Guiding type zero pressure needle-free drug adding connector

Abstract

The application discloses a guiding type zero-pressure needleless medicine adding connector, which comprises a shell, an elastic sealing element, a central guide column, a one-way sealing element and a screw base, the elastic sealing element is arranged in the shell, the lower half of the inner cavity of the elastic sealing element is a guide column mounting hole, four liquid flow grooves are uniformly distributed on the outer wall surface of the central guide column along the circumferential direction of the central guide column, the central guide column comprises a first cylindrical section, a second cylindrical section and a conical head which are sequentially connected from top to bottom, the central guide column is tightly inserted into the elastic sealing element, the inner cavity of the one-way sealing element is formed by connecting an upper conical cavity and a lower conical cavity, and the outer wall surface of the one-way sealing element is formed by connecting an upper circular arc section and a lower cylindrical section. The guiding type zero-pressure needleless medicine adding connector can avoid generating pressure when the infusion is finished, improve the infusion comfort of patients, has a dead cavity, liquid cannot enter the area, so that the inner cavity volume of the connector is reduced, the direction of the inner channel is maintained vertical and single, and the infusion is smooth.

Description

Technical Field

[0001] The invention relates to a guided zero-pressure needle-free drug-adding connector. Background Art

[0002] The current needle-free infusion connectors are divided into positive pressure connectors and negative pressure connectors. When the syringe is unplugged at the end of the 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 the 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 in severe cases, a thrombus will form to block the infusion channel. Because both the positive pressure connector and the negative pressure connector will generate a certain amount of pressure at the end of the infusion, causing the patient's blood vessels to flow in or out of the fluid, which can easily cause discomfort to the patient. In addition, most traditional connectors use a circular liquid channel, which may cause infusion to be blocked. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a guided zero-pressure needle-free dosing connector, which can avoid the generation of pressure at the end of infusion and improve the patient's infusion comfort. It has a cross-shaped liquid channel to meet the infusion flow rate, and there is a dead space, and the liquid cannot enter this area, thereby reducing the volume of the connector's inner cavity and maintaining the vertical and single direction of the inner channel, which is conducive to smooth infusion.

[0004] The technical solution to achieve the above purpose is: a guided zero-pressure needle-free dosing connector, comprising a housing, an elastic seal, a central guide column, 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, and the top surface of the screw base and the bottom of the connector clamping groove are bonded together by ultrasonic welding;

[0007] The elastic seal is disposed in the housing; the lower half of the inner cavity of the elastic seal is a guide post mounting hole, the guide post mounting hole comprising a first cylindrical hole and a second cylindrical hole connected sequentially from top to bottom, the inner diameter of the first cylindrical hole being smaller than the inner diameter of the second cylindrical hole, and a step surface of the elastic seal is formed at the connection between the first cylindrical hole and the second cylindrical hole;

[0008] The outer wall of the central guide column is evenly distributed along its circumferential direction with four liquid flow grooves, each of which is vertically arranged, and the four liquid flow grooves form a cross-shaped liquid channel;

[0009] The central guide column comprises a first cylindrical section, a second cylindrical section and a conical head connected in sequence from top to bottom; the outer diameter of the first cylindrical section is smaller than the outer diameter of the second cylindrical section, and a guide column step surface is formed at the connection between the first cylindrical section and the second cylindrical section;

[0010] The central guide column is tightly inserted into the elastic seal, the first cylindrical section is located in the first cylindrical hole, the second cylindrical section is located in the second cylindrical hole, and the step surface of the guide column is in contact with the step surface of the elastic seal;

[0011] The inner cavity of the one-way seal is formed by connecting an upper conical cavity and a lower conical cavity, and the upper conical cavity is in a conical shape with a larger upper portion and a smaller lower portion, and the lower conical cavity is in a conical shape with a smaller upper portion and a larger lower portion;

[0012] The outer wall surface of the one-way seal is formed by connecting an upper arc segment and a lower cylindrical segment;

[0013] 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;

[0014] The one-way seal is arranged in the conical cavity of the screw base, and the lower cylindrical section of the one-way seal is tightly fitted with the inner wall surface of the conical cavity, and a dead space is formed between the upper arc section of the one-way seal and the inner wall surface of the conical cavity;

[0015] The bottom end surface of the elastic seal is pressed against the top end surface of the one-way seal, and the conical head of the central guide column is inserted into the upper conical cavity of the one-way seal.

[0016] In the above-mentioned guided zero-pressure needle-free dosing connector, the outer diameter of the central guide column is larger than the inner diameter of the guide column mounting hole of the elastic seal.

