Puncture-proof, air-pressure-balanced and closed leakage-proof dispensing and pipetting assembly

Abstract

According to the puncture-proof air-pressure-balanced and closed leakage-proof medicine dispensing and pipetting assembly, a medicine dispensing and pipetting device is provided with a double-chamber injection part and a medicine dispensing needle part, and during medicine dispensing, the medicine dispensing needle part is communicated with a medical container or a connector through a pipetting communicating vessel; the first syringe can be used for extracting or injecting liquid medicine into a medical container or a connector through the injection needle seat and the first needle tube, and the second syringe can be used for supplementing or exhausting gas into the medical container or the connector through the injection needle seat and the second needle tube, so that the air pressure in the container or the connector is balanced; meanwhile, the needle point parts of the first needle tube and the second needle tube only penetrate out of a container or a connector during dispensing, and the remaining parts are wrapped in the needle head sealing part, so that liquid medicine of the dispensing needle is prevented from leaking, and in various conditions, the needle points of the first needle tube and the second needle tube are both located in the butt-joint outer sleeve, so that the safety of the dispensing needle is improved. Therefore, the puncture injury caused by the needle tip is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of medical devices, and in particular relates to a puncture-proof air pressure balance and closed and leak-proof medicine dispensing and liquid transfer component. Background Art

[0002] Dangerous drugs, represented by chemotherapy drugs, are extremely harmful to the health of medical staff who have been engaged in the preparation and transportation of such drugs for a long time, such as carcinogenesis, damage to internal organs, DNA damage, reproductive problems, miscarriage and teratogenesis. Existing data show that the incidence of cancer among pharmacists, nurses and other personnel who have long-term contact with dangerous drugs is 3-10 times higher than that of the general population, and the risk of infertility or miscarriage is 2-5 times higher. To this end, some medical institutions have built various clean rooms, biological cabinets and other facilities to reduce the risk of drug leakage. The investment is large, but the actual promotion and application effect is not good. There is a great demand for closed liquid transfer devices in the domestic diagnosis and treatment links, but there are few choices. The product is required to be not only airtight, but also low in cost and easy to use. In recent years, BD Company in the United States has launched a closed configuration and transportation system, but it is difficult to promote due to its complex structure, high cost and cumbersome operation. At the same time, the system can only reduce the risk of leakage by 50-80%. The existing dispenser is equipped with an air bag for balancing air pressure. Some problems were also found during the promotion and application, such as the airbag structure is easy to be damaged / detached, and the channel connecting the airbag is easily blocked by the infiltration of drug solution, so there is still a certain risk of leakage. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the main purpose of the utility model is to provide a puncture-proof air pressure balanced and closed and leak-proof medicine dispensing and transfer component. The structural design is sophisticated and easy to assemble, and can achieve fully closed drug preparation and transfer. During use, the air pressure in the medicine container can be automatically or manually adjusted and balanced to maximize the reduction of the risk of drug leakage. The sealing effect is very excellent, and it has the advantages of low cost and easy use.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions.

[0005] A medicine dispensing and liquid transfer assembly comprises a medicine dispensing pipette and a liquid transfer communicating device, wherein:

[0006] The dispensing pipette comprises a double-chamber injection part, a dispensing needle part and a needle sealing part;

[0007] The double-chamber injection part is composed of a first injection cylinder, a first piston rod that can slide forward and backward along the inner cavity in the first injection cylinder, a second injection cylinder, and a second piston rod that can slide forward and backward along the inner cavity in the second injection cylinder;

[0008] The dispensing needle part is composed of an injection needle seat, a first needle tube and a second needle tube, wherein the first needle tube and the second needle tube are fixedly arranged at the front end of the injection needle seat extending in the front-back direction, and the injection needle seat is used to connect the first needle tube to the first injection cylinder, and connect the second needle tube to the second injection cylinder;

[0009] The needle sealing part is composed of a docking sleeve, a sliding sleeve and a sealing member; wherein the docking sleeve penetrates front and back and is sleeved on the outside of the first needle tube and the second needle tube, and the needle tips of the first needle tube and the second needle tube are located inside the docking sleeve, the rear end of the docking sleeve is connected to the injection needle seat, and a sliding sleeve is arranged outside the sealing member and can be slidably arranged inside the docking sleeve;

