CN218106538U - Anesthetic vaporizer and anesthesia machine - Google Patents

Abstract

The embodiment of the application provides an anesthetic vaporizer and an anesthetic machine, which comprise an anesthetic gas path, a carrier gas path, a differential pressure sensor, a first electromagnetic valve, a second electromagnetic valve and a control unit, wherein the differential pressure sensor is provided with an anesthetic gas sampling end and a carrier gas sampling end, the anesthetic gas sampling end is connected with the anesthetic gas path through a first branch, and the carrier gas sampling end is connected with the carrier gas path through a second branch; the first electromagnetic valve comprises a sampling working position for communicating the first branch and a zero calibration working position for closing the first branch and communicating the anesthetic gas sampling end with the atmosphere; the second electromagnetic valve comprises a sampling working position for conducting the second branch and a zero calibration working position for closing the second branch and communicating the carrier gas sampling end with the atmosphere; the control unit is used for controlling the first electromagnetic valve and the second electromagnetic valve to switch the working positions. According to the embodiment of the application, zero drift of the differential pressure sensor can be eliminated, zero calibration is automatically carried out on the differential pressure sensor, and accuracy of anesthetic gas output concentration of the anesthetic vaporizer is improved.

Description

Anesthetic vaporizer and anesthesia machine

Technical Field

The application relates to the technical field of medical equipment, in particular to an anesthetic vaporizer and an anesthetic machine.

Background

Anesthetic vaporizers are an important component of anesthesia machines. The principle of the anesthetic vaporizer is that the liquid anesthetic is heated to generate vaporized gas by utilizing the change of the temperature of the surrounding environment and the heat source, and the vaporized gas is mixed with carrier gas (such as fresh gas) through a certain amount of anesthetic vapor to form a gas flow with a certain concentration of anesthetic gas, and the gas flow enters a breathing circuit.

Currently known liquid anesthetics include isoflurane, sevoflurane, desflurane, etc., wherein the desflurane anesthetic has a boiling point of 22.8 deg.C and a vapor pressure of 669mmHg at 20 deg.C, near atmospheric pressure, and boils at normal room temperature. Because conventional mechanical evaporators are not sufficient to continuously supply the heat required for the vaporization of desflurane, desflurane anesthetic output cannot be safely controlled. Therefore, the output concentration of desflurane anesthetic cannot be controlled using a conventional mechanical evaporator.

In the correlation technique, desflurane anesthetic vaporizer adopts the heating mode to make the anesthetic pond have higher vapor pressure, controls the pressure balance at pressure differential sensor both ends through drive proportional valve to reach anticipated anesthetic concentration, but pressure differential sensor has certain null shift, and along with the long-time use of equipment, pressure differential sensor's zero point can drift, thereby leads to anesthetic vaporizer output concentration inaccurate, influences the anesthesia effect.

SUMMERY OF THE UTILITY MODEL

In view of the above, embodiments of the present application are expected to provide an anesthetic vaporizer and an anesthetic machine capable of automatically zeroing a differential pressure sensor.

The embodiment of the application provides an anesthetic vaporizer, includes:

a medicine pool;

the inlet of the anesthesia gas circuit is communicated with the medicine pool;

the tail end of the gas-carrying gas path is communicated with the tail end of the anesthesia gas path;

the pressure difference sensor is provided with at least two sampling ends, each sampling end comprises an anesthetic gas sampling end and a carrier gas sampling end, the anesthetic gas sampling end is connected with the anesthetic gas path through a first branch, and the carrier gas sampling end is connected with the carrier gas path through a second branch;

the first electromagnetic valve is arranged on the first branch and provided with a first zero calibration valve port communicated with the atmosphere, and the first electromagnetic valve comprises a sampling working position for communicating the first branch and a zero calibration working position for closing the first branch and communicating the anesthetic gas sampling end with the atmosphere through the first zero calibration valve port;

the second electromagnetic valve is arranged on the second branch and is provided with a second zero setting valve port communicated with the atmosphere, the second electromagnetic valve comprises a sampling working position for communicating the second branch, and a zero setting working position for closing the second branch and communicating the carrier gas sampling end with the atmosphere through the second zero setting valve port;

and the control unit is used for controlling the first electromagnetic valve and the second electromagnetic valve to switch working positions.

According to the anesthetic vaporizer, the control unit controls the working position switching of the first electromagnetic valve and the second electromagnetic valve, zero drift of the differential pressure sensor is eliminated, zero calibration of the differential pressure sensor can be automatically achieved, manual calibration of a user is not needed, and accuracy of anesthetic gas output concentration of the anesthetic vaporizer is improved; in addition, the first electromagnetic valve and the second electromagnetic valve are reliable in control, simple in structure, long in service life, low in cost and convenient to popularize and use.

According to the anesthetic vaporizer, anesthetic compatibility is met only by the anesthetic gas sampling end of the differential pressure sensor, special requirements for the carrier gas sampling end are avoided, and complexity of type selection of the differential pressure sensor is reduced.

The embodiment of the application provides an anesthesia machine, which comprises

The main machine of the anesthesia machine is provided with an evaporator connecting seat and an air supply system;

and the anesthetic vaporizer is installed on the vaporizer connecting seat, the gas supply system is connected with the anesthetic vaporizer, so that the anesthetic vaporizer can provide anesthetic gas to a patient through a breathing loop.