[0017] The above-mentioned guided zero-pressure needle-free dosing connector, wherein the top of the outer wall of the one-way seal is provided with a downwardly folded flange; the wall surface of the conical cavity of the screw base is provided with a flange clamping groove; the flange is clamped in the flange clamping groove

[0018] The above-mentioned guided zero-pressure needle-free dosing connector, wherein a boss is provided at the connection between the first cylindrical cavity and the conical cavity, the bottom end surface of the elastic seal is provided with a card groove adapted to the boss, the lower end of the elastic seal is located in the first cylindrical cavity, and the boss is card-engaged in the card groove.

[0019] In the above-mentioned guided zero-pressure needle-free dosing connector, the width of each liquid flow groove is 0.5 to 1.5 mm.

[0020] In the above-mentioned guided zero-pressure needle-free dosing connector, the angle of the conical head of the central guide column is 70-110°, and the angle of the upper conical cavity of the one-way seal is 72-112°.

[0021] The above-mentioned guided zero-pressure needle-free dosing connector, wherein the angle of the conical head of the central guide column is 2 to 5° smaller than the angle of the upper conical cavity of the one-way seal; the maximum outer diameter of the conical head of the central guide column is 1 to 3 mm larger than the maximum inner diameter of the upper conical cavity of the one-way seal.

[0022] The guided zero-pressure needle-free dosing connector of the present invention can avoid the generation of pressure at the end of infusion, improve the patient's infusion comfort, has a cross-shaped liquid channel to meet the infusion flow rate, and has a dead space where liquid cannot enter, thereby reducing the volume of the connector's inner cavity and maintaining a vertical and single direction of the inner channel, which is conducive to smooth infusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a three-dimensional structural diagram of the guided zero-pressure needle-free dosing connector of the present invention;

[0024] Figure 2 It is a cross-sectional view of the guided zero-pressure needle-free dosing connector of the present invention;

[0025] Figure 3 This is an exploded structural diagram of the guided zero-pressure needle-free dosing connector of the present invention;

[0026] Figure 4 Schematic diagram of the three-dimensional structure of the central guide column;

[0027] Figure 5 This is the main view of the center guide column;

[0028] Figure 6 A top view of the center guide column;

[0029] Figure 7 It is a structural diagram of a one-way seal;

[0030] Figure 8 This is a diagram of the initial state of the guided zero-pressure needle-free dosing connector of the present invention;

[0031] Figure 9 for Figure 8 A partial enlarged view of part A;

[0032] Figure 10 This is a diagram of the compressed state of the guided zero-pressure needle-free dosing connector of the present invention;

[0033] Figure 11 for Figure 10 A partial enlarged view of part B. DETAILED DESCRIPTION

[0034] In order to make the skilled in the art better understand the technical solutions of the present application, the specific embodiments thereof will be described in detail below with reference to the accompanying drawings:

[0035] Please refer to Figures 1 to 7 , the best embodiment of the present application, a guide type zero pressure needle-free drug feeding connector, comprising a shell 1, an elastic sealing element 2, a central guide column 3, a one-way sealing element 4 and a screw base 5.

[0036] The bottom end of the shell 1 is provided with an annular connector clamping groove 11; the upper end of the screw base 5 is inserted into the connector clamping groove 11, and the top end face of the screw base 5 and the groove bottom of the connector clamping groove 11 are bonded together by ultrasonic welding.

[0037] The elastic sealing element 2 is arranged in the shell 1. The lower half of the inner cavity of the elastic sealing element 2 is a guide column mounting hole, which comprises a first cylindrical hole 21 and a second cylindrical hole 22 connected in sequence from top to bottom, the inner diameter of the first cylindrical hole 21 is smaller than that of the second cylindrical hole 22, and the connecting part of the first cylindrical hole and the second cylindrical hole forms an elastic sealing element step face 23.

[0038] The outer wall surface of the central guide column 3 is uniformly provided with four liquid flow grooves 31 (see Figure 4 ) along the circumferential direction thereof, each liquid flow groove 31 is vertically arranged, and the four liquid flow grooves 31 form a cross-shaped liquid passage 6 (see Figure 6 ) for liquid flow, the width w of each liquid flow groove 31 is 0.5-1.5mm, which meets the infusion flow rate.

[0039] Please refer to Figure 5 , the central guide column 3 comprises a first cylindrical segment 32, a second cylindrical segment 33 and a conical head 34 connected in sequence from top to bottom; the outer diameter of the first cylindrical segment 32 is smaller than that of the second cylindrical segment 33, and the connecting part of the first cylindrical segment 32 and the second cylindrical segment 32 forms a guide column step face 35.