[0010] The liquid transfer connector includes a docking seat, a connecting needle and a sealing plug; wherein the connecting needle is fixedly arranged at the front end of the docking seat and is used to connect with a medical container or an interface; an inner cavity is arranged in the docking seat, the inner cavity of the docking seat is open to the rear end, the connecting needle is connected to the inner cavity of the docking seat, and the sealing plug is arranged at the opening at the rear end of the inner cavity of the docking seat;

[0011] The needle sealing part is also provided with a reset structure;

[0012] In the initial state, the sealing member of the dispensing pipette covers the front end openings of the first needle tube and the second needle tube;

[0013] In the connected state, the rear end of the docking seat is inserted into the docking sleeve, and the sealing member is pushed to slide backward, and the needle tips of the first needle tube and the second needle tube pass through the sealing member and the sealing plug in turn and enter the inner cavity of the docking seat;

[0014] During separation, the rear end of the docking seat is pulled out from the docking sleeve, and the reset structure pushes the sealing member to slide forward, so that the sealing member re-wraps the front end openings of the first needle tube and the second needle tube.

[0015] Preferably, the reset structure comprises an elastic arm and a groove, at least two elastic arms are provided and are respectively provided on the front side of the sliding sleeve, each elastic arm applies elastic force radially outward, at least two give-way grooves are provided at the inner front end of the docking sleeve, the give-way grooves correspond to the positions of the elastic arms, and the outer side of the docking seat is provided with a groove, the groove corresponds to the position of the elastic arm;

[0016] When the docking seat is inserted into the docking sleeve, the elastic arm abuts against the clearance groove, and the docking seat passes over the elastic arm and abuts against the front end of the sliding sleeve, and pushes the sealing member to slide backward; during the sliding process, the elastic arm is compressed radially inward and embedded in the groove of the docking seat;

[0017] When the docking seat is pulled out from the docking sleeve, the docking seat pulls the sealing member to slide forward through the groove and the elastic arm until the elastic arm releases the elastic force radially outward at the clearance groove and leaves the groove of the docking seat.

[0018] Preferably, a guide groove is provided on the inner side of the docking sleeve, and the guide groove is parallel to the sliding direction to prevent the sliding sleeve from rotating in the axial direction.

[0019] Preferably, a limiting boss is provided at the inner front end of the docking sleeve to prevent the sliding sleeve from detaching from the docking sleeve.

[0020] Preferably, the reset structure comprises a spring, one end of which abuts against the sealing member, and the other end of which abuts against the inner rear end of the docking sleeve;

[0021] When the docking seat is inserted into the docking sleeve, the docking seat abuts against the front end of the sliding sleeve, pushing the sealing element to slide backward, and the spring is compressed in the axial direction;

[0022] When the docking seat is pulled out from the docking sleeve, the spring releases its elastic force in the axial direction, pushing the sealing member to slide forward, and the sealing member re-wraps the front end openings of the first needle tube and the second needle tube.

[0023] Preferably, a card slot is provided on the inner front portion of the docking sleeve, and a buckle is provided on the outer rear portion of the docking seat, and the buckle and the card slot cooperate with each other so that the needle tips of the first needle tube and the second needle tube pass through the seal and the sealing plug, and the medication pipette is engaged and connected with the pipette connector.

[0024] In the utility model, the front end openings of the first needle tube and the second needle tube are located at the needle tip. As an embodiment, the front end openings are located at the needle tip. As another embodiment, the front end openings are located at the side of the needle tube near the needle tip.

[0025] Preferably, the first needle tube and the second needle tube are fixedly connected to the injection needle seat in a parallel manner.

[0026] Preferably, two independent inner cavities are provided in the docking seat; two connecting needles are provided and are correspondingly connected to the two inner cavities of the docking seat; and the rear end open positions of the two inner cavities of the docking seat correspond to the first needle tube and the second needle tube.

