Anti-backflow remaining needle

Abstract

An anti-backflow remaining needle comprises a three-way connector, a hose, a catheter seat assembly and a puncture assembly, the three-way connector, the hose and the catheter seat assembly are sequentially connected, the puncture assembly penetrates through the catheter seat assembly, and the catheter seat assembly comprises a first seat body, a second seat body and an elastic one-way valve clamped between the first seat body and the second seat body. The first seat body and the second seat body are connected together in an ultrasonic welding mode or a glue bonding mode; a guide pipe is mounted in one end, back on to the second seat body, of the first seat body through a metal wedge; an isolation plug is arranged in the second seat body, and the puncture assembly sequentially penetrates through the second seat body, the isolation plug, the elastic one-way valve, the first seat body and the catheter; the hose is connected with the side wall of the second seat body, and the joint is located between the elastic one-way valve and the isolation plug. The elastic one-way valve is clamped between the first seat body and the second seat body, and the first seat body and the second seat body are connected together in an ultrasonic welding mode or a glue bonding mode, so that automatic assembly is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of indwelling needle technology, specifically to an anti-backflow indwelling needle. Background Technology

[0002] Currently, anti-backflow indwelling needles on the market mainly achieve the anti-backflow effect through a one-way valve. However, the one-way valve is located inside the catheter seat, which hinders automated assembly, resulting in low assembly precision and consequently a low product yield. Utility Model Content

[0003] Therefore, the purpose of this utility model is to provide an anti-backflow indwelling needle that facilitates automated assembly.

[0004] An anti-backflow indwelling needle includes a three-way connector, a tubing and a catheter seat assembly connected in sequence, and a puncture assembly penetrating the catheter seat assembly. The catheter seat assembly includes a first seat body, a second seat body, and an elastic one-way valve sandwiched between the first seat body and the second seat body. The first seat body and the second seat body are connected together by ultrasonic welding or adhesive bonding.

[0005] A conduit is installed in the end of the first seat body facing away from the second seat body via a metal wedge;

[0006] The second seat is provided with an isolation plug, and the puncture assembly passes through the second seat, the isolation plug, the elastic one-way valve, the first seat and the catheter in sequence;

[0007] The hose is connected to the side wall of the second seat, and the connection is located between the elastic one-way valve and the isolation plug.

[0008] Preferably, the resilient one-way valve has a spherical structure, including a sealing ring sandwiched between the first seat and the second seat, and a hollow sphere connected to the inner ring of the sealing ring;

[0009] The hollow sphere has a cut at the bottom of its inner cavity, and the surface of the cut is coated with silicone oil. The puncture component passes through the cut.

[0010] Preferably, the cut is a straight line, a herringbone shape, a cross shape, or a T-shaped structure.

[0011] Preferably, the elastic one-way valve has a planar circular structure with a cut in the middle. The surface of the cut is coated with silicone oil, and the puncture component passes through the cut.

[0012] Preferably, the cut is a straight line, a herringbone shape, a cross shape, or a T-shaped structure.

[0013] Preferably, the elastic one-way valve has a duckbill-shaped structure, including a sealing ring sandwiched between the first seat and the second seat, a cylindrical ring connected to the inner ring of the sealing ring, and two ramp surfaces connected to the other end of the cylindrical ring.

[0014] A cut is provided at the junction of the two slopes, the surface of which is coated with silicone oil, and the puncture component passes through the cut.

[0015] Preferably, the slope angle of the slope is 20° to 70°.

[0016] Preferably, the elastic one-way valve has a manhole cover-shaped structure, including a sealing ring sandwiched between the first seat and the second seat, a cylindrical ring connected to the inner ring of the sealing ring, and a manhole cover connected to the other end of the cylindrical ring.

[0017] The surface of the manhole cover is coated with silicone oil, and the puncture assembly opens the manhole cover.

[0018] Preferably, 1 / 8 to 1 / 4 of the area of ​​the manhole cover is connected to the cylindrical ring, and when the manhole cover is closed, the manhole cover and the cylindrical ring close to form a sealed structure.

