CN203694267U - Filtration injector - Google Patents

Abstract

The utility model discloses a filter type syringe, which comprises a syringe and a filter injection needle. The injection needle is composed of a needle tube and a needle seat. The front ends of the upper and lower needle seats are combined with the upper needle seat to form a suction inlet and an injection outlet. A check valve is installed on the lower needle seat. The check valve is opened in the suction direction of the suction inlet and the injection direction of the injection outlet. A filter is installed on the outlet. The syringe of the utility model has the advantages of simple overall structure, convenient operation, safety and reliability, low cost and one-time use, and can effectively reduce drug impurities and cross-infection risks.

Description

a filter syringe

technical field

The utility model relates to a syringe, in particular to a filter type syringe. the

Background technique

As we all know, most of the injections currently used clinically are packaged in glass bottles. When the needle of the syringe is used to pierce the rubber stopper or cut the glass bottle with a grinding wheel to extract the medicinal solution, the bottle stopper chips or glass powder will enter the injection solution. Traditional syringes do not have a filter function. When liquid medicine is drawn, these impurities will be drawn into the syringe and injected directly into the patient, thereby inducing diseases such as venous inflammation. Chinese invention patent application CN102600535A discloses an injection needle with a precision filter, including a needle tube and a needle seat with an inner through hole, and the inner through hole of the needle seat includes an upper part with a smaller aperture, a lower part with a larger aperture, and a needle seat with a The middle part of the narrowing aperture structure is gradually converged upwards, one end of the needle tube is placed on the upper part of the inner through hole, and a filter is arranged in the inner through hole of the needle holder. Since the liquid inlet channel and the liquid outlet channel of the injection needle are the same channel, the injection needle needs to be replaced again after filtration, but there is a risk of contamination by bacteria or viruses during the replacement process of the filter needle and the injection needle, and the clinical operation is also inconvenient .

Contents of the invention

The purpose of the utility model is to provide a filter type syringe with simple structure, which can effectively realize the filter function and does not need to replace the needle during injection.

The technical scheme of the utility model is: a filter type syringe, including a syringe and a filter injection needle, the injection needle is composed of a needle tube and a needle seat, the needle tube is installed on the front end of the upper needle seat, and the rear end of the lower needle seat is connected to the syringe On the cone head, the front end of the lower needle seat is combined with the upper needle seat to form a suction inlet and an injection outlet. A check valve is installed on the lower needle seat. The check valve is in the suction direction of the suction inlet and the injection direction of the injection outlet. Open, with a filter installed on the injection outlet.

As a preferred structure, the middle part of the upper end of the lower needle seat extends upwards to form a cylindrical liquid channel, which becomes the injection outlet, and the surrounding of the injection outlet is the liquid inlet. The check valve is an umbrella-shaped structure, and the center of the check valve has a fixed The sleeve is placed on the outside of the cylindrical liquid channel, and a gap cavity is formed between the umbrella-shaped top of the check valve and the top of the cylindrical liquid channel. The umbrella-shaped top has an opening, and the edge extends downward to form a skin flap structure.

The check valve is made of elastic rubber material, preferably silica gel material.

The lower end of the cylindrical liquid channel is connected to the lower needle base through a connecting seat, and there are holes in the connecting seat to form a liquid inlet.

An annular groove is provided on the lower needle seat at the bottom end of the cylindrical liquid channel, and the filter membrane is welded in the annular groove.

The beneficial effect of the utility model is that the filtration and injection process of the filter type syringe is carried out automatically, the liquid medicine is only filtered during injection, no filtration is required when the medicine is withdrawn, no need to replace needles, and the possibility of bacterial and virus contamination is avoided. The automatic filtering syringe of the utility model has the advantages of simple overall structure, convenient operation, safety and reliability, low cost, disposable use, and effectively avoiding cross-infection.

Description of drawings

Fig. 1 is a schematic structural view of the filter syringe of the present invention.

Fig. 2 is a schematic diagram of the disassembled structure of the needle seat of the filter type syringe of the present invention.

Fig. 3 is a schematic diagram of the liquid flow in the needle holder when the utility model extracts the liquid medicine.

Fig. 4 is a schematic diagram of the liquid flow in the needle holder when injecting the medicinal liquid of the present invention.

In the figure, 1 syringe, 2 taper head, 3 injection needle, 4 needle tube, 5 needle seat, 6 upper needle seat, 7 lower needle seat, 8 suction inlet, 9 injection outlet, 10 check valve, 10a fixed sleeve, 10b umbrella Shaped top, 10c flap structure, 10d opening, 11 cylindrical liquid channel, 12 gap cavity, 13 connection seat, 14 pores, 15 annular groove, 16 filter membrane.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As can be seen from Figures 1-4, an automatic filter syringe includes a syringe 1 and an injection needle 3, the injection needle 3 is composed of a needle tube 4 and a needle seat 5, and the needle tube 4 is installed on the front end of the upper needle seat 6, The rear end of the lower needle seat 7 is connected to the cone head 2 of the syringe 1, the front end of the lower needle seat 7 is combined with the upper needle seat 6 to form a suction inlet 8 and an injection outlet 9, and a check valve 10 is installed on the lower needle seat 7 , the check valve 10 is opened in the suction direction of the suction inlet and the injection direction of the injection outlet, and a filter is installed on the injection outlet 9 .