[0027] Preferably, the first needle tube is sleeved outside the second needle tube; the injection needle seat is used to connect the inner cavity of the second needle tube to the second syringe, and to connect the inner cavity between the inner wall of the first needle tube and the outer wall of the second needle tube to the first syringe, and the front end of the second needle tube extends beyond the front end of the first needle tube.

[0028] Preferably, an inner cavity is provided in the docking seat, and the connecting needle is provided with one, and the diameter of the connecting needle is larger than the diameter of the second needle tube.

[0029] Preferably, the liquid transfer connector further comprises a connecting and fixing buckle, and the connecting and fixing buckle is used to snap-fit ​​and fix the liquid transfer connector to the medical container or the medical interface.

[0030] Preferably, the transfer communicating vessel further comprises two holding wings extending backwards and symmetrically arranged.

[0031] Compared with the prior art, the utility model has the following beneficial effects:

[0032] In the utility model, the dispensing pipette is provided with a double-chamber injection part and a dispensing needle part. When dispensing medicine, the dispensing needle part is connected with the medical container or interface through the pipetting connector, and the first syringe can be used to extract or inject the medicine liquid into the medical container or interface through the injection needle seat and the first needle tube, and the second syringe can be used to replenish or discharge the gas from the medical container or interface through the injection needle seat and the second needle tube, so as to balance the air pressure in the container or interface. At the same time, the first needle tube and the second needle tube only pass through the container or interface when dispensing medicine, and are wrapped in the needle sealing part in other conditions, so as to avoid the leakage of the medicine liquid of the dispensing needle. Moreover, in various conditions, the needle tips of the first needle tube and the second needle tube are both located in the docking jacket, so as to avoid punctures caused by the needle tips.

[0033] The utility model is further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic structural diagram of a medication dispensing and liquid transfer assembly according to a first embodiment of the utility model;

[0035] Figure 2 A schematic structural diagram of a medication dispensing and liquid transfer assembly in use according to a first embodiment of the utility model;

[0036] Figure 3 A schematic structural diagram of a medication dispensing and liquid transfer assembly according to a second embodiment of the present utility model;

[0037] Figure 4 A schematic structural diagram of a medication dispensing and liquid transfer assembly according to a third embodiment of the present utility model;

[0038] Figure numerals: 100, dispensing pipette; 10, double-chamber injection part; 11, first syringe; 12, second syringe; 13, first piston rod; 14, second piston rod; 20, dispensing needle part; 21, first needle tube; 22, second needle tube; 23, injection needle seat; 30, needle sealing part; 31, docking sleeve; 311, give way groove; 312, guide groove; 313, limit boss; 32, sliding sleeve; 33, sealing element; 34, elastic arm; 35, spring; 36, slot; 400, pipetting connecting vessel; 41, docking seat; 42, connecting needle; 43, sealing plug; 44, groove; 45, connecting fixing buckle; 46, buckle; 47, holding wing; 500, syringe bottle. DETAILED DESCRIPTION

[0039] In order to better illustrate the purpose, technical solution and advantages of the utility model, the specific implementation of the utility model is further described in detail below in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the utility model, but are not intended to limit the scope of the utility model.

[0040] First embodiment

[0041] like Figure 1 1 is a medicine dispensing and liquid transfer assembly according to the first embodiment of the utility model, which comprises a medicine dispensing and liquid transfer device 100 and a liquid transfer communication device 400 .

[0042] The medication dispensing pipette 100 is composed of a dual-chamber injection part 10 , a medication dispensing needle part 20 , and a needle sealing part 30 .

[0043] Specifically, the dual-chamber injection part 10 is composed of a first injection cylinder 11, a first piston rod 13 that can slide forward and backward along the inner cavity in the first injection cylinder 11, a second injection cylinder 12, and a second piston rod 14 that can slide forward and backward along the inner cavity in the second injection cylinder 12. The first injection cylinder 11 and the second injection cylinder 12 are arranged parallel to each other.

[0044] Specifically, the dispensing needle part 20 is composed of an injection needle seat 23, a first needle tube 21 and a second needle tube 22. The first needle tube 21 and the second needle tube 22 both extend in the front-to-back direction, are axially parallel to each other and are spaced apart by a set distance. The first needle tube 21 and the second needle tube 22 are embedded and fixed to the front end of the injection needle seat 23.

