Medicine mixing device for intravenous medicine preparation center

By designing a new type of oscillation and anti-detachment device in the drug mixing device for the intravenous drug configuration center, the problem that the bottle may be shaken out during the oscillation process is solved, and the effect of improving the safety, accuracy and efficiency of drug configuration is achieved.

CN119926250APending Publication Date: 2025-05-06THE FIFTH MEDICAL CENT OF CHINESE PLA GENERAL HOSPITAL
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Patent Information

Application Number
CN202510251893.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-04
Publication Date
2025-05-06

AI Technical Summary

Technical Problem

The existing drug mixing device used intravenous drug configuration centers may cause the bottle to be vibrated and disengaged from the plug of the mixed medicine bottle during high-frequency oscillation, resulting in drug liquid leakage, drug waste, increased configuration costs and potential safety hazards.

Method used

A drug mixing device for intravenous drug configuration center is designed, and a new type of oscillation and anti-detachment device is adopted. The device includes an anti-detachment baffle, a lift sleeve, a fixed height sleeve and a soft protective pad. Through the cooperation of these components, the bottle can be effectively prevented from being disconnected from the mixed bottle cartridge due to oscillation.

Benefits of technology

Effectively prevent the bottle from being shaken out during the oscillation, reduce drug waste and safety hazards, improve the safety, accuracy and efficiency of drug configuration, and adapt to bottles of different sizes without frequent replacement of devices or complicated adjustments.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a medicine mixing device for an intravenous medicine configuration center, the medicine mixing device comprises a medicine mixing main machine and an oscillation bottom plate arranged on the upper side of the outer wall of the top end of the medicine mixing main machine, a shaft hole is formed in the center of the medicine mixing main machine, and an oscillation transmission shaft is inserted into the shaft hole; a novel oscillation anti-falling device is additionally arranged at the rear end of a medicine mixing main machine, so that when a plurality of medicine bottles filled with liquid medicine are inserted into a mixing medicine bottle insertion barrel to be oscillated and mixed, the high-frequency oscillation effect has a certain probability that the medicine bottles are vibrated to fall off from the mixing medicine bottle insertion barrel; the vibration anti-falling device can effectively prevent the situation from occurring, the device protects the top ends or the upper portions of the multiple medicine bottles inserted into the mixing medicine bottle insertion barrel through anti-falling baffles, and when the medicine bottles are vibrated to fall off due to the high-frequency vibration effect, the anti-falling baffles located at the top ends or the upper portions can prevent the medicine bottles from being separated from the mixing medicine bottle insertion barrel at the moment; therefore, the medicine bottle is prevented from falling off and being damaged and leaked.
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Description

Technical Field

[0001] The present invention belongs to the technical field related to medical devices, and in particular relates to a drug mixing device for an intravenous drug preparation center. Background Art

[0002] In the intravenous drug preparation center, it is crucial to mix drugs accurately, efficiently and safely. As a core equipment, the performance of the drug mixing device directly affects the quality and efficiency of drug preparation. The existing drug mixing devices used in intravenous drug preparation centers usually achieve uniform mixing of drugs by oscillation. When multiple medicine bottles containing liquid medicine are inserted into the mixing bottle insert, after the device is started, high-frequency oscillation is used to fully blend the liquid medicine in the bottles;

[0003] However, the current drug mixing device has obvious defects in the actual operation process. During the high-frequency oscillation process, due to the strong oscillation effect, there is a certain probability that the medicine bottle will be vibrated out of the mixing medicine bottle insert. This problem has brought many negative effects. On the one hand, the medicine bottle may break after being vibrated out, resulting in leakage of the medicine liquid, which not only causes drug waste and increases the configuration cost, but also may pollute the working environment and pose a potential threat to the health of the operator; on the other hand, the vibration of the medicine bottle will interrupt the drug mixing process and affect the configuration efficiency. The operator needs to reinstall and fix the medicine bottle, which increases the manpower cost and time cost. If the vibration of the medicine bottle is not discovered in time, it may also cause the configured drug to fail to meet the dosage requirements, affect the patient's treatment effect, and even cause serious medical accidents.