[0019] Preferably, the first seat body has an annular boss on its end face near the second seat body, and the second seat body has a receiving groove on its end face near the first seat body. The annular boss presses the elastic one-way valve into the receiving groove.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] By clamping the elastic one-way valve between the first seat and the second seat, and connecting the first seat and the second seat together by ultrasonic welding or adhesive bonding, automated assembly is facilitated. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the anti-backflow indwelling needle in this utility model;

[0023] Figure 2 for Figure 1 Assembly diagram of the central catheter hub assembly and puncture assembly;

[0024] Figure 3 for Figure 1 Schematic diagram of the middle guide tube seat assembly;

[0025] Figure 4 This is a schematic diagram of the structure of the elastic check valve as a ball in one embodiment of the present invention;

[0026] Figure 5This is a schematic diagram of the planar structure of the elastic check valve in one embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of the elastic one-way valve in one embodiment of the present invention, which is a duckbill-shaped structure;

[0028] Figure 7 This is a schematic diagram of the structure of the elastic one-way valve in one embodiment of the present invention, which is a manhole cover-shaped structure;

[0029] Figure 8 This is a schematic diagram of the assembly process of the anti-backflow indwelling needle in this utility model.

[0030] Explanation of key component symbols:

[0031] 11-Tee connector; 12-Hose;

[0032] 13-Conduit seat assembly; 131-First seat body; 132-Second seat body; 133-Resilient check valve; 1331-Sealing ring; 1332-Hollow sphere; 1333-Slit; 133a-Resilient check valve; 133a1-Slit; 133b-Resilient check valve; 133b1-Sealing ring; 133b2-Cylindrical ring; 133b3-Chamfer; 133b4-Slit; 133c-Resilient check valve; 133c1-Sealing ring; 133c2-Cylindrical ring; 133c3-Well cover; 134-Metal wedge; 135-Conduit; 136-Isolation plug;

[0033] 14-Puncture assembly; 141-Puncture needle; 142-Needle handle.

[0034] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0035] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0036] Please see Figure 1 system Figure 3 An anti-backflow indwelling needle provided in one embodiment of the present invention includes a three-way connector 11, a flexible tube 12 and a catheter seat assembly 13 connected in sequence, and a puncture assembly 14 penetrating the catheter seat assembly 13. The catheter seat assembly 13 includes a first seat body 131, a second seat body 132, and an elastic one-way valve 133 sandwiched between the first seat body 131 and the second seat body 132. The first seat body 131 and the second seat body 132 are connected together by ultrasonic welding or adhesive bonding.

[0037] A conduit 135 is installed in the end of the first seat 131 facing away from the second seat 132 via a metal wedge 134;

[0038] The second seat 132 is provided with an isolation plug 136, and the puncture assembly 14 passes through the second seat 132, the isolation plug 136, the elastic one-way valve 133, the first seat 131 and the catheter 135 in sequence.

[0039] The hose 12 is connected to the side wall of the second seat 132, and the connection is located between the elastic one-way valve 133 and the isolation plug 136.

[0040] It should be noted that when the puncture is completed and intravenous infusion is initiated, the elastic one-way valve 133 ensures that the medication can only flow forward through the catheter seat assembly 13, and cannot flow backward, or the venous pressure is insufficient to break through the elastic one-way valve 133 to allow reverse flow, thus achieving the anti-backflow function. Specifically, the elastic one-way valve 133 is sandwiched between the first seat body 131 and the second seat body 132, and the first seat body 131 and the second seat body 132 are connected together by ultrasonic welding or adhesive bonding, thereby facilitating automated assembly.

[0041] Please see Figure 3 and Figure 4 In a preferred embodiment of the present invention, the elastic one-way valve is a spherical structure, including a sealing ring 1331 sandwiched between the first seat 131 and the second seat 132, and a hollow sphere 1332 connected to the inner ring of the sealing ring 1331.

[0042] The hollow sphere 1332 has a cut 1333 at the bottom of its inner cavity. The surface of the cut 1333 is coated with silicone oil, and the puncture component 14 passes through the cut 1333.

[0043] It should be noted that in this embodiment, the incision 1333 is closed in its natural state. The applied silicone oil prevents the incision 1333 from sticking together and simultaneously increases the sealing performance of the incision 1333. During assembly, the front end of the puncture assembly 14 opens the incision 1333 and passes through the first seat 131, the metal wedge 134, and the catheter 135. When the puncture is completed and infusion is performed, the incision 1333 is sealed, so that the medication can only flow forward through the catheter seat assembly 13 and cannot flow backward, or the venous pressure of the human body is insufficient to break through the elastic one-way valve 133 and flow backward, thereby achieving the function of preventing backflow.