Drawings

FIG. 1 is a schematic diagram of the gas circuit of an anesthetic vaporizer according to an embodiment of the present application;

FIG. 2 is a schematic view of the structure of FIG. 1 in another state;

FIG. 3 is a logic block diagram corresponding to the structure shown in FIG. 1;

FIG. 4 is a schematic diagram of the gas circuit of an anesthetic vaporizer according to another embodiment of the present application;

FIG. 5 is a schematic view of the structure of FIG. 4 in another state;

fig. 6 is a schematic structural diagram of an assembled air circuit block, a first electromagnetic valve, a second electromagnetic valve, a differential pressure sensor and other components according to an embodiment of the present disclosure;

FIG. 7 is an exploded view of the first and second solenoid valves of the configuration of FIG. 6;

FIG. 8 is an exploded view of the components of the differential pressure sensor, the sealing sleeve, the spacing bracket, etc. of the structure shown in FIG. 6;

FIG. 9 is a schematic, partially cross-sectional view of the structure of FIG. 6 from yet another perspective;

figure 10 is an enlarged partial schematic view of the sealing sleeve of figure 9.

Description of the reference numerals

A medicine pool component 1; a medicine pool 11; heating element 12

An anesthesia gas circuit 2; a safety valve 21; a proportional valve 22; a cone valve 23;

a carrier gas path 3; a second gas resistance element 31;

a first branch 41; a second branch 42; a third branch 43; a fourth branch 44; a first air resistive element 45;

a differential pressure sensor 5; an anesthetic gas sampling end 512; a carrier gas sampling end 513; the ceramic plate 511;

a sealing sleeve 81; a first segment 811; a seal section 812; a second section 813; a mounting substrate 82; a limit bracket 83; a limit plate 831; the penetration grooves 831a; a connecting plate 832;

a first electromagnetic valve 61; a second solenoid valve 62; second valve port 62a

An air passage block 7; the first sampling hole 71a; the second sampling hole 71b; the first hole 71c; the second hole 71d; the third hole 71f; a fourth hole 71g; a fifth hole 71h; a sixth hole 71k; a fourth flow passage 704; a fifth flow channel 705; sixth flow passage 706

Control unit 100

Detailed Description

Embodiments of the present application will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the present application but are not intended to limit the scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only used for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The embodiment of the application provides an anesthetic vaporizer which is used for an anesthetic machine.

The anesthesia machine comprises an air supply system, a flow control system, an anesthesia evaporator and a breathing loop. Wherein, the gas supply system, the flow control system and the anesthesia evaporator form a main machine of the anesthesia machine after being integrated, and fresh gas is provided for the breathing loop.

The gas supply system is an important component of the anesthesia machine for providing gas flow and power for a patient, and the gas source of the anesthesia machine can be simultaneously provided with various gas sources such as oxygen, laughing gas, air and the like, wherein the mixed gas of the oxygen, the air and the helium and oxygen is diluent gas, and the laughing gas is anesthetic gas.

The flow control system delivers the flow controlled gas to the anesthetic vaporizer and the anesthetic circuit while preventing the formation and output of a low oxygen gas mixture.

The principle of the anesthetic vaporizer is that a liquid anesthetic is vaporized into anesthetic gas by heating anesthetic, a certain amount of anesthetic gas is mixed with a carrier gas to form a gas flow of anesthetic gas with a certain concentration, and the gas flow enters a breathing circuit.

The breathing circuit is a ventilation system in which the anesthesia machine directly manages the mechanical ventilation and breathing gas of the patient.

Referring to fig. 1, 2, 3, 4 and 5, an anesthetic vaporizer according to an embodiment of the present application includes: the device comprises a medicine pool component 1, an anesthesia gas circuit 2, a carrier gas circuit 3, a differential pressure sensor 5, a first electromagnetic valve 61, a second electromagnetic valve 62 and a control unit 100.

Medicine pond subassembly 1 includes medicine pond 11 and heating member 12, and medicine pond 11 is a relative confined space, and liquid anesthetic among the anesthesia medicine bottle pours into medicine pond 11 into, and heating member 12 is used for heating the anesthetic in the medicine pond 11 to promote liquid anesthetic evaporation become anesthetic gas, it is required to explain that heating member 12 can set up inside medicine pond 11.

Note that, the specific type of the heating member 12 is not limited, and examples thereof include a heating tube, a PTC (Positive Temperature Coefficient), and the like. The mounting position of the heating member 12 is not limited as long as heat can be transferred to the anesthetic agent. For example, the heating element 12 may be disposed outside the reservoir 11, or may be disposed inside the reservoir 11.

The inlet of the anesthesia gas circuit 2 is communicated with the drug pool 11, and the anesthesia gas in the drug pool 11 enters the anesthesia gas circuit 2 through the steam outlet of the drug pool 11.

The anesthesia air passage 2 is provided with a safety valve 21 and a proportional valve 22. The safety valve 21 is used to close or open the anesthesia airway 2. When the anesthetic vaporizer is abnormal, the safety valve 21 is closed to prevent the output of the anesthetic gas with too high concentration, thereby protecting the safety of the patient.

The proportional valve 22 is used for regulating the flow rate of the anesthetic gas in the anesthetic gas circuit 2, and the proportional valve 22 is located downstream of the safety valve 21. Specifically, the proportional valve 22 is adjustable in opening to control the flow of anesthetic gas through the proportional valve 22.

The tail end of the carrier gas path 3 along the airflow flowing direction is communicated with the tail end of the anesthesia gas path 2 along the airflow flowing direction. Specifically, a connection point between the tail end of the carrier gas path 3 and the tail end of the anesthesia gas path 2 is B3, and the carrier gas of the carrier gas path 3 and the anesthesia gas of the anesthesia gas path 2 are mixed with each other at the connection point B3 and then discharged from a mixing outlet of the anesthesia vaporizer, and enter the breathing circuit.

It should be noted that the connection points in the embodiments of the present application are all simplified to one point in principle, and are not points in a mathematical sense.

In fig. 1 to 5, the arrows on the carrier gas path 3 and the arrows on the anesthetic path 2 indicate the gas flow direction.

The differential pressure sensor 5 is used for collecting the differential pressure of the anesthesia gas circuit 2 and the carrier gas circuit 3.

