Auxiliary medicine taking device for anesthetic medicine quantitative proportioning and medicine taking method

Abstract

The present application relates to the technical field of medical equipment, in particular to an auxiliary medicine taking device for anesthetic medicine quantitative proportioning and a medicine taking method, comprising a mounting frame in detachable fixed connection with a syringe barrel and a scale bar parallel to the barrel, the scale bar and the mounting frame are in sliding connection along the axial direction of the barrel, a locking part for limiting the sliding of the scale bar is arranged between the scale bar and the mounting frame; a limiting strip and a counterweight strip are arranged at the end of the scale bar away from the syringe needle, the limiting strip and the scale bar are in sliding connection along the radial direction of the barrel, the counterweight strip and the scale bar are in sliding connection along the axial direction of the barrel, a transmission part is arranged between the limiting strip and the counterweight strip, the counterweight strip slides on the scale bar and drives the limiting strip to slide through the transmission part. The problem of large medicine taking error caused by the large difference of scale values read at different angles when reading the volume of liquid medicine by visually observing the lowest point of the liquid surface in the syringe is solved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to an auxiliary drug dispensing device and method for quantitative preparation of anesthetic drugs. Background Technology

[0002] The precise mixing of anesthetic drugs is a core aspect of clinical anesthesia, and its accuracy directly affects the anesthetic effect and patient safety. Therefore, it is necessary to accurately measure the volume of different anesthetic agents to improve the accuracy of the mixing process.

[0003] Currently, the dispensing of anesthetic drugs is mainly done manually. The operator holds the syringe, inserts the needle into the vial or ampoule, hooks the finger rest (the flange on the outer wall of the syringe opening) with their index and middle fingers, and holds the plunger on the piston rod with their thumb, pulling the plunger to aspirate an excess volume, making the actual aspirated volume greater than the required volume. Then, with the syringe needle pointing upwards, the plunger is pressed to expel air and excess medication from the syringe until the lowest liquid level mark in the syringe corresponds to the required volume, at which point the dispensing process is complete.

[0004] However, during manual medication dispensing, the operator needs to visually observe the scale line corresponding to the lowest point of the liquid level in the syringe to read the volume of the liquid. Since it is difficult to keep the observation angle consistent, the scale values ​​read at different angles vary greatly, resulting in a large error in medication dispensing. At the same time, it is difficult for the thumb to accurately control the displacement of the piston rod, which further reduces the accuracy of medication dispensing. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an auxiliary drug dispensing device and method for quantitative preparation of anesthetic drugs, so as to solve the problem that the existing technology reads the drug volume by visually observing the scale line corresponding to the lowest point of the liquid level in the syringe, and the scale value read at different angles varies greatly, resulting in a large error in drug dispensing.

[0006] This invention is achieved through the following technical solution: An auxiliary dispensing device for quantitative mixing of anesthetic drugs includes a mounting frame detachably and fixedly connected to a syringe barrel and a scale bar parallel to the syringe barrel. The scale bar and the mounting frame are slidably connected along the axial direction of the syringe barrel, and a locking part is provided between the scale bar and the mounting frame to limit the sliding of the scale bar. The end of the scale bar facing away from the syringe needle is provided with a limit bar and a counterweight bar. The limit bar and the scale bar are slidably connected along the radial direction of the syringe barrel, and the counterweight bar and the scale bar are slidably connected along the axial direction of the syringe barrel. A transmission part is provided between the limit bar and the counterweight bar. The counterweight bar slides on the scale bar and drives the limit bar to slide through the transmission part, which can present the following two states: In state one, when the counterweight slides away from the syringe needle under the action of gravity, one end of the limiting bar slides out of the side wall of the scale bar and is located on the movement trajectory of the piston rod push handle; In state two, when the counterweight slides towards the syringe needle under the action of gravity, the end of the limiting bar slides and retracts into the side wall of the scale bar.

[0007] Furthermore, the side wall of the end of the scale bar facing away from the syringe needle has a mounting cavity, and the transmission part includes a gear that rotates with the inner wall of the mounting cavity; Both the limiting strip and the counterweight strip are rack-shaped and mesh with gears respectively; The limiting strip is embedded in the mounting cavity and slides against the inner wall of the mounting cavity facing away from the needle tip, and the counterweight strip is embedded in the mounting cavity and slides against the inner wall of the mounting cavity facing away from the axis of the syringe barrel.

