Anti-retraction needle for internal fistula indwelling needle

Abstract

The utility model relates to the field of medical apparatus and instruments. A needle-retraction-preventing internal fistula indwelling needle, including internally and externally arranged needle core and sleeve soft needle, the needle core includes the needle handle and the needle body connected in order from front to back axially, the sleeve soft needle includes the puncture part and the closable part connected in order from front to back axially, the rear end of closable part is detachably connected with a heparin cap, the heparin cap is rotatably connected with the needle handle, and the heparin cap and the needle handle form a space for accommodating the needle-stick-prevention protective sleeve, the outer wall of heparin cap is fixed with the clamping protrusion, the needle handle is provided with the rotating sleeve of the local partial periphery of heparin cap, the inner wall of rotating sleeve is provided with the clamping groove, the clamping groove includes the insertion slot for axially inserting the clamping protrusion and the limiting slot for axially limiting the clamping protrusion, and the closable part is fixed with the clamping structure. The utility model realizes the problem of preventing the needle core from withdrawing in advance through the rotatable connection of heparin cap and needle handle.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, specifically to an indwelling needle for an arteriovenous fistula. Background Technology

[0002] Arteriovenous fistula (AVF) catheters are medical devices that play a crucial protective role in the vascular access (autogenous arteriovenous fistula and artificial AVF) for maintenance hemodialysis patients.

[0003] Instructions for use: Disinfect the vascular access puncture site >15CM, strictly adhere to aseptic technique, and insert the steel needle with the bevel of the needle tip facing upward at 30°-45°. After seeing blood return, lower the angle and insert the needle a little further. When blood return appears in the cannula, fix the cannula and slowly push the cannula completely into the blood vessel, while completely withdrawing the needle core and securing it properly.

[0004] Traditional arteriovenous fistula (AVF) catheters lack a core-retraction prevention feature. Compared to autogenous arteriovenous fistulas, AVFs have thicker and harder walls. When using a traditional catheter to puncture an AVF, nurses need to apply considerable force to penetrate the vessel wall. This makes the core in the traditional catheter prone to premature retraction due to the pressure of the insertion, leading to puncture failure, increased patient discomfort, wasted catheter costs, and damage to the artificial blood vessel. Utility Model Content

[0005] In view of the problems existing in the prior art, this utility model provides an anti-retraction fistula indwelling needle to solve at least one of the above technical problems.

[0006] To achieve the above objectives, this utility model provides an anti-retraction fistula indwelling needle, comprising a needle core disposed inside and outside and a cannula soft needle, characterized in that the needle core comprises a needle body and a needle handle connected sequentially from front to back in the axial direction;

[0007] The cannula includes a puncture section and a clampable section connected sequentially from front to back in an axial direction, and a heparin cap is detachably connected to the rear end of the clampable section.

[0008] The heparin cap is rotatably engaged with the needle handle, and a space is formed between the heparin cap and the needle handle to accommodate a needle-puncture protective sleeve.

[0009] The outer wall of the heparin cap is fixed with a snap-fit ​​protrusion;

[0010] The needle handle is provided with a rotating sleeve that is sleeved on the partial periphery of the heparin cap. The inner wall of the rotating sleeve is provided with a snap-fit ​​groove. The snap-fit ​​groove includes an insertion groove for axially inserting the snap-fit ​​protrusion and a limiting groove for axially limiting the snap-fit ​​protrusion. The insertion groove and the limiting groove are aligned to form an L-shaped snap-fit ​​groove.

[0011] The clampable part is fixed with a clamping structure.

[0012] This invention prevents premature needle core ejection by rotating and locking the tail end connector with the needle handle. Additionally, the invention features a clamping structure in the clamping part, facilitating the clamping of the cannula needle.

[0013] More preferably, the clampable part includes an inner flexible tube and an outer rigid tube, the outer rigid tube having an operating port, an elastic pressing piece connected to the outer rigid tube, the elastic pressing piece having a pressing part for squeezing the inner flexible tube through the operating port, and the outer rigid tube having a locking member for locking the elastic pressing piece.

[0014] It facilitates the clamping of the inner hose by adjusting the engagement of the elastic pressing plate and the snap-fit ​​component.

[0015] More preferably, the front end of the outer rigid tube includes a tapered fixing sleeve, and a silicone wing is connected to the opposite side of the tapered fixing sleeve.

[0016] It facilitates gripping by bringing the silicone blades together.

[0017] More preferably, the anti-needle puncture protective sleeve includes a detachably connected end cap and a sleeve body. The end cap has a perforation for the needle to pass through. A fixed magnet is fixed on the inner side of the end cap on one side of the perforation, and a movable magnet for sealing the perforation is slidably connected on the inner side of the end cap on the other side of the perforation.

