CN201058168Y - inhalation sedation device - Google Patents

Abstract

An inhalation sedation device comprises an oxygen source, an oxygen pressure regulator communicated with an output port of the oxygen source, a breathing pipeline, an anesthetic container, a distributor, a control valve, a flowmeter and a mixing chamber, wherein an inlet of the distributor is communicated with an outlet of the anesthetic container, an outlet of the distributor is communicated with a liquid input port of the mixing chamber, an input port of the control valve is communicated with an output port of the oxygen pressure regulator, an output port of the control valve is communicated with an input port of the flowmeter, an output port of the flowmeter is communicated with a gas input port of the mixing chamber, and the inhalation sedation device further comprises a three-way valve which is positioned between the oxygen source and the control valve or between the mixing chamber and the breathing pipeline so as to selectively provide oxygen or anesthetic-oxygen mixed gas for a patient. The device can effectively realize the direct mixing of the liquid anesthetic and the oxygen, and provides a way for improving the control precision of the concentration of the anesthetic.

Description

inhalation sedation device

technical field

The utility model relates to a device for injecting a medium into a human body, in particular to a device for affecting a patient's respiratory system by gas treatment, in particular to a breathing gas preparation device for mixing two different fluids, one of which is an anesthetic in liquid phase .

Background technique

Whether in a full-featured anesthesia machine or in a general analgesia/sedation device that can be easily operated by the user, the anesthetic is inhaled in the form of gas to humans and animals, and it is commonly used to provide anesthesia and sedation for the humans and animals. A drug delivery method.

Anesthesia machines are used for general anesthesia, oxygen supply, and assisted or controlled breathing. The concentration of oxygen and inhaled anesthetic required to be provided should be accurate, stable and easy to control. In addition to the basic components of the gas circuit, modern anesthesia machines are also equipped with electronic, computer control and monitoring equipment. Anesthesia machine includes gas supply device, flow meter, evaporator, ventilation system, anesthesia ventilator, monitoring and alarm device, anesthesia residual gas removal system and various accessories and joints, etc. The air supply device generally has O ₂ (oxygen), N ₂ O (nitrous oxide) and air inlet ports, and the hard leather tube for ventilation is connected to the central air supply system or compressed air cylinder; the flow meter is used to measure the flow of gas flow In order to prevent the anesthesia machine from outputting hypoxic gas, a flowmeter linkage device and an oxygen ratio monitoring device are commonly used to control the output ratio of the gas; the evaporator is an important device for the anesthesia machine to provide the patient with inhalation of anesthetic vapor. Some special structures are used to eliminate the influence _of temperature, flow rate, pressure and other factors, and to accurately dilute the concentration of _anesthetic vapor. 20% of the airflow passes through the evaporator to bring out saturated anesthetic vapor, and the other part of the airflow greater than 80% directly passes through the evaporator from the bypass, and the two meet at the outlet. At the outlet of the channel or the evaporation chamber, turning the concentration dial can cause a change in the resistance between them, so that the ratio of the two confluence changes. In order to maintain a relatively constant anesthetic concentration, the anesthetic evaporator should have perfect temperature compensation, pressure Devices such as compensation and flow control, these evaporators are designed for specific anesthetics and cannot be mixed. , adjust the flow of carrier gas and diluent gas respectively, and change the anesthetic concentration of the output gas, which can be used for various anesthetics, called constant flow evaporators; several commonly used evaporators: Ohmeda Tec 6 or 7 evaporator , when the temperature in the evaporating chamber drops, the bimetallic valve opens, and the airflow through the evaporating chamber increases to keep the output concentration of the evaporator stable. When the adjustment button rotates clockwise, the evaporator is turned on and the output concentration of the evaporator is adjusted; The Drager Vapor 2000 evaporator adopts a temperature-sensitive tapered shaft column to adjust the distribution ratio of the air flow. When the adjustment button rotates clockwise, turn on the evaporator and adjust the output concentration; the desflurane evaporator does not adopt the variable bypass type design, but uses electric heating and maintains a constant temperature of 39°C to make the desflurane vapor in the evaporation chamber The pressure is kept at 200kPa, and fresh O ₂ and N ₂ O do not enter the evaporation chamber. According to the opening position of the adjustment button and the size of the fresh air measured by the flow sensor, the evaporation chamber automatically releases a certain amount of desflurane vapor, which is consistent with the fresh The gas is mixed and output; the Aladin evaporator is a variable bypass, electronically controlled evaporator. Its structure is similar to that of Ohmeda Tec4 evaporator and Drager Vapor 2000 evaporator.