[0008] Furthermore, the scale bar has graduation lines engraved on its sidewalls, which are evenly arranged along the length of the scale bar.

[0009] Furthermore, the scale lines are provided in two sets. One set of scale lines is used to indicate the volume of the cavity inside the syringe when the piston rod push handle abuts against the surface of the limiting strip facing the needle tip. The other set of scale lines is used to indicate the volume of the cavity inside the syringe when the piston rod push handle abuts against the surface of the limiting strip facing away from the needle tip.

[0010] Furthermore, the mounting bracket has a through hole on one surface facing the needle tip that is adapted to the scale strip, and one end of the scale strip is inserted into the through hole and slidably fitted. The through hole has a threaded hole on its sidewall that connects the inner and outer sides. The locking part includes a bolt. The threaded end of the bolt is screwed into the threaded hole and abuts against the scale strip. The bolt and the threaded hole are connected by a threaded engagement.

[0011] Furthermore, the mounting bracket has a groove on one side wall facing the syringe axis that is adapted to the finger support at the syringe opening.

[0012] A method for obtaining medication, comprising using the aforementioned auxiliary medication dispensing device for quantitative mixing of anesthetic drugs, including the following steps: S1. Fix the mounting bracket to the open end of the syringe barrel; S2. Insert the needle of the syringe into the container containing the anesthetic. The operator hooks the finger support at the opening of the syringe with the index and middle fingers, and presses the piston rod handle with the thumb to pull the piston rod to draw up the liquid. S3. Adjust the position of the scale bar relative to the end of the mounting bracket and lock it with the locking part so that when the piston rod push handle abuts against the limit bar, the volume of the cavity from the piston to the needle inside the syringe is the required volume. S4. With the syringe needle pointing upwards and the needle positioned above the waste liquid container, the limiting strip will automatically present state one under gravity. The operator hooks the syringe finger support with their index and middle fingers, presses the piston rod handle with their thumb, and pushes the piston rod until the handle abuts against the limiting strip, expelling air bubbles and excess liquid from the syringe, so that the syringe contains the required volume of liquid.

[0013] Furthermore, when the anesthetic solution is stored in an ampoule, the specific steps in S2 are as follows: S21a. Insert the syringe needle downwards below the liquid level in the ampoule, so that the limiting strip automatically presents state two under the action of gravity; S22a. The operator hooks the finger support at the opening end of the syringe with the index and middle fingers, and presses the piston rod handle with the thumb to pull the piston rod to draw up the liquid, so that the required volume of the liquid is less than the actual volume drawn up.

[0014] Furthermore, when the anesthetic solution is stored in a vial, a step S11 for adjusting the initial position of the scale bar is added before step S2, specifically as follows: S11. Adjust the position of the scale bar relative to the mounting bracket and lock it with the locking part so that when the outer end face of the piston rod push handle abuts against the limiting bar, the volume of the cavity from the piston to the needle inside the syringe is the target volume, and the required volume is less than the target volume. The specific steps of S2 are as follows: S21b, Pull the piston rod until the push handle abuts against the limit bar at the initial position, adjust the initial position of the piston rod push handle to store the target volume of air in the syringe; S22b. Pierce the rubber stopper of the vial with the syringe needle, press the piston rod handle, and inject the target volume of air into the vial to create positive pressure inside the vial. S23b. Invert the vial so that the syringe needle is facing upward and the liquid is submerged in the needle tip. The limiting bar will automatically switch from state two to state one under the action of gravity. S24b: The operator hooks the syringe finger support with the index and middle fingers, presses the piston rod handle against the thumb, and pulls the piston rod until the handle abuts against the limit strip at the end position to draw up the liquid, so that the volume of liquid obtained by drawing up is the target volume.

[0015] Furthermore, the required volume is equal to 80% of the target volume.

[0016] The beneficial effects of this invention are as follows: This invention discloses an auxiliary dispensing device and method for quantitatively dispensing anesthetic drugs. It utilizes a scale parallel to the syringe barrel, with a limiting strip protruding from the side wall of the scale at its end. This limiting strip serves as a restraining structure on the piston rod's trajectory, ensuring that the volume of the drug solution inside the syringe is the required volume when the piston rod is in contact with the limiting strip. The required volume can be adjusted simply by sliding and adjusting the position of the scale relative to the mounting bracket. Compared to readings based on the irregular structure of the drug solution's surface and the syringe's graduations, this device reduces dispensing errors caused by reading deviations by pre-adjusting the relative position of the scale and the mounting bracket and measuring the displacement value of the regular structure.

