Remaining needle for dialysis

Abstract

The utility model discloses a remaining needle for dialysis, and relates to the technical field of medical instruments. The indwelling needle aims to solve the problems that an existing indwelling needle is prone to pricking injury after being removed, blood overflows, an assembly rotates and slips during operation, and the needle removing resistance is large. The anti-needling needle comprises the catheter assembly and the steel needle assembly, the steel needle is provided with the spring clamping piece and the indentation and matched with the shaft shoulder in the connecting base assembly, the spring clamping piece is blocked firstly when the needle is removed, and when the steel needle is about to be completely pulled out, the spring clamping piece is automatically closed to wrap the needle point, and needling prevention is achieved. A hollow isolation plug is arranged in the connecting base assembly and used for scraping blood on the surface of the steel needle to prevent blood overflow when the needle is removed, and the needle removing force is reduced through the hollow design. The connecting seat assembly is formed by sleeving a front part and a rear part which are provided with anti-rotation convex ribs, and the outer surface of the connecting seat assembly is provided with holding lines, so that relative rotation and slipping in operation are effectively prevented. The device is simple in structure, integrated in function and safe and convenient to use.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, specifically, relate to a kind of for hemodialysis's indwelling needle. BACKGROUND

[0002] Disposable indwelling needle for dialysis is the key consumable for establishing extracorporeal circulation blood passage in blood purification treatment. Its use mode is usually to puncture into the internal arteriovenous fistula or artificial blood vessel of patient together with catheter and steel needle, after puncture success, withdraw and remove steel needle, only the catheter of soft material is indwelt in blood vessel. Subsequently, the indwelt catheter is connected with dialysis pipeline, and blood passage is formed.

[0003] Compared with traditional steel internal fistula needle, the catheter of the indwelling needle is usually made of high molecular material such as FEP (fluorinated ethylene propylene copolymer), which has excellent biocompatibility and flexibility, and can significantly reduce the stimulation and damage to the inner wall of blood vessel.

[0004] However, the indwelling needle for dialysis in the prior art still has some deficiencies: after the withdrawal of steel needle, medical staff may be injured by needle, and there is a risk of transmission of blood-borne diseases; when withdrawing steel needle, blood overflow may occur due to blood remaining on the surface of steel needle, and the operating environment is contaminated; when connecting dialysis pipeline, the part held by operator may slip or rotate relatively between components due to force, affecting the connection efficiency and stability; part of the needle-sticking prevention structure generates large resistance when withdrawing needle, affecting the operation feeling of medical staff. Therefore, it is necessary to improve the structure of existing indwelling needle for dialysis to overcome the above-mentioned defects. UTILITY MODEL CONTENT

[0005] The utility model aims at overcoming the deficiencies of prior art, and provides an indwelling needle for dialysis with optimized structure, safe and convenient to use.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0007] An indwelling needle for dialysis includes catheter assembly and steel needle assembly arranged in the catheter assembly. The catheter assembly includes catheter, catheter seat and connecting seat assembly; the steel needle assembly includes steel needle and needle seat.

[0008] The spring card is arranged on the steel needle and is accommodated in the inside of the connecting seat assembly; the inner wall of the connecting seat assembly is provided with a shaft shoulder for blocking the spring card; the steel needle is provided with an indentation at the end close to the needle tip; when the steel needle is in the puncture position, the rod of the steel needle pries open the spring card, and in the process of withdrawing the steel needle, the pried open spring card is blocked by the shaft shoulder and cannot be withdrawn together with the steel needle; when the steel needle is withdrawn to the position that the indentation is aligned with the spring card, the spring card is no longer pried open, is closed to wrap the needle tip of the steel needle, and overcomes the blocking of the shaft shoulder and is withdrawn together with the steel needle.