[0004] In view of the above problems, there is an urgent need to improve the existing drug mixing device and develop a technology or device that can effectively prevent the medicine bottle from being shaken out of the mixing bottle insert during the oscillation process, so as to improve the safety, accuracy and efficiency of intravenous drug preparation. Summary of the invention

[0005] The purpose of the present invention is to provide a drug mixing device for an intravenous drug preparation center to solve the problem that in the process of the drug mixing device proposed in the above background technology promoting the mixing of multiple drug liquids in a medicine bottle by oscillation, due to the strong oscillation, there is a certain probability that the medicine bottle will be shaken out of the mixing medicine bottle insert tube, and the medicine bottle may break after being shaken out, resulting in leakage of drug liquid, which not only causes drug waste and increases preparation costs, but also may pollute the working environment.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a drug mixing device for an intravenous drug preparation center, comprising a drug mixing main unit and an oscillating base plate arranged on the upper side of the outer wall at the top of the drug mixing main unit, an axial hole is arranged inside the center of the drug mixing main unit, an oscillating transmission shaft is inserted in the axial hole, a flange is welded on the top of the oscillating transmission shaft, the flange is fixedly connected to the oscillating base plate by a plurality of screws, a cube drug fixing cover is arranged on the top of the oscillating base plate, a plurality of mixing medicine bottle inserts are inserted and fixed on the top of the cube drug fixing cover, and an oscillating anti-slip device is arranged on the rear end of the drug mixing main unit.

[0007] Preferably, the oscillation anti-slip device includes a metal fixing plate, a bracket fixing sleeve, a prism bracket, a lifting sleeve, an anti-slip baffle and a soft protective pad. The metal fixing plate is fixed to the rear end outer wall of the drug mixing main unit, a bracket fixing sleeve is welded to the rear end of the metal fixing plate, a prism bracket is inserted and fixed in the bracket fixing sleeve, a lifting sleeve is sleeved on the outside of the prism bracket, an anti-slip baffle is fixed on the outside of the lifting sleeve, the anti-slip baffle is located above the cube drug fixing cover, and a soft protective pad is glued and fixed to the outer wall of the bottom end of the anti-slip baffle.

[0008] Preferably, the oscillation anti-slip device also includes a height-fixing sleeve, an anti-slip sleeve and a height-fixing screw, the anti-slip sleeve is sleeved and fixed on the outside of the top end of the prism bracket, the height-fixing sleeve is sleeved on the outside of the prism bracket, and the height-fixing sleeve is located below the lifting sleeve, and the height-fixing screw is threadedly inserted on the right end of the height-fixing sleeve.

[0009] Preferably, the lifting sleeve and the height-fixing sleeve can move up and down outside the prism bracket, and the lifting sleeve and the height-fixing sleeve cannot rotate on the prism bracket. The height-fixing screw is a hand-tightened screw. After the height-fixing screw is tightened, the screw rod can tightly contact the outer wall of the right end of the prism bracket.

[0010] Preferably, the height fixing screw can fix the position of the height fixing sleeve after being tightened, and the soft protective pad is made of medical-grade soft silicone, and the area of ​​the soft protective pad is the same as the area of ​​the cube medicine fixing cover.

[0011] Preferably, an oscillating motor is arranged inside the drug mixing main unit, the output shaft of the oscillating motor is drivingly connected to the oscillating transmission shaft, shock-absorbing buffer feet are fixed at the four corners of the bottom end of the drug mixing main unit, and anti-slip bottom films are fixed at the bottom ends of multiple shock-absorbing buffer feet.

[0012] Preferably, a controller is fixed at the front end of the drug mixing host, a plurality of control buttons are arranged on the right side of the center of the front end of the controller, and a data display screen is arranged on the left side of the plurality of control buttons.

[0013] Preferably, the edges and corners of the drug mixing main unit and the cube-shaped drug fixing cover are passivated, and the rear end of the drug mixing main unit is densely covered with heat dissipation holes.

