Intravenous injection medicine preparation device

Abstract

The invention discloses an intravenous injection medicine preparation device. The intravenous injection medicine preparation device comprises an outer cylinder and an inner pushing assembly. The outer cylinder comprises a cylinder body and an inner guide piece; wherein the inner guide piece is arranged in the cylinder body, and the inner guide piece and the cylinder body are arranged in a concentric circle shape; the inner pushing assembly comprises a pulling piece and a stirring part; the bottom end of the pulling piece is inserted into the barrel, and the top of the pulling piece is arranged outside the barrel. The stirring part is composed of a stirring piece, a transmission piece and a pushing piece; wherein the pushing piece is arranged in the pulling piece and synchronously moves along with the pulling piece in a single direction; through the design, the stirring part is additionally arranged in the internal structure of a conventional configuration device, after various liquid medicines are sucked through the configuration device, the stirring part can directly and fully stir the sucked liquid medicines, and the situation that the various liquid medicines are injected into the same container one by one and then mixed through manual shaking is not needed; through the improvement, the liquid medicine mixing process is more convenient and efficient.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medicine configurator, and particularly relates to a medicine configurator for intravenous injection. BACKGROUND

[0002] In the medical operation of intravenous injection, in order to ensure the safety and effectiveness of the medicine, various medicines or solvents (such as physiological saline, glucose solution, etc.) need to be accurately mixed and injected into the human body. This not only ensures that the concentration of the medicine in the solution is uniform and consistent, but also ensures that the stability of the medicine meets the clinical requirements, avoiding the influence on the curative effect due to the degradation or deterioration of the medicine. More importantly, sufficient mixing can effectively prevent the local concentration of the medicine from being too high, thereby avoiding possible adverse reactions such as vascular pain and damage caused by phlebitis, or serious problems such as blockage of the infusion pipeline caused by medicine precipitation. Therefore, sufficient and uniform mixing is undoubtedly the core link in the medicine configuration process.

[0003] However, in the current clinical practice, the conventional medicine mixing operation mode still has certain limitations. Specifically, medical staff usually need to use a syringe to accurately inject various medicines one by one into the same container, and then rely on manual shaking action to realize the sufficient mixing of the medicines. This process seems simple, but it is actually quite time-consuming. Each step of operation needs to be careful to ensure that the medicine dosage is accurate and to avoid cross contamination. Especially in the face of emergency medicine scenes, such as rescuing critically ill patients, this time-consuming mixing method undoubtedly prolongs the preparation time of the medicine, which may affect the rescue efficiency. In addition, when the types of medicines to be mixed are more or the dosage is larger, the tediousness of manual operation is further aggravated, which not only increases the working strength of the medical staff, but also greatly reduces the efficiency of the overall configuration process, making it difficult to meet the needs of efficient medical treatment. SUMMARY

[0004] The purpose of the present application is to provide a medicine configurator for intravenous injection which can directly complete the mixing of the medicine solution and inject it into the human body, so as to solve the problem of the current conventional mixing of medicines by manual injection and shaking one by one, which is time-consuming, and the efficiency is lower in emergency or large amount.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a medicine configurator for intravenous injection, comprising an outer cylinder and an inner pushing assembly; The outer cylinder comprises a cylinder body and an inner guide; The inner guide is arranged inside the cylinder body, and the two are arranged in a concentric circle shape; The inner pushing assembly comprises a pulling member and a stirring part; The bottom end of the pulling member is inserted into the inside of the cylinder body, and the top part is arranged outside the cylinder body; The stirring part is composed of a stirring member, a transmission member and a pushing member; The pushing member is placed inside the pulling member and moves synchronously with the pulling member in a single direction; The transmission member is integrally arranged at the upper middle position of the pusher, and is connected to the inner guide member and performs rotational motion under the guidance of the inner guide member; The stirring member is arranged at the bottom end of the pushing member and moves synchronously with the pushing member.