[0009] Preferably, the inside of the connecting seat assembly is provided with a separation plug, and the steel needle passes through the separation plug; in the process of withdrawing the steel needle, the separation plug is used for wiping the blood adhered to the outer surface of the steel needle, and plays a role of preventing blood overflow.

[0010] Preferably, the separation plug is a hollow structure, so as to reduce the contact area with the steel needle, thereby reducing the friction resistance when the needle is withdrawn. The separation plug is composed of a separation plug front block and a separation plug rear block.

[0011] Preferably, the connecting seat assembly is formed by snap fitting of a connecting seat front pipe and a connecting seat rear pipe; the matching connection part of the connecting seat front pipe and the connecting seat rear pipe is provided with anti-rotation convex ribs matched with each other, so as to prevent relative rotation of the two pipes when being twisted.

[0012] Preferably, the outer surface of the connecting seat assembly is provided with a holding pattern for anti-skid, so as to increase the friction force when an operator holds, and prevent slipping.

[0013] Preferably, the catheter assembly further comprises an extension pipe and a two-way pipe connected between the catheter seat and the connecting seat assembly in sequence.

[0014] Preferably, the steel needle assembly further comprises an exhaust connector assembly arranged at the rear end of the needle seat.

[0015] Preferably, the utility model further comprises a sheath, the sheath is detachably connected on the needle seat and covers the whole catheter assembly.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The needle puncture prevention function is reliable: through the ingenious cooperation of the spring card, the shaft shoulder of the inner wall of the connecting seat and the indentation of the steel needle, the automatic and reliable wrapping of the needle tip after the steel needle is withdrawn is realized. When the steel needle is completely withdrawn, the indentation provides a limit for the closed spring card, prevents it from falling off, and greatly improves the operation safety.

[0018] 2. The effect of preventing overflow of blood is remarkable: the isolation plug arranged in the connecting seat assembly can effectively remove the blood residue on the surface of the steel needle when it is withdrawn, prevent the blood from overflowing from the rear end of the needle seat, and keep the operation area clean.

[0019] 3. Stable grip and anti-rotation: the connecting seat assembly is connected by two parts in front and back, and the anti-rotation convex ribs realize axial locking, effectively solving the problem of relative rotation of the connecting seat itself when rotating the two-way component. At the same time, the external gripping thread design enhances the firmness of the grip and prevents slipping.

[0020] 4. Needle withdrawal hand feeling optimization: the hollow design of the isolation plug reduces the contact area and friction force with the steel needle, significantly reduces the force required for needle withdrawal, and improves the comfort and smoothness of clinical use. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is the overall structure schematic diagram of the indwelling needle for dialysis of the utility model;

[0022] Figure 2 is Figure 1 the sectional view of A-A;

[0023] Figure 3 is Figure 2 the local enlarged view of B part;

[0024] Figure 4 is the structure schematic diagram after the sheath is removed of the utility model;

[0025] Figure 5 is Figure 4 the sectional view of C-C;

[0026] Figure 6 is the state schematic diagram of the spring card closing and wrapping the needle tip after the steel needle is completely withdrawn;

[0027] Figure 7 is the cooperation relationship schematic diagram of the connecting seat front pipe and the connecting seat rear pipe;

[0028] Figure 8 is Figure 7 the sectional view of D-D;

[0029] Figure 9 is the cooperation relationship schematic diagram of the isolation plug front block and the isolation plug rear block.

[0030] In the figure: 1, sheath; 2, steel needle; 3, catheter; 4, catheter seat; 5, extension tube; 6, two-way; 7, connecting seat front pipe; 8, isolation plug; 9, connecting seat rear pipe; 10, spring card; 11, needle seat; 12, exhaust joint assembly; 13, indentation; 14, anti-rotation convex rib; 15, isolation plug front block; 16, isolation plug rear block. DETAILED DESCRIPTION

[0031] The utility model is further described below in combination with specific embodiments.

[0032] The description of the utility model is only an embodiment of structural and functional description, and the scope of the utility model is not limited by the embodiment described in the text.