Existing respiratory gas preparation equipment that mixes two different fluids, one of which is an anesthetic in liquid phase, has various forms, such as: Chinese patent CN92200696.2 discloses a volatilizer for anesthesia machine, Chinese patent CN01815111 .6 discloses a container for inhaling anesthetics, Chinese patent CN95118868.2 discloses a method and device for preparing a gaseous mixture containing medium gas and evaporation additives, Chinese patent CN88103923.3 discloses an anesthetic vaporizer and A method for matching with a respirator (or anesthesia machine), Chinese patent CN99118371.1 discloses an inhalation anesthesia device including an auxiliary circuit gas pressure monitoring device, Chinese patent CN03811631.6 discloses a gas supply system, Chinese patent CN99222982 .0 discloses a nitrous oxide-oxygen analgesic machine, US Patent US2002069876 discloses a construction method of medical anesthesia equipment, and US Patent US20030233086 discloses a delivery system for sedative drugs.

However, in all these current breathing gas preparation devices, no matter whether the anesthetic agent is initially in a liquid state or a gaseous state, it is already in a gaseous state at the moment it is mixed with a delivery gas, such as oxygen, or the initial liquid anesthetic agent is mixed with oxygen. Before mixing, it is already in gaseous state. This kind of gas-gas mixing will have a kind of limitation for the accuracy of controlling the dosage of anesthetic.

The latest anesthesia theory is to make the patient feel no pain, but keep awake. Therefore, the required anesthetic concentration is much lower than 2%, sometimes even lower than 1%, which requires a very high accuracy of the breathing gas preparation equipment. and stability. Then, can other mixing methods, such as liquid-liquid or liquid-gas mixing, be implemented in the breathing gas preparation equipment to improve the control of the dosage accuracy of anesthetics?

Utility model content

The utility model aims to overcome the deficiencies of the prior art and provide a breathing gas preparation device which can effectively realize the direct mixing of liquid anesthetic and oxygen.

In order to achieve the above purpose, the utility model manufactures an inhalation sedative device, which includes an oxygen source and a breathing pipeline, and also includes: an anesthetic container, which is provided with an outlet and a power mechanism for promoting the liquid anesthetic to flow to the outlet; a distributor, which is provided with a an inlet, an outlet and a control mechanism for controlling flow from the inlet to the outlet; a control valve; a flow meter; a mixing chamber with a gas input, a liquid input and a gas output; The outlet of the anesthetic container is connected, the outlet of the distributor is connected with the liquid input port of the mixing chamber, the input port of the control valve is connected with the output port of the oxygen source, the output port of the control valve is connected with the input port of the flowmeter, and the flow rate The output port of the meter communicates with the gas input port of the mixing chamber; it also includes a three-way valve, which is located between the oxygen source and the control valve, and has one input port and two output ports, wherein the input port is connected to the oxygen The output port of the source is connected, one output port is connected with the input port of the control valve, and the other output port is connected with the breathing pipe; or, the three-way valve is located between the mixing chamber and the breathing pipe, with two input ports and one output port ports, wherein the output port communicates with the breathing pipeline, one input port communicates with the gas output port of the mixing chamber, and the other input port communicates with the output port of the oxygen source.

