CN209596322U - A kind of internal arteriovenous fistula cannula needle - Google Patents

Abstract

An indwelling needle for an arteriovenous fistula, characterized in that it includes a puncture needle assembly (1) and an indwelling needle assembly (2), the puncture needle assembly (1) includes a puncture needle fixing seat (14), fixed on the puncture needle The puncture needle (8) at the proximal end of the seat (14) and the puncture-proof seat tube (13) penetrated by the puncture needle (8), the puncture needle (8) near-end is provided with the puncture needle needle point (3), and the puncture-proof seat tube ( The proximal end of 13) is provided with a claw seat (21), a sliding groove (26) is provided between the anti-stab seat tube (13) and the claw seat (21), and a magnetic metal slider is arranged in the sliding groove (26) (11). The utility model can reduce the number of punctures and alleviate the puncture pain of hemodialysis patients. Protect arteriovenous fistula vessels and reduce arteriovenous fistula complications. Solve the problem of difficult internal fistula puncture and improve the success rate of puncture. The patient is comfortable during dialysis, the work efficiency of nurses is improved, the needle tip can be effectively prevented, and it is convenient for safe disposal.

Description

Arteriovenous fistula cannula indwelling needle

technical field

The invention relates to an arteriovenous fistula cannula indwelling needle.

Background technique

Among the clinical arteriovenous fistula puncture methods, the buttonhole method is one of the commonly used methods in clinical practice. It adopts a single needle insertion channel, which can improve the success rate of puncture, reduce the pain and anxiety of patients, reduce the occurrence of arteriovenous fistula puncture complications, and increase the aesthetics of the patient's internal fistula. However, the requirements for forming a subcutaneous tunnel at the initial stage are relatively high: (1) The “five-same” principle must be strictly followed when puncturing with a sharp needle, that is, the puncture point, puncture angle, puncture depth, and the position of the patient’s arm on the side of the arteriovenous fistula are the same, and the patient’s arm on the side of the arteriovenous fistula should be placed in the same position, and the patient’s arm should be placed on the side of the arteriovenous fistula. A nurse performs a puncture. (2) Every time the puncture is performed, the blood scab on the puncture point needs to be removed to prevent the puncture needle from deviating from the original puncture point or the scab entering the blood vessel and causing infection. (3) When selecting the puncture site, avoid the arteriovenous fistula vessels in the lower 1/3 of the lateral radius, so as to avoid pressure and hemostasis and subcutaneous hematoma when the needle is pulled out due to the easy-to-slip blood vessels at this site. The needle-implanted device is punctured 6-12 times to assist in tunnel formation.

Disadvantages: Clinically, due to the high cost of using tunnel nails or titanium guide pin implantation devices, it is difficult to implement them in practice, and the use of tunnel nails or titanium guide pin implantation devices to assist in the formation of tunnels is useless. The puncture nurses are relatively fixed, which makes it difficult to arrange shifts in departments. Even if the same person punctures, it is difficult to ensure the same puncture angle and puncture depth. The lack of smoothness in the formation of the tunnel will bring difficulties to the subsequent puncture and increase the complications of internal fistula.

Tunnel nails or titanium-guided needle implants need to be placed and removed, which increases the chance of infection. Tunnel nails are usually used in foreign countries. After each puncture, the tunnel nails are put in, and the tunnel nails are taken out after the second puncture. Over time, tunnel nails are formed. However, tunnel nails are expensive and have not been popularized in China. The method of indwelling is adopted. , not only eliminates the hidden danger of infection caused by repeated insertion and insertion of tunnel nails, but also greatly reduces the workload of nursing staff.

Contents of the invention

The object of the present invention is to provide an arteriovenous fistula cannula indwelling needle to solve the above-mentioned defects in the background technology.

To achieve the above object, the present invention provides the following technical solutions:

An indwelling needle for an arteriovenous fistula, characterized in that it includes a puncture needle assembly (1) and an indwelling needle assembly (2), the puncture needle assembly (1) includes a puncture needle fixing seat (14), fixed on the puncture needle The puncture needle (8) at the proximal end of the seat (14) and the puncture-proof seat tube (13) penetrated by the puncture needle (8), the puncture needle (8) near-end is provided with the puncture needle needle point (3), and the puncture-proof seat tube ( The proximal end of 13) is provided with a claw seat (21), a sliding groove (26) is provided between the anti-stab seat tube (13) and the claw seat (21), and a magnetic metal slider is arranged in the sliding groove (26) (11), one side of the sliding groove (26) is embedded with a magnet (12), and the center of the sliding groove (26) is provided with a through hole (27) for the puncture needle (8) to pass through, so that the puncture needle (8) does not wear When passing through the through hole (27), the magnetic metal slider (11) is in a position attracted by the magnet (12) and in contact with the magnet (12) in the slide groove (26), and the outer wall of the puncture needle (8) is provided with a limiting protrusion. Body (18), used to prevent the puncture needle tip (3) of the puncture needle (8) from pulling out and separating from the far end of the puncture-proof seat tube (13);