[0006] As a preferred technical solution of the present invention, the inner guide member includes a connecting tube and a connecting rod made of plastic material; The outer surface of the connecting tube is provided with annular grooves equidistant from top to bottom, and a socket is provided through the end of the connecting tube. The inner wall of the connecting tube is provided with a spiral groove, which is connected to the transmission member. The setting of the spiral groove can guide the direction of travel of the transmission member during its ascent, thereby achieving the purpose of rotating the transmission member. The connecting rod is arranged inside the socket, and both ends of the connecting rod extend out of the connecting tube, and the two ends of the connecting rod are respectively located at the upper and lower ends of the pulling member; Among them, the top inner wall of the cylinder is formed with an annular protrusion that is staggered and locked with the annular groove. Through the locking connection between the annular protrusion and the annular groove, the connecting cylinder and the cylinder can be quickly assembled.

[0007] As a preferred technical solution of the present invention, the pulling member includes a push rod, a sleeve rod, and an end plate; The top of the push rod is located outside the cylinder, and the end plate is fixed to the top of the push rod; The sleeve rod is located below the push rod, and the two are coaxially arranged, and the sleeve rod is placed inside the cylinder as a whole; The push rod and the sleeve rod are disconnected, with a spacing therebetween for placing a transmission member, and a non-through hole is opened upward at the center of the bottom end of the push rod, while a completely through hole is opened at the center of the sleeve rod. The holes on the push rod and the sleeve rod are used to accommodate the push member and drive the push member to move in a single direction, that is, when the end plate is pulled, the push rod is driven to move, and then the push rod drives the sleeve rod to move through the connecting rod. At this time, the transmission member is pushed toward the inside of the barrel by the push rod and the sleeve rod to achieve the purpose of injection, or pulled toward the outside of the barrel to achieve the purpose of liquid extraction; The two ends of the connecting rod are respectively located at the top of the push rod and the two sides of the bottom of the sleeve rod, and there are limit members running through the connecting rod and the push rod, and between the connecting rod and the sleeve rod. The push rod, the connecting rod and the sleeve rod are connected by the limit members, so that when the push rod is pulled through the end plate, the sleeve rod can be pulled synchronously through the connecting rod.

[0008] As a preferred technical scheme in the present application, the two ends of the connecting rod are provided with round holes for the limiting members to pass through, and the limiting members are fixedly connected with the push rod and the sleeve rod; The limiting member comprises a stud and a columnar body. When the limiting member is a stud, only one end of the limiting member has a thread. During installation, the limiting member is first passed through the round hole on the connecting rod and screwed into the push rod and the sleeve rod. Similarly, the push rod and the sleeve rod should be provided with screw holes for the stud to screw into. When the limiting member is a columnar body, during installation, the limiting member is passed through the round hole on the connecting rod until one end of the limiting member is in contact with the surface of the push rod and the sleeve rod, and then the two are connected by means of heat melting. In actual processing, corresponding adjustments can be made according to the production equipment and requirements.

[0009] As a preferred technical scheme in the present application, the pusher comprises an inner rod, a piston head, and a sealing ring. The inner rod is divided into two sections and is arranged in the holes of the push rod and the sleeve rod, respectively. The piston head is fixedly arranged at the bottom of the inner rod, and the piston head as a whole is arranged outside the bottom of the sleeve rod. An arc-shaped protrusion is formed on the bottom end surface of the piston head. The arc-shaped protrusion can improve the efficiency of stirring the liquid medicine and make the mixing effect better. Of course, the shape and number of the arc-shaped protrusions can be changed in actual processing. A connecting cylinder is fixedly arranged at the top of the piston head, and a through hole is formed in the bottom of the piston head and extends into the connecting cylinder. The sealing ring is arranged outside the top of the piston head. The sealing ring is seamlessly in contact with the inner wall of the cylinder. The sealing ring can further eliminate the gap between the piston head and the cylinder, so that the liquid medicine does not seep out during pumping.

[0010] As a preferred technical scheme in the present application, the bottom of the sealing ring is integrally formed with a clamping portion with an isosceles trapezoidal longitudinal section. The entire sealing ring, the abutting portion, and the clamping portion are made of rubber, which has the same material as the piston head of the existing conventional syringe. Therefore, the clamping portion can ensure the stability of the connection after being clamped by deformation. A groove is formed in the top of the piston head for the clamping portion to be clamped into. The groove is not marked in the figure. One side of the sealing ring extends towards the bottom of the piston head and forms an abutting portion, which is arranged outside the outer wall of the piston head.