[0044] Preferably, in this embodiment, the cut 1333 is a straight line, herringbone, cross, or T-shaped structure.

[0045] Please see Figure 3 and Figure 5 In a preferred embodiment of the present invention, the elastic one-way valve 133a has a planar circular structure and a cut 133a1 in the middle part. The surface of the cut 133a1 is coated with silicone oil, and the piercing component 14 passes through the cut 133a1.

[0046] It should be noted that in this embodiment, the incision 133a1 is closed in its natural state. The applied silicone oil prevents the incision 133a1 from sticking together and simultaneously increases its sealing performance. During assembly, the front end of the puncture assembly 14 opens the incision 133a1 and passes through the first seat 131, the metal wedge 134, and the catheter 135. When the puncture is completed and infusion is performed, the incision 133a1 is sealed, allowing the medication to flow only forward through the catheter seat assembly 13 and preventing it from flowing backward, or preventing the body's venous pressure from breaking through the elastic one-way valve 133a to flow backward, thus achieving the function of preventing backflow.

[0047] Preferably, in this embodiment, the cut 133a1 is a straight line, herringbone, cross, or T-shaped structure.

[0048] Please see Figure 3 and Figure 6 In a preferred embodiment of the present invention, the elastic one-way valve 133b has a duckbill-shaped structure, including a sealing ring 133b1 sandwiched between the first seat 131 and the second seat 132, a cylindrical ring 133b2 connected to the inner ring of the sealing ring 133b1, and two inclined surfaces 133b3 connected to the other end of the cylindrical ring 133b2.

[0049] A cut 133b4 is provided at the connection of the two slope surfaces 133b3. The surface of the cut 133b4 is coated with silicone oil, and the piercing component 14 passes through the cut 133b4.

[0050] It should be noted that in this embodiment, the incision 133b4 is closed in its natural state. The applied silicone oil prevents the incision 133b4 from sticking together and simultaneously increases its sealing performance. During assembly, the front end of the puncture assembly 14 opens the incision 133b4 and passes through the first seat, the metal wedge 134, and the catheter 135. When the puncture is completed and infusion is performed, the incision 133b4 is sealed, allowing the medication to flow only forward through the catheter seat assembly 13 and preventing it from flowing backward, or preventing the body's venous pressure from breaking through the elastic one-way valve 133b to flow backward, thus achieving the function of preventing backflow.

[0051] Preferably, in this embodiment, the slope angle of the slope surface 133b3 is 20°~70° to enhance its elastic recovery force.

[0052] Please see Figure 3 and Figure 7 In a preferred embodiment of the present invention, the elastic one-way valve 133c has a manhole cover-shaped structure, including a sealing ring 133c1 sandwiched between the first seat 131 and the second seat 132, a cylindrical ring 133c2 connected to the inner ring of the sealing ring 133c1, and a manhole cover 133c3 connected to the other end of the cylindrical ring 133c2.

[0053] The surface of the manhole cover 133c3 is coated with silicone oil, and the puncture component 14 opens the manhole cover 133c3.

[0054] It should be noted that in this embodiment, the manhole cover 133c3 is closed in its natural state. The applied silicone oil prevents the manhole cover 133c3 from sticking together and simultaneously increases its sealing performance. During assembly, the front end of the puncture assembly 14 opens the manhole cover 133c3 and passes it through the first seat 131, the metal wedge 134, and the catheter 135. When the puncture is completed and infusion is performed, the manhole cover 133c3 is sealed, allowing the medication to flow only forward through the catheter seat assembly 13 and preventing it from flowing backward, or preventing the body's venous pressure from being insufficient to break through the elastic one-way valve 133c and flow backward, thus achieving the function of preventing backflow.

[0055] Preferably, in this embodiment, 1 / 8 to 1 / 4 of the area of ​​the manhole cover 133c3 is connected to the cylindrical ring 133c2. When the manhole cover 133c3 is closed, the manhole cover 133c3 and the cylindrical ring 133c2 are closed to form a sealing structure.

[0056] Please see Figure 3 In a preferred embodiment of the present invention, the first seat 131 is provided with an annular boss on the end face near the second seat 132, and the second seat 132 is provided with a receiving groove on the end face near the first seat 131. The annular boss presses the elastic one-way valve 133 into the receiving groove.