[0018] When the movable magnet magnetically attracts the fixed magnet, the movable magnet blocks the perforation;

[0019] When the needle is inserted into the hole, the movable magnet and the fixed magnet are located on opposite sides of the needle.

[0020] More preferably, a guide rail for slidingly connecting the movable magnet is fixed to the inner side of the end cap.

[0021] More preferably, the needle body is covered with a metal ring, which is located within the space enclosed by the end cap and the sleeve body;

[0022] The needle body is provided with opposing indentations, and the maximum outer diameter of the needle body at the indentation is greater than the inner diameter of the metal ring;

[0023] The metal ring is located at the rear end of the needle body where the indentation is provided;

[0024] The axial length from the needle tip to the indentation is less than the axial length of the anti-needle puncture protective sleeve.

[0025] It facilitates the fixation and securement of the needle tip within the anti-needle-puncture protective sleeve.

[0026] Compared with the prior art, the beneficial effects of this utility model are:

[0027] This invention prevents premature needle core ejection by rotating and locking the heparin cap to the needle handle. Additionally, the invention features a clamping structure in the clamping part, facilitating the clamping capability of the cannula needle.

[0028] The needle tip is fixed and limited by the anti-needle-puncture protective sleeve. Attached Figure Description

[0029] Figure 1 This is a cross-sectional view of a specific embodiment 1 of the present utility model;

[0030] Figure 2 This is a schematic diagram of the structure of the outer rigid tube section in a specific embodiment 1 of this utility model;

[0031] Figure 3 This is a cross-sectional view of the needle handle in a specific embodiment 1 of this utility model;

[0032] Figure 4 This is a cross-sectional view of the needle body in a specific embodiment 1 of this utility model, showing the needle tip being fixed within an anti-needle puncture protective sleeve.

[0033] In the diagram: 11 is the needle body, 12 is the needle handle, 21 is the puncture part, 22 is the clampable part, 23 is the heparin cap, 24 is the anti-needle-puncture protective sleeve, 121 is the snap-fit ​​groove, 221 is the elastic pressing piece, 222 is the snap-fit ​​component, 223 is the operating port, 224 is the silicone wing, 241 is the end cap, 242 is the fixed magnet, 243 is the movable magnet, 244 is the sleeve body, and 245 is the metal ring. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings.

[0035] See Figures 1 to 4Specific Embodiment 1: An indwelling needle for an arteriovenous fistula with anti-retraction features includes a needle core and a cannula soft needle arranged internally and externally. The needle core includes a needle body 11 and a needle handle 12 connected sequentially from front to back in the axial direction. The cannula soft needle includes a puncture part 21 and a clampable part 22 connected sequentially from front to back in the axial direction. A heparin cap 23 is detachably connected to the rear end of the clampable part 22. The heparin cap 23 is rotatably engaged with the needle handle 12, and a space for accommodating an anti-needle-puncture protective sleeve 24 is formed between the heparin cap 23 and the needle handle 12. A clamping protrusion is fixed on the outer wall of the heparin cap 23. The needle handle 12 is provided with a rotating sleeve that is partially sleeved on the periphery of the heparin cap 23. The inner wall of the rotating sleeve is provided with a clamping groove 121. The clamping groove 121 includes an insertion groove for axially inserting the clamping protrusion and a limiting groove for axially limiting the clamping protrusion. The insertion groove and the limiting groove are aligned to form an L-shaped clamping groove 121. The clampable part 22 is fixed with a clamping structure. This invention prevents premature needle core ejection by rotating and locking the heparin cap to the needle handle 12. Simultaneously, the invention features a clamping structure in the clampable part 22, facilitating the clamping of the cannula needle. The structure of the heparin cap is prior art and will not be described in detail in this application. The heparin cap is threaded to the rear end of the clampable part.

[0036] The clamping part 22 includes an inner flexible tube and an outer rigid tube. An operating port 223 is provided on the outer rigid tube, and an elastic pressing piece 221 is connected to it. The elastic pressing piece 221 has a pressing part for squeezing the inner flexible tube through the operating port 223. A locking member 222 for engaging the elastic pressing piece 221 is provided on the outer rigid tube. This allows for clamping of the inner flexible tube by controlling whether the elastic pressing piece 221 and the locking member 222 are engaged. The operating port is rectangular. The elastic pressing piece and the locking member are fixed to the front and rear sides of the operating port, respectively. The elastic pressing piece and the locking member have matching locking structures. The pressing part is an arc-shaped, concave structure. The puncture part is a flexible tube structure, and the puncture part is fixedly connected to the inner flexible tube to form a single flexible tube structure.