[0033] As Figures 1-9 shown, the embodiment is realized by the following technical solutions:

[0034] The dialysis indwelling needle provided by the utility model mainly consists of a catheter assembly, a steel needle assembly and a sheath 1.

[0035] The catheter assembly sequentially comprises, from the front end to the rear end: a soft catheter 3, the front end of which is used for being placed into the blood vessel of a patient; a catheter seat 4 connected with the rear end of the catheter 3; an extension tube 5 connected with the catheter seat 4; a two-way connector 6 connected with the extension tube 5; and a connecting seat assembly connected with the two-way connector 6. The connecting seat assembly is composed of a connecting seat front tube 7 and a connecting seat rear tube 9, and an isolation plug 8 is contained in the connecting seat assembly.

[0036] The steel needle assembly sequentially comprises, from the front end to the rear end: an elongated steel needle 2, the needle tip of which is sharp and used for puncture; a needle seat 11 fixed with the rear end of the steel needle 2, which is convenient for an operator to hold; and an exhaust connector assembly 12 arranged at the rear end of the needle seat 11.

[0037] In the assembled state, the steel needle 2 penetrates through the entire catheter assembly, and the needle tip of the steel needle 2 protrudes from the front end of the catheter 3. The needle seat 11 of the steel needle assembly is located at the rear of the connecting seat assembly. The sheath 1 is sleeved on the needle seat 11 and covers the entire catheter assembly to protect the needle tip and maintain sterility.

[0038] The core innovation point of the utility model is embodied in the synergistic effect of the following structures:

[0039] The needle puncture prevention structure:

[0040] A spring card 10 made of metal is buckled on the stem of the steel needle 2, and the spring card 10 is in a closed or semi-closed state in the natural state. After assembly, the spring card 10 is located in the interior of the connecting seat rear tube 9. An annular shaft shoulder is formed on the inner wall of the connecting seat rear tube 9. Meanwhile, a pressure mark 13 is processed at the position close to the needle tip of the steel needle 2.

[0041] In the initial state before puncture, the rod of the steel needle 2 passes through the spring card 10, which is expanded outward. When the puncture is completed and the medical staff withdraws the steel needle assembly backward, the outer edge of the expanded spring card 10 abuts against the shaft shoulder inside the connecting seat rear tube 9, so as to be blocked and unable to move backward together with the steel needle 2. With the continuous backward withdrawal of the steel needle 2, when the indentation 13 at the front end of the steel needle 2 moves to the position at the rear end of the spring card 10, at this time, the front end of the spring card 10 loses the support of the steel needle 2, and the spring card 10 rapidly shrinks and closes due to its elasticity, and tightly wraps the needle tip of the steel needle 2. At this time, the overall outer diameter of the closed spring card 10 is smaller than the inner diameter of the shaft shoulder, and the closed spring card 10 is no longer blocked by the shaft shoulder, and can be smoothly withdrawn together with the steel needle 2 (limited by the indentation 13 to drive). The existence of the indentation 13 also plays an axial limiting role on the closed spring card 10, preventing it from slipping off the needle tip.

[0042] Anti-overflow and reduced needle withdrawal force structure:

[0043] Inside the connecting seat assembly, an isolation plug 8 is embedded. The isolation plug 8 is formed by the abutment of the isolation plug front block 15 and the isolation plug rear block 16, forming a hollow channel for the steel needle 2 to pass through. When the steel needle 2 with blood passes through and is withdrawn, the edge of the isolation plug 8 tightly abuts against the surface of the steel needle 2, scraping off the blood and blocking it inside the connecting seat assembly, thereby effectively preventing the blood from overflowing from the end of the connecting seat rear tube 9.

[0044] In particular, the isolation plug 8 is designed as a hollow structure rather than a solid structure, which makes the steel needle 2 only contact the inner edges of the front and rear ends of the isolation plug 8, greatly reducing the contact area and friction, thereby significantly reducing the resistance during needle withdrawal and improving the operation feel.

