CN221712856U - A special syringe for dispensing medicine - Google Patents

Abstract

The utility model relates to a special syringe for dispensing medicines, comprising a syringe barrel 1, a piston 2, and an injection needle 3. The injection needle 3 comprises a needle tip 4, a needle stem 5, and a needle plug 6. The utility model is characterized in that an air inlet channel 7 and a liquid inlet channel 8 are arranged inside the injection needle 3, and the air inlet channel 7 and the liquid inlet channel 8 are separated from each other. The beneficial effect of the utility model is that the medicine liquid can be sucked in one step to reduce repeated puncture of the bottle stopper, reduce the possibility of contamination of the injection needle, avoid waste of the medicine liquid, and reduce the risk of exposure of medical staff.

Description

A special syringe for dispensing medicine

Technical Field

The utility model relates to the field of medical instruments, in particular to a special syringe for dispensing medicines.

Background Art

A syringe is a common medical device that mainly uses a needle to extract or inject gas or liquid. A syringe is mainly composed of a syringe barrel, a piston, and an injection needle. The syringe barrel is a hollow cylindrical container for holding liquid medicine. The injection needle is a slender metal tube used to draw liquid medicine. The principle of syringe drawing liquid medicine is that the piston moves in the syringe barrel so that the liquid medicine is sucked into the syringe. Specifically, when the piston moves upward, the pressure in the syringe barrel decreases, and the liquid medicine is sucked into the syringe. When the piston moves downward, the pressure in the syringe barrel increases, and the liquid medicine is pushed out of the syringe needle. There are negative pressure, positive pressure and isobaric pressure in the medicine bottle. The negative pressure in the medicine bottle is the rarefaction of the pressure in the bottle below the existing atmospheric pressure. The pressure in the medicine bottle is negative pressure, which is more common in tumor drugs. The purpose of maintaining negative pressure is to ensure the purity and effectiveness of the drug, prevent air and microorganisms from entering the bottle, thereby protecting the quality and efficacy of the drug, and there is no possibility of drug particles overflowing from the injection site when injecting the solvent. It can be seen that the solvent can easily enter the bottle from the syringe, but it is difficult to extract the liquid medicine. In clinical practice, due to the negative pressure in the bottle, medical staff need to pull out the syringe needle and then suck out an equal amount of air to pierce the needle into the bottle to reduce the negative pressure in the bottle before they can continue to suck the liquid medicine out of the bottle. It can be seen that this method is prone to contamination of the injection needle; repeated suction will put medical staff at risk of being stabbed, and the needle plug and the syringe nipple will easily fall off, leading to various adverse events and wasting manpower and material resources; when too much air is injected into the bottle, the liquid medicine will overflow from the needle eye, which will not only cause drug waste, but also cause environmental pollution.

Utility Model Content

The utility model provides a special syringe for dispensing medicines, comprising a syringe barrel, a piston and an injection needle. The injection needle comprises a needle tip, a needle stem and a needle plug. The utility model is characterized in that an air inlet channel and a liquid inlet channel are arranged inside the injection needle, and the air inlet channel and the liquid inlet channel are separated from each other.

As an improvement, an air inlet hole is provided on the pintle, and the air inlet hole is communicated with the air inlet channel.

As a further improvement, an air outlet hole is provided on the needle stem on the same side as the air inlet hole and connected to the needle tip, and the air outlet hole is communicated with the air inlet channel.

As a further improvement, a film is provided at the air inlet, and the film is made of expanded polytetrafluoroethylene material.

As a further improvement, a valve is further included, and the valve is detachably connected to the air inlet.

As a further improvement, the diameter of the air inlet hole is 0.5 mm-1 mm, and preferably, the diameter of the air inlet hole is 0.7 mm.

As a further improvement, the diameter of the air outlet hole is 0.4 mm-0.6 mm, and preferably, the diameter of the air outlet hole is 0.5 mm.

As a further improvement, a liquid inlet hole is also provided on the needle stem, and the liquid inlet hole is connected to the liquid inlet channel.

As a further improvement, the distance between the liquid inlet hole and the tip of the needle tip is 5 mm-7 mm. Preferably, the distance between the liquid inlet hole and the tip of the needle tip is 6 mm.