[0037] The head end of the outer rigid tube includes a tapered retaining sleeve, and silicone flaps 224 are connected to the opposite side of the tapered retaining sleeve. This facilitates gripping by closing the silicone flaps 224.

[0038] The tapered retaining sleeve is fixedly connected to the outer rigid tube.

[0039] The anti-needle-puncture protective sleeve 24 includes a detachably connected end cap 241 and a sleeve body 244. The end cap 241 has a through hole for the needle 11 to pass through. A fixed magnet 242 is fixed to the inner side of the end cap 241 on one side of the through hole, and a movable magnet 243 for sealing the through hole is slidably connected to the inner side of the end cap 241 on the other side of the through hole. When the movable magnet 243 magnetically attracts the fixed magnet 242, the movable magnet 243 seals the through hole. When the needle 11 is inserted into the through hole, the movable magnet 243 and the fixed magnet 242 are located on opposite sides of the needle 11. A guide rail for slidably connecting the movable magnet is fixed to the inner side of the end cap. A through hole for slidably connecting the needle is provided on the side of the sleeve body away from the end cap. The inner diameter of the through hole matches the inner diameter of the through hole. The end cap and the sleeve body can be engaged with matching snaps and slots, or detachably connected by threads.

[0040] A metal ring 245 is fitted over the needle body 11, located within the space enclosed by the end cap 241 and the sleeve 244. The needle body 11 has opposing indentations, with the outer diameter of the needle body 11 at the indentation being larger than the inner diameter of the metal ring 245. The metal ring 245 is located at the rear end of the indentation on the needle body 11. The axial length from the needle tip to the indentation on the needle body 11 is less than the axial length of the anti-puncture protective sleeve 24. This facilitates the fixation and positioning of the needle tip within the anti-puncture protective sleeve 24. The inner diameter of the metal ring matches the inner diameter of the through hole.

[0041] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A fistula indwelling needle with anti-retraction capability, comprising an inner and outer needle core and a cannula soft needle, characterized in that, The needle core includes a needle body and a needle handle connected sequentially from front to back in an axial direction; The cannula includes a puncture section and a clampable section connected sequentially from front to back in an axial direction, and a heparin cap is detachably connected to the rear end of the clampable section. The heparin cap is rotatably engaged with the needle handle, and a space is formed between the heparin cap and the needle handle to accommodate a needle-puncture protective sleeve. The outer wall of the heparin cap is fixed with a snap-fit ​​protrusion; The needle handle is provided with a rotating sleeve that is sleeved on the partial periphery of the heparin cap. The inner wall of the rotating sleeve is provided with a snap-fit ​​groove. The snap-fit ​​groove includes an insertion groove for axially inserting the snap-fit ​​protrusion and a limiting groove for axially limiting the snap-fit ​​protrusion. The insertion groove and the limiting groove are aligned to form an L-shaped snap-fit ​​groove. The clampable part is fixed with a clamping structure.

2. The arteriovenous fistula indwelling needle according to claim 1, characterized in that: The clampable part includes an inner flexible tube and an outer rigid tube. The outer rigid tube has an operating port and an elastic pressing piece is connected to it. The elastic pressing piece is provided with a pressing part for squeezing the inner flexible tube through the operating port. The outer rigid tube is provided with a snap-fit ​​member for snapping the elastic pressing piece.

3. The arteriovenous fistula indwelling needle according to claim 2, characterized in that: The front end of the outer rigid tube includes a tapered fixing sleeve, and a silicone wing is connected to the opposite side of the tapered fixing sleeve.

4. The arteriovenous fistula indwelling needle according to claim 1, characterized in that: The anti-needle puncture protective sleeve includes a detachably connected end cap and a sleeve body. The end cap has a through hole for the needle to pass through. A fixed magnet is fixed on the inner side of the end cap on one side of the through hole, and a movable magnet for sealing the through hole is slidably connected on the inner side of the end cap on the other side of the through hole. When the movable magnet magnetically attracts the fixed magnet, the movable magnet blocks the perforation; When the needle is inserted into the hole, the movable magnet and the fixed magnet are located on opposite sides of the needle.

5. The arteriovenous fistula indwelling needle according to claim 4, characterized in that: The inner side of the end cap is fixed with a guide rail that is slidably connected to the movable magnet.

6. The arteriovenous fistula indwelling needle according to claim 4, characterized in that: The needle body is fitted with a metal ring, which is located within the space enclosed by the end cap and the sleeve. The needle body is provided with opposing indentations, and the maximum outer diameter of the needle body at the indentation is greater than the inner diameter of the metal ring; The metal ring is located at the rear end of the needle body where the indentation is provided; The axial length from the needle tip to the indentation is less than the axial length of the anti-needle puncture protective sleeve.

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