[0045] Anti-rotation and anti-slip structure:

[0046] The connecting seat assembly is fixed by snap fitting of the connecting seat front tube 7 and the connecting seat rear tube 9. In order to prevent the connecting seat front tube 7 and the connecting seat rear tube 9 from rotating relative to each other when the rotating two-way connector 6 is connected to the dialysis pipeline, anti-rotation protrusions 14 are arranged on the mating surfaces of the two tubes. These protrusions play a role in strengthening the locking in the circumferential direction, ensuring the rigidity of the connecting seat assembly as a whole. In addition, on the outer surface of the connecting seat assembly, especially the part mainly held by the operator, knurling or strip-shaped holding lines are designed, which increase the friction coefficient between the hand and the surface of the assembly, making the holding more stable and not easy to slip.

[0047] Of course, the above only the preferred embodiments of the present application, can not be considered to limit the scope of the embodiments of the present application. The present application is not limited to the above examples, the ordinary skilled in the art within the scope of the present application made by the equivalent changes and improvements, should be attributed to the present application within the scope of the patent.

Claims

1. A dialysis indwelling needle, comprising a catheter assembly and a steel needle assembly arranged in the catheter assembly; the catheter assembly comprises a catheter (3), a catheter seat (4) and a connecting seat assembly; the steel needle assembly comprises a steel needle (2) and a needle seat (11); characterized in that, a spring card (10) is buckled on the steel needle (2), and the spring card (10) is arranged in the connecting seat assembly; an axial shoulder for blocking the spring card (10) is arranged on the inner wall of the connecting seat assembly; a pressure mark (13) is arranged on the end of the steel needle (2) close to the needle tip; when the steel needle (2) is in the puncture position, the rod part of the steel needle (2) pries open the spring card (10), and in the process of withdrawing the steel needle (2), the pried open spring card (10) is blocked by the axial shoulder and cannot be withdrawn together with the steel needle (2); when the steel needle (2) is withdrawn to the position where the pressure mark (13) is aligned with the spring card (10), the spring card (10) is no longer pried open, shrinks and closes to wrap the needle tip of the steel needle (2), and is no longer blocked by the axial shoulder, and is withdrawn together with the steel needle (2).

2. The indwelling needle for dialysis according to claim 1, wherein an isolation plug (8) is arranged in the connecting seat assembly, and the steel needle (2) passes through the isolation plug (8); in the process of withdrawing the steel needle (2), the isolation plug (8) is used to wipe off the blood adhered to the outer surface of the steel needle (2).

3. The indwelling needle for dialysis according to claim 2, wherein the isolation plug (8) is a hollow structure to reduce the contact area with the steel needle (2); the isolation plug (8) is composed of an isolation plug front block (15) and an isolation plug rear block (16).

4. The indwelling needle for dialysis according to claim 1, wherein the connecting seat assembly is formed by buckling and sleeving a connecting seat front tube (7) and a connecting seat rear tube (9); the connecting seat front tube (7) and the connecting seat rear tube (9) are provided with anti-rotation convex ribs (14) matched with each other at the connection part to prevent relative rotation of the two.

5. The indwelling needle for dialysis according to claim 4, wherein the outer surface of the connecting seat assembly is provided with anti-slip holding lines.

6. The indwelling needle for dialysis according to claim 1, wherein the catheter assembly further comprises an extension tube (5) and a two-way valve (6) connected in sequence between the catheter seat (4) and the connecting seat assembly.

7. The indwelling needle for dialysis according to claim 1, wherein the steel needle assembly further comprises an exhaust joint assembly (12) arranged at the rear end of the needle seat (11).

8. The indwelling needle for dialysis according to claim 1, wherein a sheath (1) is further provided, which is detachably connected to the needle seat (11) and covers the entire catheter assembly.

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