As a further improvement, the liquid inlet hole is an elliptical hole, and the specification of the liquid inlet hole is 2.5-3.5mm*0.5-1.5mm. Preferably, the specification of the liquid inlet hole is 3.0mm*1.0mm.

The above technical scheme of the utility model has the following beneficial effects: when preparing liquid, it avoids the need for repeated suction due to the negative pressure state in the bottle, and the drug solution can be sucked in one step, thereby reducing repeated puncture of the bottle stopper, reducing the possibility of contamination of the injection needle, avoiding waste of drug solution and reducing the risk of exposure of medical staff.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is an overall schematic diagram of a special syringe for dispensing medicines according to the present invention;

FIG2 is a schematic diagram of the side structure of an injection needle of some specific embodiments of a special syringe for dispensing medicine according to the utility model;

FIG3 is a schematic diagram of the structure of an injection needle of some specific embodiments of a special syringe for dispensing medicine according to the utility model;

Description of reference numerals: 1. syringe 2. piston 3. injection needle 4. needle tip 5. needle stem 6. needle plug 7. air inlet channel 8. liquid inlet channel 9. air inlet hole 10. air outlet hole 11. film 12. valve 13. liquid inlet hole.

DETAILED DESCRIPTION

The following examples further illustrate the content of the utility model, but should not be construed as limiting the utility model. Without departing from the spirit and essence of the utility model, modifications or replacements made to the methods, steps or conditions of the utility model are within the scope of the utility model.

The implementation modes of the present utility model are described in detail below with reference to the accompanying drawings and embodiments.

As shown in Figures 1 and 2, the utility model is a special syringe for dispensing medicine, including a syringe barrel 1, a piston 2, and an injection needle 3. The injection needle 3 includes a needle tip 4, a needle stem 5, and a needle plug 6. An air inlet channel 7 and a liquid inlet channel 8 are provided inside the injection needle 3, and the air inlet channel 7 and the liquid inlet channel 8 are separated from each other.

As shown in FIG1 , the syringe barrel 1, the piston 2, and the injection needle 3 are connected in sequence to form a whole. As shown in FIG2 , the injection needle 3 is divided into two channels at the dotted line. The air inlet channel 7 is established on the opposite side of the liquid inlet channel 8. The air inlet channel 7 and the liquid inlet channel 8 are separated from each other. In FIG2 , the upper end is the air inlet channel 7, and the lower end is the liquid inlet channel 8, wherein the air inlet channel 7 is narrow.

As shown in FIG. 2 and FIG. 3 , in some specific embodiments, an air inlet hole 9 is formed on the pintle 6 , and the air inlet hole 9 is connected to the air inlet channel 8 .

As shown in Figures 2 and 3, in some specific embodiments, an air outlet 10 is provided on the needle stem 5 on the same side as the air inlet 9 and connected to the needle tip 4, and the air outlet 10 is connected to the air inlet channel 7. It should be noted that the needle tip 4 is in a closed state.

As shown in FIG. 2 , in some specific embodiments, a film 11 is provided at the air inlet 9 , and the film 11 is made of expanded polytetrafluoroethylene material. It should be noted that the film of this material has the characteristics of being light, durable, waterproof, and breathable, and is breathable and liquid-proof.

As shown in FIG. 2 and FIG. 3 , in some specific embodiments, a valve 12 is further included. The valve 12 is detachably connected to the air inlet 9 . It should be noted that the size of the valve 12 matches that of the air inlet 9 .

It should be noted that, as shown in Figure 2, this valve 12 is in a closed state. In the closed state, air cannot enter the medicine bottle, and the pressure in the medicine bottle is negative. The injection needle 3 filled with solvent is inserted into the medicine bottle. Due to the negative pressure in the medicine bottle, the solvent in the syringe is automatically sucked into the medicine bottle. When the solvent completely enters the bottle, the valve 12 of the air inlet 9 is opened, and air enters the medicine bottle through the air inlet channel 9. Atmospheric pressure enters the medicine bottle, the air inlet 9 takes in air, and the air outlet 10 exhausts air. When pumping liquid, the piston is directly retracted. Since air continuously enters the medicine bottle, the pressure in the medicine bottle is balanced with the atmospheric pressure, which is convenient for pumping liquid medicine.