[0011] As a preferred technical scheme in the present application, the transmission member is a middle column and a connecting member. The middle column is fixedly arranged at the middle of the inner rod, and the connecting member is integrally formed on the middle column and connected with the spiral groove.

[0012] As a preferred technical scheme in the present application, the stirring part comprises a spring and a stirring rod. The stirring rod is arranged in the cavity formed by the through hole of the connecting cylinder, and a sealing plug is further arranged at the top of the stirring rod, wherein the material of the sealing plug is consistent with the material of the piston head of a conventional syringe, and the sealing plug is mainly used for sealing. In order to ensure the sealing type, the diameter of the stirring rod should be equal to the diameter of the through hole, and the diameter of the sealing plug should be greater than the inner diameter of the through hole. At the same time, the friction between the through hole and the sealing plug should be less than the elastic force of the compressed spring. The spring is arranged between the sealing plug and the connecting cylinder. When the drug liquid is not sucked or injected, the spring is hidden in the connecting cylinder by compression. When the drug liquid is sucked, the stirring rod is popped out by the spring.

[0013] As a preferred technical scheme in the present application, the top of the connecting cylinder and the bottom end of the connecting rod are spaced apart. In actual processing, they can also be arranged in a flat and adhered state. As long as they do not abut each other, the connecting cylinder and the sleeve rod are not in contact with each other.

[0014] As a preferred technical scheme in the present application, the bottom of the cylinder body is formed with a needle sleeve, that is, a hollow cylindrical structure at the bottom end of the cylinder body. The needle is sleeved on the needle sleeve, and the drug liquid is extracted through the needle inserted into the drug liquid container.

[0015] Compared with the prior art, the present application has the following advantages: Through the design of the present application, the stirring part is added to the internal structure of the conventional configuration device. After a plurality of drug liquids are sucked through the configuration device, the stirring part can directly fully stir the sucked drug liquids. After mixing, the drug liquids can be directly injected into the human body through the needle. It is not necessary to inject a plurality of drug liquids into the same container one by one and then rely on manual shaking to realize mixing. This improvement makes the drug liquid mixing process more convenient and efficient, greatly shortens the time required for drug liquid configuration, especially suitable for emergency medication or large amount of drug liquid mixing scene, and can effectively improve the medical work efficiency. In addition, the stirring part fully considers the space utilization rate in the design. When not in use, it can be hidden and placed in a specific position inside the configuration device, without occupying the internal space of the configuration device, thereby ensuring the compactness and rationality of the overall structure of the configuration device. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic view of the overall structure of the intravenous injection drug configuration device. Figure 2 It is a sectional view of the intravenous injection drug configuration device. Figure 3 It is a schematic view of the internal pushing assembly. Figure 4 It is a sectional view of the internal pushing assembly. Figure 3 ​ Figure 5 For Figure 4 Enlarged view of the A region; Figure 6 For the structure diagram of one stirring part; Figure 7 For the connection diagram of the connecting barrel and the connecting rod; Figure 8 For Figure 5 Enlarged view of the B region; Figure 9 For the structure diagram of another stirring part.

[0017] In the figure: 100, barrel; 101, push rod; 101a, limiting piece; 102, sleeve rod; 103, end plate; 200, connecting barrel; 200a, insertion hole; 200b, spiral groove; 200c, ring groove; 201, connecting rod; 301, inner rod; 302, middle column; 302a, spiral protrusion; 302b, protruding point; 303, piston head; 303a, arc protrusion; 303b, through hole; 304, connecting barrel; 305, sealing ring; 305a, fitting part; 305b, clamping part; 306, spring; 307, stirring rod; 307a, sealing plug. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0019] Please refer to Figures 1 to 9 The present application provides a technical solution: a intravenous injection drug dispenser, which comprises an outer barrel and an inner push assembly; The outer barrel comprises a barrel 100, an inner guide; The inner guide is placed inside the barrel 100, and both are arranged in concentric circles; The inner push assembly comprises a pulling member and a stirring part; The bottom end of the pulling member is inserted into the inside of the barrel 100, and the top is placed outside the barrel 100; The stirring part is composed of a stirring member, a transmission member, and a pushing member; The pushing member is arranged inside the pulling member and moves synchronously with the pulling member in a single direction. The transmission member is integrally arranged at the middle upper position of the pushing member, and the transmission member is connected with the inner guide and rotates under the guidance of the inner guide. The stirring member is arranged at the bottom end of the pushing member and moves synchronously with the pushing member.

