High-pressure quantitative drug delivery device and delivery method

Abstract

A high-pressure quantitative drug delivery device and delivery method. The high-pressure quantitative drug delivery device comprises: a constant-pressure gas source (1), a plunger pump (4), a drug storage tank (2), and a vaporization core (7). The constant-pressure gas source (1) is used for introducing constant-pressure gas into the drug storage tank (2); the drug storage tank (2) is pre-filled with an anesthetic; a plunger pump upper-cavity drug inlet solenoid valve (3) and a plunger pump lower-cavity drug inlet solenoid valve (10) are respectively provided on tubes connecting the plunger pump (4) and the drug storage tank (2); and a plunger pump upper-cavity drug injection port back pressure valve (5), a plunger pump upper-cavity drug injection port solenoid valve (6), a plunger pump lower-cavity drug injection port back pressure valve (9), and a plunger pump lower-cavity drug injection port solenoid valve (8) are respectively provided on a delivery tube of the plunger pump (4). By means of coordinated opening and closing of the solenoid valves and the back pressure valves, the anesthetic is drawn from the drug storage tank (2), and precisely and quantitatively delivered to the vaporization core (7) of an electronically controlled vaporizer.

Description

High-pressure quantitative drug delivery device and delivery method Technical Field

[0001] This application claims priority to Chinese patent application No. 202311794280.3, entitled “A High-Pressure Quantitative Drug Delivery Device and Delivery Method,” filed on December 25, 2023, and this application is incorporated herein by reference.

[0002] Technical Field

[0003] The present invention belongs to the technical field of medical equipment, and in particular relates to a high-pressure quantitative drug delivery device and a delivery method. Background Art

[0004] Existing technology uses high-pressure nozzles to achieve quantitative anesthetic delivery. Its technical principle is similar to that of engine fuel injectors. Under constant pressure, the nozzle sprays a roughly consistent amount of drug each time it switches on and off. The delivery rate is controlled by controlling the nozzle's switching frequency. However, this pulsed delivery method does not deliver a continuous anesthetic. After passing through the evaporation core, the drug concentration fluctuates in a pulsed manner. Especially at low concentrations, the concentration of the drug at the outlet of the electronically controlled evaporator can fluctuate significantly.

[0005] Furthermore, commonly used anesthetics such as sevoflurane, isoflurane, and desflurane are all volatile gases with low boiling points. For example, the boiling point of desflurane is 23.5°C. At high temperatures (i.e., above the boiling point), the volatilization of liquid anesthetics causes the pressure in the plunger pump to increase, forcing the liquid anesthetic out of the pump and causing abnormal output from the plunger pump.

[0006] Summary of the Invention

[0007] The purpose of the present invention is to overcome the defects of the prior art and to provide a high-pressure quantitative drug delivery device and a drug delivery method.

[0008] In order to achieve the above-mentioned object, the present invention proposes a high-pressure quantitative drug delivery device, comprising: a constant pressure gas source, a plunger pump, a drug storage tank and an evaporation core; wherein,

[0009] The constant pressure gas source is used to supply constant pressure gas into the medicine storage tank;

[0010] The medicine storage tank is pre-loaded with anesthetic;

[0011] The pipeline connecting the plunger pump and the medicine storage tank is respectively provided with an electromagnetic valve for the upper medicine inlet of the plunger pump and an electromagnetic valve for the lower medicine inlet of the plunger pump; the output pipeline of the plunger pump is respectively provided with a back pressure valve for the upper medicine injection port of the plunger pump, an electromagnetic valve for the upper medicine injection port of the plunger pump, a back pressure valve for the lower medicine injection port of the plunger pump and an electromagnetic valve for the lower medicine injection port of the plunger pump; by the coordinated opening and closing of the above-mentioned electromagnetic valves and back pressure valves, anesthetics are drawn from the medicine storage tank and accurately and quantitatively output to the evaporation core of the electronically controlled evaporator.

[0012] Preferably, the medicine storage tank includes a medicine storage tank medicine inlet, a medicine storage tank body, a medicine storage tank medicine outlet and a constant pressure air source air inlet, wherein:

[0013] The medicine inlet of the medicine storage tank and the constant pressure air source inlet are both located at the top of the medicine storage tank body. The medicine inlet of the medicine storage tank is used for adding medicine and is closed and sealed after adding medicine; the constant pressure air source inlet is connected to the constant pressure air source; the medicine outlet of the medicine storage tank is located at the bottom of the medicine storage tank body, and is connected to the solenoid valve of the upper cavity medicine inlet of the plunger pump and the medicine inlet of the lower cavity of the plunger pump.