[0017] Simultaneously, the sliding of the counterweight bar under gravity drives the limit bar to automatically switch states via the transmission unit. The action of pushing the syringe upward to inject liquid or expel air is matched with the extension action of the limit bar, so that the limit bar automatically extends and limits during liquid or air discharge, eliminating the need for separate operation of the limit bar sliding. When the push handle abuts against the outer end face of the limit bar, the piston rod can hardly continue to slide to push out the liquid. Compared with the method of controlling the displacement of the piston rod by pressing with the thumb, this device only requires pressing the push handle until it abuts against the outer end face of the limit bar, making it much easier to operate.

[0018] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention; Figure 2 This is a schematic diagram of the planar structure of an embodiment of the present invention; Figure 3 for Figure 2 Cross-sectional view of AA (State 2); Figure 4 for Figure 3 A magnified view of a section at point B in the middle; Figure 5 for Figure 2 Cross-sectional view of AA (State 1); Figure 6 for Figure 5 A magnified view of a section at point C; Figure 7 This is a three-dimensional structural diagram of the mounting bracket in an embodiment of the present invention; Figure 8 This is a three-dimensional structural diagram of the limiting strip, counterweight strip, and gear in an embodiment of the present invention.

[0020] In the diagram: 1. Syringe; 11. Finger rest; 2. Needle; 3. Push handle; 4. Mounting bracket; 41. Through hole; 42. Threaded hole; 43. Groove; 5. Scale strip; 51. Mounting cavity; 6. Limiting strip; 7. Counterweight strip; 8. Gear; 9. Bolt. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the above description of the present invention, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0026] Please see Figure 1-8The present invention provides a technical solution: an auxiliary drug dispensing device for quantitative proportioning of anesthetic drugs, including a mounting frame 4 detachably fixedly connected to a syringe barrel 1 and a scale bar 5 parallel to the syringe barrel 1. The scale bar 5 and the mounting frame 4 are slidably connected along the axial direction of the syringe barrel 1, and a locking part for limiting the sliding of the scale bar 5 is provided between the scale bar 5 and the mounting frame 4. The end of the scale bar 5 facing away from the syringe needle 2 is provided with a limiting strip 6 and a counterweight strip 7. The limiting strip 6 is slidably connected to the scale bar 5 along the radial direction of the syringe barrel 1, and the counterweight strip 7 is slidably connected to the scale bar 5 along the axial direction of the syringe barrel 1. A transmission part is provided between the limiting strip 6 and the counterweight strip 7. The counterweight strip 7 slides on the scale bar 5 and drives the limiting strip 6 to slide through the transmission part, which can present the following two states: State 1 (e.g.) Figure 3 , 4 As shown), when the counterweight bar 7 slides away from the syringe needle 2 under the action of gravity, one end of the limiting bar 6 slides out of the side wall of the scale bar 5 and is located on the movement trajectory of the piston rod push handle 3. State 2 (e.g.) Figure 5 , 6 As shown, when the counterweight 7 slides towards the syringe needle 2 under the action of gravity, the end of the limiting strip 6 slides and retracts into the side wall of the scale strip 5.

[0027] In this design, a scale bar 5 parallel to the syringe barrel 1 is installed, and a limiting strip 6 protruding from the side wall of the scale bar 5 is provided at the end of the scale bar 5. The limiting strip 6 serves as a limiting structure on the movement trajectory of the piston rod push handle 3. The volume of the liquid inside the syringe barrel 1 when the push handle 3 is in contact with the limiting strip 6 is taken as the required volume. The required volume can be adjusted simply by sliding and adjusting the position of the scale bar 5 relative to the mounting bracket 4. Compared with the reading method based on the irregular structure of the liquid level and the scale lines on the surface of the syringe barrel 1, this device can reduce the drug dispensing error caused by reading deviation by adjusting the relative position of the scale bar 5 and the mounting bracket 4 in advance and measuring the displacement value of the regular structure.

