A double-layer sealed zero-pressure needle-free dosing connector

Abstract

The present invention discloses a double-layer sealed zero-pressure needle-free drug-adding connector, including an outer shell, an elastic seal, a one-way seal and a screw base, wherein the bottom end of the outer shell is provided with an annular connector snap-in groove; the upper end of the screw base is inserted into the connector snap-in groove; the elastic seal is arranged in the outer shell, and the interior of the elastic seal is hollow; the bottom end face of the elastic seal is provided with an annular snap-in groove and a downwardly protruding convex column; the one-way seal is in a conical shape, and the one-way seal is arranged in the screw base; the inner cavity of the one-way seal is a conical cavity, and a slit is provided at the bottom end of the one-way seal; the bottom end face of the elastic seal is pressed against the top end face of the one-way seal, and the convex column is tightly inserted into the inner cavity of the one-way seal. The double-layer sealed zero-pressure needle-free drug-adding connector of the present invention can avoid the generation of pressure at the end of infusion and improve the comfort of infusion for patients.

Description

Technical Field

[0001] The invention relates to a double-layer sealed zero-pressure needle-free drug-adding joint. Background Art

[0002] At present, needle-free infusion connectors are divided into positive pressure connectors and negative pressure connectors. When the syringe is unplugged at the end of infusion, the positive pressure connector will generate positive pressure inside the connector, automatically pushing the liquid in the connecting tube forward to prevent blood from flowing back into the indwelling needle and avoiding the formation of blood clots. When the infusion device is unplugged at the end of infusion, the negative pressure connector will generate negative pressure inside the connector, causing blood in the patient's body to flow back, which will not only scare the patient, but also cause embolism to block the infusion channel in severe cases. Because both positive and negative pressure connectors will generate a certain amount of pressure at the end of infusion, causing the patient's blood vessels to flow in or out of the blood vessels, which can easily cause discomfort to the patient. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a double-layer sealed zero-pressure needle-free drug-adding connector, which can avoid the generation of pressure at the end of infusion and improve the infusion comfort of the patient.

[0004] The technical solution to achieve the above purpose is: a double-layer sealed zero-pressure needle-free dosing connector, including a shell, an elastic seal, a one-way seal and a screw base, wherein:

[0005] The bottom end of the shell is provided with an annular joint clamping groove;

[0006] The upper end of the screw base is inserted into the connector clamping groove;

[0007] The elastic sealing member is arranged in the housing, and the interior of the elastic sealing member is hollow;

[0008] The bottom end surface of the elastic seal is provided with an annular groove and a downwardly protruding column, the column and the groove are coaxially arranged from inside to outside, and the column is in a conical shape;

[0009] The one-way seal is in a conical shape and is arranged in the screw base;

[0010] The inner cavity of the one-way seal is a conical cavity, and a slit is provided at the bottom end of the one-way seal;

[0011] The bottom end surface of the elastic seal is pressed against the top end surface of the one-way seal, and the protruding column is tightly inserted into the inner cavity of the one-way seal.

[0012] The above-mentioned double-layer sealed zero-pressure needle-free dosing connector, wherein the inner cavity of the screw base includes a first cylindrical cavity, a conical cavity and a second cylindrical cavity connected in sequence from top to bottom, and the outer side of the top end of the one-way seal is folded downward to form a flange; a flange clamping groove is provided on the wall surface of the conical cavity; the one-way seal is tightly inserted in the conical cavity, and the flange is clamped in the flange clamping groove.

[0013] The above-mentioned double-layer sealed zero-pressure needle-free drug-adding connector, wherein a boss is provided at the connection between the first cylindrical cavity and the conical cavity; the lower part of the elastic seal is located in the first cylindrical cavity, and the boss is clamped in the clamping groove.

[0014] The above-mentioned double-layer sealed zero-pressure needle-free drug-adding connector, wherein the angle of the protrusion is 55 to 135°; the angle of the inner cavity of the one-way seal is 50 to 125°; and the angle of the protrusion is 5 to 10° greater than the angle of the inner cavity of the one-way seal.