Specifically, the differential pressure sensor 5 has at least two sampling ends, including an anesthetic gas sampling end 512 and a carrier gas sampling end 513. The anesthetic gas sampling end 512 is connected with the anesthetic gas path 2 through a first branch 41, the connection point is B1, and the carrier gas sampling end 513 is connected with the carrier gas path 3 through a second branch 42, the connection point is B2.

The first solenoid valve 61 is provided in the first branch 41, the operating positions of the first solenoid valve 61 include a zero calibration operating position (see fig. 2 and 5) and a sampling operating position (see fig. 1 and 4), and the first solenoid valve 61 has a first zero calibration valve port that communicates with the atmosphere. Referring to fig. 2 and 5, in the zero calibration working position, the first electromagnetic valve 61 closes the first branch line 41 and connects the anesthetic gas sampling port 512 to the atmosphere through the first zero calibration valve port, at this time, the anesthetic gas in the anesthetic gas path does not reach the anesthetic gas sampling port 512, and the anesthetic gas sampling port 512 collects atmospheric pressure. Referring to fig. 1 and 4, in the sampling working position, the first solenoid valve 61 conducts the first branch 41, the anesthetic gas in the anesthetic gas circuit 2 reaches the anesthetic gas sampling end 512 through the first branch 41, and the pressure of the anesthetic gas circuit 2 is collected by the anesthetic gas sampling end 512.

The second solenoid valve 62 is disposed on the second branch 42, the operating positions of the second solenoid valve 62 include a zeroing operating position (refer to fig. 2 and 5) and a sampling operating position (refer to fig. 1 and 4), and the second solenoid valve 62 has a second zeroing valve port communicated with the atmosphere. Referring to fig. 2 and 5, in the zero calibration position, the second electromagnetic valve 62 closes the second branch 42 and connects the carrier gas sampling port 513 to the atmosphere through the second zero calibration valve port, at this time, the carrier gas in the carrier gas path 3 does not reach the carrier gas sampling port 513, and the pressure collected by the carrier gas sampling port 513 is the atmospheric pressure. Referring to fig. 1 and fig. 4, in the sampling working position, the second electromagnetic valve 62 conducts the second branch 42, the carrier gas in the carrier gas circuit 3 reaches the carrier gas sampling end 513 through the second branch 42, and the pressure of the carrier gas circuit 3 is collected by the carrier gas sampling end 513.

It should be noted that the sampling end (including the anesthetic gas sampling end 512 and the carrier gas sampling end 513) is communicated with the atmosphere through the first zeroing valve port or the second zeroing valve port, the first zeroing valve port or the second zeroing valve port may be directly communicated with the atmosphere, or may be communicated with the atmosphere through a pipeline (including a flow passage).

In the case where the anesthetic vaporizer does not need to zero the differential pressure sensor 5, both the first solenoid valve 61 and the second solenoid valve 62 default to the sampling positions shown in fig. 1 and 4.

Illustratively, the first solenoid valve 61 and the second solenoid valve 62 are in the sampling operating position in the de-energized state and in the zeroing operating position in the energized state.

The control unit 100 electrically connects the first solenoid valve 61 and the second solenoid valve 62 to control the first solenoid valve 61 and the second solenoid valve 62 to switch the operating positions. That is, the control unit 100 is configured to control energization and deenergization of the first solenoid valve 61 and the second solenoid valve 62.

When the anesthetic vaporizer needs to zero the differential pressure sensor 5, the control unit 100 controls the first solenoid valve 61 and the second solenoid valve 62 to be energized, so that both the first solenoid valve and the second solenoid valve are switched to the zero calibration working positions shown in fig. 2 and 5 under the action of internal electromagnetic force, at this time, the carrier gas sampling end 513 collects atmospheric pressure, the anesthetic gas sampling end 512 collects atmospheric pressure, and the pressures of the two sampling ends of the differential pressure sensor 5 are the same, thereby realizing zero calibration of the differential pressure sensor 5. After the zero calibration is finished, the control unit 100 controls the first solenoid valve 61 and the second solenoid valve 62 to be de-energized, so that the two are switched from the zero calibration working position to the sampling working position under the action of the springs in the two.

It should be noted that, during the normal operation of the anesthetic vaporizer, that is, during the process of continuously outputting anesthetic gas, the first solenoid valve 61 and the second solenoid valve 62 are both at the sampling operation positions shown in fig. 1 and 4, the differential pressure detection signal of the differential pressure sensor 5 is fed back to the control unit 100, and the control unit 100 automatically adjusts the opening degree of the proportional valve 22 according to the differential pressure detection signal, so that the differential pressures at the two ends of the differential pressure sensor 5 are substantially equal.

According to the anesthetic vaporizer disclosed by the embodiment of the application, the control unit 100 controls the working position switching of the first electromagnetic valve 61 and the second electromagnetic valve 62, the zero drift of the differential pressure sensor 5 is eliminated, the zero calibration of the differential pressure sensor 5 can be automatically realized, the manual calibration of a user is not needed, and the accuracy of the anesthetic gas output concentration of the anesthetic vaporizer is improved; in addition, the first electromagnetic valve 61 and the second electromagnetic valve 62 are reliable in control, simple in structure, long in service life, low in cost and convenient to popularize and use.

According to the anesthetic vaporizer, anesthetic compatibility is met only by the pressure difference sensor anesthetic gas sampling end 512, special requirements for the carrier gas sampling end 513 are avoided, and complexity of type selection of the pressure difference sensor 5 is reduced.

Referring to fig. 3, the medicine tank assembly 1 is provided with a temperature sensor, a heating element 12 and a control unit 100.

Illustratively, a cone valve 23 is arranged on the anesthesia air circuit 2, and the cone valve 23 is positioned between the connection point B1 and the connection point B2. The anesthetic vaporizer includes a hand wheel which is linked with the cone valve 23 to adjust the air resistance of the cone valve 23. In this embodiment, the cone valve 23 corresponds to an air resistance element with adjustable air resistance. When a user rotates the hand wheel, the hand wheel drives the cone valve 23 to move, so that the area of the cross section of the gas flow of the anesthesia gas circuit 2 at the cone valve 23 is changed, the output flow of the anesthesia gas circuit 2 is adjusted, and the concentration of the anesthesia gas output by the anesthesia evaporator is adjusted. When the user sets different concentrations, the air resistance corresponding to the cone valve 23 is also different.