[0028] Simultaneously, the sliding of the counterweight 7 under gravity drives the limiting strip 6 to automatically switch states via the transmission unit. The action of pushing the syringe upward to inject liquid or expel air is matched with the extension action of the limiting strip 6, so that the limiting strip 6 automatically extends and limits during liquid or air discharge, without the need for separate operation of the limiting strip 6 sliding. When the push handle 3 abuts against the outer end face of the limiting strip 6, the piston rod can hardly continue to slide to push out the liquid. Compared with the method of controlling the displacement of the piston rod by pressing with the thumb, this device only requires pressing the push handle 3 until it abuts against the outer end face of the limiting strip 6, making it easier to operate.

[0029] The scale bar 5 is located on one side of the piston rod and has a regular rectangular shape. This prevents the scale bar 5 from contacting the push handle 3 at the end of the piston rod. The limit bar 6, which protrudes from the side wall of the scale bar 5, serves as the limiting structure for the push handle 3. That is, in state two, the piston rod and the push handle 3 can slide freely radially along the syringe 1 and pass through the position of the limit bar 6.

[0030] The mounting bracket 4 has a shaped notch on one side wall facing the piston rod that is adapted to the piston rod. By inserting the piston rod into the shaped notch, the piston rod is restricted from swinging radially relative to the syringe 1, so that the piston rod and the push handle 3 can slide smoothly along the axial direction of the syringe 1.

[0031] In this embodiment: the side wall of the scale bar 5 facing away from the syringe needle 2 has an installation cavity 51, and the transmission part includes a gear 8 that rotates with the inner wall of the installation cavity 51; The limiting strip 6 and the counterweight strip 7 are both rack-shaped and mesh with the gear 8 respectively; The limiting strip 6 is embedded in the mounting cavity 51 and slides in cooperation with an inner wall of the mounting cavity 51 facing away from the needle 2. The counterweight strip 7 is embedded in the mounting cavity 51 and slides in cooperation with an inner wall of the mounting cavity 51 facing away from the axis of the syringe 1.

[0032] In this design, a compact and smoothly operating linkage mechanism is formed by the limiting bar 6, the counterweight bar 7, and the gear 8 (the limiting bar 6 and the counterweight bar 7 are perpendicular to each other). When the counterweight bar 7 slides axially due to gravity, the gear 8 precisely converts the axial movement into the radial sliding of the limiting bar 6, ensuring that the limiting bar 6 can extend or retract quickly and accurately.

[0033] The limiting strip 6 and the counterweight strip 7 are both provided with a sliding groove extending in the length direction on the surface opposite to the gear 8. The inner wall of the mounting cavity 51 is provided with two protruding strips (such as T-shaped strips) that correspond one-to-one with the two sliding grooves. By using the two protruding strips to be embedded in the two sliding grooves and slidingly engaged, the limiting strip 6 and the counterweight strip 7 are slidably installed in the mounting cavity 51 and can only slide along their own length direction.

[0034] The mounting cavity 51 is open on the side facing the axis of the syringe 1 so that the limiting strip 6 can slide out; the side of the mounting cavity 51 facing away from the axis of the syringe 1 is closed. In state two, the limiting strip 6 abuts against the side wall of the mounting cavity 51 facing away from the axis of the syringe 1, and the limiting strip 6 is completely retracted into the mounting cavity 51.

[0035] The counterweight 7 and the limiting strip 6 are preferably made of engineering plastics (such as polyoxymethylene or nylon) or lightweight metal materials (such as aluminum alloy) with good self-lubricating properties. Their surfaces are smooth and their density is moderate, which ensures that the counterweight 7 can slide reliably under the action of gravity and significantly reduces the frictional resistance during the sliding process. However, the weight of the counterweight 7 is twice that of the limiting strip 6 (when both are made of the same material, this weight ratio can be achieved by increasing the volume ratio), so that the counterweight 7 can smoothly drive the limiting strip 6 to slide under its own weight.

[0036] In this embodiment: the scale bar 5 has scale lines engraved on its side wall, which are evenly arranged along the length of the scale bar 5.

[0037] In this design, evenly spaced graduation lines are engraved on the side wall of the scale bar 5, providing the operator with an intuitive volume reference. When adjusting the relative position of the scale bar 5 and the mounting bracket 4, the operator can accurately set the relative position of the limit bar 6 and the piston rod push handle 3 based on the graduation lines, making the preset volume adjustment process quantifiable and visual. Compared to reading the liquid level inside the syringe 1 and the graduation lines on the outer wall of the syringe 1, the graduation lines on the scale bar 5 can be observed and identified more intuitively, thereby reducing reading errors.

