CN203677628U - Needle-free medicine adding and infusion positive pressure joint - Google Patents

Abstract

The utility model discloses a needle-free medicine adding and infusion positive pressure joint which comprises a casing, wherein the casing is divided into a vertical section and a horizontal section arranged in the middle of the vertical section and connected with the vertical section; a hollow rubber plug is arranged in the vertical section; the upper part of the hollow rubber plug is connected in an insertion way and fixed with a semi-rigid rubber plug inner core; an interlayer for supporting the rubber plug inner core is arranged in the middle of the hollow rubber plug; a sealing structure is formed between the outer wall of the top of the hollow rubber plug and the inner wall of the upper part of the vertical section; the hollow rubber plug is used for partitioning the vertical section and the horizontal section; the bottom of the hollow rubber plug is fixed with the bottom of the vertical section through a hollow spacer positioned in the casing. The needle-free medicine adding and infusion positive pressure joint has the technical effects as follows: when an injecting syringe is pulled out, sufficient positive pressure can be provided, reflux of blood of a human body is prevented, residual quantity of liquid medicine in the needle-free medicine adding and infusion positive pressure joint is reduced, waste of the liquid medicine is reduced, and accuracy in medicine dosage is ensured.

Description

A positive pressure connector for needle-free drug dosing infusion

technical field

The utility model relates to a positive-pressure connector for needle-free drug-dosing transfusion in the field of medical equipment.

Background technique

The needle-free drug dosing infusion positive pressure connector is mainly used for injection of liquid medicine, gravity infusion, and liquid extraction in medical treatment. It can be connected with intravenous infusion sets, intravenous catheters and other injection devices. Pollution of particles and debris from human capillaries. When the injection device is pulled out, the needle-free drug-dosing infusion positive pressure connector generates a positive pressure, which automatically pushes the liquid in the intravenous infusion set, intravenous catheter, etc. forward, preventing blood backflow and the formation of thrombus. The main problem of the current positive-pressure connector for needle-free drug-adding infusion is that when the injection device is pulled out, the positive pressure provided by the needle-free drug-adding infusion positive-pressure connector is insufficient, resulting in a large amount of liquid medicine remaining in the positive-pressure connector for needle-free drug-adding infusion In this way, a large amount of medicinal liquid is wasted, which can affect the accuracy of dosage and delay the treatment of patients. At the same time, there is still a metal structure inside the positive pressure connector for needle-free drug dosing infusion, which will affect the accuracy of the inspection results during the MRI examination.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art, and provide a positive pressure connector for needle-free medicine-dosing infusion, which can provide a greater positive pressure when the injection device is pulled out, and reduce the amount of medicine liquid in the needle-free medicine-dosing infusion. The residual amount in the positive pressure joint reduces the waste of liquid medicine and ensures the accuracy of the dosage.

A technical solution to achieve the above object is: a positive pressure connector for needle-free drug dosing infusion, including a housing, the housing is divided into a vertical section, and a horizontal section connected to the vertical section in the middle of the vertical section ;

The vertical section is provided with a hollow rubber plug, the upper part of the hollow rubber plug is fixed with a semi-rigid rubber plug inner core, and the middle part of the hollow rubber plug is provided with an interlayer supporting the rubber plug inner core , a sealing structure is formed between the outer wall of the top of the hollow rubber plug and the inner wall of the upper part of the vertical section; the hollow rubber plug separates the vertical section from the horizontal section, and the bottom of the hollow rubber plug is connected to the The bottoms of the vertical sections are held together by hollow spacers located within the housing.

Further, the hollow gasket includes a gasket body plugged and fixed to the bottom of the inner wall of the hollow rubber plug, and a gasket flange located at the bottom of the gasket body, and the top surface of the gasket flange is connected to the bottom of the gasket body. The bottom surface of the hollow rubber plug is fixed, the side of the gasket flange is close to the inner wall of the vertical section, and the bottom of the vertical section is provided with a radially inwardly protruding support member to support the gasket flange the underside.

Still further, a decompression notch is provided on the flange of the gasket.

Still further, the middle part of the hollow rubber plug is provided with a rubber plug flange on the outer wall of the hollow rubber plug, and the rubber plug flange is close to the inner wall of the vertical section, and connects the vertical section to the vertical section. Said horizontal segment partition.