[0014] Preferably, the plunger pump includes a plunger rod and a plunger pump body, the plunger rod is a stepped rod, consisting of a thin rod and a thick rod, the thin rod extends out of the plunger pump body and is connected to the linear drive assembly, the thick rod is located inside the plunger pump body, a plunger pump sealing ring is provided in the plunger pump body, the plunger rod moves up and down in the plunger pump body under the control of the linear drive assembly, the outer circle of the thick rod is close to the plunger pump sealing ring, and together with the plunger pump sealing ring, the plunger pump body is separated into an upper chamber and a lower chamber of the plunger pump.

[0015] Preferably, a plunger pump upper chamber drug inlet is provided at the top of the plunger pump upper chamber, which is connected to the plunger pump upper chamber drug inlet solenoid valve; a plunger pump upper chamber drug injection port is provided at the bottom of the plunger pump upper chamber, which is connected in series with the plunger pump upper chamber drug injection port back pressure valve and the plunger pump upper chamber drug injection port solenoid valve in sequence.

[0016] Preferably, a plunger pump lower chamber drug inlet is provided at the top of the plunger pump lower chamber, which is connected to the plunger pump lower chamber drug inlet solenoid valve; a plunger pump lower chamber drug injection port is provided at the bottom of the plunger pump lower chamber, which is connected in series with the plunger pump lower chamber drug injection port back pressure valve and the plunger pump lower chamber drug injection port solenoid valve in sequence.

[0017] Preferably, the evaporation core is connected in parallel with the solenoid valve of the upper chamber injection port of the plunger pump and the solenoid valve of the lower chamber injection port of the plunger pump.

[0018] Preferably, the pressure value of the constant pressure gas source satisfies: the pressure in the medicine storage tank reaches above the saturated vapor pressure of the corresponding anesthetic at the working temperature of the evaporation core.

[0019] Preferably, the back pressure valve at the upper cavity injection port of the plunger pump and the back pressure valve at the lower cavity injection port of the plunger pump are both sealed to ensure that the anesthetic in the plunger pump cavity does not leak under the pressure value of the constant pressure gas source.

[0020] On the other hand, the present invention provides a high-pressure quantitative drug delivery method, which is implemented based on the above-mentioned device, and the method includes:

[0021] Step 1) introducing constant pressure gas into the medicine storage tank through a constant pressure gas source;

[0022] Step 2) Open the solenoid valves for the upper and lower drug inlets of the plunger pump, and close the solenoid valves for the upper and lower drug injection ports of the plunger pump; start the plunger pump, and the plunger rod moves up and down within the plunger pump body under the control of the linear drive assembly to fill the plunger pump with high-pressure anesthetic;

[0023] Step 3) Open the solenoid valve of the upper cavity drug inlet of the plunger pump and the solenoid valve of the lower cavity drug inlet of the plunger pump, and close the solenoid valve of the upper cavity drug inlet of the plunger pump and the solenoid valve of the lower cavity drug inlet of the plunger pump to enter the lower cavity drug injection state; the back pressure valve of the lower cavity drug injection port of the plunger pump is in the closed state, and the plunger rod moves downward in the plunger pump body under the control of the linear drive assembly, and the back pressure valve of the lower cavity drug injection port of the plunger pump is opened, and the anesthetic is injected into the evaporation core, and the amount of anesthetic injected corresponds to the amount of downward pressure of the plunger rod;

[0024] Step 4) Open the solenoid valve of the plunger pump's lower cavity inlet and the solenoid valve of the plunger pump's upper cavity injection port, and close the solenoid valve of the plunger pump's upper cavity inlet and the solenoid valve of the plunger pump's lower cavity injection port, entering the upper cavity injection state; the back pressure valve of the plunger pump's upper cavity injection port is in the closed state, and under the control of the linear drive assembly, the plunger rod moves upward in the plunger pump body, the back pressure valve of the plunger pump's upper cavity injection port opens, and the anesthetic is injected into the evaporation core, and the amount of anesthetic injected corresponds to the amount of downward pressure on the plunger rod;

[0025] Step 5) repeats steps 3) and 4) to achieve continuous and accurate output of anesthetic from the electronically controlled vaporizer at high temperature.