[0038] In this embodiment, two sets of scale lines are provided. One set of scale lines is used to indicate the volume of the cavity inside the syringe 1 when the piston rod push handle 3 abuts against the surface of the limiting strip 6 facing the needle 2. The other set of scale lines is used to indicate the volume of the cavity inside the syringe 1 when the piston rod push handle 3 abuts against the surface of the limiting strip 6 facing away from the needle 2.

[0039] In this design, two sets of scale lines are set to correspond to the volume of the syringe 1 cavity when the piston rod push handle 3 and the limiting strip 6 are in contact with each other. One set of scales is suitable for scenarios involving routine dispensing to a precise volume; the other set of scales provides a precise positioning basis for presetting the initial aspiration volume before aspiration (such as pre-injecting air when operating vials). This bidirectional scale design allows the device to flexibly adapt to different medication dispensing scenarios, further improving the convenience and practicality of operation.

[0040] Both sets of scale lines are located on the side of the scale strip 5 facing away from the axis of the syringe 1, and are arranged along the width direction of the scale strip 5. The two sets of scale lines are set on the same plane to facilitate comparison and differentiation.

[0041] In this embodiment: the mounting bracket 4 has a through hole 41 on one surface facing the needle 2, which is adapted to the scale strip 5. One end of the scale strip 5 is inserted into the through hole 41 and is slidably fitted. The through hole 41 has a threaded hole 42 on its side wall that connects the inner and outer sides. The locking part includes a bolt 9. The threaded end of the bolt 9 is screwed into the threaded hole 42 and abuts against the scale strip 5. The bolt 9 and the threaded hole 42 are connected by a threaded engagement.

[0042] In this design, a through hole 41 is provided on the mounting bracket 4 for the sliding engagement of the scale strip 5, and a bolt 9 is screwed into the threaded hole 42 to press against the scale strip 5 as a locking part, thus achieving stepless adjustment and stable locking of the scale strip 5. The operator can flexibly slide the scale strip 5 to any corresponding position according to the required volume of different anesthetic drugs, and easily lock it by rotating the bolt 9. The operation is simple and the locking is reliable.

[0043] A friction pad with a high coefficient of friction (such as a silicone pad) can be fixed (e.g., bonded) to the end face of the threaded end of the bolt 9. The friction pad abuts against the scale strip 5, and the friction pad is tightly attached to the surface of the scale strip 5 by tightening the bolt 9. This provides greater friction and restricts the sliding of the scale strip 5.

[0044] The scale bar 5 is rectangular in shape, and the through hole 41 is adapted to it, so that the scale bar 5 can only slide in the length direction.

[0045] In this embodiment: the mounting bracket 4 has a groove 43 on one side wall facing the axis of the syringe 1 that is adapted to the finger support 11 at the opening end of the syringe 1.

[0046] In this design, the groove 43 is used for the insertion of the finger support 11 at the opening end of the syringe 1, and a tight fit (interference fit) connection is established, achieving a quick and detachable fixed connection between the mounting bracket 4 and the syringe syringe 1. Through the engagement of the groove 43 and the finger support 11, the device can be firmly attached to the syringe, allowing for installation and removal without the need for additional tools. Furthermore, it can be installed and used with different syringes (e.g., when using multiple syringes to collect various anesthetic agents, the device can be switched between multiple syringes), improving the device's versatility and practicality. A method for obtaining medication, comprising using the aforementioned auxiliary medication dispensing device for quantitative mixing of anesthetic drugs, including the following steps: S1. Fix the mounting bracket 4 to the open end of the syringe barrel 1; S2. Insert the needle 2 of the syringe into the container containing the anesthetic. The operator hooks the finger support 11 at the opening of the syringe 1 with the index and middle fingers, and presses the piston rod handle 3 with the thumb to pull the piston rod to draw up the liquid. S3. Adjust the position of the scale bar 5 relative to the end of the mounting bracket 4 and lock it with the locking part so that when the piston rod push handle 3 abuts against the limiting bar 6, the volume of the cavity from the piston to the needle 2 inside the syringe 1 is the required volume. S4. With the syringe needle 2 facing upward and the needle 2 positioned above the waste liquid container, the limiting strip 6 will automatically present state one under the action of gravity. The operator hooks the finger support 11 of the syringe 1 with the index and middle fingers, and presses the piston rod push handle 3 with the thumb. The piston rod is pushed until the push handle 3 abuts against the limiting strip 6, expelling air bubbles and excess medicine from the syringe 1, so that the syringe 1 contains the required volume of medicine.