Specifically, when the anesthetic vaporizer does not work, the handwheel is in a zero position, the control unit 100 controls the safety valve 21 and the proportional valve 22 to be closed, and the anesthetic vaporizer does not output anesthetic gas. When a user rotates a hand wheel, the hand wheel rotates to a non-zero position, a zero position sensor in the hand wheel triggers a signal, and the control unit 100 controls the safety valve 21 to be opened according to the triggering signal of the zero position sensor and adjusts the opening of the proportional valve 22.

The manner in which the control unit 100 automatically corrects zero of the differential pressure sensor 5 is not limited.

For example, when the zero position sensor detects that the hand wheel is switched from the zero position to the non-zero position, the control unit 100 controls the first solenoid valve 61 and the second solenoid valve 62 to switch from the sampling operation position to the zero calibration operation position, so that the anesthetic gas sampling port 512 is communicated with the atmosphere, and the anesthetic gas sampling port 512 is communicated with the atmosphere.

That is, in this embodiment, the anesthetic vaporizer initiates a zero calibration operation when the user turns the handwheel.

In other embodiments, the anesthetic vaporizer has a power-on self-test mode, wherein the power-on self-test mode is a mode in which the anesthetic vaporizer performs self-test when ac power is supplied. In the power-on self-test mode, the control unit 100 detects the states of the safety valve 21, the proportional valve 22, the first electromagnetic valve 61 and the second electromagnetic valve 62, and if the state of a valve core of one or some of the valves is detected to be abnormal, the anesthetic vaporizer outputs alarm information.

For example, in the power-on self-test mode, the control unit 100 controls the first solenoid valve 61 and the second solenoid valve 62 to switch the zero calibration operating position from the sampling operating position, so that the anesthetic gas sampling port 512 is communicated with the atmosphere, and the anesthetic gas sampling port 512 is communicated with the atmosphere. In this embodiment, the zero calibration of the differential pressure sensor 5 is started upon power-on.

It should be noted that in some embodiments, the anesthetic vaporizer may be configured with both of the above-mentioned two zeroing modes, or only one of them.

The number of the differential pressure sensors 5 may be one or two, and is not limited herein.

For example, referring to fig. 1, 2 and 3, in some embodiments, the number of the differential pressure sensor 5, the first branch 41 and the second branch 42 is one, and the number of the first solenoid valve 61 and the second solenoid valve 62 is also one.

In other embodiments, referring to fig. 4 and 5, the number of the differential pressure sensors 5 is two, two differential pressure sensors 5 are arranged in parallel between the first branch 41 and the second branch 42, the anesthetic gas sampling ends 512 of the two differential pressure sensors 5 are communicated through the third branch 43, and the carrier gas sampling ends 513 of the two differential pressure sensors 5 are communicated through the fourth branch 44; a first air resistance element 45 is arranged on each of the third branch 43 and the third branch 43.

Illustratively, the carrier gas circuit 3 is provided with a second gas-blocking element 31, and the second gas-blocking element 31 is located between the connection point of the second branch 42 and the carrier gas circuit 3 and the connection point of the carrier gas circuit 3 and the anesthesia gas circuit 2.

The anesthetic gas passage 2 is a flow passage for anesthetic gas, the carrier gas passage 3 is a flow passage for carrier gas, and the anesthetic gas passage 2 and the carrier gas passage 3 are not limited in the form of formation.

For example, referring to fig. 6 to 9, the anesthetic vaporizer includes a gas path block 7, and a plurality of flow channels are provided inside the gas path block 7 for gas to flow, that is, each flow channel may define at least a portion of the anesthetic gas path 2 and a portion of the carrier gas path 3.

Referring to fig. 8, the flow channel forms at least two sampling holes on the surface of the gas circuit block 7, more specifically, the flow channel forms a first sampling hole 71a on the surface of the gas circuit block 7, the other flow channel forms a second sampling hole 71b on the surface of the gas circuit block 7, and the differential pressure sensor 5 is mounted on the top side of the gas circuit block 7, referring to fig. 8 and 9, the anesthetic gas sampling end 512 is in a columnar shape and is inserted into the first sampling hole 71a, and the carrier gas sampling end 513 is in a columnar shape and is inserted into the second sampling hole 71 b. The first sampling hole 71a and the second sampling hole 71b are formed on the same side surface of the air passage block 7. In this embodiment, direct grafting cooperation between differential pressure sensor 5 and the air circuit piece 7 need not to connect through the pipeline, so, can make the structural arrangement between differential pressure sensor 5 and the air circuit piece 7 comparatively compact, save space.

It should be noted that the fitting between the anesthetic gas sampling end 512 and the first sampling hole 71a needs to be sealed, and the fitting between the carrier gas sampling end 513 and the second sampling hole 71b also needs to be sealed, so as to prevent gas from leaking into the indoor space.

For example, referring to fig. 8 to 10, the anesthetic vaporizer includes a plurality of sealing sleeves 81, a sampling end of at least one differential pressure sensor 5 is sealed with the sampling hole by two sealing sleeves 81, wherein one sealing sleeve 81 is sleeved on the anesthetic gas sampling end 512 and seals the anesthetic gas sampling end 512 and a hole wall of the first sampling hole 71a; another sealing sleeve 81 is sleeved on the carrier gas sampling end 513 and seals the carrier gas sampling end 513 and the hole wall of the second sampling hole 71b; two sampling ends of the same differential pressure sensor 5 are arranged in parallel, and two sealing sleeves 81 are connected with each other at a portion between the two sampling ends. The seal sleeve 81 can reduce the dimensional manufacturing accuracy of the anesthetic gas sampling end 512 and the first sampling hole 71a, reduce the dimensional manufacturing accuracy of the carrier gas sampling end 513 and the hole wall of the second sampling hole 71b, and reliably seal.