[0026] Compared with the prior art, the advantages of the present invention are:

[0027] By introducing a constant pressure gas source into the drug storage tank, adding a back pressure valve at the output end of the plunger pump, and reasonably setting the gas pressure of the constant pressure gas source, the electronically controlled evaporator can achieve accurate quantitative output of different anesthetics at high temperatures (above the boiling point of the anesthetics) without generating pulsed fluctuations in anesthetic concentrations. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a schematic diagram of a high-pressure quantitative drug delivery device according to the present invention;

[0029] FIG2 is a structural diagram of a high-pressure quantitative drug delivery device;

[0030] Figure 3 is a schematic structural diagram of the medicine storage tank;

[0031] Figure 4 is a schematic diagram of the plunger pump structure.

[0032] Reference numerals

[0033] 1. Constant pressure gas source 2. Medicine storage tank

[0034] 3. Solenoid valve for medicine inlet of upper cavity of plunger pump 4. Plunger pump

[0035] 5. Back pressure valve for the upper injection port of the plunger pump 6. Solenoid valve for the upper injection port of the plunger pump

[0036] 7. Evaporation core 8. Solenoid valve for the injection port of the lower cavity of the plunger pump

[0037] 9. Back pressure valve for the medicine injection port of the lower cavity of the plunger pump; 10. Solenoid valve for the medicine inlet of the lower cavity of the plunger pump

[0038] 201, medicine inlet of medicine storage tank 202, medicine storage tank body;

[0039] 203. Drug storage tank outlet 204. Constant pressure gas source inlet

[0040] 401, linear drive assembly 402, plunger rod

[0041] 403, plunger pump body 404, plunger pump upper chamber

[0042] 405, plunger pump upper cavity injection port 406, plunger pump sealing ring

[0043] 407, plunger pump lower chamber 408, plunger pump lower chamber injection port

[0044] 409, plunger pump lower cavity medicine inlet 410, plunger pump upper cavity medicine inlet DETAILED DESCRIPTION

[0045] Connecting a constant-pressure gas source to the drug storage tank increases the pressure inside the tank to a level greater than the saturated vapor pressure of the anesthetic at the current ambient temperature, ensuring the drug's stability. Connecting a back-pressure valve to the plunger pump's outlet ensures that the anesthetic inside the pump is not forced out when the plunger pump is not operating. At the same time, when the plunger pump is operating, the internal pressure is maintained, ensuring the drug's stability and enabling precise delivery of the drug. The principle is shown in Figure 1.

[0046] Action sequence and detailed principles:

[0047] (1) A constant pressure gas source introduces high-pressure gas into the drug storage tank, raising the internal pressure of the tank to above the saturated vapor pressure of the corresponding anesthetic at the operating temperature of the evaporator (the ambient pressure is lower than the saturated vapor pressure of the liquid, and the liquid will boil).

[0048] (2) Open solenoid valves ① and ②, close solenoid valves ③ and ④, start the plunger pump, and the plunger rod moves up and down to fill the plunger pump with high-pressure anesthetic.

[0049] (3) Open solenoid valves ① and ④, close solenoid valves ② and ③, and enter the lower chamber injection state. Since the back pressure valve opening pressure is greater than the anesthetic pressure in the pump, the back pressure valve is in the closed state and the anesthetic will not be injected. The plunger pump starts, and the plunger rod moves downward. Due to the incompressibility of the liquid, the pressure in the lower chamber of the pump quickly rises to the back pressure valve opening pressure. The back pressure valve is opened, and the anesthetic is injected. The injection amount corresponds to the amount of pressure on the plunger rod. The role of the back pressure valve in this process is to ensure the constant pressure in the pump when the plunger pump is working, maintain the stability of the anesthetic state, and achieve stable output of anesthetic.

[0050] (4) Open solenoid valves ②③ and close solenoid valves ①④ to enter the upper chamber injection state. The back pressure valve ensures a constant pressure state in the pump, and the plunger pump controls the precise injection of liquid anesthetic. The principle is the same as action (3).

[0051] (5) Repeating steps (3) and (4) can achieve continuous and accurate output of anesthetics from the electronically controlled vaporizer at high temperature.

[0052] The technical effects are as follows:

[0053] By introducing a constant pressure gas source into the drug storage tank, adding a back pressure valve at the output end of the plunger pump, and reasonably setting the gas pressure of the constant pressure gas source, the electronically controlled evaporator can achieve accurate quantitative output of different anesthetics at high temperature (above the boiling point of the anesthetic).