[0020] In the embodiment, referring to Figure 2 , Figure 3 , Figure 4 , Figure 7 , the inner guide comprises a connecting cylinder 200 and a connecting rod 201 which are made of plastic material. The outer part of the connecting cylinder 200 is provided with ring grooves 200c at equal intervals from top to bottom, and the interval between every two adjacent ring grooves 200c is controlled within 0.2-0.5 mm, so that the thickness can realize the deformation of the ring groove 200c and achieve the connection with the annular protrusion in the later insertion. A plug hole 200a is provided at the end of the connecting cylinder 200, and a spiral groove 200b is provided on the inner wall of the connecting cylinder 200, which is connected with the transmission member. Through the arrangement of the spiral groove 200b, the transmission member can be guided in the direction of movement to achieve the purpose of rotating the transmission member. The connecting rod 201 is arranged inside the plug hole 200a, and the two ends of the connecting rod 201 extend to the outside of the connecting cylinder 200, and the two ends of the connecting rod 201 are respectively located at the upper and lower end positions of the pulling member. The inner wall of the top of the cylinder body 100 is formed with an annular protrusion which is staggered and clamped with the ring groove 200c. For details, refer to Figure 2 Through the clamping connection of the annular protrusion and the ring groove 200c, the connecting cylinder 200 and the cylinder body 100 can be quickly assembled.

[0021] In the embodiment, referring to Figure 2 , Figure 3 , Figure 4 , the pulling member comprises a push rod 101, a sleeve rod 102 and an end plate 103. The top of the push rod 101 is located outside the cylinder body 100, and the end plate 103 is fixedly arranged at the top end of the push rod 101. The sleeve rod 102 is arranged below the push rod 101 and coaxially arranged with the push rod 101, and the sleeve rod 102 is arranged inside the cylinder body 100. Wherein, the push rod 101 and the sleeve rod 102 are disconnected, and there is a space between them for the transmission member to be placed, and a non-through hole is formed in the center of the bottom end of the push rod 101, and a completely through hole is formed in the center of the sleeve rod 102, the holes on the push rod 101 and the sleeve rod 102 are used to accommodate the pushing member and drive the pushing member to move in a single direction, that is, when the end plate 103 is pulled, it will drive the push rod 101 to move, then the push rod 101 drives the sleeve rod 102 to move through the connecting rod 201, at this time, the transmission member is pushed towards the inside of the barrel 100 by the push rod 101 and the sleeve rod 102, achieving the purpose of injection, or pulled towards the outside of the barrel 100, achieving the purpose of taking liquid; The two ends of the connecting rod 201 are respectively on the top of the push rod 101 and the bottom of the sleeve rod 102, and the connecting rod 201 is penetrated by the limiting piece 101a between the push rod 101 and the sleeve rod 102, in order to better reflect the limiting piece 101a, it can also be referred to Figure 6 The state shown in the figure, the push rod 101, the connecting rod 201 and the sleeve rod 102 are connected by the limiting piece 101a, so that when the push rod 101 is pulled by the end plate 103, the sleeve rod 102 can be pulled synchronously by the connecting rod 201.

