Hemostatic indwelling needle

Abstract

Disclosed is a hemostatic indwelling needle, comprising: a catheter hub (1), a head end of the catheter hub (1) being provided with a catheter (11), a tail end of the catheter hub (1) being provided with an opening, a first cavity (12) being formed in the interior of the catheter hub (1), and the first cavity (12) being provided with a sealing plug (13) and a spring (14); a connection hub (2) assembled at the tail end of the catheter hub (1), a second cavity (21) being formed in the interior of the connector hub (2), and the second cavity (21) being provided with a support (23); a needle hub (3), the needle hub (3) being provided with a needle tube (31). In a puncture state, the connection hub (2) is connected to the needle hub (3), and the needle tube (31) pierces through the sealing plug (13) and then extends into the catheter (11); in a needle withdrawal state, the connection hub (2) separates from the needle hub (3), the needle tube (31) withdraws from the catheter (11) and the sealing plug (13), and the sealing plug (13) is pressed by the spring (14) and seal a port of the connection hub (2), thereby separating the first cavity (12) from the second cavity (21); in an infusion state, the connection hub (2) is connected to a syringe, a connector of the syringe pushes the support (23) out of the connection hub (2), and the support (23) overcomes an elastic force of the spring (14) to push open the sealing plug (13), enabling communication between the first cavity (12) and the second cavity (21).

Description

Blood-blocking catheter

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 14, 2023, with application number 202311517007.6, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of medical devices, for example, to a blood-blocking indwelling needle. Background Art

[0003] An intravenous catheter is an infusion tool, which is usually composed of a stainless steel needle core, a soft outer cannula and a plastic needle seat. During puncture, the outer cannula and the needle core are inserted into the blood vessel together, and then the needle core is pulled out, leaving the outer cannula in the blood vessel. For patients who receive long-term infusion or intermittent or continuous infusion, the use of an intravenous catheter can avoid the damage and complications caused by repeated punctures, so it is widely used in clinical practice.

[0004] Considering the risk of accidental contact with the needle tip after the puncture needle is withdrawn, which could potentially cause infection to outsiders, some indwelling needles have added a needle tip protection component. When the needle is withdrawn, the needle tip protection component wraps around the needle tip and is removed along with the needle core, thus shielding the needle tip. However, the cavity where the existing needle tip protection component is located is connected to the puncture site in the human body. As a result, when the needle is withdrawn, the removed needle tip protection component becomes contaminated with the patient's blood, which can easily lead to bacterial spillage and infectious diseases. Improvements are urgently needed.

[0005] Summary of the Invention

[0006] The present application provides a blood-blocking indwelling needle that isolates the needle tip protection component inside the indwelling needle from the blood, thereby preventing blood from overflowing from the patient and reducing the risk of infection.

[0007] The syringe has a first end for injecting the first and second cavities, and the second end for injecting the second cavities is injected into the syringe barrel, and the syringe barrel has a first end for injecting the first and second cavities, and the syringe barrel has a second end for injecting the second cavities.

[0008] Optionally, the sealing plug is made of silicone, and a gap is left between the edge of the sealing plug and the inner wall of the catheter seat.

[0009] Optionally, the spring is made of a plastic material that is not prone to blood coagulation.

[0010] Optionally, in the needle-retracted state, the bracket limits the sealing plug.

[0011] Optionally, the bracket includes an end plate and a support arm extending axially from the edge of the end plate, the end plate is flush with the port of the connecting seat, and a avoidance hole is provided on the end plate to allow the needle tube to pass through, and a positioning groove for installing the support arm is provided on the inner wall of the connecting seat.

[0012] Optionally, a flange is provided in the middle of the outer surface of the connecting seat, and the flange is ultrasonically welded to the tail end port of the catheter seat. The port of the connecting seat is inserted into the tail end of the catheter seat to form a contact surface that cooperates with the sealing plug.

[0013] Optionally, a needle tip protection buckle is provided in the second cavity, and the needle tip protection buckle is buckled on the needle tube to wrap the needle tip of the needle tube when the needle is withdrawn.

[0014] Optionally, a stop step for axially limiting the needle tip protection buckle is provided on the needle seat.

[0015] Optionally, the head end of the needle seat is provided with a protrusion that cooperates and plugs with the connecting seat, and the stop step is formed on the protrusion.

[0016] Optionally, a vent plug is provided at the tail end of the needle seat, and a vent membrane is provided in the vent plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a structural diagram of a blood-blocking indwelling needle provided in an embodiment of the present application;

[0018] FIG2 is an exploded view of the structure of a blood-blocking indwelling needle provided in an embodiment of the present application;

[0019] FIG3 is a cross-sectional view of the structure of the blood-blocking indwelling needle provided in an embodiment of the present application.