[0047] This method, through the steps of "first fixing, then excessive aspiration, and finally physical limiting of drainage / venting," transforms the drainage process, which originally relied on the operator's subjective judgment and precise control, into a deterministic operation dominated by mechanical structures. The operator only needs to press the piston rod until the push handle 3 abuts against the limiting strip 6 to accurately obtain the required volume of medication, eliminating the need for repeated observation of the scale during drainage. This reduces the operational difficulty and the requirement for operator experience, effectively minimizing errors caused by visual angles and unstable manual control, and improving the accuracy and efficiency of anesthetic drug quantitative preparation.

[0048] After the S4 drainage / venting is completed, the device can be disassembled and removed to read the value of the liquid level inside syringe 1 corresponding to the outer wall of syringe 1, which helps to verify the volume of the collected drug solution. Alternatively, the device can be fixedly installed on the side of syringe 1 facing away from the scale line to avoid obstructing the scale line on the outer wall of syringe 1, allowing for auxiliary verification without disassembling the device.

[0049] The numbers in steps S1-S4 are only used to distinguish different steps and are not mandatory to complete all the steps in ascending order. The order of the steps can be flexibly adjusted. For example, S3 (adjusting the position of the end of scale bar 5) can be performed before S2 (drawing the medicine).

[0050] In this embodiment: when the anesthetic solution is stored in the ampoule, the specific steps of S2 are as follows: S21a. Insert the syringe needle 2 downwards below the liquid level in the ampoule, so that the limiting strip 6 automatically presents state two under the action of gravity. S22a. The operator hooks the finger support 11 at the opening end of the syringe 1 with the index and middle fingers, and presses the piston rod push handle 3 with the thumb to pull the piston rod to draw up the liquid, so that the required volume of the liquid is less than the actual volume drawn up.

[0051] In this design, when dispensing medication from ampoules, the device automatically enters state two (limit bar 6 retracts) when the needle 2 is inserted downwards into the medication, allowing the piston rod to retract freely and without obstruction during the over-absorption phase. This ensures that the device's state switching is entirely automated and relies on gravity, requiring no manual intervention from the operator during the aspiration process.

[0052] When S3 is performed before S2, the end position of the limit bar 6 can be used to assist in adjusting the suction operation of the piston rod. By simply controlling the push handle 3 to slide past the end position of the limit bar 6, the actual suction volume can be made greater than the required volume, allowing the operator to focus on smoothly pulling the piston rod for suction and ensuring the smoothness of the over-suction process.

[0053] In this embodiment: when the anesthetic solution is stored in a vial, an initial position adjustment step S11 for the scale bar 5 is added before step S2, specifically as follows: S11. Adjust the position of the scale bar 5 relative to the mounting bracket 4 and lock it with the locking part so that when the outer end face of the piston rod push handle 3 abuts against the limiting bar 6, the volume of the cavity from the piston to the needle 2 inside the syringe 1 is the target volume, and the required volume is less than the target volume. The specific steps of S2 are as follows: S21b, Pull the piston rod until the push handle 3 abuts against the limit bar 6 at the initial position, adjust the initial position of the piston rod push handle 3 so that the syringe 1 contains the target volume of air; S22b: Pierce the rubber stopper of the vial with the syringe needle 2, press the piston rod handle 3, and inject the target volume of air into the vial to create positive pressure inside the vial; S23b. Invert the vial so that the syringe needle 2 faces upward and the liquid immerses the needle tip. Under the action of gravity, the limiting bar 6 automatically switches from state two to state one. S24b: The operator hooks the finger support 11 of the syringe 1 with the index and middle fingers, and presses the piston rod push handle 3 with the thumb. The piston rod is pulled until the push handle 3 abuts against the limit strip 6 at the end position to draw up the liquid, so that the volume of liquid obtained by drawing up is the target volume.