The indwelling needle assembly (2) includes the indwelling needle connector (5), the indwelling needle (4) fixedly connected with the indwelling needle connector (5), the connector (6) and the silicone tube (7), the indwelling needle connector (5 ) is connected to the connector (6) through a silicone tube (7) and communicates with each other internally, the far end of the connector (6) is a medical standard Luer connector (17), and the medical standard Luer connector (17) is passed through an external thread (20 ) is connected to the end cap (9), the far end of the end cap (9) is provided with a sealing rubber plug (10), and the outer wall of the end cap (9) is provided with locking teeth (22), which are ring-shaped protrusions, The clamp teeth (22) are detachably engaged with the claw base (21), and the two sides of the indwelling needle connector (5) are respectively provided with a butterfly wing (24). The butterfly wing (24) is a sheet structure, It is integrated with the indwelling needle connector (5), and the silicone tube (7) is provided with a closing clip (25).

The puncture needle (8) is hollow tubular, made of stainless steel, aluminum metal, aluminum alloy, titanium metal or titanium alloy, its distal end communicates with the puncture needle holder (14), and the puncture needle tip (3) is Sharp shapes with geometric facets.

The puncture needle holder (14) is made of transparent material plastic, and its whole is tubular, and its proximal end is connected with the puncture needle (8) by sealing and injection molding to form an integrated structure, and the distal end of the puncture needle holder (14) is detachably sealed. Connected with a plug cap (15), the plug cap (15) is a hollow structure, and its near end is provided with a waterproof gas-permeable membrane (23), and the waterproof gas-permeable membrane (23) closes the proximal end of the plug cap (15).

The magnetic metal slider (11) is coin-shaped, made of stainless steel, and has a thickness of 0.5-1.5 mm.

The inside of the indwelling needle (4) is an indwelling cavity pipeline (16) passing through front and back, and the proximal side wall of the indwelling needle (4) is provided with a side hole (19) communicating with the indwelling cavity pipeline (16).

The indwelling needle (4) is made of ethylene-tetrafluoroethylene copolymer (ETFE), polyurethane, nylon resin or polypropylene, and is transparent or translucent.

The polytetrafluoroethylene (EPTFE).

Compared with prior art, the beneficial effect of the present invention is:

The advantages of the cannula indwelling needle for arteriovenous fistula of the present invention:

1. Reduce the number of punctures and reduce the puncture pain of hemodialysis patients.

2. Protect arteriovenous fistula vessels and reduce arteriovenous fistula complications.

3. Solve the problem of difficult internal fistula puncture and improve the success rate of puncture.

4. The patient is comfortable during dialysis.

5. Improve the work efficiency of nurses.

6. Effectively prevent needle tip injury and facilitate safe disposal.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the overall structure of the present invention;

Fig. 2 is a schematic cross-sectional structural view of the indwelling needle assembly of the present invention;

Fig. 3 is a schematic structural view of the puncture needle assembly of the present invention.

Fig. 4 is one of the end face structure schematic diagrams of the anti-stab seat tube of the present invention.

Fig. 5 is the second schematic diagram of the end face structure of the anti-stab seat tube of the present invention.

Fig. 6 is a schematic cross-sectional structure diagram of the anti-stab seat tube of the present invention.

In the figure: 1, puncture needle assembly; 2, indwelling needle assembly; 3, puncture needle tip; 4, indwelling needle; 5, indwelling needle connector; 6, connector; 7, silicone tube; 8, puncture needle; 9, End cap; 10, sealing rubber plug; 11, magnetic metal slider; 12, magnet; 13, anti-stab seat tube; 14, puncture needle holder; 15, plug cap; 16, indwelling cavity pipe; 18. Limiting convex body; 19. Side hole; 20. External thread; 21. Claw seat; 22. Clamping teeth; 23. Waterproof and breathable membrane; 24. Butterfly wing; Sliding groove; 27, through hole.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Referring to Fig. 1-6, the present invention provides a technical solution:

In the description of the present invention, the position close to the end of the needle tip 3 is collectively referred to as the proximal end, and the position away from the end of the needle tip 3 is collectively referred to as the distal end.

