Device and method for intravenous preparation of narcotic and anesthetic and recovery of residual liquid

Abstract

The present invention relates to the technical field of narcotic drugs, and specifically to a device for static preparation of narcotic drugs and recovery of residual liquid, comprising a sealed chamber, a motion component, a recovery system, a first clamp and a second clamp; a first syringe and a second syringe are respectively provided on the front sides of the first clamp and the second clamp; the motion component comprises a stator seat and a mover seat provided on the top of the stator seat, a telescopic cylinder is fixedly mounted on the outer wall of the top of the mover seat, and a connection is provided on the top of the output shaft of the telescopic cylinder; the first clamp comprises a first base plate, and static preparation and residual liquid recovery are achieved through the provision of a static drug equipment unit, a residual liquid and empty bottle recovery equipment unit and a volatile liquid recovery unit, etc., so that volatile liquid pollution and loss are better supplemented through an algorithm; the efficiency of static preparation and recovery is improved, and the multiple verification meter units can compare the weight changes before and after static preparation and residual liquid recovery, and obtain accuracy through calculation, with high accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of narcotic drugs, in particular to a device and method for intravenous preparation of narcotic drugs and recovery of residual liquid. Background Art

[0002] In medicine, narcotics generally refer to anesthetic drugs, which have an anesthetic effect on the central nervous system and can easily lead to physical and psychological dependence and addiction through continuous, abused, or irrational use. Commonly used anesthetic drugs include acetorphine, acetyl alphamethylfentanyl, and acemethadol.

[0003] The intravenous preparation of narcotic drugs and the recycling of residual liquid and empty bottles have always been a pain point in hospitals. Intravenous preparation personnel need to protect themselves and accurately prepare narcotic drugs. Excess liquid needs to be checked by two people and destroyed to avoid it from flowing outside and causing adverse effects. Empty bottles must be recycled and filed.

[0004] This patent proposes an automatic static preparation and residual liquid recovery equipment and core algorithm to solve the problem of accurate recovery of manually static prepared drugs, residual liquid and empty bottles. Summary of the Invention

[0005] In view of the problems in the prior art that the intravenous preparation of narcotic drugs and the recovery of residual liquid and empty bottles are likely to affect the health of medical staff, and that two people are required to check and destroy the empty bottles when recycling them, which is prone to errors and will cause adverse effects once the residual liquid leaks out, the present invention provides a device and method for intravenous preparation of narcotic drugs and the recovery of residual liquid.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A device for statically preparing narcotics and anesthetics and recovering residual liquid, characterized by comprising a sealing chamber, a motion component, a recovery system, a first clamp, and a second clamp;

[0008] A first syringe and a second syringe are respectively provided on the front sides of the first clamp and the second clamp;

[0009] The motion assembly includes a stator seat and a mover seat arranged on the top of the stator seat, a telescopic cylinder is fixedly installed on the outer wall of the top of the mover seat, and a connecting block is provided on the top of the output shaft of the telescopic cylinder;

[0010] The first fixture includes a first base plate, two groups of fixed blocks are provided on the front side of the first base plate, a sliding block is provided between the two groups of fixed blocks, and a telescopic rod is fixedly connected to the outer wall of the top of the sliding block;

[0011] A limiting rod is provided between the two groups of fixed blocks, and the sliding block passes through the limiting rod and slides along the first base plate;

[0012] The first syringe includes a syringe a and a piston rod arranged in the syringe a, and the piston rod is coupled to the sliding block; the second clamp includes a second base plate, and a clamping seat is arranged on the front side of the second base plate.

[0013] The clamping groove of the clamping seat is fixed on the inner side of the clamping seat;

[0014] The second syringe includes a syringe b, a valve is provided inside the syringe b, and transmission tubes are provided at both ends of the valve. The transmission tube near one end of the syringe b is connected to the needle at the bottom of the second syringe;

[0015] The needle tube of the second syringe is provided with a capacitor module, wherein a sensor is provided in the capacitor module, the sensor acts on the valve, and the capacitor module is used to monitor whether there is residual liquid in the medicine;

[0016] A medicine bottle is provided at the bottom of the first syringe, and an electronic scale for weighing is provided at the bottom of the medicine bottle;

[0017] The recovery system includes a recovery bottle, a recovery pump is provided on the top of the recovery bottle, a recovery pipe is provided on the top of the recovery pump, an end of the recovery pipe away from the recovery pump is connected to an air suction plate, and the air suction plate is embedded in the inner side of the top of the sealed chamber.