[0022] In this embodiment, the two ends of the connecting rod 201 are provided with circular holes for the limiting piece 101a to penetrate, which are not shown in the figure, and the limiting piece 101a is fixedly connected with the push rod 101 and the sleeve rod 102; The limiting piece 101a includes a stud and a columnar body. When the limiting piece 101a is a stud, only one end of the limiting piece 101a has a thread, and in installation, the limiting piece 101a is first penetrated through the circular hole on the connecting rod 201 and screwed into the push rod 101 and the sleeve rod 102, and the push rod 101 and the sleeve rod 102 should be provided with screw holes for the stud to screw into; When the limiting piece 101a is a columnar body, in installation, the limiting piece 101a is penetrated through the circular hole on the connecting rod 201 until the end of the limiting piece 101a is in contact with the surface of the push rod 101 and the sleeve rod 102, and then the two are connected by heat melting, and in actual processing, corresponding adjustment can be made according to production equipment and demand.

[0023] In this embodiment, referring to Figure 2 , Figure 3 , Figure 5 , Figure 6 The pushing member includes an inner rod 301, a piston head 303 and a sealing ring 305. The inner rod 301 is divided into two sections and is placed in the holes of the push rod 101 and the sleeve rod 102 respectively; The piston head 303 is fixed at the bottom of the inner rod 301, and the piston head 303 is entirely outside the bottom of the sleeve rod 102. An arc-shaped protrusion 303a is formed at the bottom end face of the piston head 303. Through the setting of the arc-shaped protrusion 303a, the efficiency of stirring the liquid medicine can be improved, and the mixing effect is better. Of course, in actual processing, the shape and number of the arc-shaped protrusion 303a can be changed accordingly. In this embodiment, only one of the arc-shaped protrusions 303a is shown. Figure 3 Referring to Figure 8 The top of the piston head 303 is fixed with a connecting cylinder 304, and a through hole 303b is formed at the bottom of the piston head 303 upwards, which extends into the connecting cylinder 304. A sealing ring 305 is sleeved outside the top of the piston head 303. The sealing ring 305 is seamlessly fitted with the inner wall of the cylinder body 100. Through the setting of the sealing ring 305, the gap between the piston head 303 and the cylinder body 100 can be further eliminated, so that there is no liquid medicine leakage during the pumping of the liquid medicine.

[0024] In this embodiment, referring to Figure 8 The bottom of the sealing ring 305 is integrally formed with a clamping portion 305b with an isosceles trapezoidal longitudinal section. The entire sealing ring 305, the fitting portion 305a, and the clamping portion 305b are all made of rubber material, which is the same as the material of the piston head of the existing conventional syringe. Therefore, the clamping portion 305b can ensure the stability of the connection through the clamping after deformation. A groove is formed at the top of the piston head 303 for the clamping portion 305b to clamp into. The groove is not marked in the figure. One side of the sealing ring 305 extends towards the bottom of the piston head 303 and forms a fitting portion 305a, which is sleeved on the outer wall of the piston head 303, Figure 8 The inner wall position of the fitting portion 305a shown in the fitting portion 305a is inclined. This is to reflect the state of easy insertion of the fitting portion 305a. In use, the inner wall of the fitting portion 305a should be set to be completely fitted with the outer wall of the piston head 303.

[0025] In this embodiment, the transmission member is the middle column 302 and the connecting member. The middle column 302 is fixed at the middle part of the inner rod 301. The connecting member is integrally formed on the middle column 302 and connected with the spiral groove 200b. Referring to Figure 6 The connecting member is a spiral protrusion 302a, which is rotationally connected with the spiral groove 200b through the spiral protrusion 302a. Referring to Figure 9 The connecting member is a protruding point 302b, which is rotationally connected with the spiral groove 200b through the protruding point 302b.

[0026] In this embodiment, referring to Figure 5 and Figure 6The stirring member includes a spring 306 and a stirring rod 307. The stirring rod 307 is arranged in the cavity formed by the through hole 303b of the connecting cylinder 304, and a sealing plug 307a is arranged at the top of the stirring rod 307. The material of the sealing plug 307a is consistent with the material of the piston head of a conventional syringe, and the sealing plug 307a is mainly used for sealing. In order to ensure the sealing type, the diameter of the stirring rod 307 should be equal to the diameter of the through hole 303b, and the diameter of the sealing plug 307a should be greater than the inner diameter of the through hole 303b. At the same time, the friction between the through hole 303b and the sealing plug 307a should be less than the rebound force of the compressed spring 306. The spring 306 is arranged between the sealing plug 307a and the connecting cylinder 304. Through the arrangement of the spring 306, the stirring rod 307 can be hidden in the connecting cylinder 304 by compressing the spring 306 when the drug liquid is not sucked or injected. When the drug liquid is sucked, the spring 306 can pop out the stirring rod 307.

