Indwelling needle

Abstract

An indwelling needle, comprising a needle seat, a guide tube seat and a needle tip protective shell. A needle is provided on the needle seat; a needle passage and an injection side tube are provided on the guide tube seat; a guide tube is provided at the tail end of the needle passage; a resilient silicone block is provided in the needle passage; a limiting piece and an elastic piece are provided in the needle tip protective shell; a first limiting hole allowing the needle to pass through is formed on the limiting piece; a second limiting hole allowing the needle to pass through is formed on the elastic piece; in the factory state, the needle passes through the first limiting hole and the second limiting hole in the needle tip protective shell, pierces the resilient silicone block and then extends into the guide tube; when the needle is withdrawn, the resilient silicone block seals, by means of the resilience thereof, the hole formed by piercing by the needle, and the elastic piece is deformed by the elasticity thereof, so that the first limiting hole and the second limiting hole are misaligned and the needle passage path is blocked.

Description

Indwelling needle

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 4, 2023, with application number 202310976903.2. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of medical devices, for example, to an 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 hollow cannula and a plastic needle seat. During puncture, the outer hollow cannula and the needle core are inserted into the blood vessel together, and then the needle core is pulled out, leaving the outer hollow 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] Summary of the Invention

[0005] The present application discloses an indwelling needle, comprising a needle seat, a catheter seat and a needle tip protective shell, wherein a needle tube is arranged on the needle seat, an acupuncture channel and an injection side channel are arranged on the catheter seat, and a catheter is arranged at the end of the acupuncture channel, wherein an elastic silicone block is arranged in the acupuncture channel, a limiting plate and an elastic plate are arranged in the needle tip protective shell, a first limiting hole for allowing the needle tube to pass through is opened on the limiting plate, and a second limiting hole for allowing the needle tube to pass through is opened on the elastic plate. In the factory state, the needle tube passes through the first limiting hole and the second limiting hole in the needle tip protective shell, pierces the elastic silicone block and then extends into the catheter; in the needle retracted state, the elastic silicone block relies on the elastic force of the elastic silicone block to seal the puncture hole of the needle tube, and the elastic plate is deformed by the elastic force of the elastic plate, so that the first limiting hole and the second limiting hole are misaligned, and the needle tube passage path is blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] FIG1 is a schematic diagram of the appearance of an indwelling needle provided in an embodiment of the present application;

[0007] FIG2 is an exploded view of an indwelling needle provided in an embodiment of the present application;

[0008] FIG3 is a schematic diagram of an elastic sheet and a limiting sheet installed in a needle tip protective shell of an indwelling needle provided in an embodiment of the present application;

[0009] FIG4 is a schematic diagram of an elastic sheet in an indwelling needle provided in an embodiment of the present application;

[0010] FIG5 is a schematic diagram of a limiting piece in an indwelling needle provided in an embodiment of the present application;

[0011] FIG6 is a schematic diagram of the rear cover of the catheter hub in the indwelling needle provided in an embodiment of the present application.

[0012] In the figure: 1. Needle seat; 11. Needle tube; 12. Slot; 13. Arrow; 2. Catheter seat; 21. Acupuncture channel; 22. Injection side channel; 23. Catheter; 24. Protrusion; 3. Needle tip protection shell; 31. Limit block; 32. Slot; 33. Ridge; 4. Elastic silicone block; 41. Isolation plug; 42. Hollow sleeve; 5. Limit plate; 51. First limiting hole; 6. Elastic plate; 61. Second limiting hole; 62. Fixing part; 63. V-shaped energy storage part; 64. Opening part; 65. Buckle part; 7. Catheter seat back cover; 71. Avoidance port; 8. Cover plate. DETAILED DESCRIPTION

[0013] Most indwelling needles are of the retractable needle type. After the needle core is pulled out, there is a risk of leakage due to the needle hole. In addition, the needle core may be reused, especially after the needle tip has come into contact with the patient's blood, which may cause contact infection to outsiders, leading to tetanus, bacterial invasion, infectious disease infection and other hazards.

[0014] In response to the above situation, an embodiment of the present application provides an indwelling needle.

[0015] The following describes in detail 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.

[0016] 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. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0017] 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 first feature is at a higher level than 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 first feature is at a lower level than the second feature. The technical solution of the present application will be further illustrated below with reference to the accompanying drawings and through specific implementation methods.