[0014] Compared with the prior art, the present invention provides a drug mixing device for an intravenous drug preparation center, which has the following beneficial effects:

[0015] The present invention adds a novel oscillating anti-slipping device at the rear end of the drug mixing main machine. When multiple medicine bottles containing liquid medicine are inserted into the mixing medicine bottle insert tube for oscillation and mixing, the high-frequency oscillation will have a certain probability of causing the medicine bottles to be vibrated out of the mixing medicine bottle insert tube, and the oscillating anti-slipping device can effectively prevent this situation from happening. The device protects the top or upper parts of the multiple medicine bottles inserted in the mixing medicine bottle insert tube through an anti-slipping baffle. When the medicine bottles are vibrated out due to the high-frequency oscillation, the anti-slipping baffle located at the top or upper part will prevent the medicine bottles from detaching from the mixing medicine bottle insert tube. In addition, the device can easily adapt to medicine bottles of various sizes through the cooperation of the height-fixing sleeve and the lifting sleeve, without the need to frequently replace the device or perform complicated adjustments, thereby greatly improving work efficiency and reducing the operating inconvenience and time waste caused by device adaptation problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a right-view stereoscopic structural schematic diagram of a drug mixing device for an intravenous drug preparation center according to the present invention.

[0017] Figure 2 It is a schematic diagram of the front plan structure of a drug mixing device for an intravenous drug preparation center according to the present invention.

[0018] Figure 3 It is a schematic diagram of the right-view plan structure of a drug mixing device for an intravenous drug preparation center according to the present invention.

[0019] Figure 4 It is a rear view stereoscopic structural schematic diagram of the oscillation anti-slip device of the present invention.

[0020] Figure 5 It is a schematic diagram of the right-side planar structure of the oscillation anti-slip device of the present invention.

[0021] In the figure: 1. shock-absorbing and buffering foot; 2. oscillating bottom plate; 3. drug mixing main unit; 4. anti-slip bottom film; 5. controller; 6. control buttons; 7. data display screen; 8. cube drug fixing cover; 9. mixing medicine bottle insert tube; 10. oscillation anti-slip device; 11. oscillation transmission shaft; 12. flange; 13. metal fixing plate; 14. bracket fixing sleeve; 15. prismatic bracket; 16. height-fixing sleeve; 17. lifting sleeve; 18. anti-slip sleeve; 19. height-fixing screw; 20. anti-slip baffle; 21. soft protective pad. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The present invention provides Figure 1-5 The drug mixing device shown in the figure for intravenous drug preparation center includes a drug mixing main unit 3 and an oscillating base plate 2 arranged on the upper side of the outer wall at the top of the drug mixing main unit 3. An axial hole is arranged inside the center of the drug mixing main unit 3, and an oscillating transmission shaft 11 is inserted in the axial hole. A flange 12 is welded to the top of the oscillating transmission shaft 11, and the flange 12 is fixedly connected to the oscillating base plate 2 by multiple screws. An oscillating motor is arranged inside the drug mixing main unit 3, and the output shaft of the oscillating motor is transmission-connected to the oscillating transmission shaft 11. The oscillating motor is the power source of the entire mixing process. When the oscillating motor is working, its output shaft starts to rotate, and drives the oscillating transmission shaft 11 to rotate synchronously through the transmission connection. Since the oscillating transmission shaft 11 is inserted in the axial hole of the drug mixing main unit 3, and the top is fixedly connected to the oscillating base plate 2 by the flange 12 and screws, the rotation of the oscillating transmission shaft 11 will be transmitted to the oscillating base plate 2, causing it to generate high-frequency oscillations, and rotate. The oscillating motor with output can efficiently convert electrical energy into rotational mechanical energy. This rotational motion can be stably transmitted to the oscillating drive shaft 11 through a transmission connection, thereby driving the oscillating base plate 2 to generate high-frequency oscillations. Due to the continuity and stability of the rotational motion, the frequency and amplitude of the oscillation can remain relatively stable, which is beneficial to the uniformity and consistency of drug mixing. For example, in the actual intravenous drug preparation process, stable oscillation can ensure that the mixing effects of drugs in different batches are similar, thereby ensuring the quality of drug preparation. A cube drug fixing cover 8 is provided on the top of the oscillating base plate 2. A plurality of mixing medicine bottle inserts 9 are plugged and fixed on the top of the cube drug fixing cover 8. The mixing medicine bottle inserts 9 are used to plug and fix medicine bottles. As the oscillating base plate 2 oscillates at a high frequency, the medicine bottles will also oscillate accordingly, and the medicine liquids in the medicine bottles are mixed with each other under the action of the oscillation, thereby achieving uniform mixing of the drugs and meeting the requirements of the intravenous drug preparation center for drug mixing.

