CN221981184U - A variable-mode air pressure balanced liquid medicine transfer device - Google Patents

Abstract

The utility model discloses a variable-mode gas pressure balanced liquid medicine transfer device, which relates to the field of medical dispensing liquid transfer devices. The utility model is provided with a first needle tube for conducting liquid and a second needle tube for conducting gas in the dispensing needle, and a pass-stop module is also provided; when the pass-stop module controls the dispensing needle assembly to operate in the first mode, the dispensing syringe injects and extracts the medicine through the liquid channel, and the gas channel is used to exhaust air when the medicine is injected into the syringe bottle, and to provide air when it is extracted, so as to achieve gas pressure balance; when the pass-stop module controls the dispensing needle assembly to operate in the second mode, the dispensing syringe injects the infusion pump through the first needle tube as the liquid channel, and the second needle tube as the gas channel is blocked, and the medicine will not flow to the gas pressure balance part through the gas channel.

Description

Mode-variable air pressure balance liquid medicine transfer device

Technical Field

The utility model relates to the field of medical dispensing pipetting devices, in particular to a mode-variable air pressure balanced liquid medicine transfer device.

Background

Dangerous drugs represented by chemotherapy drugs have great harm to the health of medical staff who are engaged in the preparation and transportation of the drugs for a long time, such as cancer, internal organ injury, DNA injury, reproductive problems, abortion teratogenesis and the like. The existing data show that the incidence rate of cancers of pharmacists, nurses and other personnel in long-term contact with dangerous drugs is increased by 3-10 times compared with the common population, and the risks of sterility, abortion and the like are increased by 2-5 times. Therefore, some medical institutions build various facilities such as purifying rooms and biological cabinets to reduce the risk of drug leakage, and the investment is large but the actual popularization and application effects are poor.

Chinese patent publication No. CN115102444B discloses a double-chamber circulation closed type liquid medicine transfer device and liquid medicine transfer system. The dispensing device is provided with a dispensing injector, wherein one chamber is used for infusing liquid, and the other chamber is used for balancing air pressure, so that the high-pressure condition in the dispensing process is effectively reduced, and the leakage risk is reduced.

However, such dispensing devices may require access to an infusion pump or the like to administer the metered pump drug after the drug is dispensed. In this case, the high pressure will act against the gas needle, not only does the infusion pump fail, but the drug will also flow directly to the gas channel.

Disclosure of utility model

In view of the above, an object of the present utility model is to provide a pressure-balanced drug solution transfer device of variable mode, which can achieve accurate pressure balance in a drug vial and a drug dispensing device, and in which drug solution does not flow into a gas passage when a high-pressure infusion pump is used.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

A variable mode, air pressure balanced medical fluid transfer device comprising: a dispensing syringe, a dispensing needle assembly and an air pressure balancing part,

The dispensing needle assembly comprises a needle seat, a first needle tube and a second needle tube;

The rear end of the needle seat is fixedly connected to the front end of the dispensing syringe and communicated with the inner cavity of the dispensing syringe, the first needle tube is fixedly connected to the front end of the needle seat, and the second needle tube is fixedly connected to the front end of the needle seat in the same extending direction as the first needle tube;

The air pressure balancing part is fixedly connected to the side surface of the needle seat and is used for providing air for balancing air pressure;

the inside of the needle seat is provided with a first channel and a second channel, the front end of the first channel is communicated with the rear end of the first needle tube, the rear end of the first channel is communicated with the inner cavity of the dispensing syringe, the front end of the second channel is communicated with the rear end of the second needle tube, and the rear end of the second channel is communicated with the air pressure balancing part;

a through-stop module for controlling the second channel to be communicated or cut off is arranged in the second channel of the needle seat.

Optionally, the stop module is a stop valve provided with a through hole, and the stop valve is a needle seat and penetrates through a valve groove of the second channel in the radial direction; the through-stop valve is rotatably arranged in the valve groove, and the through hole is aligned or misplaced with the second channels through rotation, so that the second channels on two sides are communicated or cut off.

Optionally, the valve groove is internally provided with an arc groove, the outer side wall of the through-stop valve is provided with a limiting protrusion, and the limiting protrusion is slidably arranged in the arc groove, so that the through-stop valve rotates in the arc groove.