Illustratively, referring to fig. 10, the anesthetic gas sampling end 512 is in a frustum shape with a large top and a small bottom, i.e., the anesthetic gas sampling end 512 gradually decreases in outer diameter from top to bottom, so as to facilitate insertion into the first sampling hole 71 a. The carrier gas sampling end 513 is in a frustum shape with a large upper part and a small lower part, that is, the outer diameter of the carrier gas sampling end 513 is gradually reduced from top to bottom, so that the carrier gas sampling end can be conveniently inserted into the second sampling hole 71 b.

It should be noted that, because the anesthetic gas sampling end 512 and the carrier gas sampling end 513 are both cone frustum-shaped, each sealing sleeve 81 needs to adopt a fool-proof design to prevent the sealing performance from being affected by the installation of the upper end and the lower end of the sealing sleeve 81. For example, the outer surfaces of the upper and lower ends of the sealing sleeve 81 may be differently shaped, or may be otherwise configured to be foolproof.

In some embodiments, the two ends of each sealing sleeve 81 are asymmetric structures, one end of the sealing sleeve 81 close to the end surface of the sampling end is a first end, one end of the sealing sleeve 81 far away from the end surface of the sampling end is a second end, and the position where the two sealing sleeves 81 are connected to each other is located at the second end of the sealing sleeve 81, where the end surface of the sampling end is an end surface of the sampling end inserted into the sampling hole.

In addition, each sealing sleeve 81 has an outer shape of a frustum, wherein the diameter of the first end is smaller than that of the second end.

Referring to fig. 8, two sealing sleeves 81 corresponding to the same differential pressure sensor 5 are connected together, for example, by integral injection molding. So can form the fool-proof design, have comparatively obvious degree of recognition, be difficult to produce when the assembly and obscure.

The specific configuration of the sealing sleeve 81 is not limited. For example, a configuration of a ring-shaped seal ring is adopted, and for example, a cylindrical sleeve structure or the like is adopted.

Illustratively, referring to fig. 10, the sealing sleeve 81 includes a first section 811, a sealing section 812, and a second section 813 in sequence from the second end to the first end, and the outer diameters of the sealing section 812, the first section 811, and the second section 813 decrease in sequence. That is, the outer diameter of the sealing section 812 is largest, the outer diameter of the second section 813 is smallest, and the outer diameter of the first section 811 is larger than the outer diameter of the second section 813 and smaller than the outer diameter of the sealing section 812. The outer diameter of the sealing section 812 is larger than the aperture of the sampling hole and the corresponding part of the sealing section 812

Wherein, the outer diameter of the second section 813 is smaller than the diameter of the corresponding first sampling hole 71a or second sampling hole 71b; the first section 811 has an outer diameter larger than the bore diameter of the corresponding first or second sampling hole 71a or 71 b.

Specifically, if the sealing sleeve 81 is sleeved on the anesthetic gas sampling end 512, the outer diameter of the second section 813 is smaller than the aperture of the first sampling hole 71a, the outer diameters of the sealing section 812 and the first section 811 are both larger than the aperture of the corresponding first sampling hole 71a, that is, the second section 813 is in clearance fit with the first sampling hole 71a, the sealing section 812 and the first section 811 are both in interference fit with the first sampling hole 71a, and the interference between the sealing section 812 and the first sampling hole 71a is larger than the interference between the first section 811 and the first sampling hole 71 a.

Similarly, if the sealing sleeve 81 is sleeved on the carrier gas sampling end 513, the outer diameter of the second section 813 is smaller than the aperture of the second sampling hole 71b, the outer diameters of the sealing section 812 and the first section 811 are both larger than the aperture of the corresponding second sampling hole 71b, that is, the second section 813 is in clearance fit with the second sampling hole 71b, the sealing section 812 and the first section 811 are in interference fit with the second sampling hole 71b, and the interference magnitude between the sealing section 812 and the second sampling hole 71b is larger than that between the first section 811 and the second sampling hole 71 b.

For convenience of description, the following description will take the sealing sleeve 81 as an example to be sleeved on the anesthetic gas sampling end 512.

In this embodiment, when the sealing sleeve 81 is inserted into the first sampling hole 71a along with the anesthetic gas sampling end 512, the circumferential surface of the second section 813 does not contact with the hole wall of the first sampling hole 71a, so that the anesthetic gas sampling end 512 can be smoothly inserted into the first sampling hole 71 a. The sealing section 812 generates large deformation to achieve good gas sealing performance, and due to the fact that the first section 811 is in interference fit with the hole wall of the first sampling hole 71a, namely, no gap exists between the first section 811 and the hole wall, when the sealing section 812 generates deformation, the material at the sealing section 812 cannot be extruded upwards between the hole walls of the first section 811 and the first sampling hole 71a under the extrusion effect, and therefore the sealing reliability of the sealing section 812 can be improved.

Illustratively, the sealing segment 812 is disposed in a middle region of the sealing sleeve 81 along the axial length, wherein the middle region refers to a region of 2/5 to 3/5 of the axial length of the sealing sleeve 81, but is not limited thereto. In this embodiment, both the structural reliability and the insertion smoothness of the seal cover 81 can be considered.

Referring to fig. 6 to 8, the anesthetic vaporizer includes a mounting substrate 82, the differential pressure sensor 5 is integrally connected to the mounting substrate 82, and the mounting substrate 82 is mounted on the air passage block 7 by screws 9A, where the differential pressure sensor 5 may be directly or indirectly connected to the mounting substrate 82. In this embodiment, during the assembly process, the differential pressure sensor 5 and the mounting substrate 82 may be assembled into a pre-assembled unit, and then the pre-assembled unit may be mounted on the air passage block 7 by the screws 9A. On the one hand, the differential pressure sensor 5 and the mounting base plate 82 have a larger operation space, and on the other hand, the assembly efficiency of the anesthetic vaporizer can be improved.