[0018] Please refer to Figures 1 to 6. This embodiment provides an indwelling needle, including a needle seat 1, a catheter seat 2 and a needle tip protective shell 3, wherein a needle tube 11 is provided on the needle seat 1, an acupuncture channel 21 and an injection side channel 22 are provided on the catheter seat 2, a catheter 23 is provided at the end of the acupuncture channel 21, an elastic silicone block 4 is provided in the acupuncture channel 21, a limiting plate 5 and an elastic plate 6 are provided in the needle tip protective shell 3, a first limiting hole 51 allowing the needle tube 11 to pass through is opened on the limiting plate 5, and a second limiting hole 61 allowing the needle tube 11 to pass through is opened on the elastic plate 6.

[0019] In the factory state, the needle tube 11 passes through the first limiting hole 51 and the second limiting hole 61 in the needle tip protection shell 3 , pierces the elastic silicone block 4 and then extends into the catheter 23 .

[0020] In the needle withdrawal state, the elastic silicone block 4 seals the puncture hole of the needle tube 11 by its own elastic force, and the elastic sheet 6 is deformed by its own elastic force, causing the first limiting hole 51 and the second limiting hole 61 to be misaligned, and blocking the passage path of the needle tube 11.

[0021] In one embodiment, the elastic silicone block 4 includes two spaced-apart isolation plugs 41, with a hollow cannula 42 connected between the two isolation plugs 41. The needle 11 passes through one isolation plug 41, then through the cavity of the hollow cannula 42, and then out of the other isolation plug 41. The hollow cannula 42 reduces the passage resistance of the needle 11, and the isolation plugs 41 at both ends improve the sealing of the needle 11's passage path, effectively preventing leakage of the injection solution.

[0022] In one embodiment, when the needle tube 11 exits the elastic silicone block 4 during the withdrawal process, the elastic sheet 6 deforms and cooperates with the limiting sheet 5 to bend the needle tube 11. Thus, on the one hand, the deformation of the elastic sheet 6 changes the position of the second limiting hole 61, blocking the path of the needle tube 11. On the other hand, the deformation of the elastic sheet 6 exerts a force on the needle tube 11, causing the needle tube 11 to bend or even break at the first limiting hole 51, making the needle tube 11 unable to be reused and preventing secondary infection.

[0023] In one embodiment, a catheter seat back cover 7 is provided at the mouth end of the acupuncture channel 21, and the catheter seat back cover 7 limits the axial position of the elastic silicone block 4 to prevent the elastic silicone block 4 from moving out with the needle tube 11 when the needle is withdrawn, resulting in sealing failure, and an avoidance opening 71 is provided on the catheter seat back cover 7 in the same direction as the bending direction of the needle tube 11 to prevent the needle tip from damaging or touching the elastic silicone block 4 or the catheter seat back cover 7 when the needle tube 11 is bent.

[0024] In one embodiment, the elastic sheet 6 is bent and formed as one piece, as shown in Figure 4, and includes a fixed portion 62, a V-shaped energy storage portion 63 and an opening portion 64 connected in sequence. A limit block 31 is provided in the needle tip protection shell 3 to clamp the fixed portion 62. The V-shaped energy storage portion 63 gives the opening portion 64 a force to repel the fixed portion 62 relative to the fixed portion 62. The second limit hole 61 is formed on the opening portion 64 to achieve the position of the second limit hole 61 being offset when the needle is withdrawn, and when the energy stored in the V-shaped energy storage portion 63 is large enough, it can provide the force required to bend the needle tube 11.

[0025] In one embodiment, a snap-fit ​​portion 65 extending toward the catheter hub 2 is provided on the opening portion 64. The catheter hub 2 is inserted into the needle tip protection shell 3. A protrusion 24 is provided on the insertion portion of the catheter hub 2. The snap-fit ​​portion 65 engages with the protrusion 24. This ensures that the components are structurally stable when shipped from the factory.

[0026] In one embodiment, the limiting piece 5 is located at the entrance of the needle tube 11 on the needle tip protection shell 3, and the needle tip protection shell 3 is provided with a slot 32 allowing the limiting piece 5 to be inserted, so as to facilitate accurate installation of the limiting piece 5 in the needle tip protection shell 3.

[0027] In one embodiment, one side of the needle tip protection shell 3 is open, and a cover plate 8 with a snap connection is provided on the opening surface, which facilitates assembly and maintenance in case of abnormalities. The cover plate 8 can also prevent blood from leaking from the needle tip and also has the function of preventing the needle tip from being pierced again by humans.

[0028] In addition, the needle seat 1 and the needle tip protection shell 3 are plugged and fixed, and the plug-in structures of the two are interchangeable. A ridge 33 is provided on the insertion part of the needle tip protection shell 3, and a card slot 12 is provided on the needle seat 1 corresponding to the ridge 33, and the needle seat 1 and the needle tip protection shell 3 are respectively marked with arrows 13 for guiding separation, which facilitates correct use and convenient needle withdrawal.