[0040] Please refer to Figure 2 and Figure 3The center guide column 3 is tightly inserted into the elastic seal 2, the first cylindrical section 32 is located in the first cylindrical hole 21, the second cylindrical section 33 is located in the second cylindrical hole 22, and the guide column step surface 35 is in contact with the elastic seal step surface 23. The outer diameter of the center guide column 3 is larger than the inner diameter of the guide column mounting hole of the elastic seal 2, so that the center guide column 3 can be fastened to the elastic seal 2 and move with the elastic seal 2. The guide column step surface 35 contacts the elastic seal step surface 23, which can act as an upper and lower limit for the center guide column 3, so that the conical head of the center guide column 3 can just cling to the inner wall surface of the one-way seal 3 in the natural state of the joint to form an internal passage disconnection state.

[0041] See also Figure 7 The inner cavity of the one-way seal 4 is formed by connecting an upper conical cavity 41 and a lower conical cavity 42. The upper conical cavity 41 is conical in shape, larger at the top and smaller at the bottom, while the lower conical cavity 42 is conical in shape, smaller at the top and larger at the bottom. The outer wall of the one-way seal 4 is formed by connecting an upper arc segment 43 and a lower cylindrical segment 44. The top end of the outer wall of the one-way seal 4 is provided with a downwardly folded flange 45.

[0042] See also Figure 2 and Figure 3 The inner cavity of the screw base 5 comprises a first cylindrical cavity 51, a conical cavity 52, and a second cylindrical cavity 53, which are connected in sequence from top to bottom. A flanged engaging groove 54 is provided on the wall of the conical cavity 52 of the screw base 5. The one-way seal 4 is disposed within the conical cavity 52 of the screw base 5, with the flange 45 engaging within the flanged engaging groove 54. Furthermore, the lower cylindrical section 44 of the one-way seal 4 fits tightly against the inner wall of the conical cavity 52, while a dead space 7 is formed between the upper arc section 43 of the one-way seal 4 and the inner wall of the conical cavity 52. ​​Liquid cannot enter this area, thereby reducing the volume of the connector's inner cavity and maintaining a vertical and single internal channel, facilitating smooth infusion.

[0043] A boss 55 is provided at the connection between the first cylindrical cavity 51 and the conical cavity 52, and a slot 24 adapted to the boss 55 is provided on the bottom end surface of the elastic seal 2. The lower end of the elastic seal 2 is located in the first cylindrical cavity 51, and the boss 55 is snapped into the slot 24.

[0044] 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 conical head 34 of the central guide column 3 is inserted into the upper conical cavity 41 of the one-way seal 4.

[0045] The angle of the conical head 34 of the center guide column 3 is 70 to 110 degrees, and the angle of the upper conical cavity 41 of the one-way seal 4 is 72 to 112 degrees. The angle of the conical head 34 of the center guide column 3 is 2 to 5 degrees smaller than the angle of the upper conical cavity 41 of the one-way seal 4; the maximum outer diameter of the conical head 34 of the center guide column 3 is 1 to 3 mm larger than the maximum inner diameter of the upper conical cavity 41 of the one-way seal 4, which can ensure that the outer wall surface of the conical head 34 of the center guide column 3 fits tightly with the inner wall surface of the upper conical cavity 41 of the one-way seal 4. The existence of the dead space 7 prevents the outer wall of the one-way seal 4 from contacting the screw base 5 when it is evenly expanded, thereby avoiding the screw base 5 blocking the outer wall of the one-way seal 4 from expanding, allowing the center guide column 3 to move downward smoothly. The wall thickness of the lower conical cavity 42 is thicker at the upper end and thinner at the lower end. This design avoids the lower end being too thick, which causes excessive extrusion pressure and prevents the center guide column 3 from moving downward smoothly. The thick part at the upper end is the stress-bearing part of the entire one-way seal 4. While meeting the natural state and tightly sealing with the center guide column 3, it can also enhance the overall strength of the one-way seal 4 and avoid damage to the one-way seal 4 during multiple downward movements of the center guide column 3.

[0046] See also Figure 8 and Figure 9 In the initial state of the guided zero-pressure needle-free dosing connector of the present invention, the outer wall surface of the conical head 34 of the central guide column 3 is tightly fitted with the inner wall surface of the upper conical cavity 41 of the one-way seal 4, and the internal liquid channel of the connector is in a disconnected state, and the liquid cannot flow.