Illustratively, the mounting substrate 82 is provided with at least one connection hole and at least two through holes, the carrier gas sampling end 513 passes through one of the through holes, and the anesthetic gas sampling end 512 passes through the other through hole; the screw 9A is inserted through the connection hole from the top down and screwed into the air passage block 7.

For example, referring to fig. 8, the anesthetic vaporizer includes a limiting bracket 83, the limiting bracket 83 has a limiting plate 831 and a connecting plate 832, the limiting plate 831 is disposed on a side of the differential pressure sensor 5 opposite to the sampling end, the limiting plate 831 is not in contact with the differential pressure sensor 5, and a screw 9B passes through the connecting plate 832 from top to bottom and is screwed into the air path block 7.

In this embodiment, because contactless between limiting plate 831 and differential pressure sensor 5, consequently, limiting plate 831 can not exert the effort to differential pressure sensor 5, on the one hand, avoids influencing differential pressure sensor 5's precision

In this embodiment, if the adhesion between the differential pressure sensor 5 and the mounting substrate 82 fails, since the gases in the anesthesia gas path 2 and the carrier gas path 3 both have a certain pressure, the pressure difference sensor 5 may have the pressure that is pushed upward, and when the pressure difference sensor 5 is pushed upward a little distance, the pressure difference sensor 5 will not be pushed upward continuously under the stopping action of the limiting plate 831, so that the pressure difference sensor 5 will not be separated from the mounting position, and the sampling function can be continuously realized.

The material of the limiting bracket 83 is not limited, and may be plastic, metal, etc., and is not limited herein.

Illustratively, the number of the differential pressure sensors 5 and the number of the limiting plates 831 are two, one limiting plate 831 is disposed above each differential pressure sensor 5, and the two limiting plates 831 are mounted on the air passage block 7 through the same connecting plate 832.

Illustratively, continuing to refer to fig. 8, differential pressure sensor 5 has a ceramic board 511, and ceramic board 511 serves as an important semiconductor component. The stopper plate 831 has a through groove 831a, and the through groove 831a is located above the ceramic plate 511 and serves to escape the ceramic plate 511.

The contour of the through groove 831a is at least larger than the contour shape of the ceramic board 511, and when the differential pressure sensor 5 is ejected upward, the ceramic board 511 enters the through groove 831a, so that the limiting plate 831 cannot abut against the ceramic board 511, thereby protecting the ceramic board 511 and avoiding affecting the semiconductor performance of the ceramic board 511.

It is to be understood that the mounting positions of the first solenoid valve 61 and the second solenoid valve 62 on the air passage block 7 are not limited, and may be mounted on the same side surface or different side surfaces.

Illustratively, a first solenoid valve 61 is mounted to one of the sides of the air passage block 7, and a second solenoid valve 62 is mounted to the other side of the air passage block 7. That is, the first solenoid valve 61 and the second solenoid valve 62 are installed at different sides of the air path block 7, so that the space around the air path block 7 can be sufficiently utilized to facilitate the assembly of the first solenoid valve 61 and the second solenoid valve 62.

The specific type of the first electromagnetic valve 61 is not limited.

For example, the first electromagnetic valve 61 is a two-position three-way electromagnetic valve, please refer to fig. 9, three first valve ports are disposed on the same side surface of the first electromagnetic valve 61, it should be noted that a process channel is disposed inside the first electromagnetic valve 61, a valve core is disposed in the process channel, and a communication state between the first valve ports is realized by movement of the valve core.

With reference to fig. 7, the air channel block 7 has a first flow channel, a second flow channel and a third flow channel (not shown), wherein the first flow channel forms a first sampling hole 71a for sampling the anesthetic gas sampling end 512 on the surface of the air channel block 7, and the other end forms a first hole 71c (see fig. 7) on the surface (for example, the side surface) of the air channel block 7; one end of the second flow channel 702 is abutted against the anesthetic gas outlet of the drug reservoir 11, and the other end forms a second hole 71d (see fig. 7) in the surface (for example, a side surface) of the gas passage block 7; one end of the third flow passage forms an atmosphere inlet on the surface of the air channel block 7, and the other end forms a third hole 71f (refer to fig. 7) on the surface (for example, a side surface) of the air channel block 7, and the first hole 71C, the second hole 71d, and the third hole 71f are respectively in sealing butt joint with a corresponding first valve port, and are fixed on the air channel block 7 through a screw 9C, wherein the first valve port in butt joint with the third hole 71f is a first zero calibration valve port.

Further, the three first valve ports are disposed on the same side surface of the first solenoid valve 61, and the first hole 71c, the second hole 71d, and the third hole 71f are also disposed on the same side surface of the air passage block. In this embodiment, the first electromagnetic valve 61 and the air circuit block 7 are directly butted without being connected through a pipeline, and the structure is simple and compact.

When the first electromagnetic valve 61 is in the sampling working position, two first valve ports 61a of all the first valve ports 61a except the first zero calibration valve port are communicated, and the anesthetic gas sampling end 512 is communicated with the anesthetic gas output port through the first flow passage, the first electromagnetic valve 61 and the second flow passage; when the first electromagnetic valve is in the zero calibration working position, the first valve port 61a butted with the first hole 71c is communicated with the first zero calibration valve port, and the anesthetic gas sampling end 512 is communicated with the atmosphere through the first flow passage, the first electromagnetic valve 61 and the third flow passage.