[0054] In this solution, considering the unique characteristics of dispensing medication from vials, a new step is added to the original method: setting the initial position of the scale bar 5 using a device. First, a large target volume is injected using the limiting bar 6 to create positive pressure inside the vial. Then, in an inverted state, the limiting bar 6 automatically switches to state one, achieving precise aspiration of the medication. Furthermore, the limiting bar 6 restricts the maximum displacement of the piston rod during aspiration, thus limiting the maximum aspiration volume. This reduces the difficulty of aspiration and minimizes medication waste.

[0055] By combining the device's dual-position limiting function with the vial operation process, the mechanical limiting ensures the accuracy of the injected air volume, reducing the safety risks caused by excessive air injection. This solves the technical problem of difficulty in aspiration or inaccurate volume due to negative pressure inside the vial during medication dispensing.

[0056] In this embodiment: the required volume is equal to 80% of the target volume.

[0057] In this solution, the required volume for dispensing medication from vials is set to 80% of the target volume. By reserving a 20% margin, it is ensured that there is always sufficient air volume in syringe 1 when injecting air into the vial, avoiding insufficient air injection due to setting the target volume too low, which would prevent the effective establishment of positive pressure.

[0058] Simultaneously, it reduces the volume of medication wasted during dispensing. When injecting air into the vial to establish positive pressure, only the target volume of air needs to be pre-extracted from syringe 1, without needing to excessively aspirate a large amount of air and then expel the excess. This ensures a reasonable match between the air volume in syringe 1 and the final volume of medication obtained throughout the entire dispensing process. Compared to conventional operations where excessive aspiration leads to the expulsion of a large amount of excess medication, this ratio setting allows the operator to expel only a small amount of residual air and a trace amount of excess medication during the dispensing phase, reducing the waste of precious anesthetic medication.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An auxiliary dispensing device for quantitative preparation of anesthetic drugs, characterized in that: It includes a mounting bracket (4) that is detachably fixed to the syringe barrel (1) and a scale strip (5) that is parallel to the syringe barrel (1). The scale strip (5) and the mounting bracket (4) are slidably connected along the axial direction of the syringe barrel (1). A locking part for limiting the sliding of the scale strip (5) is provided between the scale strip (5) and the mounting bracket (4). The scale bar (5) has a limit bar (6) and a counterweight bar (7) at the end facing away from the syringe needle (2). The limit bar (6) and the scale bar (5) are slidably connected along the radial direction of the syringe (1). The counterweight bar (7) and the scale bar (5) are slidably connected along the axial direction of the syringe (1). A transmission part is provided between the limit bar (6) and the counterweight bar (7). The counterweight bar (7) slides on the scale bar (5) and drives the limit bar (6) to slide through the transmission part, which can present the following two states: In state one, when the counterweight bar (7) slides away from the syringe needle (2) under the action of gravity, one end of the limiting bar (6) slides out of the side wall of the scale bar (5) and is located on the movement trajectory of the piston rod push handle (3); In state two, when the counterweight bar (7) slides towards the syringe needle (2) under the action of gravity, the end of the limiting bar (6) slides into the side wall of the scale bar (5).

2. The auxiliary drug dispensing device for quantitative proportioning of anesthetic drugs according to claim 1, characterized in that: The ruler strip (5) has a mounting cavity (51) on the side wall of one end facing away from the syringe needle (2), and the transmission part includes a gear (8) that rotates with the inner wall of the mounting cavity (51). The limiting bar (6) and the counterweight bar (7) are both rack-shaped and mesh with the gear (8) respectively; The limiting strip (6) is embedded in the mounting cavity (51) and slides against the inner wall of the mounting cavity (51) opposite to the needle (2). The counterweight strip (7) is embedded in the mounting cavity (51) and slides against the inner wall of the mounting cavity (51) opposite to the axis of the syringe (1).

3. The auxiliary drug dispensing device for quantitative proportioning of anesthetic drugs according to claim 1, characterized in that: The scale bar (5) has scale lines engraved on its side wall, which are evenly arranged along the length of the scale bar (5).

4. The auxiliary drug dispensing device for quantitative proportioning of anesthetic drugs according to claim 3, characterized in that: The scale lines are provided in two sets. One set of scale lines is used to indicate the volume of the cavity inside the syringe (1) when the piston rod push handle (3) and the limiting strip (6) face the needle (2) and abut against each other. The other set of scale lines is used to indicate the volume of the cavity inside the syringe (1) when the piston rod push handle (3) and the limiting strip (6) face away from the needle (2) and abut against each other.

