CN103203052A - Safety pre-filling injector for irrigating catheters - Google Patents

Abstract

The invention discloses a safe prefilled flushing syringe, comprising: a sleeve, a locking cap, a cone head connected with a conduit connector on the top of the sleeve, and a cone section of the sleeve formed between the cone head and the cylinder of the sleeve. A fixing tube is processed on the cone section of the sleeve, the inner side of the fixing tube is provided with a fixing tube thread, the outer side is the outer cone surface of the fixing tube, the top of the fixing tube has the top surface of the fixing tube, and the sleeve cone between the fixing tube and the cone head The section is the top plate of the sleeve; the locking cap is composed of an inner ring of the locking cap and an outer ring of the locking cap. The inner surface of the outer ring of the locking cap is the conical surface of the cap, and the conical surface of the cap is extended to the outside of the outer conical surface of the fixed cylinder. The surface between the inner ring of the cap and the outer ring of the cap and the top surface of the fixed cylinder is a sealing contact plate; At least one protective barrier is provided on the channel where the outer surface of the cone head communicates with the outside world.

Description

A safe prefilled flushing syringe

technical field

The invention relates to a syringe, in particular to a safe prefilled syringe for flushing catheters.

Background technique

Intravenous catheters are a commonly used treatment device. The setting of intravenous catheters can facilitate treatment. For example, drugs can be input into the human body through intravenous catheters. These catheters need to be flushed to keep the catheter open and intact. The prefilled flushing syringe is equipped with Fluids for flushing catheters, such as saline solution, heparin, etc. for injection.

Pre-flushed syringes cannot be sterilized by conventional syringe sterilization methods such as ethylene oxide sterilization because the syringes are filled with liquid for flushing catheters, but steam sterilization methods are used. Ethylene oxide sterilization method, the inside of the outer packaging bag of the syringe is in a vacuum state, so as to ensure the sterility of the syringe. Steam sterilization is adopted, and the outer packaging bag has air permeability, but the aseptic environment in the outer packaging bag cannot be guaranteed. Therefore, the sterile protection structure at the pre-flush syringe joint is very important, otherwise it will become a source of contamination and infect patients. The currently used pre-flush type flushing syringe, as shown in Figure 1, is provided with a fixed cylinder 4 with an internal thread on the periphery of the cone head 2 at the top of the sleeve 1, and the internal thread of the fixed cylinder 4 cooperates with the external thread of the locking cap 9. The inner wall of the locking cap 9 is in close contact with the outer wall of the cone 2 to protect the cone 2 . The cap portion a of the upper end of the locking cap 9 threaded portion is opposite to the upper end b of the fixed cylinder, and the locking cap thread has an exposed part therebetween. The syringe with this structure has the following defects: (1) the locking cap 9 cannot fully reach the sleeve top plate 8 in the fixed barrel, and the sleeve top plate 8 in contact with the connecting piece (such as a positive pressure joint) is easily polluted; (2) the exposed If the external thread is polluted, it will contact with the thread of the fixed cylinder after tightening, which may bring the contamination into the cone of the syringe; (3) The diameter of the locking cap is small, and it is inconvenient to unscrew the locking cap; (4) The locking cap Long and takes up a lot of space.

Once the conical head of a flushing syringe is contaminated, bacteria and other pollutants will enter the connection between the flushing syringe and the intravenous catheter, such as positive pressure connectors, during use. The polluted connecting piece is used as a pollution source, and when the connecting piece is used to flush the venous catheter again, the pollutants on the connecting piece will be flushed into the catheter and enter the human body.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned shortcomings, and provide a safe prefilled flushing syringe for flushing and sealing venous catheters.

The present invention is achieved like this: a kind of safety type pre-filled flushing syringe comprises:

The sleeve, the locking cap, and the top of the sleeve have a conical head connected to the conduit connector, and the conical section of the sleeve is formed between the conical head and the cylinder of the sleeve. A fixing tube is processed on the cone section of the sleeve. The inner side of the fixing tube is provided with a fixing tube thread, the outer side is the outer cone surface of the fixing tube, the top of the fixing tube has the top surface of the fixing tube, and the sleeve cone between the fixing tube and the cone head The section is the top plate of the sleeve;

The locking cap is composed of the inner ring of the locking cap and the outer ring of the locking cap. There are cap threads on the outer wall of the inner ring of the locking cap that match the thread of the fixing cylinder. The bottom of the inner ring is opposite to the top plate of the sleeve. It is the conical surface of the cap, the conical surface of the cap extends to the outside of the outer conical surface of the fixed cylinder, and the surface between the inner ring of the cap and the outer ring of the cap and the top surface of the fixed cylinder is a sealing contact plate;

After the locking cap is matched with the fixing cylinder, at least one protective barrier is provided on the channel where the outer surface of the cone head communicates with the outside world.

The protective barrier can be arranged between the sealing bottom plate of the cap and the top plate of the sleeve, or between the top surface of the fixing cylinder and the sealing contact plate, or anywhere between the outer cone surface of the fixing cylinder and the cone surface of the cap.

It is also possible to extend the outer ring of the locking cap to the cone section of the sleeve, process a sealing bottom plate at the bottom of the outer ring, set a sealing fixing plate opposite the cone section of the sleeve and the sealing bottom plate, and set a protective barrier between the sealing fixing plate and the sealing bottom plate .

 The protective barrier adopts any method such as close contact or adding a gasket to play the role of sealing and preventing bacteria.