Optionally, the stop module is a stop valve provided with a through hole, and the stop valve is a needle seat and penetrates through a valve groove of the second channel in the radial direction; the through-stop valve is arranged in the valve groove in a vertical sliding manner, and the through hole and the second channels are aligned or misplaced through vertical sliding, so that the second channels on two sides are communicated or cut off.

Optionally, the air pressure balancing part is an additional injector, and the additional injector is composed of a second injection cylinder and a second piston rod which can slide back and forth along the inner cavity in the second injection cylinder; the dispensing injector consists of a first injection cylinder and a first piston rod which can slide back and forth along an inner cavity in the first injection cylinder; the first injection cylinder and the second injection cylinder are arranged side by side in the same direction, and the rear end of the second channel of the needle seat is communicated with the front end joint of the second injection cylinder.

Optionally, the air pressure balancing part is an air bag, an opening is arranged at the rear end of the second channel, the air bag is sleeved on the outer side of the needle seat and seals the opening, and the air bag is internally provided with non-filled air.

Optionally, the air pressure balancing part is a waterproof and breathable film, a louver is arranged at the rear end of the second channel, the waterproof and breathable film is arranged on the louver, and the second channel is communicated with the outside atmosphere through the waterproof and breathable film.

Optionally, the needle head sealing assembly comprises a sliding sleeve and a sealing piece, wherein the rear end of the sliding sleeve is axially and slidably arranged on the outer side wall of the needle seat, and the sealing piece is fixedly arranged at the front end of the sliding sleeve; the needle head sealing assembly is arranged on the dispensing needle assembly, so that the sealing piece tightly wraps the front end parts of the first needle tube and the second needle tube when the sliding sleeve slides to the front part relative to the needle seat, and the front end parts of the first needle tube and the second needle tube penetrate out of the sealing piece when the sliding sleeve slides to the rear part relative to the needle seat.

Optionally, the first needle tube and the second needle tube are arranged in a same direction, a liquid channel is arranged in the first needle tube, and the rear end of the first needle tube is arranged on the needle seat and is communicated with the front end of the first channel; the second needle tube is internally provided with a gas channel, and the rear end of the second needle tube is arranged on the needle seat and is communicated with the front end of the second channel.

Optionally, the outside of second needle tubing is located to first needle tubing cover, the front end of second needle tubing is equipped with the needle point and wears out outside the first needle tubing, the rear end of second needle tubing communicates the front end of second passageway, the rear end of first needle tubing communicates the front end of first passageway, the cavity between the inner wall of first needle tubing and the outer wall of second needle tubing is the liquid channel, the inside cavity of second needle tubing is the gas channel.

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

The utility model sets a first needle tube for conducting liquid and a second needle tube for conducting gas on the dispensing needle, and also sets a stop module; when the stopping module controls the dispensing needle assembly to operate in the first mode, the dispensing injector is used for injecting and extracting medicines through the liquid channel, the gas channel is used for discharging air when the medicines are injected into the penicillin bottle, and air is provided during extraction, so that air pressure balance is achieved.

Drawings

Fig. 1 is a schematic cross-sectional view of a medical fluid transfer device according to a first embodiment of the present utility model.

FIG. 2 is a schematic cross-sectional view of a medical fluid transfer device according to a second embodiment of the present utility model;

Fig. 3 is a schematic sectional view showing a state of use of the drug solution shifter according to the second embodiment of the present utility model.

Fig. 4a is one of representative physical diagrams of a medical fluid transfer device according to an embodiment of the present utility model.

FIG. 4b is a second representative physical diagram of a medical fluid transfer device according to an embodiment of the present utility model.

FIG. 4c is a third representative physical view of a medical fluid transfer device according to an embodiment of the present utility model.

Fig. 5 is a schematic cross-sectional view of a drug solution shifter according to a third embodiment of the present utility model.

Fig. 6 is a schematic cross-sectional view of a drug solution shifter according to a fourth embodiment of the present utility model.

Reference numerals: 10. a dispensing syringe; 11. a first syringe; 12. a first piston rod; 20. a dispensing needle assembly; 21. a needle stand; 211. a first channel; 212. a second channel; 22. a first needle tube; 23. a second needle tube; 30. a needle sealing assembly; 31. a sliding sleeve; 32. a sealing member; 40. a stop valve; 41. an arc groove; 42. a limit protrusion; 51. a second syringe; 52. a second piston rod; 61. an air bag; 62. an opening; 71. a louver; 72. a waterproof breathable film; 80. a chemotherapy pump.