[0024] like Figure 1 , Figure 2 and Figure 3As shown, shock-absorbing and buffering feet 1 are fixed at the four corners of the bottom of the drug mixing main unit 3, and anti-skid bottom films 4 are fixed at the bottom ends of multiple shock-absorbing and buffering feet 1. The shock-absorbing and buffering feet 1 can effectively absorb the vibration generated when the oscillation motor is working, reduce the impact of the vibration on the drug mixing main unit 3 and the placement plane, and avoid the displacement or damage of the equipment due to vibration. The anti-skid bottom film 4 further enhances the friction between the equipment and the placement plane to prevent the equipment from sliding during the oscillation process, ensuring that the equipment is always in a stable working position. A controller 5 is fixed at the front end of the drug mixing main unit 3, and a plurality of control buttons 6 are arranged on the right side of the front center of the controller 5. The plurality of control buttons 6 are used by the operator to control various functions of the drug mixing device. For example, the oscillation frequency, oscillation time and other parameters of the oscillation motor can be set through the control buttons 6 to meet the needs of mixing different drugs. A data display screen 7 is arranged on the left side of the plurality of control buttons 6. The data display screen 7 can intuitively display the operating status and related parameter information of the equipment to the operator. The operator can use the data display screen 7 in real time to Understanding data such as oscillation frequency, oscillation time, and equipment working time facilitates timely adjustment of the equipment operating status to ensure the accuracy and stability of the drug mixing process. The drug mixing host 3 and the square drug fixing cover 8 are all passivated on all edges and corners. This is for the safety of the operator. During daily operation, the operator may come into contact with the equipment. The passivated edges and corners can effectively avoid accidental injuries such as scratches caused by collisions to the operator, thereby ensuring the safety of the operator. The rear end of the drug mixing host 3 is densely covered with heat dissipation holes. The heat dissipation holes are to ensure the stable performance of the equipment during long-term operation. The oscillation motor will generate a lot of heat during operation. If the heat cannot be dissipated in time, the excessive temperature may affect the performance and life of the oscillation motor, and even cause equipment failure. The design of the heat dissipation holes allows the outside cold air to flow naturally into the equipment, forming convection with the internal hot air to dissipate the heat, thereby keeping the internal temperature of the equipment within a reasonable range and ensuring that the equipment can operate continuously and stably.

[0025] like Figure 1 , Figure 4 and Figure 5As shown, an oscillation anti-slip device 10 is provided at the rear end of the drug mixing main unit 3. The oscillation anti-slip device 10 includes a metal fixing plate 13, a bracket fixing sleeve 14, a prism bracket 15, a lifting sleeve 17, an anti-slip baffle 20 and a soft protective pad 21. The metal fixing plate 13 is fixed to the rear end outer wall of the drug mixing main unit 3. A bracket fixing sleeve 14 is welded to the rear end of the metal fixing plate 13. A prism bracket 15 is inserted and fixed in the bracket fixing sleeve 14. A lifting sleeve 17 is sleeved on the outside of the prism bracket 15. An anti-slip baffle 20 is fixed on the outside of the lifting sleeve 17. The anti-slip baffle 20 is located above the cube drug fixing cover 8. A soft protective pad 21 is pasted and fixed to the outer wall of the bottom end of the anti-slip baffle 20. The anti-slip baffle 20 is a core component of the oscillation anti-slip device 10 to realize the anti-slip function. It is fixed outside the lifting sleeve 17 and is located above the cube drug fixing cover 8. When the drug mixing main unit 3 is working and the oscillation bottom plate 2 drives the medicine bottle to oscillate at high frequency, the anti-slip baffle 20 can prevent the medicine from slipping off. The bottle falls out upward due to the excessive oscillation amplitude. At the same time, the fixed connection mode of the anti-slip baffle 20 and the lifting sleeve 17 and the close and reasonable cooperation between the various components ensure the stability and durability of the oscillation anti-slip device 10 in a long-term high-frequency oscillation environment. Even after long-term use, there will be no loosening or falling of components. It can always provide reliable anti-slip protection for the medicine bottle, thereby ensuring the smooth progress of the intravenous drug preparation process and reducing the drug waste and safety hazards caused by the vibration of the medicine bottle. The oscillation anti-slip device 10 also includes a height fixing sleeve 16, an anti-slip sleeve 18 and a height fixing screw 19. The anti-slip sleeve 18 is sleeved and fixed on the outside of the top of the prism bracket 15, and the height fixing sleeve 16 is sleeved on the outside of the prism bracket 15, and the height fixing sleeve 16 is located below the lifting sleeve 17. The right end of the height fixing sleeve 16 is threaded with a height fixing screw 19, and the height fixing screw 19 can accurately fix the position of the height fixing sleeve 16 to ensure that the positioning of the height fixing sleeve 16 is accurate and reliable.