[0020] In the figure: 1. Catheter seat; 11. Catheter; 12. First cavity; 13. Sealing plug; 14. Spring; 2. Connecting seat; 21. Second cavity; 22. Flange; 23. Bracket; 231. End plate; 232. Support arm; 233. Avoidance hole; 24. Positioning groove; 25. Needle tip protection buckle; 3. Needle seat; 31. Needle tube; 32. Raised portion; 33. Stop step; 4. Vent plug; 41. Vent membrane. DETAILED DESCRIPTION

[0021] The following describes embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0022] In the description of this application, unless otherwise expressly specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to a fixed connection, a detachable connection, a mechanical connection, an electrical connection, an indirect connection through an intermediate medium, or internal communication between two elements or an interaction between two elements. A person of ordinary skill in the art will be able to understand the meaning of the above terms in this application according to the circumstances.

[0023] In the description of the present application, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature being in contact not directly but through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. A first feature being “below”, “below”, and “below” a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature. The technical solution of the present application will be described below with reference to the accompanying drawings and through specific implementation methods.

[0024] Referring to FIG. 1 to FIG. 3 , this embodiment provides a blood blocking indwelling needle, comprising a catheter seat 1 , a connecting seat 2 and a needle seat 3 .

[0025] A catheter 11 is provided at the head end of the catheter hub 1 , and the tail end of the catheter hub 1 is open. A first cavity 12 is formed inside the catheter hub 1 , and a sealing plug 13 and a spring 14 are provided in the first cavity 12 .

[0026] The first cavity 12 here is a chamber connected to the puncture port of the human body, which inevitably retains blood, and the needle tip protection buckle 25 and other components are located behind the first cavity 12. Therefore, blocking the first cavity 12 can directly and effectively prevent blood from overflowing.

[0027] The sealing plug 13 here is made of silicone material, and a gap is left between the edge of the sealing plug 13 and the inner wall of the catheter seat 1. The reason is that the active surface of the sealing plug 13 is on the end surface and needs to move axially; the spring 14 is made of a plastic material that is not easy to coagulate, such as polycarbonate (PC), so that it can operate normally and maintain the top pressure on the sealing plug 13.

[0028] The connecting seat 2 is assembled at the rear end of the catheter seat 1 . A second cavity 21 is formed inside the connecting seat 2 . A bracket 23 is disposed in the second cavity 21 .

[0029] A flange 22 is provided in the middle of the outer surface of connector 2. Flange 22 is ultrasonically welded to the rear end of catheter adapter 1 to ensure a secure connection. The port of connector 2 is inserted into the rear end of catheter adapter 1, forming a contact surface with sealing plug 13. Sealing plug 13 abuts against the port of connector 2, sealing first cavity 12. Bracket 23 here can extend or retract into connector 2, pushing sealing plug 13 against the force of spring 14, thereby unblocking first cavity 12 for infusion.

[0030] The bracket 23 also serves to limit the position of the sealing plug 13 when the needle is withdrawn, preventing excessive pressure on the sealing plug 13, which would otherwise reduce the sealing effect. The bracket 23 comprises an end plate 231 and a support arm 232 extending axially from the edge of the end plate 231. The end plate 231 is flush with the port of the connector 2 and is provided with a clearance hole 233 to allow the needle tube 31 to pass through. The inner wall of the connector 2 is provided with a positioning groove 24 for receiving the support arm 232.

[0031] A needle tube 31 is provided on the needle seat 3, and a needle tip protection buckle 25 is provided in the second cavity 21. The needle tip protection buckle 25 is buckled on the needle tube 31 and is used to wrap the needle tip of the needle tube 31 when the needle is withdrawn. The needle tip protection buckle 25 is an existing protection component, and its structure and principle will not be elaborated on.

[0032] The head end of the needle seat 3 is provided with a protrusion 32 that cooperates with the connecting seat 2 and is plugged into the connecting seat 2. A stop step 33 is formed on the protrusion 32 to limit the axial position of the needle tip protection buckle 25.

[0033] A vent plug 4 is provided at the tail end of the needle seat 3 , and a vent membrane 41 is provided in the vent plug 4 .