For example, the second electromagnetic valve 62 is a two-position three-way electromagnetic valve, three second valve ports 62a are provided on the second electromagnetic valve 62, referring to fig. 9, the air channel block 7 has a fourth flow channel 704, a fifth flow channel 705, and a sixth flow channel 706, wherein one end of the fourth flow channel 704 forms a second sampling hole 71b for sampling the carrier gas sampling end 513 on a surface (for example, a side surface) of the air channel block 7, and the other end forms a fourth hole 71g on the surface (for example, the side surface) of the air channel block 7; one end of the fifth flow channel 705 is communicated with the carrier gas source, and the other end forms a fifth hole 71h on the surface (for example, a side surface) of the gas path block 7; one end of the sixth flow passage 706 forms an atmosphere inlet on the side surface of the air path block 7, and the other end forms a sixth hole 71k on the side surface of the air path block 7, and the fourth hole 71g, the fifth hole 71h and the sixth hole 71k are respectively in sealing butt joint with a corresponding second valve port 62a and are fixed on the air path block 7 through a screw 9D, wherein the second valve port 62a in butt joint with the sixth hole 71k is a second zeroing valve port.

Further, the three second ports 62a are disposed on the same side surface of the second solenoid valve 62, and the fourth hole 71g, the fifth hole 71h, and the sixth hole 71k are also disposed on the same side surface of the air passage block.

In this embodiment, the second electromagnetic valve 62 is directly butted with the air path block 7, and does not need to be connected through a pipeline, so that the structure is simple and compact.

When the second electromagnetic valve 62 is in the sampling working position, two of the second valve ports 62a except the second zeroing valve port of all the second valve ports 62a are communicated, and the carrier gas sampling end 513 is communicated with the carrier gas source through the fourth flow passage 704, the second electromagnetic valve 62 and the fifth flow passage 705; when the second solenoid valve 62 is in the zeroing operating position, the second port 62a abutting against the fourth hole 71g is communicated with the second zeroing port, and the carrier gas sampling port 513 is communicated with the atmosphere through the fourth flow passage 704, the second solenoid valve 62 and the sixth flow passage 706.

The anesthetic vaporizer disclosed by the embodiment of the application can be applied to the vaporization of isoflurane, sevoflurane, enflurane and desflurane anesthetics.

The embodiment of the application provides an anesthesia machine, includes:

the anesthesia machine host is provided with an evaporator connecting seat and an air supply system;

and the anesthetic vaporizer of any embodiment of this application, anesthetic vaporizer install on the vaporizer connecting seat, and gas supply system is connected with anesthetic vaporizer to make anesthetic vaporizer can provide anesthetic gas to the patient through breathing circuit.

The anesthesia machine of the embodiment of the application can automatically zero the differential pressure sensor, and is simple in structure and low in cost.

In the description of the present application, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present application. In this application, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of different embodiments or examples described herein may be combined by one skilled in the art without contradiction.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (20)

1. An anesthetic vaporizer, comprising:

a medicine pool;

the inlet of the anesthesia gas circuit is communicated with the medicine pool;

the tail end of the gas-carrying gas path is communicated with the tail end of the anesthesia gas path;

the pressure difference sensor is provided with at least two sampling ends, the sampling ends comprise an anesthetic gas sampling end and a carrier gas sampling end, the anesthetic gas sampling end is connected with the anesthetic gas circuit through a first branch, and the carrier gas sampling end is connected with the carrier gas circuit through a second branch;

the first solenoid valve is arranged on the first branch and provided with a first zero calibration valve port communicated with the atmosphere, and the first solenoid valve comprises a sampling working position for communicating the first branch and a zero calibration working position for closing the first branch and communicating the anesthetic gas sampling end with the atmosphere through the first zero calibration valve port;

the second electromagnetic valve is arranged on the second branch and is provided with a second zero setting valve port communicated with the atmosphere, the second electromagnetic valve comprises a sampling working position for communicating the second branch, and a zero setting working position for closing the second branch and communicating the carrier gas sampling end with the atmosphere through the second zero setting valve port;

and the control unit is used for controlling the first electromagnetic valve and the second electromagnetic valve to switch working positions.

2. The anesthetic vaporizer as claimed in claim 1, wherein the differential pressure sensors are two in number, two of the differential pressure sensors are disposed in parallel between the first branch and the second branch, the anesthetic gas sampling ends of the two differential pressure sensors are communicated through a third branch, and the carrier gas sampling ends of the two differential pressure sensors are communicated through a fourth branch.

3. The anesthetic vaporizer of claim 1 wherein the anesthetic vaporizer comprises an air circuit block; the first solenoid valve is installed to one of the side surfaces of the air path block, and the second solenoid valve is installed to the other side surface of the air path block.

4. The anesthetic vaporizer of claim 1, wherein the anesthetic vaporizer comprises an air passage block; the first electromagnetic valve is a three-way electromagnetic valve, three first valve ports are arranged on the first electromagnetic valve, the air channel block is provided with a first flow channel, a second flow channel and a third flow channel, wherein one end of the first flow channel forms a first sampling hole for sampling the anesthetic gas sampling end on the surface of the air channel block, and the other end of the first flow channel forms a first hole on the surface of the air channel block; one end of the second flow passage is butted with an anesthetic gas output port of the medicine pool, and the other end of the second flow passage forms a second hole on the surface of the gas path block; one end of the third flow channel forms an atmosphere inlet on the side surface of the air path block, and the other end of the third flow channel forms a third hole on the surface of the air path block, wherein the first hole, the second hole and the third hole are respectively in sealing butt joint with one corresponding first valve port; the first valve port in butt joint with the third hole is a first zero calibration valve port.

5. The anesthetic vaporizer of claim 4, wherein when the first solenoid valve is in a sampling working position, two of the first valve ports except the first zero calibration valve port are communicated, and the anesthetic gas sampling port is communicated with the anesthetic gas output port via the first flow passage, the first solenoid valve, and the second flow passage; when the first electromagnetic valve is in a zero calibration working position, the first valve port butted with the first hole is communicated with the first zero calibration valve port, and the anesthetic gas sampling end is communicated with the atmosphere through the first flow passage, the first electromagnetic valve and the third flow passage.