Detailed Description

For a better illustration of the objects, technical solutions and advantages of the present utility model, the following detailed description of the present utility model will be given with reference to the accompanying drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

First embodiment

As shown in fig. 1, a pneumatic balanced medical fluid transfer device according to a first embodiment of the present utility model is provided. The medical fluid transfer device comprises a dispensing syringe 10, a dispensing needle assembly 20, an additional syringe and a stop-and-go module. Wherein the additional syringe acts as a balance part for the platen.

Specifically, the dispensing syringe 10 is constituted by a first syringe barrel 11, and a first piston rod 12 slidable back and forth along an inner cavity within the first syringe barrel 11; the additional syringe is composed of a second syringe 51, a second piston rod 52 slidable back and forth along the inner cavity of the second syringe 51, and the first syringe 11 and the second syringe 51 are arranged side by side in the same direction, and the rear end of the second channel 212 of the needle holder 21 is connected to the front end joint of the second syringe 51.

Specifically, the dispensing needle assembly 20 includes a first needle cannula 22, a second needle cannula 23, and a needle hub 21. A first channel 211 and a second channel 212 are provided in the needle holder 21. The first needle tube 22 and the second needle tube 23 are arranged in the same direction, a liquid channel is arranged in the first needle tube 22, a needle point and a liquid opening 62 are arranged at the front end of the first needle tube 22, and the rear end of the first needle tube 22 is arranged on the needle seat 21 and is communicated with the front end of the first channel 211; the second needle tube 23 is internally provided with a gas channel, the front end of the second needle tube 23 is provided with a needle point and a gas opening 62, the rear end of the second needle tube 23 is arranged on the needle seat 21 and is communicated with the front end of the second channel 212, and the rear end of the second channel 212 is communicated with the second injection tube 51.

When the medicine bottle is at high air pressure in use, the second piston rod 52 of the additional injector slides forwards, and air is supplemented into the medicine bottle through the second channel 212 and the air channel, so that the high air pressure in the medicine bottle is relieved; when the negative air pressure is applied to the medicine bottle, the second piston rod 52 of the additional syringe slides backward, and the air in the bottle enters the second syringe 51 through the air passage and the second passage 212, so that the negative air pressure in the medicine bottle is released.

Specifically, the stop module is a stop valve 40 provided with a through hole, and the needle seat 21 passes through the valve groove of the second channel 212 from the radial direction; the check valve 40 is rotatably disposed in the valve spool, and rotates to align or misalign the through hole with the second passage 212, thereby allowing the second passages 212 on both sides to be penetrated or blocked.

During dispensing, the stop valve 40 is slid to a predetermined position such that both ends of the through hole extend through the second passage 212. Pushing the first piston rod 12 to withdraw or infuse the medical fluid and pushing the second piston rod 52 to balance the air pressure.

After the dispensing is completed, the stop valve 40 slides to another preset position, causing the stop valve 40 to block the second passage 212. At this time, the second needle tube 23 is also blocked from the second syringe 51. The drug solution transfer device may be applied to the chemotherapy pump 80. Pushing the first piston rod 12, the configured medical fluid of the first syringe 11 will be injected into the capsule of the chemotherapy pump 80, whereas the high pressure in the capsule cannot reach the second syringe 51 through the second channel 212.

Specifically, in the first embodiment, the valve groove is provided in the circular arc groove 41, and the outer side wall of the through-stop valve 40 is provided with the stopper projection 42, and the stopper projection 42 is slidably provided in the circular arc groove 41 to rotate the through-stop valve 40 in the circular arc groove 41.

It will be appreciated that in other embodiments according to the utility model, the stop module is a stop valve 40 provided with a through hole, a needle seat 21 and a valve groove passing radially through the second passage 212; the check valve 40 is provided in the valve spool so as to slide up and down, and the through hole is aligned with or offset from the second passage 212 by the up and down sliding, so that the second passages 212 on both sides are penetrated or blocked.

Specifically, in the first embodiment, the first needle cannula 22 and the second needle cannula 23 extend in the front-rear direction, the first needle cannula 22 is sleeved outside the second needle cannula 23, and the rear ends of the first needle cannula 22 and the second needle cannula 23 are respectively fixed at the front end of the injection needle holder 21. The rear end of the injection needle holder 21 is fixed to the front end of the dispensing syringe 1010, and by means of the arrangement of the internal passage of the injection needle holder 21, the rear end of the inner cavity between the inner wall of the first needle tube 22 and the outer wall of the second needle tube 23 is communicated to the first syringe 11 on the one hand, and the rear end of the inner cavity of the second needle tube 23 is also communicated to the second syringe 51 on the other hand. The inner cavities of the inner wall of the first needle tube 22 and the outer wall of the second needle tube 23 are liquid channels, and the inner cavity of the second needle tube 23 is a gas channel.