[0027] In the embodiment, the top of the connecting cylinder 304 and the bottom end of the connecting rod 201 are spaced apart. In actual processing, the two can also be arranged in a planar adhering manner, as long as the two do not abut each other. The connecting cylinder 304 and the sleeve rod 102 are not in contact with each other.

[0028] In the embodiment, the bottom of the cylinder body 100 is formed with a needle sleeve, that is, a hollow cylindrical structure at the bottom end of the cylinder body 100. The needle sleeve is sleeved with a needle, and the needle is not shown. The needle is inserted into a drug liquid container to extract the drug liquid.

[0029] The working principle of the intravenous injection drug dispenser is described as follows: When the drug solution needs to be configured, the medical staff first pulls the end plate 103, drives the push rod 101 to move upward, the push rod 101 pulls the sleeve rod 102 to move upward through the connecting rod 201 (the two ends of the connecting rod 201 penetrate through the limiting part 101a, which ensures that the push rod 101 and the sleeve rod 102 move synchronously), and lifts the middle column 302, so that the negative pressure is formed in the inner part of the barrel 100, and the drug solution is sucked into the barrel 100 through the needle; in this process, with the upward movement of the pulling part (the push rod 101 and the sleeve rod 102), the inner rod 301 rises synchronously, the middle column 302 and the connecting part (the spiral protrusion 302a or the convex point 302b) on the middle column 302 rotate in the spiral groove 200b in the inner connecting cylinder 200, and then drive the stirring part to work, specifically: when the drug solution is sucked, the stirring rod 307 is ejected from the through hole 303b of the connecting cylinder 304 under the elastic force of the spring 306, and cooperates with the arc-shaped protrusion 303a at the bottom of the piston head 303 to stir the drug solution, so that the direct mixing of multiple drug solutions is realized, and there is no need to manually shake after the drug solutions are injected into the same container one by one; after the stirring is completed, the push rod 101 and the sleeve rod 102 are moved downward by the push end plate 103, the mixed drug solution is pushed out of the barrel 100, and is directly injected into the human body through the needle, in the whole process, the stirring rod 307 is limited by the bottom end face in the inner part of the barrel 100, and is moved to the connecting cylinder 304 again, and is hidden in the inner part of the configuration device when not in use, the stirring part is designed to be hidden, which does not occupy additional space, the needle is directly connected to the bottom of the configuration device, the human body can be immediately injected after the mixing is completed, which meets the clinical operation habit.

[0030] Although the embodiments of the present application have been shown and described in detail (see the above detailed description), it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An intravenous drug dispenser, characterized in that: The intravenous drug dispenser includes an outer barrel and an inner push assembly; The outer cylinder comprises a cylinder body (100) and an inner guide member; The inner guide member is placed inside the cylinder (100), and the two are arranged in a concentric circle shape; The inner push assembly includes a pulling member and a stirring portion; The bottom end of the pulling member is inserted into the interior of the cylinder (100), while the top end is placed outside the cylinder (100); The stirring part is composed of a stirring member, a transmission member, and a pushing member; The pushing member is placed inside the pulling member and moves synchronously with the pulling member in a single direction; The transmission member is integrally arranged at the upper middle position of the pusher, and is connected to the inner guide member and performs rotational motion under the guidance of the inner guide member; The stirring member is arranged at the bottom end of the pushing member and moves synchronously with the pushing member.