6. The anesthetic vaporizer of claim 1, wherein the anesthetic vaporizer comprises an air passage block; the second electromagnetic valve is a three-way electromagnetic valve, three second valve ports are arranged on the second electromagnetic valve, the gas path block is provided with a fourth flow channel, a fifth flow channel and a sixth flow channel, wherein one end of the fourth flow channel forms a second sampling hole for sampling the carrier gas sampling end on the surface of the gas path block, and the other end of the fourth flow channel forms a fourth hole on the surface of the gas path block; one end of the fifth flow channel is communicated with a carrier gas source, and the other end of the fifth flow channel forms a fifth hole on the surface of the gas path block; one end of the sixth flow passage forms an atmosphere inlet on the surface of the air path block, the other end of the sixth flow passage forms a sixth hole on the side surface of the air path block, the fourth hole, the fifth hole and the sixth hole are respectively in sealing butt joint with one corresponding second valve port, and the second valve port in butt joint with the sixth hole is a second zeroing valve port.

7. The anesthetic vaporizer of claim 6, wherein when the second solenoid valve is in the sampling working position, two of the second valve ports except the second zeroing valve port are communicated, and the carrier gas sampling end is communicated with the carrier gas source through the fourth flow passage, the second solenoid valve, the fifth flow passage; when the second electromagnetic valve is in a zero calibration working position, the second valve port butted with the fourth hole is communicated with the second zero calibration valve port, and the carrier gas sampling end is communicated with the atmosphere through the fourth flow passage, the second electromagnetic valve and the sixth flow passage.

8. The anesthetic vaporizer as claimed in claim 1, comprising an air channel block, wherein a plurality of flow channels are provided inside the air channel block, the flow channels form at least two sampling holes on a surface of the air channel block, one of the flow channels forms a first sampling hole on the surface of the air channel block, the other flow channel forms a second sampling hole on the surface of the air channel block, the differential pressure sensor is mounted on the air channel block, the anesthetic gas sampling end is columnar and inserted into the first sampling hole, and the carrier gas sampling end is columnar and inserted into the second sampling hole.

9. The anesthetic vaporizer of claim 8, comprising a plurality of sealing cartridges; the sampling end of at least one differential pressure sensor is sealed with the sampling hole through two sealing sleeves, wherein one sealing sleeve is sleeved on the anesthetic gas sampling end and seals the anesthetic gas sampling end and the hole wall of the first sampling hole; the other sealing sleeve is sleeved on the carrier gas sampling end and seals the carrier gas sampling end and the hole wall of the second sampling hole; two sampling ends of the same differential pressure sensor are arranged in parallel, and the two sealing sleeves are connected with each other at the part between the two sampling ends.

10. The anesthetic vaporizer of claim 9, wherein both ends of each sealing sleeve are asymmetric, one end of the sealing sleeve near the end surface of the sampling end is a first end, one end of the sealing sleeve far away from the end surface of the sampling end is a second end, and the two sealing sleeves are connected with each other at the second end of the sealing sleeve.

11. The anesthetic vaporizer of claim 10, wherein each of the sealing sleeves is frustoconical, the first end having a diameter smaller than a diameter of the second end.

12. The anesthetic vaporizer of claim 9, wherein the sealing boot comprises, in order from the second end to the first end, a first section, a sealing section, and a second section, the sealing section having an outer diameter larger than a bore diameter of the sampling hole at a portion corresponding to the sealing section.

13. The anesthetic vaporizer of claim 1 comprising a mounting substrate to which the differential pressure sensor is attached, the mounting substrate being mounted to a gas circuit block; the mounting substrate is provided with at least two through holes, the carrier gas sampling end penetrates through one of the through holes, and the anesthetic gas sampling end penetrates through the other through hole.

14. The anesthetic vaporizer of claim 1, wherein the differential pressure sensor is mounted on an air path block, the anesthetic vaporizer comprises a limiting support, the limiting support comprises a limiting plate and a connecting plate, the limiting plate is arranged on a side of the differential pressure sensor opposite to the sampling end, the limiting plate is not in contact with the differential pressure sensor, and the connecting plate is connected with the air path block.

15. The anesthetic vaporizer of claim 14, wherein the limit plate has a through slot, and the differential pressure sensor has a ceramic plate, the through slot being located above the ceramic plate and configured to escape the ceramic plate.

16. The anesthetic vaporizer of claim 1 wherein a carrier gas vapor lock element is disposed on the carrier gas circuit and is located at a connection point of the second branch and the carrier gas circuit and between the connection point of the carrier gas circuit and the anesthetic gas circuit.

17. The anesthetic vaporizer of claim 1, wherein a cone valve is disposed on the anesthetic gas path, the cone valve is disposed between a connection point of the first branch and the anesthetic gas path and a connection point of the anesthetic gas path and the carrier gas path, and the anesthetic vaporizer includes a hand wheel which is linked with the cone valve to adjust a gas resistance of the cone valve.

18. The anesthetic vaporizer of claim 1, comprising a hand wheel provided with a zero sensor, the zero sensor being electrically connected to the control unit, wherein the control unit controls the first solenoid valve and the second solenoid valve to switch from the sampling operating position to the zeroing operating position when the zero sensor detects that the hand wheel is switched from a zero position to a non-zero position.

19. The anesthetic vaporizer of claim 1, having a power-on self-test mode in which the control unit controls the first solenoid valve and the second solenoid valve to switch the zero calibration operating position from the sampling operating position.

20. An anesthesia machine, comprising:

the main machine of the anesthesia machine is provided with an evaporator connecting seat and an air supply system;

and an anesthetic vaporizer according to any of claims 1-19, said anesthetic vaporizer being mounted on said vaporizer attachment base, said gas supply system being connected to said anesthetic vaporizer to enable said anesthetic vaporizer to supply anesthetic gas to a patient via a breathing circuit.

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