[0018] Beneficial effects of the present invention:

[0019] 1. The device and method for static preparation of narcotics and anesthetics and recovery of residual liquid described in the present invention, by providing a static preparation drug equipment unit, a residual liquid and empty bottle recovery equipment unit, and a volatile liquid recovery unit, etc., enable static preparation and residual liquid recovery, and better supplement volatile liquid pollution and loss through an algorithm; improve the efficiency of static preparation and recovery, and the multiple verification meter units can compare the weight changes before and after static preparation and residual liquid recovery, and obtain accuracy through calculation, with high accuracy.

[0020] 2. The device and method for static preparation of narcotics and residual liquid recovery described in the present invention, through the provision of sealed chambers and motion components, etc., realizes automation to completely replace manual labor, and conforms to the environmentally friendly use of narcotics that are dangerous, difficult to control, and pollute and harm the environment and humans. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and examples.

[0022] Figure 1 It is a schematic diagram of the front view of a device for intravenous preparation of narcotics and anesthetics and recovery of residual liquid;

[0023] Figure 2 Schematic diagram of the first overall structure of the first clamp and the second clamp;

[0024] Figure 3Schematic diagram of the second overall structure of the first clamp and the second clamp;

[0025] Figure 4 This is a schematic diagram of the working principle structure of the second syringe;

[0026] Figure 5 This is a schematic diagram of the working principle structure of the patent of this invention.

[0027] In the figure: 10, sealing chamber; 20, moving assembly; 201, stator seat; 202, mover seat; 203, telescopic cylinder; 30, medicine bottle; 40, recovery system; 401, recovery bottle; 402, recovery pipe; 403, recovery pump; 404, suction plate; 50, first clamp; 501, first substrate; 502, fixed block; 503, sliding block; 504, limiting rod; 505, telescopic rod; 60, second clamp; 601, second substrate; 602, clamping seat; 70, electronic scale; 80, first syringe; 801, syringe a; 802, piston rod; 90, second syringe; 901, syringe b; 902, valve; 903, transmission tube; 100, connecting block; 110, coupling. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0029] like Figure 1-4 As shown, a device for preparing narcotics and anesthetics and recovering residual liquid of the present invention comprises a sealing chamber 10, a moving assembly 20, a recovery system 40, a first clamp 50 and a second clamp 60;

[0030] A first syringe 80 and a second syringe 90 are respectively provided on the front side of the first clamp 50 and the second clamp 60;

[0031] The motion assembly 20 includes a stator base 201 and a mover base 202 disposed on top of the stator base 201. A telescopic cylinder 203 is fixedly mounted on the outer wall of the top of the mover base 202. A connecting block 100 is disposed on the top of the output shaft of the telescopic cylinder 203.

[0032] The first fixture 50 includes a first base plate 501 , two sets of fixed blocks 502 are provided on the front side of the first base plate 501 , a sliding block 503 is provided between the two sets of fixed blocks 502 , and a telescopic rod 505 is fixedly connected to the top outer wall of the sliding block 503 ;

[0033] The first syringe 80 includes a syringe a801 and a piston rod 802 disposed in the syringe a801, and the piston rod 802 is coupled to the sliding block 503;

[0034] The second fixture 60 includes a second base plate 601 , a clamping seat 602 is provided on the front side of the second base plate 601 , and the second syringe 90 is fixed to the inner side of the clamping seat 602 through the clamping groove of the clamping seat 602 ;

[0035] The second syringe 90 includes a syringe b901, a valve 902 is provided inside the syringe b901, and a transmission tube 903 is provided at both ends of the valve 902. The transmission tube 903 near one end of the syringe b901 is connected to the needle at the bottom of the second syringe 90;

[0036] A medicine bottle 30 is provided at the bottom of the first syringe 80, and an electronic scale 70 for weighing is provided at the bottom of the medicine bottle 30;

[0037] The recovery system 40 includes a recovery bottle 401, a recovery pump 403 is provided on the top of the recovery bottle 401, a recovery pipe 402 is provided on the top of the recovery pump 403, and an air suction plate 404 is connected to the end of the recovery pipe 402 away from the recovery pump 403. The air suction plate 404 is embedded in the top inner side of the sealed chamber 10;

[0038] A limiting rod 504 is provided between the two groups of fixed blocks 502 , and the sliding block 503 passes through the limiting rod 504 and slides along the first base plate 501 .

