CN103736174B - A kind of two-way filtration syringe - Google Patents

Abstract

The invention discloses a two-way filtering syringe, which includes a syringe and a filtering 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. Filters are installed on the liquid inlet and injection outlet. The two-way filter syringe has the advantages of simple overall structure, convenient operation, safety and reliability, low cost, one-time use, and the ability to effectively avoid cross-infection.

Description

A two-way filter syringe

technical field

The invention relates to a syringe, in particular to a two-way filtering syringe.

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 object of the present invention is to provide a two-way filtering syringe with simple structure, which can effectively realize the filtering function and does not need to change needles during injection.

The technical solution of the present invention is: a two-way filter 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 filters installed on suction inlet and 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 edge boss is provided on the upper edge of the connecting seat, and an intermediate boss is arranged outside the cylindrical liquid channel corresponding to the edge boss, and the liquid-absorbing filter membrane is welded on the edge boss and the middle boss, and the liquid-absorbing filter membrane Except for the welding part, the other parts are not in contact with the upper needle seat and the lower needle seat, forming a suspended state, which improves the effective filtering area.

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

The beneficial effect of the invention is that the filtration and injection processes are carried out through two independent channels, no needles need to be replaced, and infection with bacteria and viruses and cross-contamination are avoided. At the same time, the liquid medicine is filtered during both pumping and injection, which not only filters the impurities in the liquid medicine, but also filters the impurities in the syringe. The two-way filter syringe of the present invention has the advantages of simple overall structure, convenient operation, safety and reliability, low cost, disposable use, and the ability to effectively avoid cross-infection.

Description of drawings

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

Fig. 2 is a schematic diagram of the disassembled structure of the needle seat of the two-way filtering syringe of the present invention.

Fig. 3 is a schematic diagram of the liquid flow in the needle seat when the liquid medicine is extracted according to the present invention.

Fig. 4 is a schematic diagram of the liquid flow in the needle holder when injecting the medicinal liquid according to 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 connecting seat, 14 hole, 15 edge boss, 16 middle boss, 17 liquid suction filter membrane, 18 annular groove, 19 Injection filter.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As can be seen from Figures 1 to 4, a two-way filter syringe of the present invention 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 upper needle seat 6 The front 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 stopper is installed on the lower needle seat 7. Back valve 10, the check valve 10 is opened in the suction direction of the suction inlet and the injection direction of the injection outlet, and filters are installed on the suction inlet 8 and 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.

The lower end of the cylindrical liquid channel 11 is connected to the lower needle seat 7 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 connected structure. In order to facilitate the installation of the filter device, an annular edge boss 15 is provided on the upper edge of the connecting seat 13, and an intermediate boss 16 is arranged outside the cylindrical liquid channel 11 corresponding to the edge boss 15, and the liquid-absorbing filter membrane 17 is welded to the edge boss. 15 and the middle boss 16, except the welded part, the liquid-absorbing filter membrane 17 does not contact with the upper needle seat 6 and the lower needle seat 7, forming a suspended state, which improves the effective filtration area.

An annular groove 18 is provided on the lower needle seat 7 at the bottom end of the cylindrical liquid passage 11, and the injection filter membrane 19 is welded in the annular groove 18.

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 passes through the liquid-absorbing filter membrane 17 through the edge of the umbrella, and enters the syringe 1 through the hole 14 on the connecting seat; as shown in Figure 4, when the check valve 10 injects the liquid medicine, the umbrella The side, that is, the flap structure 10c will open to seal the liquid channel, and the opening 10d of the umbrella-shaped top 10b will open to form a liquid channel under pressure, and the liquid will pass through the injection filter membrane 19, enter the upper needle through the cylindrical liquid channel 11, and pass through the opening 10d. Seat liquid channel, then enter the human body through the needle tube 4.

Claims (6)

1. a two-way filtration 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 to form imbibition entrance and inject and exports, lower needle stand is provided with check-valves, check-valves is opened at the injection direction of the imbibition direction of imbibition entrance and injection outlet, imbibition entrance and injection outlet are all provided with filter, 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, check-valves center has a fixed cover to be enclosed within the outside of column type fluid passage, spatia is formed between the top of check-valves umbrella top and column type fluid passage, one opening is arranged at umbrella top, edge extends to form flap structure downwards.

2. two-way filtration syringe according to claim 1, is characterized in that: described check-valves adopts resilient elastomeric material to make.

3. two-way filtration syringe according to claim 2, is characterized in that: described check-valves adopts silica gel material to make.

4. two-way filtration syringe according to claim 1, is characterized in that: the lower end of described column type fluid passage is connected by Connection Block with lower needle stand, and Connection Block has hole, forms liquid inlet.

5. two-way filtration syringe according to claim 1, it is characterized in that: described Connection Block top edges is provided with the edge lug boss of an annular, outside column type fluid passage and edge lug boss corresponding section is provided with intermediate lands, on imbibition filter membrane welding edge boss and intermediate lands, imbibition filter membrane is except welding portion, the upper needle stand of remainder discord contacts with lower needle stand, forms vacant state.

6. two-way filtration syringe according to claim 1, is characterized in that: the lower needle stand of the bottom end of described cylinder fluid passage is provided with an annular groove, and injection filter membrane is welded in annular groove.