Also included is a sensor for detecting fluid pressure and/or temperature within the anesthetic container and/or mixing chamber.

It also includes an anesthetic gas analyzer for detecting the output gas parameters of the mixing chamber.

Also included is an electronic controller whose inputs include signals from the flow meter, signals from the sensor, signals from the three-way valve, and signals from the anesthetic gas analyzer, whose outputs include signals to the control in the dispenser. mechanism signal and a signal to the control port in the control valve

A heating element is arranged in the mixing chamber.

The power mechanism in the anesthetic agent container includes an opening on the container to which air is supplied by a pressure regulator connected in series with the oxygen source, or supplied by a pressure regulator connected in series with a compressed air source. Open the mouth to supply air.

The power mechanism in the anesthetic container also includes a piston that is driven by the air supply from the opening and is used to seal and pressurize the liquid anesthetic.

The power mechanism in the anesthetic container includes a piston driven by an external machine, which is used to pressurize the liquid anesthetic.

The power mechanism in the anesthetic container includes a hydraulic pump.

The control mechanism in the distributor includes a distributing valve and a nozzle, the outlet of the nozzle is the outlet of the distributor, and the switching frequency and opening time of the distributing valve are controlled.

Compared with the prior art, the inhalation sedation device of the utility model can effectively realize the direct mixing of liquid anesthetic and oxygen, and provides a way for improving the control accuracy of the anesthetic concentration.

Description of drawings

Fig. 1 is a schematic diagram of Embodiment 1 of the inhalation sedation device of the present invention;

Fig. 2 is the schematic diagram of the second embodiment of the utility model;

Fig. 3 is a schematic diagram of a third embodiment of the utility model;

Fig. 4 is a schematic diagram of a fourth embodiment of the utility model;

Fig. 5 is a schematic diagram of Embodiment 1 of the power mechanism described in the utility model;

Fig. 6 is a schematic diagram of Embodiment 2 of the power mechanism described in the present invention;

Fig. 7 is a schematic diagram of Embodiment 3 of the power mechanism described in the present invention;

Fig. 8 is a schematic diagram of Embodiment 4 of the power mechanism described in the present invention;

Fig. 9 is a schematic diagram of Embodiment 1 of the mixing chamber described in the utility model;

Fig. 10 is a schematic diagram of Embodiment 2 of the mixing chamber of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further elaborated.

The inhalation sedation device of the present utility model, as shown in Figure 1-10, comprises an oxygen source 1, a breathing pipeline 12, an anesthetic container 3, a distributor 4, a control valve 6, a flow meter 7, a mixing chamber 8, and the distributor 4 The inlet of the distributor communicates with the outlet of the anesthetic container 3, the outlet 4 of the distributor communicates with the liquid input port 8b of the mixing chamber 8, the input port of the control valve 6 communicates with the output port of the oxygen source 1, and the output port of the control valve 6 communicates with the The input port of the flow meter 7 is connected, and the output port of the flow meter 7 is connected with the gas input port 8a of the mixing chamber 8; a three-way valve 10 is also included, and the three-way valve 10 is located between the oxygen source 1 and the control valve 6 , or between the mixing chamber 8 and the breathing tube 12 . It also includes a sensor 9 for detecting the fluid pressure and/or temperature in the anesthetic container and/or the mixing chamber, an anesthetic gas analyzer 11 for detecting the output gas parameters of the mixing chamber, an electronic controller 14, and Inputs include the flow signal from the flow meter, the gas pressure and/or temperature signal in the mixing chamber from the sensor, the status signal from the three-way valve, and the signal from the anesthetic gas analyzer, whose output includes a signal to the distributor The signal of the control mechanism in the middle and the signal to the control port of the control valve, oxygen or anesthetic agent-oxygen mixed gas is provided to the patient 13 through the breathing tube 12 .