The beneficial effects of the present invention are: 1. At least one protective barrier is provided on the channel where the outer surface of the cone head communicates with the outside world, so as to fully protect the portion of the cone head that is in direct contact with the connector during use, and avoid contamination caused by the cone head. 2. The locking cap adopts an inner ring and outer ring structure, and the outer ring extends downward to cover the top surface of the fixed cylinder, which protects the cap threads that may come into contact with liquid and reduces the risk of contamination; 3. The locking cap increases The outer ring structure has a large cap diameter, which is more convenient and labor-saving to screw the cap; 4. The outer ring of the locking cap can be used as the force part when screwing the cap, which shortens the length of the cap part used for screwing the cap in the prior art and saves packaging materials.

Description of drawings

Fig. 1 Schematic diagram of the structure of the prefilled flushing syringe in the prior art;

Fig. 2 is the sectional structure schematic diagram of the present invention;

Fig. 3 is a top view of the present invention;

The labels in the figure are explained as follows:

1. Sleeve, 2. Cone head, 3. Sleeve cone section, 4. Fixing barrel, 5. Fixing barrel thread, 6. Outer cone surface of fixing barrel, 7. Top surface of fixing barrel, 8. Sleeve top plate, 9 , Locking cap, 10, Cap inner ring, 11, Locking cap outer ring, 12, Cap thread, 13, Cap sealing bottom plate, 14, Cap cone, 15, Sealing contact plate, 16, Sealing bottom plate, 17, Sealing fixing plate .

Detailed ways

On the inner side of the upper part of the sleeve 1, a cone head 2 connected to the conduit connector is processed, and on the outer side, a sleeve cone section 3 is processed. On the top of the sleeve cone section 3, a fixed cylinder 4 is processed. There are fixing tube threads 5, the outside is processed with fixing tube outer cone surface 6, and the top of fixing tube 4 is processed with fixing tube top surface 7, and the sleeve cone section 3 between fixing tube 4 and the cone head is sleeve top plate 8.

The locking cap 9 is composed of an inner ring 10 of the locking cap and an outer ring 11 of the locking cap. On the outer wall of the inner ring 10 of the locking cap, there are cap threads 12 that cooperate with the thread 5 of the fixing cylinder. The bottom of the inner ring 10 is sealed against the sleeve top plate 8. The bottom plate 13, the inner surface of the locking cap outer ring 11 is the cap cone surface 14, the cap cone surface 14 is extended to the outside of the outer cone surface 6 of the fixed cylinder, and the surface between the cap inner ring 10 and the cap outer ring 11 is sealed against the fixed cylinder top surface 7 Contact plate 15.

After the locking cap 9 cooperates with the fixed cylinder 4, at least one protective barrier is provided on the channel where the outer surface of the cone head 2 communicates with the outside world. The protective barrier can be arranged between the cap sealing bottom plate 13 and the sleeve top plate 8, between the fixed cylinder top surface 7 and the sealing contact plate 15, and between the fixed cylinder outer cone surface 6 and the cap cone surface 14. It is also possible to extend the outer ring of the locking cap to the cone section 3 of the sleeve, and a sealing bottom plate 16 is processed at the bottom of the outer ring, and a sealing fixing plate 17 is arranged at the opposite position between the cone section 3 of the sleeve and the sealing bottom plate 16, and the sealing fixing plate 17 is connected to the sealing bottom plate 16. Protective barriers are set between the base plates 16 . The protective barrier adopts any method such as close contact or sealing gasket to play the role of sealing and preventing bacteria.

To sum up, the present invention avoids the risk of conical head contamination because the locking cap 9 cooperates with the fixed cylinder 4 to provide a protective barrier. At the same time, the outer ring 11 structure is added to the locking cap 9, and the locking cap 9 has a large diameter, which makes screwing the cap more convenient and labor-saving; the height is reduced, which saves packaging materials.

Claims (4)

1. A safe pre-filled flushing syringe, comprising: a sleeve, a locking cap, a cone connected to the catheter connector at the top of the sleeve, a cone section of the sleeve is formed between the cone and the cylinder of the sleeve, and the sleeve The upper surface of the cone section of the cylinder is processed with a fixed cylinder, the inner side of the fixed cylinder is provided with the fixed cylinder thread, the outer side is the outer cone surface of the fixed cylinder, the top of the fixed cylinder has the top surface of the fixed cylinder, and the sleeve cone section between the fixed cylinder and the joint is a sleeve. cylinder roof; characterized in that: The locking cap is composed of the inner ring of the locking cap and the outer ring of the locking cap. There are cap threads on the outer wall of the inner ring of the locking cap that match the thread of the fixing cylinder. The bottom of the inner ring is opposite to the top plate of the sleeve. It is the conical surface of the cap, the conical surface of the cap extends to the outside of the outer conical surface of the fixed cylinder, and the surface between the inner ring of the cap and the outer ring of the cap and the top surface of the fixed cylinder is a sealing contact plate; After the locking cap is matched with the fixing cylinder, at least one protective barrier is provided on the channel where the outer surface of the cone head communicates with the outside world. 2. The safety type prefilled flushing syringe according to claim 1, wherein the protective barrier is arranged between the sealing bottom plate of the cap and the top plate of the sleeve, or between the top surface of the fixed cylinder and the sealing contact plate, Or at the outer conical surface of the fixing sleeve and the conical surface of the cap. 3. The safe pre-filled flushing syringe according to claim 1, characterized in that the outer ring of the locking cap extends toward the cone section of the sleeve, and a sealing bottom plate is processed at the bottom of the outer ring, and the cone section of the sleeve and the seal A sleeve top plate is arranged opposite to the bottom plate, and a protective barrier is set between the sleeve top plate and the sealing bottom plate. 4. The safety prefilled flushing syringe according to any one of claims 1-3, characterized in that, the protective barrier is set in a manner of close contact or sealing.

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