[0045] Specifically, the needle sealing part 30 is composed of a docking sleeve 31, a sliding sleeve 32 and a sealing member 33. The docking sleeve 31 penetrates front and back and is sleeved on the outside of the first needle tube 21 and the second needle tube 22, and the rear end of the docking sleeve 31 is connected to the injection needle seat 23. The needle tips of the first needle tube 21 and the second needle tube 22 are located inside the docking sleeve 31. A sliding sleeve 32 is arranged outside the sealing member 33, and the sealing member 33 slides in the docking sleeve 31 along the front and rear direction through the cooperation between the sliding sleeve 32 and the inner side of the docking sleeve 31. In the initial state, the front end openings of the first needle tube 21 and the second needle tube 22 are respectively wrapped in the sealing member 33.

[0046] The liquid transfer connector 400 is composed of a docking seat 41, two connecting needles 42, and a sealing plug 43. The docking seat 41 is thicker in the middle. The front side of the docking seat 41 is symmetrically provided with a plurality of connecting and fixing buckles 45 along the circumferential direction. The connecting and fixing buckles 45 match and pass through the bottle mouth of the vial 500 and engage the neck of the vial 500. The front side of the docking seat 41 is also symmetrically provided with two gripping wings 47, which extend backward and form a cylindrical shape with an approximate size slightly larger than the vial 500. The rear side of the docking seat 41 of the docking seat 41 extends backward, and two inner cavities are provided therein, and the front end of each inner cavity is open. The sealing plug 43 is provided at the rear end of the docking seat 41 to seal the two inner cavities.

[0047] The dispensing and liquid transfer assembly is also provided with a reset structure. Specifically, two elastic arms 34 are symmetrically arranged on the rear side of the sliding sleeve 32 relative to the axial direction. When no external force is applied, the two elastic arms 34 are radially deflected outward. The inner front end of the docking sleeve 31 is symmetrically provided with two make-way grooves 311, and the outer side of the docking seat 41 is provided with a groove 44, so that when the sliding sleeve 32 is located at a relatively forward position, that is, when the sealing member 33 wraps the position of the front end opening of the first needle tube 21 and the second needle tube 22, the two elastic arms 34 can be correspondingly opened naturally in each make-way groove 311. The end of the elastic arm 34 is provided with a radially inward protrusion, and the outer side of the docking seat 41 is provided with a groove 44. The position of the protrusion and the groove 44 is matched, so that when the sliding sleeve 32 slides backward and the two elastic arms 34 move radially inward, the protrusion of the elastic arm 34 will be embedded in the groove 44 of the docking seat 41.

[0048] The reset structure of this embodiment can realize the function that when the docking seat 41 is inserted into the docking sleeve 31, the elastic arm 34 abuts against the clearance groove 311, and the docking seat 41 can pass over the elastic arm 34 and abut against the rear end of the sliding sleeve 32, and push the sealing member 33 to slide backward. During the sliding process, the elastic arm 34 is compressed radially inward and embedded in the groove 44 of the docking seat 41. When the docking seat 41 is pulled out of the docking sleeve 31, the docking seat 41 pulls the sealing member 33 to slide forward through the groove 44 and the elastic arm 34 until the elastic arm 34 releases the elastic force radially outward at the clearance groove 311 and leaves the groove 44 of the docking seat 41.

[0049] The function of the dispensing and liquid transfer assembly of this embodiment is that, in the connected state, the rear end of the docking seat 41 can be inserted into the front end of the docking jacket 31, and the sealing member 33 is pushed to slide backward, and the needle tips of the first needle tube 21 and the second needle tube 22 pass through the sealing member 33 and the sealing plug 43 in turn, and enter the inner cavity of the docking seat 41. In the non-connected state, the rear end of the docking seat 41 can be pulled out of the docking jacket 31, and the reset structure pushes the sealing member 33 to slide forward, so that the sealing member 33 re-wraps the front end openings of the first needle tube 21 and the second needle tube 22.