Further, the inner core of the rubber plug includes an inner core body inserted and fixed to the inner wall of the hollow rubber plug and an inner core flange located on the top of the inner core body, the bottom surface of the inner core flange is connected to the inner core body. The top surface of the hollow rubber plug is fixed.

Still further, a liquid inlet is provided at the center of the top surface of the inner core of the rubber plug.

Further, a screw cap is sleeved on the outer wall of the upper part of the vertical section.

Further, a screw socket is socketed on the outer wall of the horizontal section, and an inner screw protective cap is socketed between the screw socket and the radial direction of the horizontal section.

Further, both the shell and the hollow spacer are transparent.

Still further, both the shell and the hollow gasket are made of medical polycarbonate, the inner core of the rubber plug is made of medical polyoxymethylene, and the hollow rubber plug is made of medical silicone.

The technical scheme of a positive pressure connector for needle-free dosing infusion of the utility model is adopted, that is, a hollow rubber plug is arranged in the vertical section of the shell, and a semi-rigid rubber plug inner core is inserted and fixed on the upper part of the hollow rubber plug. The middle part of the hollow rubber plug is provided with a compartment to support the inner core of the rubber plug. A sealing structure is formed between the outer wall of the top of the hollow rubber plug and the inner wall of the upper part of the vertical section. The hollow rubber plug separates the vertical section of the shell from the horizontal section of the shell. The bottom of the rubber plug and the bottom of the vertical section of the shell are fixed by a hollow gasket inside the shell. Its technical effect is: when the injection device is pulled out, it can provide sufficient positive pressure to prevent the reflux of human blood, reduce the residual amount of medicinal liquid in the positive pressure joint of needle-free drug dosing infusion, and reduce the waste of medicinal liquid. Ensure the accuracy of dosage.

Description of drawings

Fig. 1 is a right side view of a positive pressure connector for needle-free drug dosing infusion of the present invention.

Fig. 2 is a cross-sectional view of A-A plane of a positive pressure connector for needle-free drug dosing infusion of the present invention.

Fig. 3 is a top view of a hollow spacer in a positive pressure connector for needle-free drug dosing infusion according to the present invention.

Fig. 4 is a cross-sectional view of A-A plane of a positive pressure joint for needle-free drug dosing infusion of the present invention in the state of infusion.

Detailed ways

Please refer to Fig. 1 to Fig. 4, in order to better understand the technical solution of the present utility model, the inventor of the utility model will describe in detail below through specific embodiments in conjunction with the accompanying drawings:

Please refer to Fig. 1 to Fig. 4, a kind of positive pressure connector for needle-free medicine dosing infusion of the present utility model, comprises casing 1, and casing 1 has the structure of three-way pipe, and casing 1 is divided into the vertical section 11 of opening at both ends, and In the middle of the vertical section 1 , a horizontal section 12 adjoining the vertical section 11 . The radial center of the horizontal section 12 forms a liquid outlet 121 through which the medicinal liquid flows out of the positive pressure connector for needle-free drug dosing infusion.

A hollow rubber plug 2 is arranged in the vertical section 11 , and a semi-rigid rubber plug inner core 3 is inserted and fixed on the upper part of the hollow rubber plug 2 . The rigidity of the rubber plug inner core 3 must be greater than that of the hollow rubber plug 2 . The middle part of the hollow rubber plug 2 is provided with an interlayer 21 inside the hollow rubber plug 2 for supporting the inner core 3 of the rubber plug. The upper part of the hollow rubber plug 2 is equivalent to having a semi-rigid structure, and basically does not deform after being stressed.

At the same time, the upper part of the vertical section 11, that is, the part of the vertical section 11 higher than the horizontal section 12, and the lower part of the vertical section 11, that is, the part of the vertical section 11 that is lower than the horizontal section 12. In order to make the positive-pressure connector for needle-free drug-dosing infusion withstand certain human blood pressure without leakage; to separate the space inside the positive-pressure connector for needle-free drug-dosing infusion from the outside space, thereby preventing the contamination of outside air and bacteria; During the infusion process, it provides the squeezing force to squeeze the medicinal liquid out of the horizontal section 12, and also in order to generate sufficient positive pressure in the positive pressure joint of the needle-free drug-adding infusion when the injection device 7 is pulled out, and the top of the hollow rubber plug 2 A sealing structure must be formed between the outer wall of the vertical section 11 and the inner wall at the top of the vertical section 11.