As shown in FIG. 2 and FIG. 3 , in some specific embodiments, the air inlet hole 9 is a circular hole, and the diameter of the air inlet hole 9 is 0.5 mm.

As shown in FIG. 2 and FIG. 3 , in some specific embodiments, the air inlet hole 9 is a circular hole, and the diameter of the air inlet hole 9 is 1 mm.

As shown in FIG. 2 and FIG. 3 , in some specific embodiments, the air inlet hole 9 is a circular hole, and the diameter of the air inlet hole 9 is 0.7 mm.

As shown in FIG. 2 and FIG. 3 , in some specific embodiments, the air outlet hole 10 is a circular hole, and the diameter of the air outlet hole 10 is 0.4 mm.

As shown in FIG. 2 and FIG. 3 , in some specific embodiments, the air outlet hole 10 is a circular hole, and the diameter of the air outlet hole 10 is 0.6 mm.

As shown in FIG. 2 and FIG. 3 , in some specific embodiments, the air outlet hole 10 is a circular hole, and the diameter of the air outlet hole 10 is 0.5 mm.

As shown in FIG. 2 , in some specific embodiments, a liquid inlet hole 13 is further provided on the needle stem 5 , and the liquid inlet hole 13 is communicated with the liquid inlet channel 8 .

As shown in FIG. 2 , in some specific embodiments, the liquid inlet 13 is 5 mm away from the tip of the needle tip 4 .

As shown in FIG. 2 , in some specific embodiments, the liquid inlet 13 is 7 mm away from the tip of the needle tip 4 .

As shown in FIG. 2 , in some specific embodiments, the liquid inlet 13 is 6 mm away from the tip of the needle tip 4 .

As shown in FIG. 2 , in some specific embodiments, the liquid inlet hole is an elliptical hole, and the specification of the liquid inlet hole 13 is 2.5*0.5 mm.

As shown in FIG. 2 , in some specific embodiments, the liquid inlet hole is an elliptical hole, and the specification of the liquid inlet hole 13 is 3.5 mm*1.5 mm.

As shown in FIG. 2 , in some specific embodiments, the liquid inlet hole is an elliptical hole, and the specification of the liquid inlet hole 13 is 3.0 mm*1.0 mm.

The above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope of the claims of the present invention.

Claims (7)

1. A syringe for dispensing medicines, comprising a syringe barrel (1), a piston (2), and an injection needle (3), wherein the injection needle (3) comprises a needle tip (4), a needle stem (5), and a needle plug (6), characterized in that an air inlet channel (7) and a liquid inlet channel (8) are provided inside the injection needle (3), and the air inlet channel (7) and the liquid inlet channel (8) are separated from each other; An air inlet hole (9) is provided on the pintle (6), and the air inlet hole (9) is connected to the air inlet passage (7); An air outlet hole (10) is provided on the needle stem (5) which is on the same side as the air inlet hole (9) and connected to the needle tip (4), and the air outlet hole (10) is connected to the air inlet channel (7); A film (11) is provided at the air inlet (9), and the film (11) is made of expanded polytetrafluoroethylene material; It also comprises a valve (12), wherein the valve (12) is detachably connected to the air inlet (9). 2. A syringe for dispensing medicine according to claim 1, characterized in that the diameter of the air inlet hole (9) is 0.7 mm. 3. The special syringe for dispensing medicine according to claim 1, characterized in that the diameter of the air outlet hole (10) is 0.5 mm. 4. A syringe for dispensing medicine according to claim 1, characterized in that a liquid inlet hole (13) is also provided on the needle barrel (5), and the liquid inlet hole (13) is connected to the liquid inlet channel (8). 5. A syringe for dispensing medicine according to claim 4, characterized in that the distance between the liquid inlet hole (13) and the tip of the needle tip (4) is 6 mm. 6. A syringe for dispensing medicine according to claim 5, characterized in that the liquid inlet hole (13) is an elliptical hole. 7. A syringe for dispensing medicine according to claim 6, characterized in that the specification of the liquid inlet hole (13) is 3.0 mm*1.0 mm.