[0039] A slot is provided on the outer wall of the bottom of the sliding block 503 at a position corresponding to the top of the piston rod 802 for fixing the piston rod 802 .

[0040] A connecting shaft corresponding to the output shaft of the telescopic cylinder 203 is provided at the bottom of the connecting block 100 , and a coupling 110 is provided between the connecting shaft and the output shaft of the telescopic cylinder 203 .

[0041] The needle tube of the second syringe 90 is provided with a capacitor module, in which a sensor is provided. The sensor acts on the valve 902. The capacitor module is used to monitor whether there is residual liquid in the medicine.

[0042] like Figure 5 As shown, a method for intravenous preparation of narcotic anesthetic and recovery of residual liquid comprises the following steps:

[0043] S1, intravenous drug preparation equipment unit, the first clamp 50 is connected to the hospital computer through the network, and when receiving the liquid preparation instruction, it accurately prepares the volume B of the type A narcotic drug. The movable seat 202 drives the first syringe 80 set on the top to move to the type A drug position, and draws a specified amount of the narcotic drug from the medicine bottle 30. The specific telescopic cylinder 203 drives the first clamp 50 to descend, and the first syringe 80 set on the first clamp 50 descends. The needle of the first syringe 80 enters the medicine bottle 30, and the type A drug in the medicine bottle 30 is calibrated in advance by the electronic scale 70. The first syringe 80 is inserted into the type A drug, and the sliding block 503 drives the piston rod 802 to move, generating negative pressure in the syringe a801, and the piston rod 802 moves a certain distance to draw a specified amount of liquid. The liquid is accurately drawn through the algorithm for intravenous preparation;

[0044] S2, residual liquid and empty bottle recovery equipment unit: After the static preparation is completed, the residual liquid of type A medicine needs to be recovered. At this time, the second clamp 60 is moved to the medicine bottle 30 by relying on another set of movable seats 202. When the needle of the second syringe 90 is inserted into type A medicine, the valve 902 is activated and the suction unit, which can be a pump-like component, is used to suck the liquid. After the liquid is sucked, the capacitance change of the capacitor module with the syringe b901 of the second syringe 90 is used to determine that there is no liquid. A command is issued to close the valve 902. The volume of the sucked liquid is calculated based on the flow rate and time of the valve 902.

[0045] S3, Volatile Liquid Recovery Unit: During the entire static preparation and residual liquid recovery process, the toxic volatile liquid generated is cooled to liquid form in a fully sealed instrument through the volatile liquid recovery system 40. The liquid is then pumped back to the residual liquid recovery unit for weighing and comparison. The accuracy of the static preparation and residual liquid recovery is verified by checking the time of each process.

[0046] S4, the multiple verification unit, performs multiple verifications on the volatilization of type A narcotic drugs during the static preparation process and the residual liquid recovery process to ensure accuracy.

[0047] The intravenous drug preparation equipment unit includes a signal pre-processing unit and a multiple verification unit;

[0048] Signal preprocessing unit: provides syringe parameters through demand instructions, converts them into movement distance, controls the first fixture 50 to drive the first syringe 80 to move to the specified distance to achieve suction accuracy;

[0049] Specifically, d = n0 / X;

[0050] n0: Absorbed liquid capacity (ul);

[0051] d: syringe movement distance (mm);

[0052] X: other syringe bottom area (mm2);

[0053] For example, if the instruction requires: syringe parameters: 500ul, inner wall diameter: 10mm, draw 50ul of liquid, then the algorithm can calculate the distance d, where d = n0 / 100 = 50 / 100 = 0.5mm; then the sliding block 503 on the first fixture 50 drives the piston rod 802 to move 0.5mm;

[0054] Multiple Verification Unit A: uses an electronic scale 70 to measure the difference in weight before and after aspiration, converts it into the accuracy of the aspirated liquid, exchanges and verifies the data with the signal pre-processing unit, deducts the amount of volatile liquid recovered during the static dispensing period, and calculates the true and accurate value of the static dispensing;

[0055] Specifically, n1 = (a0 - a1) / m1 = (5 - 4.45) / 1 = 55ul;

[0056] n1: The converted liquid volume before and after weighing (ul);

[0057] a0: weight of the drug before preparation (g);

[0058] a1: weight of the drug after static preparation (g);

[0059] m1: density of type A drug (g / ml);

[0060] If the weight change measured by the electronic scale 70 at the bottom of the drug 30 is 5 grams before suction and 4.45 grams after suction, and the density of type A drug is 1, then n1 = (a0-a1) / m1 = (5-4.45) / 1 = 55ul,

[0061] During the static preparation period, the type A narcotic drug is also volatilizing. The amount of volatilized liquid recovered during the static preparation period is calculated by comparing the weight of the recovery bottle 401 before and after the static preparation period and the value of the static preparation period.