[0050] like Figure 2As shown, for ease of understanding, the dispensing process of the dispensing pipetting assembly and the vial 500 of this embodiment includes:

[0051] (1) Hold the holding wing 47 of the pipetting manifold 400, align the rear end of the pipetting manifold 400 with the mouth of the vial 500 and press it in. The connecting buckle 45 will be stuck at the neck of the vial 500, and the two connecting needles 42 will penetrate into the vial 500.

[0052] (2) Hold the syringe barrel of the docking seat 41, align the front end of the docking sleeve 31 with the rear end of the docking seat 41 of the pipetting connector 400, and push the docking sleeve 31 into the docking seat 41. At this time, the sliding sleeve 32 moves backward, the two elastic arms 34 move inward, and the protrusions of the elastic arms 34 will be embedded in the grooves 44 of the docking seat 41.

[0053] (3) Push the first piston rod 13 to move backward, and push the second piston rod 14 to move forward. The liquid medicine in the vial 500 passes through one of the connecting needles 42, the inner cavity of the corresponding docking seat 41, the first needle tube 21 and the injection needle seat 23, and enters the first injection cylinder 11. At the same time, the gas in the second injection cylinder 12 passes through the injection needle seat 23, the second needle tube 22, the inner cavity of another docking seat 41 and the other connecting needle 42, and enters the vial 500.

[0054] (4) The dispensing pipette 100 is pulled out backwards, and the sleeve 32 is still fixed to the docking seat 41 by the elastic arm 34, so that the sleeve 32 moves forward relative to the docking sleeve 31. When the sleeve 32 slides to the clearance groove 311 and opens outward, the sealing member 33 will re-wrap the front end openings of the first needle tube 21 and the second needle tube 22, and at the same time, the docking seat 41 of the pipetting connector 400 is separated from the docking sleeve 31 of the dispensing pipette 100.

[0055] (5) After the preparation of the medicine is completed, the liquid transfer tube 400 and the vial 500 are discarded together.

[0056] It can be seen that the utility model can realize the puncture prevention of the dispensing needle, the leakage prevention of the needle mouth of the dispensing needle, and the air pressure balance during the dispensing process, thereby comprehensively improving the safety of dispensing and liquid transfer.

[0057] Further, to prevent the sliding sleeve 32 from detaching, a limiting boss 313 is provided at the inner front end of the docking sleeve 31. To prevent the sliding sleeve 32 from rotating around the axial direction, a guide groove 312 is provided at the inner side of the docking sleeve 31, and the guide groove 312 is balanced with the sliding direction.

[0058] Second embodiment

[0059] like Figure 3 1 is a medicine dispensing and liquid transfer assembly according to a second embodiment of the present invention, which comprises a medicine dispensing and liquid transfer device 100 and a liquid transfer communication device 400 .

[0060] In particular, in the present embodiment, the first needle tube 21 is sleeved on the outside of the second needle tube 22; the injection needle seat 23 is used to connect the inner cavity of the second needle tube 22 to the second syringe 12, and to connect the inner cavity between the inner wall of the first needle tube 21 and the outer wall of the second needle tube 22 to the first syringe 11, and the front end of the second needle tube 22 extends beyond the front end of the first needle tube 21.

[0061] Particularly, in the present embodiment, an inner cavity is disposed in the docking seat 41 , and a connecting needle 42 is disposed therein, and a diameter of the connecting needle 42 is larger than a diameter of the second needle tube 22 .

[0062] Third embodiment

[0063] like Figure 4 1 is a medicine dispensing and liquid transfer assembly according to a second embodiment of the present invention, which comprises a medicine dispensing and liquid transfer device 100 and a liquid transfer communication device 400 .

[0064] In particular, in this embodiment, the reset structure includes a spring 35. One end of the spring 35 abuts against the seal 33, and the other end of the spring 35 abuts against the inner rear end of the docking sleeve 31. The reset structure of this embodiment can realize the function that when the docking seat 41 is inserted into the docking sleeve 31, the docking seat 41 abuts against the rear end of the sliding sleeve 32, pushing the seal 33 to slide backward, and the spring 35 is compressed in the axial direction; when the docking seat 41 is pulled out of the docking sleeve 31, the spring 35 releases the elastic force in the axial direction, pushing the seal 33 to slide forward, and the seal 33 re-wraps the front end openings of the first needle tube 21 and the second needle tube 22.