[0015] The above-mentioned double-layer sealed zero-pressure needle-free dosing connector, wherein the Shore A hardness of the protruding column is 45-65; the Shore A hardness of the one-way seal is 35-55, and the Shore A hardness of the protruding column is 10-20 greater than the Shore A hardness of the one-way seal.

[0016] In the above-mentioned double-layer sealed zero-pressure needle-free drug-adding connector, the slit at the bottom end of the one-way seal is a cross slit or a straight slit.

[0017] In the above-mentioned double-layer sealed zero-pressure needle-free drug-adding connector, a sealing slit is provided at the top end of the elastic sealing member.

[0018] In the above-mentioned double-layer sealed zero-pressure needle-free drug-adding connector, the top end surface of the screw base and the bottom of the connector clamping groove are bonded together by ultrasonic welding.

[0019] The double-layer sealed zero-pressure needle-free drug-adding connector of the present invention can avoid the generation of pressure at the end of infusion, thereby improving the infusion comfort of the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural diagram of the double-layer sealed zero-pressure needle-free drug-adding connector of the present invention;

[0021] Figure 2 It is a cross-sectional view of the double-layer sealed zero-pressure needle-free dosing connector of the present invention;

[0022] Figure 3 It is an exploded structural diagram of the double-layer sealed zero-pressure needle-free dosing connector of the present invention;

[0023] Figure 4It is a three-dimensional structural diagram of the elastic seal;

[0024] Figure 5 is a front view of the elastic seal;

[0025] Figure 6 This is the external structure diagram of the one-way seal;

[0026] Figure 7 It is a structural schematic diagram of a straight-cut slit of a one-way seal;

[0027] Figure 8 It is a schematic diagram of the structure of the cross cut of the one-way seal. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the specific implementation methods thereof are described in detail below in conjunction with the accompanying drawings:

[0029] See also Figures 1 to 8 The best embodiment of the present invention is a double-layer sealed zero-pressure needle-free dosing connector, comprising a shell 1, an elastic seal 2, a one-way seal 4 and a screw base 5.

[0030] An annular joint engaging groove 11 is formed at the bottom of the housing 1 , the upper end of the screw base 5 is inserted into the joint engaging groove 11 , and the top surface of the screw base 5 and the bottom of the joint engaging groove 11 are bonded together by ultrasonic welding.

[0031] The elastic seal 2 is disposed in the housing 1; the interior of the elastic seal 2 is hollow; a sealing slit 23 is provided at the top of the elastic seal 2 (see Figure 4 ), which can effectively prevent bacteria from entering the liquid channel.

[0032] The bottom end surface of the elastic seal 2 is provided with an annular groove 21 and a downwardly protruding column 22 (see Figure 5 ), the boss 22 and the slot 21 are coaxially arranged from the inside to the outside, and the boss 22 is conical; the one-way seal 4 is conical, and the one-way seal 4 is arranged in the screw base 5.

[0033] The inner cavity of the screw base 5 includes a first cylindrical cavity 51, a conical cavity 52 and a second cylindrical cavity 53 connected in sequence from top to bottom. The outer side of the top of the one-way seal 4 is folded downward to form a flange 41; a flange clamping groove 54 is provided on the wall surface of the conical cavity 52; the one-way seal 4 is tightly inserted into the conical cavity 52, and the flange 41 is clamped into the flange clamping groove 54. A boss 55 is provided at the connection between the first cylindrical cavity 51 and the conical cavity 52, the lower part of the elastic seal 2 is located in the first cylindrical cavity 51, and the boss 55 is clamped into the clamping groove 21.

[0034] The inner cavity of the one-way seal 4 is a conical cavity, and a slit 42 is provided at the bottom end of the one-way seal 4; the slit 42 is a cross slit (see Figure 8 ) or straight cut (see Figure 7 The bottom end surface of the elastic seal 2 is pressed against the top end surface of the one-way seal 4 to prevent the one-way seal 4 from rotating and keep the entire system in a sealed state. The protrusion 22 is tightly inserted into the inner cavity of the one-way seal 4.