2. The intravenous drug dispenser according to claim 1, characterized in that: The inner guide member comprises a connecting cylinder (200) and a connecting rod (201); The exterior of the connecting cylinder (200) is provided with annular grooves (200c) equidistantly from top to bottom, a socket (200a) is provided through the end of the connecting cylinder (200), and a spiral groove (200b) is provided on the inner wall of the connecting cylinder (200), the spiral groove (200b) being connected to a transmission member; The connecting rod (201) is arranged to penetrate the interior of the socket (200a), and both ends of the connecting rod (201) extend to the outside of the connecting cylinder (200), and the two ends of the connecting rod (201) are respectively located at the upper and lower ends of the pulling member; The top inner wall of the cylinder (100) is formed with an annular protrusion that interlocks with the annular groove (200c).

3. The intravenous drug dispenser according to claim 2, characterized in that: The pulling member comprises a push rod (101), a sleeve rod (102), and an end plate (103); The top of the push rod (101) is located outside the cylinder (100), and the end plate (103) is fixed to the top of the push rod (101); The sleeve rod (102) is located below the push rod (101), and the two are coaxially arranged. The sleeve rod (102) is entirely placed inside the cylinder (100); The push rod (101) and the sleeve rod (102) are disconnected, with a spacing therebetween for placing a transmission member, and a non-through hole is provided at the center of the bottom end of the push rod (101), while a completely through hole is provided at the center of the sleeve rod (102). The holes on the push rod (101) and the sleeve rod (102) are used to accommodate the push member and drive the push member to move in a single direction. The two ends of the connecting rod (201) are respectively located at the top of the push rod (101) and the two sides of the bottom of the sleeve rod (102), and the limiting member (101a) passes through the connecting rod (201) and the push rod (101), and between the connecting rod (201) and the sleeve rod (102).

4. The intravenous drug dispenser according to claim 3, characterized in that: Circular holes for the limiting member (101a) to pass through are provided at both ends of the connecting rod (201), and the limiting member (101a) is fixedly connected to the push rod (101) and the sleeve rod (102).

5. The intravenous drug dispenser according to claim 3, characterized in that: The pushing member comprises an inner rod (301), a piston head (303), and a sealing ring (305); The inner rod (301) is divided into two sections, and is respectively placed in the holes of the push rod (101) and the sleeve rod (102); The piston head (303) is fixed to the bottom of the inner rod (301), and the piston head (303) is located outside the bottom of the sleeve rod (102). An arc-shaped protrusion (303a) is formed on the bottom end surface of the piston head (303). A connecting tube (304) is fixed to the top of the piston head (303), and a through hole (303b) is opened upward at the bottom of the piston head (303), and the through hole (303b) extends into the connecting tube (304). The sealing ring (305) is sleeved on the outer side of the top of the piston head (303), and the sealing ring (305) is seamlessly fitted to the inner wall of the cylinder (100).

6. The intravenous drug dispenser according to claim 5, characterized in that: The bottom of the sealing ring (305) is integrally formed with a clamping portion (305b) having an isosceles trapezoidal longitudinal section, and a groove for the clamping portion (305b) to be clamped is provided on the top of the piston head (303). One side of the sealing ring (305) extends toward the bottom of the piston head (303) and is formed with a fitting portion (305a), which is sleeved on the outer wall of the piston head (303).

7. The intravenous drug dispenser according to claim 5, characterized in that: The transmission member is a center column (302), a connecting member; The middle column (302) is fixed to the middle portion of the inner rod (301); and the connecting piece is integrally formed on the middle column (302) and connected to the spiral groove (200b).

8. The intravenous drug dispenser according to claim 5, characterized in that: The stirring member includes a spring (306) and a stirring rod (307); The stirring rod (307) is arranged in a cavity formed by the through hole (303b) of the connecting cylinder (304), and a sealing plug (307a) is also provided on the top of the stirring rod (307); The spring (306) is located between the sealing plug (307a) and the connecting tube (304).

9. The intravenous drug dispenser according to claim 8, characterized in that: A gap is left between the top of the connecting tube (304) and the bottom end of the connecting rod (201), and the connecting tube (304) and the sleeve rod (102) do not contact each other.

10. The intravenous drug dispenser according to claim 1, characterized in that: A needle sleeve is formed at the bottom of the cylinder (100), and a needle head is sleeved on the needle sleeve.

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