[0065] In particular, in the present embodiment, a card slot 36 is provided on the inner front portion of the docking sleeve 31, and a buckle 46 is provided on the outer rear portion of the docking seat 41. The buckle 46 and the card slot 36 cooperate with each other so that the needle tips of the first needle tube 21 and the second needle tube 22 pass through the sealing member 33 and the sealing plug 43, and then the dispensing pipette 100 is engaged and connected with the pipette connector 400.

[0066] The above embodiments mainly describe the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A dispensing pipette assembly, comprising a dispensing pipette (100) and a pipetting connector (400), characterized in that: The dispensing pipette (100) comprises a double-chamber injection part (10), a dispensing needle part (20) and a needle sealing part (30); The double-chamber injection part (10) is composed of a first injection cylinder (11), a first piston rod (13) that can slide forward and backward along the inner cavity of the first injection cylinder (11), a second injection cylinder (12), and a second piston rod (14) that can slide forward and backward along the inner cavity of the second injection cylinder (12); The dispensing needle part (20) is composed of an injection needle seat (23), a first needle tube (21) and a second needle tube (22), wherein the first needle tube (21) and the second needle tube (22) are fixedly arranged at the front end of the injection needle seat (23) in a manner extending in the front-back direction, and the injection needle seat (23) is used to connect the first needle tube (21) to the first injection cylinder (11), and to connect the second needle tube (22) to the second injection cylinder (12); The needle sealing part (30) is composed of a docking sleeve (31), a sliding sleeve (32) and a sealing member (33); wherein the docking sleeve (31) penetrates front and back and is sleeved on the outside of the first needle tube (21) and the second needle tube (22), and the needle tips of the first needle tube (21) and the second needle tube (22) are located inside the docking sleeve (31); the rear end of the docking sleeve (31) is connected to the injection needle seat (23); and the sliding sleeve (32) is arranged outside the sealing member (33) and is slidably arranged inside the docking sleeve (31) in a front-rear manner; The liquid transfer connector (400) comprises a docking seat (41), a connecting needle (42) and a sealing plug (43); wherein the connecting needle (42) is fixedly arranged at the front end of the docking seat (41) and is used to connect with a medical container or an interface; an inner cavity is arranged in the docking seat (41), the inner cavity of the docking seat (41) is open to the rear end, the connecting needle (42) is connected to the inner cavity of the docking seat (41), and the sealing plug (43) is arranged at the opening at the rear end of the inner cavity of the docking seat (41); The needle sealing part (30) is also provided with a reset structure; In the initial state, the sealing member (33) of the dispensing pipette (100) covers the front end openings of the first needle tube (21) and the second needle tube (22); In the connected state, the rear end of the docking seat (41) is inserted into the docking sleeve (31), and the sealing member (33) is pushed to slide backward, and the needle tips of the first needle tube (21) and the second needle tube (22) pass through the sealing member (33) and the sealing plug (43) in sequence and enter the inner cavity of the docking seat (41); During separation, the rear end of the docking seat (41) is pulled out of the docking sleeve (31), and the reset structure pushes the sealing member (33) to slide forward, so that the sealing member (33) re-wraps the front end openings of the first needle tube (21) and the second needle tube (22).

2. The pharmaceutical dispensing and liquid transfer assembly according to claim 1, characterized in that: The reset structure comprises an elastic arm (34) and a groove (44); at least two elastic arms (34) are provided and are respectively arranged on the front side of the sliding sleeve (32); each elastic arm (34) applies elastic force radially outward; at least two paving grooves (311) are provided at the inner front end of the docking sleeve (31); the paving grooves (311) correspond to the positions of the elastic arms (34); and a groove (44) is provided on the outer side of the docking seat (41); the groove (44) corresponds to the position of the elastic arm (34); When the docking seat (41) is inserted into the docking sleeve (31), the elastic arm (34) abuts against the clearance groove (311), the docking seat (41) passes over the elastic arm (34) and abuts against the front end of the sliding sleeve (32), and pushes the sealing member (33) to slide backward; during the sliding process, the elastic arm (34) is compressed radially inward and embedded in the groove (44) of the docking seat (41); When the docking seat (41) is pulled out of the docking sleeve (31), the docking seat (41) slides forward by pulling the sealing member (33) through the groove (44) and the elastic arm (34) until the elastic arm (34) releases its elastic force radially outward at the clearance groove (311) and leaves the groove (44) of the docking seat (41).