[0054] The technical solution of the present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0055] Example 1

[0056] As shown in FIG2 , embodiment 1 of the present invention provides a high-pressure quantitative drug delivery device.

[0057] The main components include: constant pressure gas source 1, drug storage tank 2, plunger pump upper chamber drug inlet solenoid valve 3, plunger pump 4, plunger pump upper chamber injection port back pressure valve 5, plunger pump upper chamber injection port solenoid valve 6, evaporation core 7, plunger pump lower chamber injection port solenoid valve 8, plunger pump lower chamber injection port back pressure valve 9, plunger pump lower chamber injection port solenoid valve 10. All components are connected by pipes.

[0058] As shown in FIG3 , the medicine storage tank 2 comprises a medicine storage tank medicine inlet 201, a medicine storage tank body 202, a medicine storage tank medicine outlet 203, and a constant pressure air source inlet 204. The medicine storage tank medicine inlet 201 and the constant pressure air source inlet 204 are both located at the top of the medicine storage tank body 202. The medicine storage tank 2 is filled with medicine through the top medicine storage tank medicine inlet 201, and the medicine inlet is closed after filling to seal it. The constant pressure air source inlet 204 is connected to the constant pressure air source 1. The medicine storage tank medicine outlet 203 is located at the bottom of the medicine storage tank body 202 and is connected to the plunger pump upper chamber medicine inlet solenoid valve 3 and the plunger pump lower chamber medicine inlet 10.

[0059] The plunger pump 4 is shown in FIG4 . It comprises a linear drive assembly 401, a plunger rod 402, a plunger pump body 403, an upper plunger pump chamber 404, a plunger pump sealing ring 406, and a lower plunger pump chamber 407. The plunger rod 402 is a stepped rod consisting of a thin rod and a thick rod. The thin rod extends out of the plunger pump body 403 and is connected to the linear drive assembly 401. The thick rod is located inside the plunger pump body 403. During the movement of the plunger rod 402, the outer circle of the thick rod is in close contact with the plunger pump sealing ring 406, and together with the plunger pump sealing ring 406, the plunger pump body 403 is divided into an upper plunger pump chamber 404 and a lower plunger pump chamber 407. The linear drive assembly 401 can control the plunger rod 402 to move up and down inside the plunger pump body 403. The linear drive assembly 401, such as a linear servo motor, a motor screw nut mechanism, etc., will suffice as long as it can achieve this function.

[0060] The plunger pump upper chamber 404 is provided with a plunger pump upper chamber drug inlet 410 at the top and is connected to the plunger pump upper chamber drug inlet solenoid valve 3. The plunger pump upper chamber drug injection port 405 is provided at the bottom and is connected in series with the plunger pump upper chamber drug injection port back pressure valve 5 and the plunger pump upper chamber drug injection port solenoid valve 6 in sequence.

[0061] The plunger pump lower chamber 407 is provided with a plunger pump lower chamber drug inlet 409 at the top, and is connected to the plunger pump upper chamber drug inlet solenoid valve 10. The plunger pump lower chamber drug injection port 408 is provided at the bottom, and is connected in series with the plunger pump lower chamber drug injection port back pressure valve 9 and the plunger pump lower chamber drug injection port solenoid valve 8 in sequence. The sealing performance of the plunger pump upper chamber drug injection port back pressure valve 5 and the plunger pump lower chamber drug injection port back pressure valve 9: Under the pressure value of the constant pressure gas source, the back pressure valve should ensure that the anesthetic in the plunger pump 4 chamber does not leak.

[0062] The evaporation core 7 is connected in parallel with the electromagnetic valve 6 at the upper chamber injection port of the plunger pump and the electromagnetic valve 8 at the lower chamber injection port of the plunger pump.

[0063] Example 2

[0064] Example 2 of the present invention provides a high-pressure quantitative drug delivery method, which is implemented based on the device of Example 1. The method includes:

[0065] Step 1) introducing constant pressure gas into the medicine storage tank 2 through a constant pressure gas source 1;

[0066] Step 2) Open the plunger pump's upper chamber drug inlet solenoid valve 3 and the plunger pump's lower chamber drug inlet solenoid valve 10, and close the plunger pump's upper chamber drug injection solenoid valve 6 and the plunger pump's lower chamber drug injection solenoid valve 8; start the plunger pump 4, and the plunger rod 402 moves up and down within the plunger pump body 403 under the control of the linear drive assembly 401, filling the plunger pump 4 with high-pressure anesthetic;