As shown in Figure 2, Figure 3 and Figure 4, the middle part of the upper end of the lower needle seat 7 extends upwards to form a cylindrical liquid channel 11, which becomes the injection outlet 9, and the surrounding area of the injection outlet 9 is the liquid inlet 8, check valve 10 is an umbrella-shaped structure, and the center of the check valve 10 has a fixed sleeve 10a set on the outside of the cylindrical liquid passage 11. A gap cavity 12 is formed between the umbrella-shaped top 10b of the check valve and the top end of the cylindrical liquid passage 11, and the umbrella-shaped top 10b There is an opening 10d, the gap cavity 12 is conducive to the deformation of the umbrella-shaped top 10b, the opening 10d is blocked when the medicinal solution is extracted, and the opening 10d is opened when the medicinal solution is injected, and the edge extends downward to form a skin flap structure 10c, the skin flap structure 10c Similar to the hem of a skirt, it provides enough space for the fixing sleeve 10a inside, so that the fixing sleeve 10a and the outer surface of the cylindrical liquid channel 11 have a large bonding area, and the two fit tightly to prevent the liquid medicine in the syringe from flowing Fitted side through. The skin flap structure 10c can be retracted toward the fixing sleeve 10a to guide the inhaled medical solution to flow into the syringe smoothly. When injecting the liquid medicine, the skin flap structure 10c can be stretched outwards to fit in an interference fit with the inner wall of the upper needle holder 6 to block the suction inlet and ensure that the liquid flows out through the injection outlet.

The check valve 10 is made of elastic rubber material, preferably silicone material. The silicone material has great elasticity and good deformability, which can meet the needs of opening and closing channels.

An annular groove 15 is provided on the lower needle seat 7 at the bottom end of the cylindrical liquid channel 11 , and the filter membrane 16 is welded in the annular groove 15 . The lower end of the cylindrical liquid channel 11 is connected to the lower needle seat through a connection seat 13, and there is a hole 14 on the connection seat to form a liquid inlet. The connection seat 13 can be a cross-shaped structure as shown in the figure, or it can be other convenient connection Structure.

As shown in Figure 3, when the check valve 10 extracts the liquid medicine, under the action of negative pressure and liquid pressure, the umbrella edge, that is, the skin flap structure 10c, will shrink to form a liquid channel, and at the same time, the opening 10d of the umbrella-shaped top 10b will shrink due to extrusion. Closed, the liquid enters the syringe 1 through the edge of the umbrella through the hole 14 on the connecting seat; as shown in Figure 4, when the check valve 10 injects the liquid medicine, under the action of the liquid pressure, the edge of the umbrella, that is, the flap structure 10c, will Open and seal the liquid channel, the opening 10d of the umbrella-shaped top 10b will open under pressure to form a liquid channel, the liquid will pass through the filter membrane 16, enter the liquid channel of the upper needle seat through the opening 10d, and then pass through the needle tube 4 into the human body.

Claims (6)

1. a filter-type syringe, comprise syringe and filter entry needle, described entry needle is made up of needle tubing and needle stand, needle tubing is arranged on the front end of needle stand, the rear end of lower needle stand is connected on the conehead of syringe, it is characterized in that: the front end of lower needle stand is combined with upper needle stand and is formed imbibition entrance and injection outlet, on lower needle stand, check-valves is installed, check-valves is opened in the imbibition direction of imbibition entrance and the injection direction of injection outlet, in injection outlet, filter is installed.

2. filter-type syringe according to claim 1, it is characterized in that: the mid portion of lower needle stand upper end upwards extends to form column type fluid passage, this fluid passage becomes injection outlet, injection outlet is around liquid inlet, check-valves is umbrella-shaped structure, and check-valves center has a fixed cover to be enclosed within the outside of column type fluid passage, between the top of check-valves umbrella top and column type fluid passage, forms spatia, one opening is arranged at umbrella top, and edge extends to form flap structure downwards.

3. filter-type syringe according to claim 1 and 2, is characterized in that: described check-valves adopts resilient elastomeric material to make.

4. filter-type syringe according to claim 3, is characterized in that: described check-valves adopts silica gel material to make.

5. filter-type syringe according to claim 2, is characterized in that: the lower end of described column type fluid passage is connected by Connection Block with lower needle stand, has hole on Connection Block, forms liquid inlet.

6. filter-type syringe according to claim 2, is characterized in that: the lower needle stand at the bottom place of described cylinder fluid passage is provided with an annular groove, and filter membrane is welded in annular groove.