[0035] The angle of the protrusion 22 is 55-135°; the angle of the inner cavity of the one-way seal 4 is 50-125°; and the angle of the protrusion 22 is 5-10° greater than the angle of the inner cavity of the one-way seal 4. In this way, the protrusion 22 of the elastic seal 2 can better and more smoothly fit the inclined surface of the inner cavity of the one-way seal 4 during the downward movement, so that the cross or straight slit of the one-way seal 4 is perfectly opened.

[0036] The Shore A hardness of the protruding column 22 is 45-65, the Shore A hardness of the one-way seal 4 is 35-55, and the Shore A hardness of the protruding column 22 is 10-20 greater than the Shore A hardness of the one-way seal 4. In this way, the protruding column 22 of the elastic seal 2 can further smoothly open the cross or straight slit of the one-way seal 4 during the downward movement.

[0037] The double-layer sealed zero-pressure needle-free dosing connector of the present invention, when in use, when the interface end is connected to an infusion device, the elastic seal 2 will be squeezed and moved downward, so that the protruding column 22 will open the cross or straight slit of the one-way seal 4 downward, and the inner cavity of the elastic seal 2 is connected with the inner cavity of the screw base 5, so that the liquid inner channel is opened; when the infusion device is disconnected, the elastic seal 2 rebounds, the protruding column 22 moves upward, and the cross or straight slit of the one-way seal 4 is naturally closed to block the liquid passage. During the whole process, the inner channel is almost in a zero-pressure state, and no liquid reflux and pressure difference phenomenon will occur.

[0038] In summary, the double-layer sealed zero-pressure needle-free drug-adding connector of the present invention can avoid the generation of pressure at the end of infusion and improve the infusion comfort of the patient through the coordinated use of the elastic seal and the one-way seal.

[0039] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A double-layer sealed zero-pressure needle-free dosing connector, characterized in that: It includes a housing, an elastic seal, a one-way seal and a screw base, wherein: The bottom end of the shell is provided with an annular joint clamping groove; The upper end of the screw base is inserted into the connector clamping groove; The elastic sealing member is arranged in the housing, and the interior of the elastic sealing member is hollow; The bottom end surface of the elastic seal is provided with an annular groove and a downwardly protruding column, the column and the groove are coaxially arranged from inside to outside, and the column is in a conical shape; The one-way seal is in a conical shape and is arranged in the screw base; The inner cavity of the one-way seal is a conical cavity, and a slit is provided at the bottom end of the one-way seal; The bottom end surface of the elastic seal is pressed against the top end surface of the one-way seal, and the protrusion is tightly inserted into the inner cavity of the one-way seal; The top end of the elastic sealing member is provided with a sealing slit.

2. A double-layer sealed zero-pressure needle-free dosing connector according to claim 1, characterized in that: The inner cavity of the screw base includes a first cylindrical cavity, a conical cavity and a second cylindrical cavity which are connected in sequence from top to bottom. The outer side of the top end of the one-way seal is folded downward to form a flange; a flange clamping groove is provided on the wall surface of the conical cavity; the one-way seal is tightly inserted into the conical cavity, and the flange is clamped in the flange clamping groove.

3. A double-layer sealed zero-pressure needle-free dosing connector according to claim 2, characterized in that: A boss is provided at the connection between the first cylindrical cavity and the conical cavity; the lower part of the elastic sealing component is located in the first cylindrical cavity, and the boss is clamped in the clamping groove.

4. A double-layer sealed zero-pressure needle-free dosing connector according to claim 1, characterized in that: The angle of the protruding column is 55-135°; the angle of the inner cavity of the one-way seal is 50-125°; and the angle of the protruding column is 5-10° greater than the angle of the inner cavity of the one-way seal.

5. The double-layer sealed zero-pressure needle-free dosing connector according to claim 1, characterized in that: The Shore A hardness of the protruding column is 45-65; the Shore A hardness of the one-way sealing component is 35-55, and the Shore A hardness of the protruding column is 10-20 greater than the Shore A hardness of the one-way sealing component.

6. A double-layer sealed zero-pressure needle-free dosing connector according to claim 1, characterized in that: The slit at the bottom end of the one-way seal is a cross slit or a straight slit.

7. A double-layer sealed zero-pressure needle-free dosing connector according to claim 1, characterized in that: The top end surface of the screw base and the bottom of the joint clamping groove are bonded together by ultrasonic welding.

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