Second embodiment

As shown in fig. 2 and 3, the medical fluid transfer device according to the second embodiment of the present utility model includes a dispensing syringe 10, a dispensing needle assembly 20, an additional syringe, a stopper module, and a needle sealing assembly 30.

Needle closure assembly 30 includes a sliding sleeve 31 and a closure 32. The slide bush 31 has a penetrating structure in the front-rear direction. The closing member 32 is made of an elastic material and is fixed to the front end of the sliding sleeve 31. The rear end of the slide sleeve 31 is axially slidably provided on the outer side wall of the injection needle holder 21. Primary needle seal assembly 30 includes a sliding sleeve 31 and a seal 32. The slide bush 31 has a penetrating structure in the front-rear direction. The closing member 32 is made of an elastic material and is fixed to the front end of the sliding sleeve 31. The rear end of the slide sleeve 31 is axially slidably provided on the outer side wall of the injection needle holder 21. In the initial state, the sliding sleeve 31 is positioned at the front side of the injection needle holder 21, and the sealing member tightly wraps the front end openings 62 of the first needle tube 22 and the second needle tube 23. When dispensing begins, the front end of the drug solution transfer device is aligned and pressure is applied toward the drug vial opening 62, and the slide sleeve 31 slides rearward relative to the needle hub 21, causing the front end openings 62 of the first needle cannula 22 and the second needle cannula 23 to pierce the closure 32 and penetrate into the interior of the drug vial. When dispensing is completed, the drug solution transfer device is pulled out backward relative to the drug vial, and the sliding sleeve 31 slides forward relative to the injection needle seat 21 (under the action of manual or spring force), so that the sealing member 32 re-wraps the front end openings 62 of the first needle tube 22 and the second needle tube 23, thereby avoiding the drug leakage of the dispensing needle assembly 20 in the dispensing process.

It follows that the second embodiment provides for leak protection of the dispensing needle assembly 20 during dispensing as compared to the first embodiment.

Referring to fig. 3, in the medical fluid transfer apparatus according to the second embodiment, after the completion of the dispensing, the check valve 40 is slid to another predetermined position, so that the second passage 212 is blocked by the check valve 40. At this time, the second needle tube 23 is also blocked from the second syringe 51. The drug solution transfer device may be applied to the chemotherapy pump 80. Pushing the first piston rod 12, the configured medical fluid of the first syringe 11 will be injected into the capsule of the chemotherapy pump 80, whereas the high pressure in the capsule cannot reach the second syringe 51 through the second channel 212.

Fig. 4a to 4c are representative physical views of the drug solution transferor. Fig. 4a is a sample physical diagram of the front view angle of the stop module in the assembled state, fig. 4b is a sample physical diagram of the stop module in the split state, and fig. 4c is a sample physical diagram of the whole liquid medicine transfer device.

Third embodiment

As shown in fig. 5, a pneumatic balanced medical fluid transfer device according to a third embodiment of the present utility model is provided. The medical fluid transfer device of the present embodiment includes a dispensing syringe 10, a dispensing needle assembly 20, an additional syringe, and a balloon 61. Wherein, unlike the first embodiment, in the present embodiment, the air bag 61 serves as a flat pressure balance portion.

Specifically, the rear end of the second channel 212 is provided with an opening 62, the air bag 61 is sleeved outside the needle seat 21 and seals the air window 71, and the air bag 61 is provided with an unfilled air.

Meanwhile, in the present embodiment, the through-stop module is formed by a through-stop valve 40 provided with a through hole, a needle seat 21, and a valve groove passing through the second passage 212 in the radial direction; the check valve 40 is rotatably disposed in the valve spool, and rotates to align or misalign the through hole with the second passage 212, thereby allowing the second passages 212 on both sides to be penetrated or blocked.

When the stop valve 40 is slid to the preset position, both ends of the through hole are abutted against the second channel 212, so that the dispensing needle assembly 20 is adjusted to the first mode, that is, the second needle tube 23 is communicated with the air bag 61 through the second channel 212. At this time, the first piston rod 12 is pushed or pulled, the liquid medicine is injected or extracted from the first syringe 11, and the air pressure of the injected or extracted liquid medicine is balanced with the air bag 61 through the second passage 212.