[0067] Step 3) Open the solenoid valve 3 for the upper chamber drug inlet of the plunger pump and the solenoid valve 8 for the lower chamber drug injection port of the plunger pump, and close the solenoid valve 6 for the upper chamber drug injection port of the plunger pump and the solenoid valve 10 for the lower chamber drug inlet of the plunger pump, thereby entering the lower chamber drug injection state; the back pressure valve 9 for the lower chamber drug injection port of the plunger pump is closed, and under the control of the linear drive component 401, the plunger rod 402 moves downward in the plunger pump body 403, and the back pressure valve 9 for the lower chamber drug injection port of the plunger pump is opened, and the anesthetic is injected into the evaporation core, and the amount of anesthetic injected corresponds to the amount of downward pressure of the plunger rod 402;

[0068] Step 4) Open the plunger pump lower chamber drug inlet solenoid valve 10 and the plunger pump upper chamber drug injection port solenoid valve 6, close the plunger pump upper chamber drug inlet solenoid valve 3 and the plunger pump lower chamber drug injection port solenoid valve 8, and enter the upper chamber drug injection state; the plunger pump upper chamber drug injection port back pressure valve 5 is closed, under the control of the linear drive assembly 401, the plunger rod 402 moves upward in the plunger pump body 403, the plunger pump upper chamber drug injection port back pressure valve 5 opens, and the anesthetic is injected into the evaporation core 7, and the amount of anesthetic injected corresponds to the amount of downward pressure of the plunger rod 402;

[0069] Step 5) repeats steps 3) and 4) to achieve continuous and accurate output of anesthetic from the electronically controlled vaporizer at high temperature.

[0070] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and are intended to be encompassed by the claims of the present invention.

Claims

1. A high-pressure quantitative drug output device, characterized in that, Comprising: A constant-pressure gas source (1), a plunger pump (4), a medicine storage tank (2), and an evaporation core (7); wherein, The constant-pressure gas source (1) is used to introduce constant-pressure gas into the interior of the medicine storage tank (2); The medicine storage tank (2) is pre-filled with anesthetic; On the pipeline connecting the plunger pump (4) and the medicine storage tank (2), a solenoid valve (3) for the upper chamber inlet of the plunger pump and a solenoid valve (10) for the lower chamber inlet of the plunger pump are respectively provided. On the output pipeline of the plunger pump (4), a back-pressure valve (5) for the upper chamber injection port of the plunger pump, a solenoid valve (6) for the upper chamber injection port of the plunger pump, a back-pressure valve (9) for the lower chamber injection port of the plunger pump, and a solenoid valve (8) for the lower chamber injection port of the plunger pump are respectively provided. Through the coordinated opening and closing of the above solenoid valves and back-pressure valves, anesthetic is sucked from the medicine storage tank (2) and precisely and quantitatively output to the evaporation core (7) of the electronic control evaporator.

2. The high-pressure quantitative drug output device according to claim 1, wherein The medicine storage tank (2) includes a medicine storage tank inlet (201), a medicine storage tank body (202), a medicine storage tank outlet (203), and a constant-pressure gas source inlet (204), wherein, Both the medicine storage tank inlet (201) and the constant-pressure gas source inlet (204) are located at the top of the medicine storage tank body (202). The medicine storage tank inlet (201) is used for adding medicine, and is closed and sealed after adding medicine; the constant-pressure gas source inlet (204) is connected to the constant-pressure gas source (1); the medicine storage tank outlet (203) is located at the bottom of the medicine storage tank body (202) and is connected to the solenoid valve (3) for the upper chamber inlet of the plunger pump and the lower chamber inlet (10) of the plunger pump.

3. The high-pressure quantitative drug output device according to claim 1, characterized in that, The plunger pump (4) includes a plunger rod (402) and a plunger pump body (403). The plunger rod (402) is a stepped rod, composed of a thin rod and a thick rod. The thin rod extends out of the plunger pump body (403) and is connected to a linear drive assembly (401). The thick rod is located inside the plunger pump body (403). A plunger pump seal ring (406) is provided inside the plunger pump body (403). Under the control of the linear drive assembly (401), the plunger rod (402) moves up and down inside the plunger pump body (403). The outer circle of the thick rod closely adheres to the plunger pump seal ring (406), and the plunger pump body (403) is separated into a plunger pump upper chamber (404) and a plunger pump lower chamber (407) by the plunger pump seal ring (406).