In this embodiment, the top of the hollow rubber plug 2 is provided with an upper flange 23 on the outer wall of the hollow rubber plug 2 with an axial length of 0.5-1 mm. The upper flange 23 is close to the inner wall of the upper part of the vertical section 11, so that A sealing structure is formed between the outer wall at the top of the hollow rubber plug 2 and the inner wall at the top of the vertical section 11 . It must be noted that the sealing structure formed between the outer wall of the upper part of the hollow rubber plug 2 and the inner wall of the upper part of the vertical section 11 is not limited to the way of setting the upper flange 23, and the axial length of the upper flange 23 is not limited to 0.5～1mm.

At the same time, the outer wall of the hollow rubber plug 2 separates the vertical section 11 from the horizontal section 12 , so that a sealing structure is also formed between the hollow rubber plug 2 and the horizontal section 12 .

There is a gap between the outer wall of the lower part of the hollow rubber plug 2 and the inner wall of the lower part of the vertical section 11 . The function of this gap is to provide sufficient space for the high elastic compression deformation of the lower part of the hollow rubber stopper 2 when the injection device 7 is inserted from the top of the vertical section 11 .

The bottom of the hollow rubber plug 2 is provided with a hollow gasket 4 inside the casing 1 . Fix the bottom of the vertical section 11 with the bottom of the hollow rubber plug 2 .

After the conical interface 71 of the injection device 7 is inserted from the top of the vertical section 11 into the positive pressure connector for needle-free dosing infusion, the injection device 7 acts on the inner core 3 of the rubber stopper, and the inner core 3 of the rubber stopper transmits the force to the hollow rubber stopper 2 on. The hollow rubber plug 2 and the rubber plug inner core 3 move down as a whole, and the upper part of the hollow rubber plug 2, that is, the part above the interlayer 21, is basically not deformed. The lower part of the hollow rubber plug 2, that is, the part below the interlayer 21, undergoes high elastic compression deformation, which is equivalent to playing the role of a spring.

As the lower part of the hollow rubber plug 2 undergoes high elastic compression deformation, the gap formed between the outer wall of the upper part of the hollow rubber plug 2 and the inner wall of the vertical section 11 is used to store medicinal liquid. At the same time, the vertical section 11 communicates with the horizontal section 12 . The liquid medicine overflows from the liquid inlet 33 on the top surface of the rubber plug inner core 3, and fills the upper part of the hollow rubber plug 2 along the three evenly distributed overflow grooves (not shown in Fig. 2 and Fig. 4 ) on the inner wall of the vertical section 11 In the gap between the outer wall and the inner wall of the vertical section 11. Next, the medical solution flows out of the positive pressure connector for needle-free drug-adding infusion along the horizontal section 12 . The positive pressure connector for needle-free dosing infusion is in the injection state.

After the injection device 7 is pulled out, the high elastic compression deformation of the lower part of the hollow rubber plug 2 recovers, and the outer wall of the hollow rubber plug 2 re-segregates the vertical section 11 and the horizontal section 12 . During this process, due to the recovery of the high-elastic compression deformation of the hollow rubber plug 2, a sufficient positive pressure is generated in the positive pressure connector for needle-free drug dosing infusion, which automatically pushes the medicinal liquid forward along the horizontal section 12 to prevent blood from flowing back into the horizontal section 12. Paragraph 12, Avoid Thrombosis.

Through the above-mentioned design, when the injection device 7 is pulled out, the positive pressure connector for needle-free drug dosing infusion can provide a large enough positive pressure to prevent the blood from flowing back into the horizontal section 12, avoiding the formation of thrombus, and reducing the pressure of the drug solution during needle-free drug dosing. The residual volume in the infusion positive pressure connector reduces the waste of liquid medicine and ensures the accuracy of the dosage.

In this embodiment, the hollow gasket 4 includes a gasket body 41 fixed to the bottom inner wall of the hollow rubber plug 2, and a gasket flange 42 located at the bottom of the gasket body 41. The top surface of the gasket flange 42 is in contact with the hollow The bottom surface of the rubber plug 2 is fixed, and the side of the gasket flange 42 is close to the inner wall of the vertical section 11 to form a sealing structure. The bottom of the vertical section 11 is provided with a radially inwardly protruding support member 111, supporting the gasket flange 42 The bottom surface, thereby facilitating the positioning of the hollow gasket 4 in the housing 1. The purpose of this design is to increase the contact area between the hollow gasket 4 and the bottom of the vertical section 11 , distribute the force, and prevent the vertical section 11 from cracking during use. The hollow gasket 4, that is, the radial center of the hollow gasket 4 is provided with a through hole 43, and its function is to reduce the resistance of the lower part of the hollow rubber plug 2 in the high elastic compression deformation.