When the stop valve 40 moves beyond the preset position, the outer side of the stop valve 40 blocks the second passage 212 to adjust the needle assembly 20 to the second mode. At this time, the medical fluid transfer device may be applied to the chemotherapy pump 80. Pushing the first piston rod 12, the dispensed medical fluid of the first syringe 11 will be injected into the balloon of the chemotherapy pump 80, whereas the high pressure in the balloon cannot reach the balloon 61 through the second channel 212.

In the present embodiment, the first needle cannula 22 and the second needle cannula 23 extend in the front-rear direction and are arranged in parallel to each other at a predetermined distance, and are fixed at the front end of the injection needle holder 21 at the rear ends thereof, respectively, as compared with the first embodiment. The first needle tube (22) is internally provided with a liquid channel, and the second needle tube (23) is internally provided with a gas channel. In use, the first needle cannula 22 and the second needle cannula 23 may be used to simultaneously perform a piercing and dispensing operation.

Fourth embodiment

As shown in fig. 6, a pneumatic balanced medical fluid transfer device according to a fourth embodiment of the present utility model is provided. The medicine liquid transferor of this embodiment includes a dispensing syringe 10, a dispensing needle assembly 20, an additional syringe and a waterproof and breathable membrane 72, and a louver 71 is provided at the rear end of the second channel 212, and the waterproof and breathable membrane 72 is provided on the louver 71, and the second channel 212 is communicated with the outside atmosphere through the waterproof and breathable membrane 72.

Meanwhile, in the present embodiment, the on-off module is constituted by the on-off valve 40. Meanwhile, the needle holder 21 is provided with a valve groove penetrating the needle holder 21 and passing through the second passage 212 in a radial direction, and the check valve 40 is slidably disposed in the valve groove up and down, and the check valve 40 is provided with a through hole to communicate with the second passage 212.

When the stop valve 40 slides to a preset position, both ends of the through hole are abutted to the second channel 212, so that the dispensing needle assembly 20 is adjusted to the first mode, that is, the second needle tube 23 is communicated with the external atmosphere through the second channel 212 and the waterproof and breathable membrane 72. At this time, the first piston rod 12 is pushed or pulled to inject or extract the liquid medicine into or from the first syringe 11, and the air pressure of the injected or extracted liquid medicine is balanced with the external atmosphere through the second passage 212 and the waterproof and breathable membrane 72.

When the stop valve 40 moves beyond the preset position, the outer side of the stop valve 40 blocks the second passage 212 to adjust the needle assembly 20 to the second mode. At this time, the medical fluid transfer device may be applied to the chemotherapy pump 80. Pushing the first piston rod 12, the disposed medical fluid of the first syringe 11 is injected into the capsule of the chemotherapy pump 80, and the high pressure in the capsule cannot leak to the outside through the second passage 212 and the waterproof and breathable membrane 72.

In the present embodiment, the first needle cannula 22 and the second needle cannula 23 extend in the front-rear direction and are arranged in parallel to each other at a predetermined distance, and are fixed at the front end of the injection needle holder 21 at the rear ends thereof, respectively, as compared with the first embodiment. In use, the first needle cannula 22 and the second needle cannula 23 may be used to simultaneously perform a piercing and dispensing operation.

Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" and "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

The foregoing embodiments have described primarily the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims.

Claims (10)

1. A variable mode, air pressure balanced medical fluid transfer device comprising: a dispensing syringe (10), a dispensing needle assembly (20) and a pneumatic balance part,

The dispensing needle assembly (20) comprises a needle seat (21), a first needle tube (22) and a second needle tube (23);

The rear end of the needle seat (21) is fixedly connected to the front end of the dispensing syringe (10) and communicated with the inner cavity of the dispensing syringe (10), the first needle tube (22) is fixedly connected to the front end of the needle seat (21), and the second needle tube (23) is fixedly connected to the front end of the needle seat (21) in the same extending direction as the first needle tube (22);

The air pressure balancing part is fixedly connected to the side surface of the needle seat (21) and is used for providing air for balancing air pressure;

A first channel (211) and a second channel (212) are arranged in the needle seat (21), the front end of the first channel (211) is communicated with the rear end of the first needle tube (22), the rear end of the first channel (211) is communicated with the inner cavity of the dispensing syringe (10), the front end of the second channel (212) is communicated with the rear end of the second needle tube (23), and the rear end of the second channel (212) is communicated with the air pressure balancing part;

A through-stop module for controlling the through or the separation of the second channel (212) is arranged in the second channel (212) of the needle seat (21).