[0062] Specifically, n2 = (a2 - a3) / m1 * (t1 / t0);

[0063] n2 Amount of volatile liquid recovered during static mixing period (ul);

[0064] a3 Weight before evaporation of liquid (g);

[0065] a2 Weight after evaporation of liquid (g);

[0066] m1: density of type A drug (g / ml);

[0067] t1: static mixing time (seconds);

[0068] t0: total time (seconds);

[0069] According to the above assumptions, the weight of the volatile liquid before the static mixing period is 0; the weight after the static mixing period is 9g, the static mixing time is 15 seconds, and the total time is 30 seconds. The amount of volatile liquid recovered during the static mixing period n2 = (9-0) / 1*(15 / 30) = 9X0.5 = 4.5ul

[0070] Multiple checks on the accuracy of static aspiration;

[0071] q1=1-(n1-n0-n2) / (n0+n2);

[0072] q1: Accuracy of static mixing after multiple checks (percentage);

[0073] n0: Absorbed liquid capacity (ul);

[0074] n1: The converted liquid volume before and after weighing (ul);

[0075] n2 The amount of volatile liquid recovered during the static mixing period (ul).

[0076] According to the above data, we can conclude that q1=1-(n1-n0-n2) / (n0+n2)=1-(55-50-4.5) / (50+4.5)=99%

[0077] It can be concluded that the accuracy is 99%, which meets the requirements;

[0078] The residual liquid and empty bottle recovery equipment unit includes a liquid level signal control unit, a valve control calculation unit, a multiple verification unit B and empty bottle information;

[0079] Liquid level signal control unit: Based on the capacitance and air pressure changes before and after the needle of the second syringe 90 contacts the liquid surface, the sensor on the second syringe 90 collects the signal to determine whether it reaches a threshold value, thereby activating and closing the valve 902 to absorb the remaining liquid;

[0080] The recovery amount of the residual liquid is specifically:

[0081] n3 = t2 * s1;

[0082] n3: absorb the remaining liquid (ul);

[0083] t2: total valve time (seconds);

[0084] S1: valve flow rate (ul / second);

[0085] If the needle tube touches the liquid surface until there is no liquid, the total time t2 of the liquid level signal unit controlling the valve opening to closing is 10 seconds; the valve flow rate s1: 5ul / second, and the remaining liquid n3 = 10*5ul = 50ul;

[0086] In the residual liquid time period, the weight before volatile liquid is 0; the weight after volatile liquid is 9g, the residual liquid time is 15 seconds, and the total time is 30 seconds. According to the algorithm of the volatile liquid recovery amount in the static mixing time period, it can be obtained that n4=(9-0) / 1*(15 / 30)=9X0.5=4.5ul;

[0087] Where n4: the amount of volatile liquid recovered during the residual liquid absorption period;

[0088] Then absorb the liquid capacity by converting the residual liquid before and after weighing;

[0089] Specifically, n5 = (a6 - a7) / m1;

[0090] n5: The residual liquid absorption volume converted before and after weighing (ul);

[0091] a6: Weight of the residual liquid before absorption (g);

[0092] a7: Weight of the remaining liquid after absorption (g);

[0093] m1: density of type A drug (g / ml);

[0094] For example, if a6 before the residual liquid is absorbed is 5 grams and a7 after the residual liquid is absorbed is 4.45 grams, and the liquid density m1 is 1, the weight change before and after the residual liquid is absorbed is: n5 = (a6-a7) / m1 = (5-4.45) / 1 = 55ul;

[0095] Then confirm through multiple checks

[0096] Residual liquid aspiration accuracy q2 = 1-(n5-n3-n4) / (n3+n4) = 1-(55-50-4.5) / (50+4.5) = 99%; composite requirement;

[0097] Valve control calculation unit: calculates the time and flow rate during the operation and closing of the valve, and outputs the residual liquid absorption value.