In order to further reduce the resistance of the lower part of the hollow rubber plug 2 in high elastic compression deformation, the gasket flange 42 of the hollow gasket 4 is provided with a decompression notch 421 located on the radial edge of the gasket flange 42 . When the lower part of the hollow rubber plug 2 undergoes high elastic compression deformation, the air in the gap between the outer wall of the lower part of the hollow rubber plug 2 and the inner wall of the lower part of the vertical section 11 can be discharged through the decompression gap 421 . After the lower part of the hollow rubber plug 2 completes high elastic compression deformation, a sealing structure is formed between the outer wall of the lower part of the hollow rubber plug 2 and the inner wall of the lower part of the vertical section 11, so that the liquid medicine will not drip from the bottom of the vertical section 11.

In this embodiment, the middle part of the hollow rubber plug 2 is provided with a rubber plug flange 22 located on the outer wall of the hollow rubber plug 2. The purpose of the rubber plug flange 22 is to connect the positive pressure joint of the needle-free medication infusion with the human body without When deformed by injection, the rubber plug flange 22 and the inner wall of the vertical section 11 form a seal structure, so that the positive pressure joint of the needle-free drug dosing infusion can withstand a certain human blood pressure without leakage; at the same time, it prevents external air and bacteria from entering and causing pollute.

In this embodiment, the inner core 3 of the rubber plug includes an inner core body 31 which is plugged and fixed with the inner wall of the hollow rubber plug 2 and an inner core flange 32 located on the top of the inner core body 31 , the bottom surface of the inner core flange 32 is connected to the hollow rubber plug. The top surface of the plug 2 is fixed. The purpose of this design is to ensure that the upper part of the hollow rubber plug 2 does not undergo high elastic compression deformation, and at the same time ensure that the outer wall of the upper part of the hollow rubber plug 2 is in contact with the inner wall of the vertical section 11 when the positive pressure joint of the needle-free drug dosing infusion is in the infusion state. A gap can be formed between them, so that the medicinal liquid can smoothly flow out of the needle-free drug-adding infusion positive pressure joint through the horizontal section 12.

At the same time, the center of the top surface of the rubber plug inner core 3 is provided with a liquid inlet 33, and the medicinal liquid in the injection device 7 just passes through the liquid inlet 33, and then overflows from three overflow grooves evenly distributed on the inner wall of the vertical section 11. , fill the gap between the outer wall of the upper part of the hollow rubber plug 2 and the inner wall of the vertical section 11, and flow out of the positive pressure connector for needle-free drug dosing infusion along the horizontal section 12.

In this embodiment, a screw socket 61 is sleeved on the outer wall of the horizontal section 12, and an inner screw cap 62 is sleeved between the screw socket 61 and the radial direction of the horizontal section 12 to protect the liquid outlet 121 from the outside air. Dust and bacterial contamination.

At the same time, a screw cap 5 is sleeved on the outer wall of the upper part of the vertical section 11 , and the screw cap 5 is fixed by an external thread 112 on the outer wall of the top of the vertical section 11 . The role of the screw cap 5 is to act as a protective cap on the liquid inlet end of the positive pressure connector of the needle-free drug dosing infusion, which prevents the hollow rubber plug 2 at the liquid inlet end and the top surface of the rubber plug inner core 3 from being exposed to the outside and being exposed by the outside air. Possibility of contamination by dust and bacteria in the medium, which is not present in other positive pressure joints for needle-free drug dosing infusion. Another function of the external thread 112 is to fix the injection device 7 after the conical interface 71 of the injection device 7 is inserted into the top of the vertical section 11 , as shown in FIG. 4 .

The shell 1 and the hollow spacer 4 are made of transparent plastic, and the high elastic compression deformation of the hollow rubber plug 2 of the positive pressure joint for needle-free medicine dosing infusion can be seen. The flow is also visible, whether the needle-free drug dosing infusion joint is completely flushed by the drug solution, or whether blood backflow occurs is also visible, which is superior to similar products in the prior art.