As shown in Figure 1, the first embodiment of the inhalation sedative device of the present utility model, the three-way valve 10 is located between the mixing chamber 8 and the breathing pipeline 12, and is provided with two input ports and one output port, wherein the output port and the breathing pipeline 12, one input port communicates with the gas output port 8c of the mixing chamber 8, and the other input port communicates with the output port of the oxygen source 1. A pressure regulator 5 is provided between the oxygen source 1 and the control valve 6 . The power of the anesthetic agent container 3 is provided by the oxygen in the oxygen source 1 after being decompressed by the pressure regulator 2 .

As shown in the second embodiment of the inhalation sedation device of the present invention shown in FIG. 2 , the power of the anesthetic container 3 is provided by a hydraulic pump 15 , and a pressure regulator 16 is provided between the hydraulic pump 15 and the distributor 4 .

As shown in FIG. 3 , the third embodiment of the inhalation sedative device of the present invention, the power of the anesthetic container 3 is provided by a compressed air device 17 , and a pressure regulator 18 is provided between it and the anesthetic container 3 .

As shown in Figure 4, the fourth embodiment of the inhalation sedative device of the present utility model, the three-way valve 10 is located between the oxygen source 1 and the control valve 6, and is provided with an input port and two output ports, wherein the input port is connected to the oxygen The output ports of the source 1 are communicated, one output port is communicated with the input port of the control valve 6 , and the other output port is communicated with the breathing pipeline 12 . A filter 19 is provided between the anesthetic agent container 3 and the dispenser 4 to remove impurities in the anesthetic liquid. A throttle valve 20 is provided between the oxygen source 1 and the pressure regulator 2 , and a throttle valve 21 is provided between the output port of the three-way valve 10 and the breathing pipeline 12 .

As shown in Figure 5, the first embodiment of the power mechanism of the present utility model, the anesthetic container 3 is provided with an opening 3b, a liquid capacity indicator 3a, and a sensor for detecting the fluid pressure and/or temperature in the anesthetic container 3 9a.

As shown in Fig. 6, the second embodiment of the power mechanism of the present utility model, the anesthetic agent container 3 is also provided with a piston 3d driven by the air supply from the opening 3b to seal and pressurize the liquid anesthetic agent. Setting the piston 3d can prevent the anesthetic gas from flowing back to the pressure regulator, and also eliminate the shortcoming that oxygen/air directly contacts the anesthetic fluid.

As shown in Fig. 7, the third embodiment of the power mechanism of the utility model, the anesthetic container 3 is connected with a hydraulic pump 15, and then sends liquid to the distributor 4 through a pressure regulator 16.

As shown in Figure 8, the fourth embodiment of the power mechanism of the present utility model, the anesthetic container 3 is also provided with a piston 3d for sealing and pressing the liquid anesthetic, and the piston 3d is driven by an external machine via a piston rod 3e.

As shown in Fig. 9, the first mixing chamber embodiment of the present invention, the mixing chamber 8 includes a compressed oxygen input port 8a, a liquid anesthetic agent input port 8b, and an anesthetic agent-oxygen mixed gas output port 8c. The function of the mixing chamber 8 is to vaporize the injected inhaled anesthetic liquid and mix the anesthetic gas with the oxygen flow. The mixing chamber 8 has a cylindrical shape, but is not limited to a cylindrical shape. The material can be stainless steel, but is not limited to stainless steel, for example glass is also available.

As shown in Figure 10, the second embodiment of the mixing chamber of the present invention, in order to accelerate the gasification process, the mixing chamber 8 can be kept within a certain temperature range, that is, it can be heated by installing a heating component in the mixing chamber 8 In this way, the anesthetic liquid injected into the mixing chamber 8 can be poured on the hot component 8d after entering the mixing chamber 8.

Since the distribution system, the electronic control system and the sensors used in the utility model all belong to existing mature technologies, so no more details are given here.