[0057] Please see Figure 8 The assembly steps of the anti-backflow indwelling needle in this utility model include:

[0058] Step S11: Assemble the conduit 135 and the metal wedge 134, and then insert them into the first seat 131 to form the first assembly.

[0059] Step S12: The elastic one-way valve 133 is installed into the second seat 132 to form the second assembly, and then connected to the first assembly by ultrasonic welding or glue bonding to form the conduit seat assembly 13.

[0060] Step S13: Press the puncture needle 141 into the needle handle 142 to form the puncture assembly 14, and then install the isolation plug 136 onto the puncture needle 141 to form the third assembly.

[0061] Step S14: Install the catheter seat assembly 13 onto the third assembly and then connect it to the hose 12 equipped with the tee connector 11 to form an anti-backflow indwelling needle.

[0062] In summary, the beneficial effects of this utility model are as follows:

[0063] By clamping the elastic one-way valve 133 between the first seat 131 and the second seat 132, and connecting the first seat 131 and the second seat 132 together by ultrasonic welding or adhesive bonding, automated assembly is facilitated.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An anti-backflow indwelling needle, comprising a tee connector, a tubing, and a catheter seat assembly connected in sequence, and a puncture assembly penetrating the catheter seat assembly, characterized in that: The catheter seat assembly includes a first seat body, a second seat body, and an elastic one-way valve sandwiched between the first seat body and the second seat body. The first seat body and the second seat body are connected together by ultrasonic welding or adhesive bonding. A conduit is installed in the end of the first seat body facing away from the second seat body via a metal wedge; The second seat is provided with an isolation plug, and the puncture assembly passes through the second seat, the isolation plug, the elastic one-way valve, the first seat and the catheter in sequence; The hose is connected to the side wall of the second seat, and the connection is located between the elastic one-way valve and the isolation plug.

2. The anti-backflow indwelling needle according to claim 1, characterized in that, The elastic one-way valve has a spherical structure, including a sealing ring sandwiched between the first seat and the second seat, and a hollow sphere connected to the inner ring of the sealing ring. The hollow sphere has a cut at the bottom of its inner cavity, and the surface of the cut is coated with silicone oil. The puncture component passes through the cut.

3. The anti-backflow indwelling needle according to claim 2, characterized in that, The cut can be in the form of a straight line, a herringbone, a cross, or a T-shape.

4. The anti-backflow indwelling needle according to claim 1, characterized in that, The elastic one-way valve has a planar circular structure with a cut in the middle. The surface of the cut is coated with silicone oil, and the puncture component passes through the cut.

5. The anti-backflow indwelling needle according to claim 4, characterized in that, The cut can be in the form of a straight line, a herringbone, a cross, or a T-shape.

6. The anti-backflow indwelling needle according to claim 1, characterized in that, The elastic one-way valve has a duckbill-shaped structure, including a sealing ring sandwiched between the first seat and the second seat, a cylindrical ring connected to the inner ring of the sealing ring, and two ramp surfaces connected to the other end of the cylindrical ring. A cut is provided at the junction of the two slopes, the surface of which is coated with silicone oil, and the puncture component passes through the cut.

7. The anti-backflow indwelling needle according to claim 6, characterized in that, The slope angle of the slope is 20° to 70°.

8. The anti-backflow indwelling needle according to claim 1, characterized in that, The elastic one-way valve has a manhole cover-shaped structure, including a sealing ring sandwiched between the first seat and the second seat, a cylindrical ring connected to the inner ring of the sealing ring, and a manhole cover connected to the other end of the cylindrical ring. The surface of the manhole cover is coated with silicone oil, and the puncture assembly opens the manhole cover.

9. The anti-backflow indwelling needle according to claim 8, characterized in that, One-eighth to one-quarter of the area of ​​the manhole cover is connected to the cylindrical ring. When the manhole cover is closed, the manhole cover and the cylindrical ring are closed to form a sealed structure.

10. The anti-backflow indwelling needle according to any one of claims 1 to 9, characterized in that, The first seat has an annular boss on its end face near the second seat, and the second seat has a receiving groove on its end face near the first seat. The annular boss presses the elastic one-way valve into the receiving groove.

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