An indwelling needle for an arteriovenous fistula, characterized in that it includes a puncture needle assembly (1) and an indwelling needle assembly (2), the puncture needle assembly (1) includes a puncture needle fixing seat (14), fixed on the puncture needle The puncture needle (8) at the proximal end of the seat (14) and the puncture-proof seat tube (13) penetrated by the puncture needle (8), the puncture needle (8) near-end is provided with the puncture needle needle point (3), and the puncture-proof seat tube ( The proximal end of 13) is provided with a claw seat (21), a sliding groove (26) is provided between the anti-stab seat tube (13) and the claw seat (21), and a magnetic metal slider is arranged in the sliding groove (26) (11), one side of the sliding groove (26) is embedded with a magnet (12), and the center of the sliding groove (26) is provided with a through hole (27) for the puncture needle (8) to pass through, so that the puncture needle (8) does not wear When passing through the through hole (27), the magnetic metal slider (11) is in a position attracted by the magnet (12) and in contact with the magnet (12) in the slide groove (26), and the outer wall of the puncture needle (8) is provided with a limiting protrusion. Body (18), used to prevent the puncture needle tip (3) of the puncture needle (8) from pulling out and separating from the far end of the puncture-proof seat tube (13);

The indwelling needle assembly (2) includes the indwelling needle connector (5), the indwelling needle (4) fixedly connected with the indwelling needle connector (5), the connector (6) and the silicone tube (7), the indwelling needle connector (5 ) is connected to the connector (6) through a silicone tube (7) and communicates with each other internally, the far end of the connector (6) is a medical standard Luer connector (17), and the medical standard Luer connector (17) is passed through an external thread (20 ) is connected to the end cap (9), the far end of the end cap (9) is provided with a sealing rubber plug (10), and the outer wall of the end cap (9) is provided with locking teeth (22), which are ring-shaped protrusions, The clamp teeth (22) are detachably engaged with the claw base (21), and the two sides of the indwelling needle connector (5) are respectively provided with a butterfly wing (24). The butterfly wing (24) is a sheet structure, It is integrated with the indwelling needle connector (5), and the silicone tube (7) is provided with a closing clip (25).

The butterfly-shaped flanks 24 increase the contact area with the skin, and stick the needle on the human skin with adhesive tape, which can effectively fix the indwelling needle assembly and prevent the indwelling needle assembly from shifting and slipping. The contact area of the needle body is increased during the puncture operation, which is convenient for puncture.

The sealing rubber plug 10 can be pierced by the puncture needle 8. After the puncture needle is pulled out, the sealing rubber plug 10 can be restored by the elasticity of its own rubber, and then the puncture hole is closed to achieve a seal without leakage of liquid.

The puncture needle (8) is hollow tubular, made of stainless steel, aluminum metal, aluminum alloy, titanium metal or titanium alloy, its distal end communicates with the puncture needle holder (14), and the puncture needle tip (3) is Sharp shapes with geometric facets.

The puncture needle holder (14) is made of transparent material plastic, and its whole is tubular, and its proximal end is connected with the puncture needle (8) by sealing and injection molding to form an integrated structure, and the distal end of the puncture needle holder (14) is detachably sealed. Connected with a plug cap (15), the plug cap (15) is a hollow structure, and its near end is provided with a waterproof gas-permeable membrane (23), and the waterproof gas-permeable membrane (23) closes the proximal end of the plug cap (15).

The magnetic metal slider (11) is coin-shaped, made of stainless steel, and has a thickness of 0.5-1.5 mm.

The inside of the indwelling needle (4) is an indwelling cavity pipeline (16) passing through front and back, and the proximal side wall of the indwelling needle (4) is provided with a side hole (19) communicating with the indwelling cavity pipeline (16).

The indwelling needle (4) is made of ethylene-tetrafluoroethylene copolymer (ETFE), polyurethane, nylon resin or polypropylene, and is transparent or translucent.

Fig. 1 is the puncture state. At this time, the indwelling needle assembly 2 and the puncture needle assembly 1 are combined into one body, and the puncture needle passes out from the indwelling needle 4, which is the puncture state at this time.

Figure 2 shows the state of the indwelling needle in the human body, and Figure 3 shows that after the puncture needle is pulled out, the claw seat 21 is separated from the claw 22, and then the indwelling needle assembly 2 and the puncture needle assembly 1 are separated.

Fig. 4 shows that when the puncture needle 8 passes through the through hole 27, the magnetic metal slider 11 is blocked by the puncture needle 8 on the opposite side of the magnet. The magnet 12 attracts and slides to the position of the through hole 27, thereby realizing the sealing of the through hole 27, preventing the puncture needle 8 from passing through the through hole 27, and isolating the puncture needle tip 3 inside the anti-stab seat tube 13 to realize physical isolation and prevent stabbed.

FIG. 6 is a schematic diagram of the structure of the puncture needle tip 3 inside the stab-proof seat tube 13 , the puncture needle tip 3 is prevented from being pulled out from the stab-proof seat tube 13 by the limiting protrusion 18 . The limiting protrusion 18 can be made directly on the outer wall of the puncture needle 8 by stamping, that is, the metal of the tube wall of the puncture needle 8 is extruded into an outward protrusion deformation through a stamping die; Solder metal bumps.