[0098] Multiple verification unit B: Calculates the residual liquid time period with the volatile liquid recovery unit and outputs the volatile value of the residual liquid stage.

[0099] During the period of residual liquid absorption, the weight change before and after the volatile liquid is extracted is used to calculate the amount of volatile liquid recovered during the period of residual liquid absorption.

[0100] The accuracy is calculated by multiple comparison of the volatile liquid recovery amount during the residual liquid absorption period and the volatile liquid recovery amount during the static preparation period;

[0101] The volatile liquid recovery unit includes a gas valve control unit, a cooling unit and a weighing unit, wherein the gas valve control unit can be a recovery pump 403, the weighing unit can be an electronic scale 70, and the cooling unit is set in the recovery bottle 401. The recovery pump 403 is started, and the gas of the volatile liquid in the sealed chamber 10 is recovered by the recovery pump 403 through the recovery pipe 402 and the suction plate 404 set at the end of the recovery pipe 402. The gas is then converted into liquid at room temperature through the cooling unit set in the recovery bottle 401, and the weighing unit is used to calculate its liquid capacity.

[0102] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for statically preparing narcotic drugs and recovering residual liquid, characterized by: It includes a sealed chamber, a motion component, a recovery system, a first clamp and a second clamp; A first syringe and a second syringe are respectively provided on the front sides of the first clamp and the second clamp; The motion assembly includes a stator seat and a mover seat arranged on the top of the stator seat, a telescopic cylinder is fixedly installed on the outer wall of the top of the mover seat, and a connecting block is provided on the top of the output shaft of the telescopic cylinder; The first fixture includes a first base plate, two groups of fixed blocks are provided on the front side of the first base plate, a sliding block is provided between the two groups of fixed blocks, and a telescopic rod is fixedly connected to the outer wall of the top of the sliding block; A limiting rod is provided between the two groups of fixed blocks, and the sliding block passes through the limiting rod and slides along the first base plate; The first syringe includes a syringe a and a piston rod disposed in the syringe a, wherein the piston rod is coupled to a sliding block; the second fixture includes a second base plate, a clamping seat is disposed on the front side of the second base plate, and the second syringe is fixed to the inner side of the clamping seat through a clamping groove of the clamping seat; The second syringe includes a syringe b, a valve is provided inside the syringe b, and transmission tubes are provided at both ends of the valve. The transmission tube near one end of the syringe b is connected to the needle at the bottom of the second syringe; The needle tube of the second syringe is provided with a capacitor module, wherein a sensor is provided in the capacitor module, the sensor acts on the valve, and the capacitor module is used to monitor whether there is residual liquid in the medicine; A medicine bottle is provided at the bottom of the first syringe, and an electronic scale for weighing is provided at the bottom of the medicine bottle; The recovery system includes a recovery bottle, a recovery pump is provided on the top of the recovery bottle, a recovery pipe is provided on the top of the recovery pump, an end of the recovery pipe away from the recovery pump is connected to an air suction plate, and the air suction plate is embedded in the top inner side of the sealed bin.

2. The device for preparing narcotic drugs and recovering residual liquid according to claim 1, characterized in that: A clamping groove is provided on the outer wall of the bottom of the sliding block at a position corresponding to the top end of the piston rod, for fixing the piston rod.

3. The device for preparing narcotic drugs and recovering residual liquid according to claim 1, characterized in that: A connecting shaft corresponding to the output shaft of the telescopic cylinder is provided at the bottom of the connecting block, and a coupling is provided between the connecting shaft and the output shaft of the telescopic cylinder.

