonic wave concentration sensor's that is located the vaporizer low reaches measured data, can calculate flow and the concentration that obtains anesthetic gas in the second mist, be convenient for through real-time, accurate, control first mist's flow and concentration directly perceivedly in order to realize adjusting the concentration of second mist. In addition, the flow sensor is arranged behind the electromagnetic valve, so that the influence of the pressure of the electromagnetic valve on the stability of the airflow can be eliminated, the flow measurement precision is improved, and the anesthetic gas concentration measurement precision is further improved.
Description
Technical Field
The utility model relates to a gaseous detection technology field especially relates to an anesthetic gas concentration measurement system.
Background
Anesthesia machines or other medical devices having anesthesia function require monitoring of the concentration of anesthetic agent in the delivered mixed gas to control the delivered concentration of anesthetic agent within a certain range and in the event of a malfunction of the anesthesia machine, the delivery of anesthetic agent to the patient is stopped and the system flushed with fresh gas. Since the anesthetic agent is a volatile liquid, it needs to be vaporized by the vaporization chamber and mixed with the first mixed gas containing oxygen to form the second mixed gas. The concentration of the anesthetic agent is typically obtained by comparing the measurements of the first mixed gas and the second mixed gas.
The first mixed gas is typically a mixture of oxygen and nitrous oxide and/or air, and the concentration of the anesthetic agent in the second mixed gas is typically adjusted by adjusting the flow rate of the first mixed gas upstream of the vaporization chamber when the concentration of the anesthetic agent exceeds a predetermined range.
The traditional anesthetic gas concentration measurement method mostly adopts a non-dispersive infrared technology, for example, patent document CN101153840B discloses an infrared gas analyzer, which selects infrared light of a specific waveband to pass through a gas sample according to the absorption characteristic of a measured gas to infrared light of a certain waveband, and detects the concentration of anesthetic gas by using the relation between the attenuation of the infrared light and the concentration of the measured gas sample.
In order to reduce the cost of measuring the concentration of anesthetic gas, a technical solution of measuring the concentration of anesthetic gas by using an ultrasonic technique has appeared in the prior art, and patent document CN102811757B discloses an ultrasonic anesthetic measurement system, which determines the volume concentration of anesthetic gas in a gas mixture according to the measurement results of two ultrasonic concentration sensors by arranging one ultrasonic concentration sensor before and after a vaporization chamber. When the concentration of the anesthetic gas behind the vaporizing chamber is higher or lower, the concentration of the second mixed gas behind the vaporizing chamber needs to be adjusted by adjusting the flow of the first mixed gas in front of the vaporizing chamber, so that an ultrasonic sensor is arranged in front of the vaporizing chamber to measure the oxygen concentration, only the concentration of the first mixed gas can be measured, the flow of the first mixed gas cannot be intuitively reflected, the flow adjustment of the first mixed gas is inconvenient, and the adjustment and control of the concentration of the second mixed gas behind the vaporizing chamber are inconvenient.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides an anesthetic gas concentration measuring system.
An embodiment of the utility model provides an anesthetic gas concentration measurement system, include:
the conveying device is used for conveying first mixed gas, the first mixed gas is mixed gas consisting of oxygen and nitrous oxide or air, the conveying device comprises three air inlet branches, and air inlet ends of the three air inlet branches are respectively used for inputting O2Air and N2O, each air inlet branch is provided with an electromagnetic valve, and at least two flow sensors are arranged at different positions of the conveying device to obtain the flow of each mixed gas in the first mixed gas so as to obtain a first measurement result of the first mixed gas;
the vaporization chamber is used for vaporizing the anesthetic and mixing the anesthetic with the first mixed gas to obtain second mixed gas;
an ultrasonic concentration sensor located downstream of the vaporization chamber for measuring the sound velocity of the second mixed gas and providing a second measurement;
and the control unit is connected with the flow sensor and the ultrasonic concentration sensor and calculates the concentration of the anesthetic in the second mixed gas according to the first measurement result and the second measurement result.
Further, the flow sensors are all located downstream of the solenoid valve.
Furthermore, a flow sensor is respectively arranged at the junction of the air inlet branch where the oxygen is positioned and the three air inlet branches.
Further, a flow sensor is provided at each of the intake branches where oxygen is located and at the junction of the intake branches where nitrous oxide and air are located.
Furthermore, each air inlet branch is provided with a flow sensor.
Furthermore, the electromagnetic valve on each air inlet branch is a flow electromagnetic valve integrating the flow sensor function.
Further, the flow sensor is a thermal flow sensor or an ultrasonic flow sensor.
Further, the ultrasonic concentration sensor is of an X type, a W type, a V type, an N type, a pi type or a correlation type.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is: the utility model discloses an anesthetic gas concentration measurement system, can obtain each mist's flow in the first mist through setting up two at least flow sensor on conveyor's different positions, according to each mist's flow in the first mist and the ultrasonic wave concentration sensor's that is located the vaporizer low reaches measured data, can calculate flow and the concentration that obtains anesthetic gas in the second mist, be convenient for through real-time, accurate, control first mist's flow and concentration directly perceivedly in order to realize adjusting the concentration of second mist. In addition, the flow sensor is arranged behind the electromagnetic valve, so that the influence of the pressure of the electromagnetic valve on the stability of the airflow can be eliminated, the flow measurement precision is improved, and the anesthetic gas concentration measurement precision is further improved.