[0047] See also Figure 10 and Figure 11 The present invention's guided zero-pressure needle-free dosing connector, when in use, when an infusion device is connected to the interface end, is squeezed downward by the elastic seal 2, causing the center guide post 3 to move downward. The lower portion of the conical head 34 of the center guide post 3 enters the lower conical cavity 42 of the one-way seal 4. This opens the cross-shaped liquid channel 6 on the center guide post 3 to connect with the inner cavity of the one-way seal 4, allowing the inner cavity of the elastic seal 2 to connect with the inner cavity of the screw base 5. This opens the liquid inner channel, allowing the liquid to flow from the inner cavity of the elastic seal 2 through the center guide post 3 and into the inner cavity of the screw base 5 through the cross-shaped liquid channel 6, meeting the infusion flow rate. When the infusion device is disconnected, the elastic seal 2 rebounds, and the center guide post 3 moves upward, returning to its initial state, blocking the liquid passage. Throughout the entire process, the inner channel is in a nearly zero-pressure state, preventing liquid backflow and pressure differences.

[0048] In summary, the guided zero-pressure needle-free dosing connector of the present invention, through the coordinated use of elastic seals and one-way seals, can avoid the generation of pressure at the end of infusion, improve the patient's infusion comfort, have a cross-shaped liquid channel to meet the infusion flow rate, and have a dead space where liquid cannot enter, thereby reducing the volume of the connector's inner cavity and maintaining a vertical and single direction of the inner channel, which is conducive to smooth infusion.

[0049] Those skilled in the art should recognize that the above embodiments are merely intended 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 guided zero-pressure needle-free dosing connector, characterized in that: It includes a housing, an elastic seal, a central guide column, 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, and the top surface of the screw base and the bottom of the connector clamping groove are bonded together by ultrasonic welding; The elastic seal is disposed in the housing; the lower half of the inner cavity of the elastic seal is a guide post mounting hole, the guide post mounting hole comprising a first cylindrical hole and a second cylindrical hole connected sequentially from top to bottom, the inner diameter of the first cylindrical hole being smaller than the inner diameter of the second cylindrical hole, and a step surface of the elastic seal is formed at the connection between the first cylindrical hole and the second cylindrical hole; The outer wall of the central guide column is evenly distributed along its circumferential direction with four liquid flow grooves, each of which is vertically arranged, and the four liquid flow grooves form a cross-shaped liquid channel; The central guide column comprises a first cylindrical section, a second cylindrical section and a conical head connected in sequence from top to bottom; the outer diameter of the first cylindrical section is smaller than the outer diameter of the second cylindrical section, and a guide column step surface is formed at the connection between the first cylindrical section and the second cylindrical section; The central guide column is tightly inserted into the elastic seal, the first cylindrical section is located in the first cylindrical hole, the second cylindrical section is located in the second cylindrical hole, and the step surface of the guide column is in contact with the step surface of the elastic seal; The inner cavity of the one-way seal is formed by connecting an upper conical cavity and a lower conical cavity, and the upper conical cavity is in a conical shape with a larger upper portion and a smaller lower portion, and the lower conical cavity is in a conical shape with a smaller upper portion and a larger lower portion; The outer wall surface of the one-way seal is formed by connecting an upper arc segment and a lower cylindrical segment; 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; The one-way seal is arranged in the conical cavity of the screw base, and the lower cylindrical section of the one-way seal is tightly fitted with the inner wall surface of the conical cavity, and a dead space is formed between the upper arc section of the one-way seal and the inner wall surface of the conical cavity; The bottom end surface of the elastic seal is pressed against the top end surface of the one-way seal, and the conical head of the central guide column is inserted into the upper conical cavity of the one-way seal. The outer diameter of the central guide column is larger than the inner diameter of the guide column mounting hole of the elastic seal. The top end of the outer wall of the one-way seal is provided with a downwardly folded flange; the wall surface of the conical cavity of the screw base is provided with a flange clamping groove; the flange is clamped in the flange clamping groove.

2. A guided zero-pressure needle-free dosing connector according to claim 1, characterized in that: A boss is provided at the connection between the first cylindrical cavity and the conical cavity, and a slot adapted to the boss is provided on the bottom end surface of the elastic seal. The lower end of the elastic seal is located in the first cylindrical cavity, and the boss is clamped in the slot.

3. The guided zero-pressure needle-free dosing connector according to claim 1, characterized in that: The width of each liquid flow groove is 0.5 to 1.5 mm.

4. The guided zero-pressure needle-free dosing connector according to claim 1, characterized in that: The angle of the conical head of the central guide column is 70-110 degrees, and the angle of the upper conical cavity of the one-way seal is 72-112 degrees.

5. The guided zero-pressure needle-free dosing connector according to claim 4, characterized in that: The angle of the conical head of the central guide column is 2 to 5 degrees smaller than the angle of the upper conical cavity of the one-way seal; the maximum outer diameter of the conical head of the central guide column is 1 to 3 mm larger than the maximum inner diameter of the upper conical cavity of the one-way seal.

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