[0026] like Figure 1 , Figure 4 and Figure 5As shown, the lifting sleeve 17 and the height-fixing sleeve 16 can both move up and down outside the prism bracket 15, and the lifting sleeve 17 and the height-fixing sleeve 16 cannot rotate on the prism bracket 15. The height-fixing screw 19 is a hand-tightened screw. After the height-fixing screw 19 is tightened, the screw rod can tightly contact the outer wall of the right end of the prism bracket 15. The matching design of the lifting sleeve 17 and the height-fixing sleeve 16 on the prism bracket 15 is the key to realizing the flexible adjustment of the anti-slip function. The lifting sleeve 17 and the height-fixing sleeve 16 can both move up and down outside the prism bracket 15. This design gives the device the ability to adapt to medicine bottles of different heights. For a taller medicine bottle, the lifting sleeve 17 can be adjusted upward, and for a shorter medicine bottle, the lifting sleeve 17 can be adjusted downward, thereby ensuring that the anti-dropping baffle 20 can be accurately located at a suitable height, and effectively preventing the medicine bottle from dropping out. At the same time, in order to ensure the stability and positioning accuracy of the device during the adjustment process, the lifting sleeve 17 and the height-fixing sleeve 16 cannot rotate on the prism bracket 15. The height-fixing screw 19 threadedly inserted at the right end of the height-fixing sleeve 16 plays an important positioning role. The height-fixing screw 19 is a hand-tightening screw. When the operator adjusts the height-fixing sleeve 16 according to the height of the medicine bottle, the height-fixing screw 19 is a hand-tightening screw. After the medicine bottle is in the position, tighten the height-fixing screw 19, and the screw rod will tightly contact the outer wall of the right end of the prism bracket 15, thereby fixing the height-fixing sleeve 16 in position, and the height-fixing sleeve 16 limits the lowest position of the downward movement of the lifting sleeve 17, ensuring that the anti-dropping baffle 20 can be maintained at a suitable height range at different medicine bottle heights, thereby achieving reliable anti-dropping protection for the medicine bottle. After the height-fixing screw 19 is tightened, the height-fixing sleeve 16 can be fixed in position. The soft protective pad 21 is made of medical-grade soft silicone, and the area of ​​the soft protective pad 21 is the same as that of the cube medicine fixing cover 8. The protective pad 21 can not only enhance the anti-slip effect, but also protect the medicine bottle. The soft protective pad 21 is made of medical-grade soft silicone and has a soft texture. It can effectively buffer the impact force between the anti-slip baffle 20 and the medicine bottle, avoiding hard damage to the medicine bottle during the anti-slip process. Moreover, the area of ​​the soft protective pad 21 is the same as the area of ​​the cube medicine fixing cover 8, which can fully cover the area where the medicine bottle may contact the anti-slip baffle 20, providing all-round protection for the medicine bottle, ensuring the integrity and safety of the medicine bottle during the entire oscillation and mixing process, thereby ensuring the smooth progress of intravenous drug preparation.