At the same time, in order to achieve high elastic compression deformation of the hollow rubber plug 2, the hollow rubber plug 2 is made of medical silica gel. The rigidity of the rubber plug inner core 3 and the hollow gasket 4 is greater than that of the hollow rubber plug 2, so the material of the rubber plug inner core 3 is preferably medical polyoxymethylene, which is opaque. The hollow gasket 4, the shell 1, and the screw port 61 The material is preferably medical polycarbonate, which is transparent. The material of the internal screw protective cap 62 is preferably medical polypropylene, and the material of the screw-on cap 5 is preferably medical polyethylene, both of which are opaque. In this embodiment, there are no metal parts inside the positive-pressure connector for needle-free drug-adding infusion, which ensures the correct result of nuclear magnetic resonance examination for infusion patients.

Claims (10)

1. A positive pressure joint for needle-free drug dosing infusion, comprising a housing (1), the housing (1) is divided into a vertical section (11), and in the middle of the vertical section (11), it is connected to the vertical section ( 11) A contiguous horizontal section (12); characterized in that: The vertical section (11) is provided with a hollow rubber plug (2), the upper part of the hollow rubber plug (2) is plugged and fixed with a semi-rigid rubber plug core (3), and the hollow rubber plug (2) ) is provided with a partition (21) supporting the inner core (3) of the rubber plug, and a sealing structure is formed between the outer wall of the top of the hollow rubber plug (2) and the upper inner wall of the vertical section (11); The hollow rubber plug (2) separates the vertical section (11) from the horizontal section (12), and the bottom of the hollow rubber plug (2) and the bottom of the vertical section (11) are located at The hollow gasket (4) inside the shell (1) is fixed. 2. A needle-free medicated infusion positive pressure connector according to claim 1, characterized in that: the hollow gasket (4) includes a gasket that is plugged and fixed with the bottom of the inner wall of the hollow rubber plug (2) body (41), and a gasket flange (42) located at the bottom of the gasket body (41), the top surface of the gasket flange (42) is fixed to the bottom surface of the hollow rubber plug (2), The side of the gasket flange (42) is close to the inner wall of the vertical section (11), and the bottom of the vertical section (11) is provided with a radially inwardly protruding support member (111) to support the Bottom surface of gasket flange (42). 3 . The positive pressure joint for needle-free drug dosing infusion according to claim 2 , characterized in that: the gasket flange ( 42 ) is provided with a decompression notch ( 421 ). 4 . 4. A positive pressure connector for needle-free drug dosing infusion according to claim 2, characterized in that: the middle part of the hollow rubber plug (2) is provided with a rubber plug located on the outer wall of the hollow rubber plug (2) A flange (22), the plug flange (22) clings to the inner wall of the vertical section (11), and separates the vertical section (11) from the horizontal section (12). 5. A positive pressure connector for needle-free medicated infusion according to any one of claims 1 to 4, characterized in that: the inner core (3) of the rubber plug includes the inner wall of the hollow rubber plug (2). The fixed inner core body (31) and the inner core flange (32) at the top of the inner core body (31) are plugged and fixed, and the bottom surface of the inner core flange (32) is connected to the hollow rubber plug (2 ) is fixed on the top surface. 6 . The positive pressure connector for needle-free medicated infusion according to claim 5 , characterized in that: a liquid inlet ( 33 ) is provided at the center of the top surface of the inner core ( 3 ) of the rubber plug. 6 . 7. A positive pressure connector for needle-free drug dosing infusion according to any one of claims 1 to 4, characterized in that: a screw cap (5) is sleeved on the outer wall of the upper part of the vertical section (11) . 8. A positive pressure connector for needle-free drug dosing infusion according to any one of claims 1 to 4, characterized in that: a screw socket (61) is sleeved on the outer wall of the horizontal section (12), so that An inner screw cap (62) is sleeved between the screw port (61) and the radial direction of the horizontal section (12). 9. The positive pressure joint for needle-free medicated infusion infusion according to any one of claims 1 to 4, characterized in that: both the shell (1) and the hollow gasket (4) are transparent. 10. A positive pressure connector for needle-free medicated infusion according to claim 9, characterized in that: both the shell (1) and the hollow spacer (4) are made of medical polycarbonate, so The inner core (3) of the rubber plug is made of medical polyoxymethylene, and the hollow rubber plug (2) is made of medical silica gel.

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