[0034] Based on the above structure, in the puncture state, the catheter seat 1, the connecting seat 2, the needle seat 3, and the vent plug 4 are connected in sequence, and the needle tube 31 pierces the sealing plug 13 and extends into the catheter 11 to puncture the blood vessel;

[0035] In the needle withdrawal state, the connector 2 is separated from the needle hub 3, and the needle tube 31 is withdrawn from the catheter 11 and the sealing plug 13. The sealing plug 13 seals the puncture hole of the needle tube 31 due to its own characteristics, and the sealing plug 13 is pressed by the spring 14 and blocks the port of the connector 2, thereby isolating the first cavity 12 from the second cavity 21 and preventing blood from overflowing. At this time, the withdrawn needle tube 31 and the surface of the needle tip protection buckle 25 are almost not stained with blood, which is highly safe.

[0036] In the infusion state, the connecting seat 2 is connected to the syringe, and the connector of the syringe pushes the bracket 23 out of the connecting seat 2. The bracket 23 overcomes the elastic force of the spring 14 and pushes open the sealing plug 13, so that the first cavity 12 is connected to the second cavity 21, thereby ensuring normal infusion.

[0037] In summary, the above-mentioned blood-blocking indwelling needle is designed with an anti-overflow structure. When the needle is withdrawn, the sealing plug and the spring are used to seal the chamber connected to the puncture port of the human body to prevent blood overflow. During infusion, the sealing plug is pushed open by the injection pressure to ensure normal infusion, thereby meeting the use requirements and improving the safety of use.

Claims

1. A blood blocking indwelling needle, comprising: A catheter seat (1), wherein a catheter (11) is arranged at the head end of the catheter seat (1), the tail end of the catheter seat (1) is open, and a first cavity (12) is formed inside the catheter seat (1), and a sealing plug (13) and a spring (14) are arranged in the first cavity (12); A connecting seat (2) is assembled at the rear end of the catheter seat (1), a second cavity (21) is formed inside the connecting seat (2), and a bracket (23) is arranged in the second cavity (21); A needle seat (3), wherein a needle tube (31) is arranged on the needle seat (3); In the puncture state, the connecting seat (2) is connected to the needle seat (3), and the needle tube (31) pierces the sealing plug (13) and then extends into the catheter (11); In the needle withdrawal state, the connecting seat (2) is separated from the needle seat (3), the needle tube (31) is withdrawn from the catheter (11) and the sealing plug (13), and the sealing plug (13) is pressed by the spring (14) and blocks the port of the connecting seat (2), thereby isolating the first cavity (12) from the second cavity (21); In the infusion state, the connecting seat (2) is connected to the syringe, the connector of the syringe pushes the bracket (23) out of the connecting seat (2), and the bracket (23) overcomes the elastic force of the spring (14) to push open the sealing plug (13), so that the first cavity (12) is connected to the second cavity (21).

2. The blood blocking indwelling needle according to claim 1, wherein: The sealing plug (13) is made of silicone material, and a gap is left between the edge of the sealing plug (13) and the inner wall of the catheter seat (1).

3. The blood blocking indwelling needle according to claim 1, wherein: The spring (14) is made of a plastic material that is not easy to coagulate.

4. The blood blocking indwelling needle according to claim 1, wherein: In the needle withdrawal state, the bracket (23) limits the position of the sealing plug (13).

5. The blood blocking indwelling needle according to claim 4, wherein: The bracket (23) comprises an end plate (231) and a support arm (232) extending axially from the edge of the end plate (231); the end plate (231) is flush with the port of the connecting seat (2), and a avoidance hole (233) is provided on the end plate (231) to allow the needle tube (31) to pass through; and a positioning groove (24) for mounting the support arm (232) is provided on the inner wall of the connecting seat (2).

6. The blood blocking indwelling needle according to claim 1, wherein: A flange (22) is provided in the middle of the outer surface of the connecting seat (2), and the flange (22) is ultrasonically welded to the rear end port of the catheter seat (1). The port of the connecting seat (2) is inserted into the rear end of the catheter seat (1) to form a contact surface that cooperates with the sealing plug (13).

7. The blood blocking indwelling needle according to claim 1, wherein: A needle tip protection buckle (25) is provided in the second cavity (21), and the needle tip protection buckle (25) is buckled on the needle tube (31) and is used to wrap the needle tip of the needle tube (31) when the needle is withdrawn.

8. The blood blocking indwelling needle according to claim 7, wherein: The needle seat (3) is provided with a stop step (33) for axially limiting the needle tip protection buckle (25).

9. The blood blocking indwelling needle according to claim 8, wherein: The head end of the needle seat (3) is provided with a protruding portion (32) which is plugged into and matched with the connecting seat (2), and the stop step (33) is formed on the protruding portion (32).

10. The blood blocking indwelling needle according to claim 1, wherein: A vent plug (4) is provided at the rear end of the needle seat (3), and a vent membrane (41) is provided in the vent plug (4).

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