Drawings
Fig. 1 is a schematic diagram of an anesthetic gas concentration measuring system according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of an anesthetic gas concentration measuring system according to embodiment 2 of the present invention;
fig. 3 is a schematic diagram of an anesthetic gas concentration measuring system according to embodiment 3 of the present invention.
In the figure: 1-air inlet branch, 2-air inlet main path, 3-air outlet main path, 4-electromagnetic valve, 5-flow sensor, 6-vaporization chamber, 7-ultrasonic concentration sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be further described below with reference to the accompanying drawings.
Example 1
Referring to fig. 1, an embodiment of the present invention provides an anesthetic gas concentration measuring system, which includes a conveying device, a vaporizing chamber 6, an ultrasonic concentration sensor 7, and a control unit.
The conveying device is used for conveying first mixed gas, the first mixed gas is mixed gas formed by oxygen and nitrous oxide or air, the conveying device comprises three air inlet branches 1, and air inlet ends of the three air inlet branches 1 are respectively used for inputting O2Air and N2And O, each air inlet branch 1 is provided with an electromagnetic valve 4, and at least two flow sensors 5 are arranged at different positions of the conveying device to obtain the flow of each mixed gas in the first mixed gas, so as to obtain a first measurement result of the first mixed gas.
In this embodiment, a flow sensor 5 is disposed on each of the air inlet branches 1, and the flow sensor 5 is disposed downstream of the electromagnetic valve 4.
When the second mixed gas (anesthetic mixed gas) is produced, one of the gas inlet branch circuits 1 is closed through the electromagnetic valve 4, gas is introduced into the other two gas inlet branch circuits 1, and the two introduced gases are mixed to obtain the first mixed gas. Specifically, O is introduced from one air inlet branch 12AIR and one of the other two AIR inlet branch circuits 1 are introduced into AIR and N2O, form AIR, O2First mixed gas or N2O、O2A first mixed gas.
The electromagnetic valve 4 is used for adjusting the gas flow in the gas inlet branch 1, and the flow sensor 5 monitors the gas flow on the gas inlet branch 1. The flow sensor 5 and the solenoid valve 4 may be individually selected and connected in series as two components to the intake branch 1. Preferably, on each air inlet branch 1, the electromagnetic valve 4 is close to the air inlet end of the air inlet branch 1, and the flow sensor 5 is far away from the air inlet end of the air inlet branch 1. Thus, the flow sensor 5 is arranged behind the electromagnetic valve 4 to prevent the pressure of the electromagnetic valve 4 from causing unstable airflow and bringing errors to gas flow measurement, thereby causing low accuracy of measuring the concentration of the anesthetic gas. The flow sensor 5 may be a thermal flow sensor or an ultrasonic flow sensor.
Of course, each electromagnetic valve 4 and flow sensor 5 on the air intake branch 1 can also be selected as an electromagnetic flow valve, and the electromagnetic flow valve is connected to the air intake branch 1, and has the flow regulating function of the electromagnetic valve 4 and the flow monitoring function of the flow sensor 5.
The air outlet ends of the air inlet branch circuits 1 are converged and connected with one end of the air inlet main circuit 2, and the other end of the air inlet main circuit 2 is connected with an air inlet of the vaporization chamber 6. Specifically, the gas introduced into two of the three gas inlet branches 1 through two of the three gas inlet branches 1 is merged in the main gas inlet branch 2 to form a first mixed gas, and the first mixed gas flows into the vaporization chamber 6 through the main gas inlet branch 2 and is mixed with the anesthetic gas in the vaporization chamber 6 to form a second mixed gas.
And the gas outlet of the vaporization chamber 6 is connected with one end of the gas outlet main path 3 and the other end of the gas outlet main path 3 and is used for outputting second mixed gas outwards. The ultrasonic concentration sensor 7 is arranged on the main air outlet path 3. Here, the ultrasonic concentration sensor 7 is an X-type, W-type, V-type, N-type, pi-type, or opposite-type ultrasonic concentration sensor.
The control unit is respectively connected with all the flow sensors 5 and the ultrasonic concentration sensors 7, the flow sensor 5 on one of the air inlet branches 1 detects the oxygen flow therein, the flow sensor 5 on the other air inlet branch 1 detects the gas flow therein, that is, the first measurement result in this embodiment is the oxygen flow and the flow of the other gas, and the ultrasonic concentration sensor 7 detects the concentration of the second mixed gas, and the second measurement result in this embodiment is the concentration of the second mixed gas. The control unit can calculate the concentration of the first mixed gas according to the first measurement result and then can calculate the concentration of the anesthetic gas in the second mixed gas by combining the second measurement result.