Materials of parts not mentioned in the embodiments can be injection molded or molded with plastics. The connection relationship between components is made into detachable connections or waterproof and sealed connections according to the functions and requirements of the components.

The arteriovenous fistula puncture needle is designed to be an indwelling tunnel needle. After the first puncture, the indwelling needle is inserted. After a period of time, when the subcutaneous tunnel is formed, the indwelling needle is removed and punctured with a blunt needle. The diameter of the indwelling needle is 17G, and the material can be coated with heparin.

Puncture method:

Routinely disinfect the skin at the puncture site, take out the sheath of the indwelling needle, gently rotate the needle core, (so that the tube can be fed and pulled out smoothly) tighten the skin, and directly puncture the blood vessel at 25-40 degrees above the blood vessel puncture point, slowly Insert the needle, lower the angle after observing the return of blood, continue to insert the needle 0.2CM, flatten the trocar, fix the butterfly wing with the left hand, retreat the needle core 0.5-1.0CM with the right hand, send the tube, withdraw the needle core, and close the clip at 7 places on the silicone tube 25 clamped, medical standard Luer connector 17 connected to dialysis tubing or heparin cap. The closure clip 25 is a standard medical closure clip, which belongs to the prior art and is widely used in pipeline closure occasions such as infusion sets and indwelling needles.

The puncture needle can also be marked with a scale of 0.5 cm and 1.0 cm at a suitable position as required, so as to facilitate observation of the displacement of the push needle.

The whole exterior of the present invention can also add transparent fixing cylinder box, as outer packing.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and those described in the above-mentioned embodiments and description are only preferred examples of the present invention, and are not intended to limit the present invention, without departing from the spirit and scope of the present invention. Under the premise, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (4)

1. a kind of internal arteriovenous fistula cannula needle, it is characterised in that: including puncture needle component (1) and indwelling needle assembly (2),

Puncture needle component (1) include puncture needle fixing seat (14), be fixed on the puncture needle (8) of puncture needle fixing seat (14) proximal end with And it is punctured the perforative anti-stab seat pipe (13) of needle (8), puncture needle (8) proximal end is equipped with puncture needle needle point (3), anti-stab seat pipe (13) Proximal end is equipped with master jaw (21), is equipped with sliding groove (26) between anti-stab seat pipe (13) and master jaw (21), sets in sliding groove (26) Be magnetic metal block (11), and the side of sliding groove (26) is embedded with magnet (12), and sliding groove (26) center is equipped with for puncture needle (8) through-hole (27) being pierced by, when so that puncture needle (8) being not passed through through-hole (27), magnetic metal sliding block (11) is in sliding groove (26) in the position for being attracted and being contacted with magnet (12) by magnet (12) in, puncture needle (8) outer wall is equipped with limit convex body (18), It is separated for preventing the puncture needle needle point (3) of puncture needle (8) from pulling out from the distal end of anti-stab seat pipe (13)；

Indwelling needle assembly (2) includes remaining needle connector (5), is fixedly connected with remaining needle connector (5) remaining needle (4), even Device (6) and silicone tube (7) are connect, remaining needle connector (5) is connect by silicone tube (7) with connector (6) and inside is interconnected, The distal end of connector (6) is medical standard luer fittings (17), and medical standard luer fittings (17) are connected by external screw thread (20) The distal end of end cap (9), end cap (9) is equipped with seal rubber plug (10), and end cap (9) outer wall is equipped with card tooth (22), and card tooth (22) is ring-type Protrusion, card tooth (22) are removably connected together with master jaw (21), and remaining needle connector (5) two sides are respectively equipped with a butterfly Flank (24), butterfly flank (24) are laminated structure, are connected as one with remaining needle connector (5), silicone tube (7) is equipped with Closure folder (25).

2. internal arteriovenous fistula cannula needle according to claim 1, it is characterised in that: the puncture needle (8) is hollow Tubulose, be connected to inside distal end and puncture needle fixing seat (14), puncture needle needle point (3) is the sharp shape with geometry section Shape.

3. internal arteriovenous fistula cannula needle according to claim 1, it is characterised in that: the puncture needle fixing seat (14) It is made of transparent material plastics, generally tubulose, proximal end is connected as one with puncture needle (8) sealing injection molding, is punctured Needle fixing seat (14) distal end is removably sealedly connected with cock cap (15), and cock cap (15) is hollow structure, and proximal end is equipped with waterproof Ventilated membrane (23), the waterproof ventilated membrane (23) close the proximal end of cock cap (15).

4. internal arteriovenous fistula cannula needle according to claim 1, it is characterised in that: be inside the remaining needle (4) The indwelling lumen road (16) of front and back perforation, and the proximal, side wall of remaining needle (4) offers the side being connected to indwelling lumen road (16) Hole (19).