3. The pharmaceutical dispensing and liquid transfer assembly according to claim 2, characterized in that: A guide groove (312) is provided on the inner side of the docking sleeve (31), and the guide groove (312) is parallel to the sliding direction to prevent the sliding sleeve (32) from rotating in the axial direction.

4. The pharmaceutical dispensing and liquid transfer assembly according to claim 2, characterized in that: A limiting boss (313) is provided at the inner front end of the docking sleeve (31) to prevent the sliding sleeve (32) from being separated from the docking sleeve (31).

5. The pharmaceutical dispensing and liquid transfer assembly according to claim 1, characterized in that: The reset structure comprises a spring (35), one end of the spring (35) abuts against the sealing member (33), and the other end of the spring (35) abuts against the inner rear end of the docking sleeve (31); When the docking seat (41) is inserted into the docking sleeve (31), the docking seat (41) abuts against the front end of the sliding sleeve (32), pushing the sealing member (33) to slide backward, and the spring (35) is compressed in the axial direction; When the docking seat (41) is pulled out of the docking sleeve (31), the spring (35) releases its elastic force in the axial direction, pushing the sealing member (33) to slide forward, and the sealing member (33) re-wraps the front end openings of the first needle tube (21) and the second needle tube (22).

6. The pharmaceutical dispensing and liquid transfer assembly according to claim 5, characterized in that: The inner front portion of the docking sleeve (31) is provided with a slot (36), and the outer rear portion of the docking seat (41) is provided with a buckle (46), and the buckle (46) and the slot (36) cooperate with each other so that the needle tips of the first needle tube (21) and the second needle tube (22) pass through the sealing member (33) and the sealing plug (43), and then the dispensing pipette (100) is engaged and connected with the pipetting connector (400).

7. The pharmaceutical dispensing and liquid transfer assembly according to claim 1, characterized in that: The first needle tube (21) and the second needle tube (22) are fixedly connected to the injection needle seat (23) in a mutually parallel manner.

8. The pharmaceutical dispensing and liquid transfer assembly according to claim 7, characterized in that: The docking seat (41) is provided with two inner cavities independent of each other; the connecting needles (42) are provided with two and are correspondingly connected to the two inner cavities of the docking seat (41); the rear end open positions of the two inner cavities of the docking seat (41) correspond to the first needle tube (21) and the second needle tube (22).

9. The pharmaceutical dispensing and liquid transfer assembly according to claim 1, characterized in that: The first needle tube (21) is sleeved outside the second needle tube (22); the injection needle seat (23) is used to connect the inner cavity of the second needle tube (22) to the second injection cylinder (12), and to connect the inner cavity between the inner wall of the first needle tube (21) and the outer wall of the second needle tube (22) to the first injection cylinder (11), and the front end of the second needle tube (22) extends outside the front end of the first needle tube (21).

10. The pharmaceutical dispensing and liquid transfer assembly according to claim 9, characterized in that: An inner cavity is provided inside the docking seat (41), and the connecting needle (42) is provided with a tube diameter of the connecting needle (42) being larger than the tube diameter of the second needle tube (22).

11. The pharmaceutical dispensing and liquid transfer assembly according to claim 1, characterized in that: The liquid transfer communication device (400) further comprises a connection fixing buckle (45), and the connection fixing buckle (45) is used to snap-fit ​​and fix the liquid transfer communication device (400) to a medical container or a medical interface.

12. The pharmaceutical dispensing and liquid transfer assembly according to claim 1, characterized in that: The liquid transfer connecting vessel (400) further comprises two holding wings (47) extending backwards and arranged symmetrically.

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