[0027] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A drug mixing device for an intravenous drug preparation center, comprising a drug mixing main unit (3) and an oscillating bottom plate (2) arranged on the upper side of the outer wall of the top end of the drug mixing main unit (3), wherein an axial hole is arranged inside the center of the drug mixing main unit (3), an oscillating transmission shaft (11) is inserted into the axial hole, a flange (12) is welded to the top end of the oscillating transmission shaft (11), and the flange (12) is fixedly connected to the oscillating bottom plate (2) by a plurality of screws, characterized in that: The top of the oscillating bottom plate (2) is provided with a cube medicine fixing cover (8), the top of which is plugged and fixed with a plurality of mixed medicine bottle inserting tubes (9), and the rear end of the medicine mixing main unit (3) is provided with an oscillating anti-slip device (10); The oscillation anti-slip device (10) comprises a metal fixing plate (13), a bracket fixing sleeve (14), a prism bracket (15), a lifting sleeve (17), an anti-slip baffle (20) and a soft protective pad (21); the metal fixing plate (13) is fixed to the rear end outer wall of the drug mixing main unit (3); the rear end of the metal fixing plate (13) is welded with a bracket fixing sleeve (14); the prism bracket (15) is inserted and fixed in the bracket fixing sleeve (14); the outer part of the prism bracket (15) is sleeved with a lifting sleeve (17); the outer part of the lifting sleeve (17) is fixed with an anti-slip baffle (20); the anti-slip baffle (20) is located above the cube drug fixing cover (8); and the bottom end outer wall of the anti-slip baffle (20) is glued and fixed with a soft protective pad (21).

2. A drug mixing device for intravenous drug preparation center according to claim 1, characterized in that: The oscillation anti-slip device (10) further comprises a height-fixing sleeve (16), an anti-slip sleeve (18) and a height-fixing screw (19); the anti-slip sleeve (18) is sleeved and fixed on the outside of the top end of the prism bracket (15); the height-fixing sleeve (16) is sleeved on the outside of the prism bracket (15), and the height-fixing sleeve (16) is located below the lifting sleeve (17); and the height-fixing screw (19) is threadedly inserted at the right end of the height-fixing sleeve (16).

3. A drug mixing device for intravenous drug preparation center according to claim 2, characterized in that: The lifting sleeve (17) and the height-fixing sleeve (16) can both move up and down outside the prism bracket (15), and the lifting sleeve (17) and the height-fixing sleeve (16) cannot rotate on the prism bracket (15). The height-fixing screw (19) is a hand-tightening screw. After the height-fixing screw (19) is tightened, the screw rod can tightly contact the outer wall of the right end of the prism bracket (15).

4. A drug mixing device for intravenous drug preparation center according to claim 3, characterized in that: The height fixing screw (19) can play a role in fixing the position of the height fixing sleeve (16) after being tightened. The soft protective pad (21) is made of medical-grade soft silica gel, and the area of ​​the soft protective pad (21) is the same as the area of ​​the cube-shaped medicine fixing cover (8).

5. The drug mixing device for intravenous drug preparation center according to claim 1, characterized in that: An oscillating motor is arranged inside the drug mixing main machine (3), and the output shaft of the oscillating motor is in driving connection with the oscillating transmission shaft (11). Shock-absorbing and buffering feet (1) are fixed at the four corners of the bottom end of the drug mixing main machine (3), and anti-slip bottom sheets (4) are fixed at the bottom ends of the plurality of shock-absorbing and buffering feet (1).

6. A drug mixing device for intravenous drug preparation center according to claim 5, characterized in that: A controller (5) is fixed at the front end of the drug mixing main unit (3), a plurality of control buttons (6) are arranged on the right side of the center of the front end of the controller (5), and a data display screen (7) is arranged on the left side of the plurality of control buttons (6).

7. The drug mixing device for intravenous drug preparation center according to claim 1, characterized in that: The edges and corners of the drug mixing main unit (3) and the cube-shaped drug fixing cover (8) are all passivated, and the rear end of the drug mixing main unit (3) is densely covered with heat dissipation holes.