5. The auxiliary drug dispensing device for quantitative proportioning of anesthetic drugs according to claim 1, characterized in that: The mounting bracket (4) has a through hole (41) on one surface facing the needle (2) that is compatible with the scale strip (5). One end of the scale strip (5) is inserted into the through hole (41) and slides in fit. The through hole (41) has a threaded hole (42) on its side wall that connects the inner and outer sides. The locking part includes a bolt (9). The threaded end of the bolt (9) is screwed into the threaded hole (42) and abuts against the scale strip (5). The bolt (9) and the threaded hole (42) are connected by a threaded engagement.

6. The auxiliary drug dispensing device for quantitative proportioning of anesthetic drugs according to claim 1, characterized in that: The mounting bracket (4) has a groove (43) on one side wall facing the axis of the syringe (1) that is compatible with the finger support (11) at the opening end of the syringe (1).

7. A method for obtaining medication, comprising using the auxiliary medication dispensing device for quantitative proportioning of anesthetic drugs as described in any one of claims 1-6, characterized in that: Includes the following steps: S1. Fix the mounting bracket (4) to the open end of the syringe barrel (1); S2. Insert the needle (2) of the syringe into the container containing the anesthetic agent. The operator hooks the finger support (11) at the opening end of the syringe (1) with the index and middle fingers, and presses the piston rod handle (3) with the thumb to pull the piston rod to draw the drug solution. S3. Adjust the position of the end of the scale bar (5) relative to the mounting bracket (4) and lock it with the locking part so that when the piston rod push handle (3) abuts against the limit bar (6), the volume of the cavity from the piston to the needle (2) inside the syringe (1) is the required volume. S4. With the syringe needle (2) facing upward and the needle (2) positioned above the waste liquid container, the limiting strip (6) automatically presents state one under the action of gravity. The operator hooks the finger support (11) of the syringe (1) with the index and middle fingers, presses the piston rod push handle (3) with the thumb, and pushes the piston rod until the push handle (3) abuts against the limiting strip (6) to expel air bubbles and excess medicine from the syringe (1) so that the syringe (1) contains the required volume of medicine.

8. The method for obtaining medicine according to claim 7, characterized in that: When the anesthetic solution is stored in an ampoule, the specific steps in S2 are as follows: S21a. Insert the syringe needle (2) downwards into the ampoule below the liquid level, so that the limiting strip (6) automatically presents state two under the action of gravity. S22a. The operator hooks the finger support (11) at the opening end of the syringe (1) with the index and middle fingers, and presses the piston rod push handle (3) with the thumb to pull the piston rod to draw up the liquid, so that the required volume of the liquid is less than the actual volume drawn up.

9. The method for obtaining medicine according to claim 7, characterized in that: When the anesthetic solution is stored in a vial, a new scale bar (5) is added before step S2. The initial position adjustment step S11 is as follows: S11. Adjust the position of the scale bar (5) relative to the mounting bracket (4) and lock it with the locking part so that when the outer end face of the piston rod push handle (3) abuts against the limit bar (6), the volume of the cavity from the piston to the needle (2) inside the syringe (1) is the target volume, and the required volume is less than the target volume. The specific steps of S2 are as follows: S21b, pull the piston rod until the push handle (3) abuts against the limit bar (6) at the initial position, adjust the initial position of the piston rod push handle (3) so that the syringe (1) contains the target volume of air; S22b, pierce the rubber stopper of the vial with the syringe needle (2), press the piston rod push handle (3) to inject the target volume of air into the vial, so that positive pressure is formed inside the vial; S23b. Invert the vial so that the syringe needle (2) faces upward and the liquid immerses the needle tip. The limiting bar (6) automatically switches from state two to state one under the action of gravity. S24b. The operator hooks the finger support (11) of the syringe (1) with the index and middle fingers, presses the piston rod push handle (3) against the thumb, and pulls the piston rod until the push handle (3) abuts against the limit strip (6) at the end position to draw up the liquid, so that the volume of the liquid obtained by drawing up is the target volume.

10. The method for obtaining medicine according to claim 9, characterized in that: The required volume is equal to 80% of the target volume.

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