Because the inhalation sedation device of the present invention can precisely control the distribution volume of the inhalation anesthetic liquid, the anesthetic concentration in the oxygen is very accurate and stable, and the distribution volume can be controlled within a precision of one millionth of a liter (10 ^-6 L) , the concentration error can be controlled below one percent (1%).

The key of the inhalation sedation device of the present invention is that the liquid anesthetic is injected into the mixing chamber and mixed with oxygen, and the gasification of the anesthetic is completed at the same time or after the mixing.

The above content is only a preferred embodiment of the utility model, and is not intended to limit the implementation of the utility model. Those skilled in the art can easily make corresponding modifications or modifications according to the main idea and spirit of the utility model , so the protection scope of the present utility model should be based on the protection scope required by the claims.

Claims (10)

1. An inhalation sedative device, comprising an oxygen source and a breathing pipeline, is characterized in that, also comprising: An anesthetic agent container having an outlet and a power mechanism for facilitating the flow of liquid anesthetic agent to the outlet; a distributor having an inlet, an outlet and a control mechanism for controlling flow from the inlet to the outlet; a control valve; a flow meter; a mixing chamber with a gas input port, a liquid input port and a gas output port; The inlet of the distributor communicates with the outlet of the anesthetic container, the outlet of the distributor communicates with the liquid input port of the mixing chamber, the input port of the control valve communicates with the output port of the oxygen source, and the output port of the control valve communicates with the flow meter. The input port is communicated, and the output port of the flow meter is communicated with the gas input port of the mixing chamber; It also includes a three-way valve, which is located between the oxygen source and the control valve, and is provided with an input port and two output ports, wherein the input port communicates with the output port of the oxygen source, and one output port communicates with the output port of the control valve. The input port is connected, and the other output port is connected with the breathing tube; or, The three-way valve is located between the mixing chamber and the breathing pipeline, and is provided with two input ports and one output port, wherein the output port communicates with the breathing pipeline, one input port communicates with the gas output port of the mixing chamber, and the other input port communicates with the gas output port of the mixing chamber. The port is in communication with the output port of the oxygen source. 2. The inhalation sedation device according to claim 1, further comprising: A sensor for detecting fluid pressure and/or temperature within the anesthetic container and/or mixing chamber. 3. The inhalation sedation device according to claim 2, further comprising: An anesthetic gas analyzer for detecting the output gas parameters of the mixing chamber. 4. The inhalation sedation device according to claim 3, further comprising: an electronic controller whose inputs include the signals from the flow meter, the sensor, the three-way valve, and the anesthetic gas analyzer and whose outputs include the signals to the control mechanism in the dispenser signal and a signal to the control port in the control valve. 5. The inhalation sedation device according to any one of claims 1 to 4, characterized in that: A heating element is arranged in the mixing chamber. 6. The inhalation sedation device according to any one of claims 1 to 4, characterized in that: The power mechanism in the anesthetic agent container includes an opening on the container to which air is supplied by a pressure regulator connected in series with the oxygen source, or supplied by a pressure regulator connected in series with a compressed air source. Open the mouth to supply air. 7. The inhalation sedation device according to claim 6, characterized in that: The power mechanism in the anesthetic container also includes a piston that is driven by the air supply from the opening and is used to seal and pressurize the liquid anesthetic. 8. The inhalation sedation device according to any one of claims 1 to 4, characterized in that: The power mechanism in the anesthetic container includes a piston driven by an external machine, which is used to pressurize the liquid anesthetic. 9. The inhalation sedation device according to any one of claims 1 to 4, characterized in that: The power mechanism in the anesthetic container includes a hydraulic pump. 10. The inhalation sedation device according to any one of claims 1 to 4, characterized in that: The control mechanism in the distributor includes a distributing valve and a nozzle, the outlet of the nozzle is the outlet of the distributor, and the switching frequency and opening time of the distributing valve are controlled.

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