4. A method for using the device for intravenous narcotic and anesthetic preparation and residual liquid recovery according to any one of claims 1 to 3, characterized in that: The steps include: S1. Intravenous drug dispensing equipment unit: The first fixture is connected to the hospital computer and, upon receiving a dispensing instruction, accurately dispenses a volume B of type A narcotic drug. The actuator drives the first syringe mounted on the top to the type A drug position, aspirating a prescribed amount of the drug from the vial. A specific telescopic cylinder drives the first fixture downward, and the first syringe mounted on the first fixture descends. The needle of the first syringe enters the vial, and the weight of the type A drug in the vial has been calibrated in advance using an electronic scale. The first syringe is then inserted into the type A drug, and the algorithm accurately aspirates the liquid for intravenous dispensing. S2, residual liquid and empty bottle recovery equipment unit, after the static preparation is completed, the residual liquid of type A medicine needs to be recovered. At this time, another set of movable seats is used to move the second clamp to the medicine bottle. When the needle of the second syringe is inserted into type A medicine, the valve is activated to use the suction unit and the pump to suck the liquid. After the liquid is sucked out, the capacitance change of the capacitance module with the syringe b of the second syringe is used to determine that there is no liquid. A command is issued to close the valve. The volume of the sucked liquid is calculated based on the flow rate and time of the valve; S3, Volatile liquid recovery unit: During the entire static preparation and residual liquid recovery process, the toxic volatile liquid generated is cooled into liquid through the volatile liquid recovery system in a fully sealed instrument and then pumped back to the residual liquid recovery equipment unit for weighing and comparison. The accuracy of static preparation and residual liquid recovery is verified by the time of each process. S4, a multiple verification unit, performs multiple verifications on the volatilization of type A narcotic drugs during the static preparation process and the residual liquid recovery process to ensure accuracy; The intravenous drug preparation equipment unit includes a signal pre-processing unit and a multiple verification unit; Signal preprocessing unit: provides syringe parameters through demand instructions, converts them into movement distance, controls the first fixture to drive the first syringe to move to the specified distance to achieve suction accuracy; Specifically, d = n0 / X; n0: liquid capacity absorbed; d: syringe movement distance; X: the bottom area of other syringes; Multi-verification unit A: uses an electronic scale to measure the difference in weight before and after aspiration, converts it into the accuracy of the aspirated liquid, exchanges and verifies the data with the signal pre-processing unit, deducts the amount of volatile liquid recovered during the static mixing period, and calculates the true and accurate value of the static mixing; Specifically, n1 = (a0-a1) / m1 n1: The liquid volume absorbed before and after weighing; a0: weight of the drug before preparation; a1: weight of the drug after static preparation; m1: density of type A drug; During the static preparation period, the narcotic drug A is also volatilizing. The amount of volatilized liquid recovered during the static preparation period is calculated by comparing the weight of the recovery bottle before and after and the value of the static preparation period. Specifically, n2 = (a2 - a3) / m1 * (t1 / t0); n2 The amount of volatile liquid recovered during the static mixing period; a3 Weight before volatile liquid; a2 weight after evaporation of liquid; m1: density of type A drug; t1: static mixing time; t0: total time; Multiple checks on the accuracy of static aspiration; q1=1-(n1-n0-n2) / (n0+n2); Q1: Accuracy of static mixing after multiple checks; n0: liquid capacity absorbed; n1: The liquid volume absorbed before and after weighing; n2 The amount of volatile liquid recovered during the static mixing period; Based on the above data, q1 = 1-(n1-n0-n2) / (n0+n2); The residual liquid and empty bottle recovery equipment unit includes a liquid level signal control unit, a valve control calculation unit, a multiple verification unit B and empty bottle information; Liquid level signal control unit: Based on the capacitance and air pressure changes before and after the needle of the second syringe contacts the liquid surface, the sensor on the second syringe collects the signal to see if it reaches a threshold value, and then starts and closes the valve to absorb the remaining liquid; The recovery amount of the residual liquid is specifically: n3 = t2 * s1; n3: absorb the remaining liquid; t2: total valve time; S1: valve flow; Calculate the amount of volatile liquid recovered during the residual liquid absorption period n4; Then absorb the liquid capacity by converting the residual liquid before and after weighing; Specifically, n5 = (a6 - a7) / m1; n5: The residual liquid absorption capacity converted before and after weighing; a6: Weight of the remaining liquid before absorption; a7: Weight of the remaining liquid after absorption; m1: density of type A drug; The residual liquid aspiration accuracy q2=1-(n5-n3-n4) / (n3+n4) is then determined by multiple checks.

5. The method for using the device for intravenous narcotic and anesthetic preparation and residual liquid recovery according to claim 4, characterized in that: The volatile liquid recovery unit includes a gas valve control unit, a cooling unit and a weighing unit, wherein the gas valve control unit is a recovery pump, the weighing unit is an electronic scale, and the cooling unit is arranged in the recovery bottle. The recovery pump is started, and the gas of the volatile liquid in the sealed chamber is recovered through the recovery pump through the recovery pipe and the suction plate arranged at the end of the recovery pipe. The gas is then converted into liquid at room temperature through the cooling unit arranged in the recovery bottle, and the weighing unit is used to calculate its liquid capacity.

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