2. The medical fluid transfer device according to claim 1, wherein the stop module is a stop valve (40) provided with a through hole, a needle seat (21) and a valve slot passing radially through the second channel (212); the through-stop valve (40) is rotatably arranged in the valve groove, and the through hole and the second channels (212) are aligned or misplaced through rotation, so that the through-holes and the second channels (212) on two sides are communicated or separated.

3. The medical fluid transfer device according to claim 2, wherein the valve groove is provided in an arc groove (41), an outer side wall of the through-stop valve (40) is provided with a limit protrusion (42), and the limit protrusion (42) is slidably provided in the arc groove (41) to rotate the through-stop valve (40) in the arc groove (41).

4. The medical fluid transfer device according to claim 1, wherein the stop module is a stop valve (40) provided with a through hole, a needle seat (21) and a valve slot passing radially through the second channel (212); the through-stop valve (40) is arranged in the valve groove in a vertical sliding manner, and the through hole is aligned or misplaced with the second channels (212) through vertical sliding, so that the through or separation of the second channels (212) at two sides is realized.

5. The medical fluid transfer device according to claim 1, wherein the air pressure balancing part is an additional syringe, the additional syringe is composed of a second syringe (51), and a second piston rod (52) which can slide back and forth along the inner cavity in the second syringe (51); the dispensing injector (10) is composed of a first injection cylinder (11) and a first piston rod (12) which can slide back and forth along the inner cavity in the first injection cylinder (11); the first injection cylinder (11) and the second injection cylinder (51) are arranged side by side in the same direction, and the rear end of the second channel (212) of the needle seat (21) is communicated with the front end joint of the second injection cylinder (51).

6. The medical fluid transfer device according to claim 1, wherein the air pressure balancing portion is an air bag (61), an opening (62) is provided at the rear end of the second channel (212), the air bag (61) is sleeved on the outer side of the needle seat (21) and closes the opening (62), and the air bag (61) is provided with non-filled air.

7. The liquid medicine transfer device according to claim 1, wherein the air pressure balancing portion is a waterproof and breathable film (72), a louver (71) is provided at a rear end of the second channel (212), the waterproof and breathable film (72) is provided on the louver (71), and the second channel (212) is communicated with the outside atmosphere through the waterproof and breathable film (72).

8. The liquid medicine transfer device according to claim 1, further comprising a needle sealing assembly (30), wherein the needle sealing assembly (30) comprises a sliding sleeve (31) and a sealing member (32), the rear end of the sliding sleeve (31) is axially slidably arranged on the outer side wall of the needle seat (21), and the sealing member (32) is fixedly arranged on the front end of the sliding sleeve (31); the needle head sealing assembly (30) is arranged on the dispensing needle assembly (20) so that the sealing piece (32) tightly wraps the front end parts of the first needle tube (22) and the second needle tube (23) when the sliding sleeve (31) slides to the front part relative to the needle seat (21), and the front end parts of the first needle tube (22) and the second needle tube (23) penetrate out of the sealing piece (32) when the sliding sleeve (31) slides to the rear part relative to the needle seat (21).

9. The liquid medicine transfer device according to claim 1, wherein the first needle tube (22) and the second needle tube (23) are arranged in a same direction, a liquid channel is arranged in the first needle tube (22), and the rear end of the first needle tube (22) is arranged on the needle seat (21) and is communicated with the front end of the first channel (211); the second needle tube (23) is internally provided with a gas channel, and the rear end of the second needle tube (23) is arranged on the needle seat (21) and is communicated with the front end of the second channel (212).

10. The liquid medicine transfer device according to claim 1, wherein the first needle tube (22) is sleeved outside the second needle tube (23), the front end of the second needle tube (23) is provided with a needle point and penetrates out of the first needle tube (22), the rear end of the second needle tube (23) is communicated with the front end of the second channel (212), the rear end of the first needle tube (22) is communicated with the front end of the first channel (211), a cavity between the inner wall of the first needle tube (22) and the outer wall of the second needle tube (23) is a liquid channel, and a cavity inside the second needle tube (23) is a gas channel.