[0029] In summary, the above-mentioned indwelling needle achieves reliable sealing after the needle is withdrawn through the elastic silicone block, and then blocks the needle tube's passage path or even damages the needle tube through the elastic sheet and the limit sheet in the needle tip protective shell, thereby avoiding the reuse of the puncture needle, avoiding leakage, secondary infection and other usage conditions, and improving the safety of the indwelling needle.

[0030] The indwelling needle provided in the embodiment of the present application improves its safety and convenience in use, avoids blood spillage and reuse of the needle core.

[0031] There are various changes and modifications to the embodiments of the present application, and these changes and modifications all fall within the scope of the present application to be protected.

Claims

1. An indwelling needle, comprising a needle seat (1), a catheter seat (2) and a needle tip protective shell (3), wherein the needle seat (1) is provided with a needle tube (11), the catheter seat (2) is provided with an acupuncture channel (21) and an injection side channel (22), and a catheter (23) is provided at the end of the acupuncture channel (21), wherein: The acupuncture tube (21) is provided with an elastic silicone block (4), the needle tip protection shell (3) is provided with a limiting plate (5) and an elastic plate (6), the limiting plate (5) is provided with a first limiting hole (51) allowing the needle tube (11) to pass through, and the elastic plate (6) is provided with a second limiting hole (61) allowing the needle tube (11) to pass through. In the factory state, the needle tube (11) passes through the first limiting hole (51) and the second limiting hole (61) in the needle tip protection shell (3), pierces the elastic silicone block (4), and then extends into the catheter (23); In the needle withdrawal state, the elastic silicone block (4) seals the puncture hole of the needle tube (11) by virtue of the elastic force of the elastic silicone block (4), and the elastic sheet (6) is deformed by the elastic force of the elastic sheet (6), so that the first limiting hole (51) and the second limiting hole (61) are misaligned, and the passage path of the needle tube (11) is blocked.

2. The indwelling needle according to claim 1, wherein: The elastic silicone block (4) comprises two isolation plugs (41) arranged at intervals, a hollow sleeve (42) is connected between the two isolation plugs (41), and the needle tube (11) penetrates one isolation plug (41), passes through the cavity of the hollow sleeve (42), and then passes out from the other isolation plug (41).

3. The indwelling needle according to claim 1, wherein: The elastic sheet (6) comprises a fixing portion (62), a V-shaped energy storage portion (63) and an opening portion (64) which are connected in sequence. A limiting block (31) for clamping the fixing portion (62) is arranged in the needle tip protection shell (3). The V-shaped energy storage portion (63) exerts a force on the opening portion (64) to repel the fixing portion (62). The second limiting hole (61) is formed on the opening portion (64).

4. The indwelling needle according to claim 3, wherein: The opening portion (64) is provided with a buckle portion (65) extending toward the catheter seat (2); the catheter seat (2) is inserted into the needle tip protective shell (3); and a protrusion (24) is provided on the insertion portion of the catheter seat (2); the buckle portion (65) is buckled with the protrusion (24).

5. The indwelling needle according to claim 1, wherein: The limiting piece (5) is located at the insertion opening of the needle tube (11) on the needle tip protection shell (3), and a slot (32) allowing the limiting piece (5) to be inserted is provided on the needle tip protection shell (3).

6. The indwelling needle according to claim 1, wherein: During the needle withdrawal process, when the needle tube (11) withdraws from the elastic silicone block (4), the elastic sheet (6) deforms and cooperates with the limiting sheet (5), so that the needle tube (11) is bent.

7. The indwelling needle according to claim 6, wherein: The mouth end of the acupuncture tube (21) is provided with a catheter seat rear cover (7), the catheter seat rear cover (7) limits the axial position of the elastic silicone block (4), and the catheter seat rear cover (7) is provided with an avoidance opening (71) consistent with the bending direction of the needle tube (11).

8. The indwelling needle according to claim 1, wherein: One side of the needle tip protection shell (3) is open, and a cover plate (8) connected by snap-fit ​​is arranged on the opening surface.

9. The indwelling needle according to claim 1, wherein: The needle seat (1) and the needle tip protection shell (3) are plugged and fixed, and a convex ridge (33) is provided on the insertion portion of one of the needle seat (1) and the needle tip protection shell (3), and a slot (12) is provided on the other of the needle seat (1) and the needle tip protection shell (3) corresponding to the convex ridge (33).

10. The indwelling needle according to claim 9, wherein: The needle seat (1) and the needle tip protective shell (3) are respectively marked with arrows (13) indicating separation.

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