In addition, a second mixed gas is delivered to the patient through the main gas outlet path 3. When the concentration of the anesthetic gas in the second mixed gas delivered to the patient needs to be adjusted, the requirement for adjusting the concentration of the anesthetic gas can be met only by adjusting the three electromagnetic valves 4 on the gas inlet branch 1.
Example 2
Unlike embodiment 1, the number of the flow sensors 5 is two, one of the flow sensors 5 is disposed on the intake branch 1 to which oxygen is input, and the other flow sensor 5 is disposed on the intake main path 2.
And the control unit is respectively connected with the two flow sensors 5 and the ultrasonic concentration sensor 7, the flow sensor 5 is used for measuring the oxygen flow in the air intake branch 1, the other flow sensor 5 is used for measuring the flow of the first mixed gas in the main air intake path 2, and the flow of each gas in the first mixed gas can be calculated according to the oxygen flow and the flow of the first mixed gas, namely the first measurement result is the oxygen flow and the first mixed gas flow. The concentration of the second mixed gas in the vaporization chamber 6 is measured by the ultrasonic concentration sensor 7. The control unit calculates a first mixed gas concentration according to the oxygen flow rate and the first mixed gas flow rate, and calculates the concentration of the anesthetic gas in the second mixed gas by combining the concentration of the second mixed gas.
Example 3
In this embodiment, the number of the flow sensors 5 is also two, and one of the flow sensors 5 is still disposed on the intake branch 1 to which oxygen is introduced, which is different from embodiment 2 in that: the other flow sensor 5 is located differently, in particular, the supply device is used for supplying air and N2One end of the two air inlet branch circuits 1 of the O is converged and then connected with the air inlet end of the flow sensor 5, and the air outlet end of the flow sensor 5 is converged with the air inlet branch circuit 1 which is introduced with oxygen and then connected with the air inlet main circuit 2.
The control unit is respectively connected with the two flow sensors 5 and the ultrasonic concentration sensor 7, the flow sensor 5 is used for measuring the oxygen flow in the air inlet branch 1, and the other flow sensor 5 is used for measuring the other gas (air or N) introduced into one of the other two air inlet branches 12O) flow rateI.e. the first measurement is the flow of oxygen and the flow of the other gas. The concentration of the second mixed gas in the vaporization chamber 6 is measured by the ultrasonic concentration sensor 7. The control unit calculates the concentration of the first mixed gas according to the flow rate of the oxygen and the flow rate of the other gas, and calculates the concentration of the anesthetic gas in the second mixed gas by combining the concentration of the second mixed gas.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (8)
1. An anesthetic gas concentration measuring system, comprising:
the conveying device is used for conveying first mixed gas, the first mixed gas is mixed gas consisting of oxygen and nitrous oxide or air, the conveying device comprises three air inlet branches, and air inlet ends of the three air inlet branches are respectively used for inputting O2Air and N2O, each air inlet branch is provided with an electromagnetic valve, and at least two flow sensors are arranged at different positions of the conveying device to obtain the flow of each mixed gas in the first mixed gas so as to obtain a first measurement result of the first mixed gas;
the vaporization chamber is used for vaporizing the anesthetic and mixing the anesthetic with the first mixed gas to obtain second mixed gas;
an ultrasonic concentration sensor located downstream of the vaporization chamber for measuring the sound velocity of the second mixed gas and providing a second measurement;
and the control unit is connected with the flow sensor and the ultrasonic concentration sensor and calculates the concentration of the anesthetic in the second mixed gas according to the first measurement result and the second measurement result.
2. An anesthetic gas concentration measuring system as claimed in claim 1, wherein: the flow sensors are all located at the downstream of the electromagnetic valve.
3. An anesthetic gas concentration measuring system as claimed in claim 2, wherein: and a flow sensor is respectively arranged at the junction of the air inlet branch where the oxygen is positioned and the three air inlet branches.
4. An anesthetic gas concentration measuring system as claimed in claim 2, wherein: and a flow sensor is respectively arranged at the junction of the air inlet branch where the oxygen is positioned and the air inlet branch where the nitrous oxide and the air are positioned.
5. An anesthetic gas concentration measuring system as claimed in claim 2, wherein: and each air inlet branch is provided with a flow sensor.
6. An anesthetic gas concentration measuring system as claimed in claim 1, wherein: and the electromagnetic valve on each air inlet branch is a flow electromagnetic valve integrating the flow sensor function.
7. An anesthetic gas concentration measuring system as claimed in claim 1, wherein: the flow sensor is a thermal flow sensor or an ultrasonic flow sensor.
8. An anesthetic gas concentration measuring system as claimed in claim 1, wherein: the ultrasonic concentration sensor is of an X type, a W type, a V type, an N type, a pi type or a correlation type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020057773.4U CN211652686U (en) | 2020-01-10 | 2020-01-10 | Anesthetic gas concentration measuring system |
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| CN202020057773.4U CN211652686U (en) | 2020-01-10 | 2020-01-10 | Anesthetic gas concentration measuring system |
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| CN211652686U true CN211652686U (en) | 2020-10-09 |
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| CN202020057773.4U Active CN211652686U (en) | 2020-01-10 | 2020-01-10 | Anesthetic gas concentration measuring system |
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