4. The high-pressure quantitative drug output device according to claim 3, characterized in that At the top of the plunger pump upper chamber (404), a plunger pump upper chamber inlet (410) is provided, which is connected to the solenoid valve (3) for the upper chamber inlet of the plunger pump. At the bottom of the plunger pump upper chamber (404), a plunger pump upper chamber injection port (405) is provided, which is connected in series with the back-pressure valve (5) for the upper chamber injection port of the plunger pump and the solenoid valve (6) for the upper chamber injection port of the plunger pump in sequence.

5. The high-pressure quantitative drug output device according to claim 3, characterized in that, At the top of the plunger pump lower chamber (407), a plunger pump lower chamber inlet (409) is provided, which is connected to the solenoid valve (10) for the lower chamber inlet of the plunger pump. At the bottom of the plunger pump lower chamber (407), a plunger pump lower chamber injection port (408) is provided, which is connected in series with the back-pressure valve (9) for the lower chamber injection port of the plunger pump and the solenoid valve (8) for the lower chamber injection port of the plunger pump in sequence.

6. The high-pressure quantitative drug output device according to claim 1, wherein The evaporation core (7) is connected in parallel with the solenoid valve (6) for the upper chamber injection port of the plunger pump and the solenoid valve (8) for the lower chamber injection port of the plunger pump.

7. The high-pressure quantitative drug output device according to claim 1, characterized in that The pressure value of the constant-pressure gas source (1) satisfies that the pressure in the medicine storage tank (2) reaches above the saturated vapor pressure of the anesthetic corresponding to the working temperature of the evaporation core (7).

8. The high-pressure quantitative drug output device according to claim 1, characterized in that, The backpressure valves (5) at the medicine injection ports of the upper chamber of the plunger pump and the backpressure valves (9) at the medicine injection ports of the lower chamber of the plunger pump are both airtight, so as to ensure that there is no leakage of the anesthetic in the cavity of the plunger pump (4) under the pressure value of the constant-pressure gas source (1).

9. A high-pressure quantitative medicine output method, implemented based on the device according to any one of claims 3-8, the method comprising: Step 1) Introduce constant-pressure gas into the interior of the medicine storage tank (2) through the constant-pressure gas source (1); Step 2) Open the solenoid valve (3) at the medicine inlet of the upper chamber of the plunger pump and the solenoid valve (10) at the medicine inlet of the lower chamber of the plunger pump, and close the solenoid valve (6) at the medicine injection port of the upper chamber of the plunger pump and the solenoid valve (8) at the medicine injection port of the lower chamber of the plunger pump; Start the plunger pump (4), and the plunger rod (402) moves up and down in the plunger pump body (403) under the control of the linear drive assembly (401) to suck the high-pressure anesthetic into the plunger pump (4); Step 3) Open the solenoid valve (3) at the medicine inlet of the upper chamber of the plunger pump and the solenoid valve (8) at the medicine injection port of the lower chamber of the plunger pump, and close the solenoid valve (6) at the medicine injection port of the upper chamber of the plunger pump and the solenoid valve (10) at the medicine inlet of the lower chamber of the plunger pump, and enter the lower chamber medicine injection state; The backpressure valve (9) at the medicine injection port of the lower chamber of the plunger pump is in the closed state. Under the control of the linear drive assembly (401), the plunger rod (402) moves downward in the plunger pump body (403), and the backpressure valve (9) at the medicine injection port of the lower chamber of the plunger pump opens, and the anesthetic is injected into the evaporation core (7), and the anesthetic injection amount corresponds to the downward pressure amount of the plunger rod (402); Step 4) Open the solenoid valve (10) at the medicine inlet of the lower chamber of the plunger pump and the solenoid valve (6) at the medicine injection port of the upper chamber of the plunger pump, and close the solenoid valve (3) at the medicine inlet of the upper chamber of the plunger pump and the solenoid valve (8) at the medicine injection port of the lower chamber of the plunger pump, and enter the upper chamber medicine injection state; The backpressure valve (5) at the medicine injection port of the upper chamber of the plunger pump is in the closed state. Under the control of the linear drive assembly (401), the plunger rod (402) moves upward in the plunger pump body (403), and the backpressure valve (5) at the medicine injection port of the upper chamber of the plunger pump opens, and the anesthetic is injected into the evaporation core (7), and the anesthetic injection amount corresponds to the downward pressure amount of the plunger rod (402); Step 5) Repeat Step 3) and Step 4) to achieve continuous and accurate output of the anesthetic of the electric control evaporator at high temperature.

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