An arteriovenous fistula indwelling needle

Abstract

The utility model discloses a kind of arteriovenous fistula indwelling needle, belong to indwelling needle technical field, this kind of arteriovenous fistula indwelling needle, including indwelling needle body, indwelling needle body includes indwelling catheter component, needle core component is inserted in the inside of indwelling catheter component, needle core component includes needle core, tail portion of needle core is fixedly connected with rear needle seat, the end of rear needle seat is limit connection with indwelling catheter component, the outside of needle core is provided with needle cap, needle cap is respectively with indwelling catheter component and needle core corresponding sleeve joint, the side of indwelling catheter component is continuously provided with infusion connector pipe, infusion connector pipe is externally sleeved with infusion clamp, needle cap is set outside needle core, after puncture needle cap can be clamped in the limiting ring of front needle seat, cooperate the telescopic structure of extension sleeve pipe, make needle core retract into pipe, avoid needle tip exposure, significantly reduce the risk of being pricked of medical staff and patient.

Description

Technical Field

[0001] This utility model relates to the field of indwelling needles, and more specifically, to an indwelling needle for arteriovenous fistulas. Background Technology

[0002] In clinical treatments such as hemodialysis, arteriovenous fistula (AVF) indwelling needles are commonly used to establish vascular access. Traditional AVF indwelling needles often have a relatively long steel needle. When withdrawing the needle after puncture, the lack of a protective sheath poses a risk of needlestick injury to medical personnel, and patients may also suffer needle tip injury. Furthermore, the lack of a clamp after successful puncture makes the indwelling needle prone to extravasation when connected to extracorporeal circulation, increasing the risk of infection for the patient. While conventional disposable AVF puncture needles (such as 16G and 17G specifications) are widely used, the aforementioned safety hazards and operational inconveniences have not been effectively resolved. How to invent an AVF indwelling needle to improve these problems has become an urgent issue for those skilled in the art. Utility Model Content

[0003] To overcome the above shortcomings, this utility model provides an arteriovenous fistula indwelling needle, which aims to improve the problem that traditional arteriovenous fistula indwelling needles have a long steel needle, and when the steel needle is withdrawn after puncture, medical staff face the risk of needle stick injury due to the lack of a protective sleeve, and patients may also be injured by the needle tip.

[0004] This invention is achieved as follows: an indwelling needle for arteriovenous fistulas, comprising...

[0005] The indwelling needle body includes an indwelling catheter assembly. A needle core assembly is inserted inside the indwelling catheter assembly. The needle core assembly includes a needle core. A rear needle seat is fixedly connected to the tail of the needle core. The end of the rear needle seat is limitedly connected to the indwelling catheter assembly. A needle cap is provided on the outside of the needle core. The needle cap is respectively sleeved with the indwelling catheter assembly and the needle core. An infusion connector tube is connected to one side of the indwelling catheter assembly. An infusion clamp is sleeved on the outside of the infusion connector tube.

[0006] In a preferred embodiment of this utility model, the needle core penetrates the indwelling tube of the indwelling catheter assembly, a front needle seat is sleeved on the middle part of the needle core, the front needle seat is locked and limited to the tail of the indwelling catheter assembly, and the front needle seat is locked and limited to the rear needle seat.

[0007] In a preferred embodiment of this utility model, a limiting block is fixedly connected to one side of the front needle seat, and a butterfly wing is fixedly connected to the outer side of the tail of the rear needle seat. The butterfly wing is limited and slidably engaged with the limiting block.

[0008] In a preferred embodiment of this utility model, a limiting ring is fixedly connected inside the front needle seat, the needle core passes through the limiting ring, and the end of the needle cap is limited and sleeved with the limiting ring.

[0009] In a preferred embodiment of this utility model, the outer side of the limiting block is arc-shaped, and the inner wall of the butterfly wing is provided with a groove that matches the outer wall of the limiting block.

[0010] In a preferred embodiment of this utility model, an extension sleeve is provided on the outside of the rear needle seat, one end of the extension sleeve is fixedly connected to the end of the rear needle seat, and the other end of the extension sleeve is fixedly connected to the back of the front needle seat.

[0011] In a preferred embodiment of this utility model, the extension sleeve is a frustum-shaped corrugated tube, and the corrugated tubes are stacked and extended.

[0012] In a preferred embodiment of this utility model, the infusion clamp includes an elastic clamp, which is sleeved onto the infusion connector tube.

[0013] In a preferred embodiment of this utility model, an upper liquid stop clamp and a lower liquid stop clamp are fixedly provided on the inner walls of both sides of the elastic clamp, and the upper liquid stop clamp and the lower liquid stop clamp abut against the corresponding pipe of the infusion connector.

[0014] In a preferred embodiment of this utility model, one end of the elastic clamp is fixedly connected with locking teeth, and the inner wall of the other end of the elastic clamp is fixedly provided with a limiting rack, and the locking teeth and the limiting rack are correspondingly engaged.

[0015] The beneficial effects of this utility model are as follows: The arteriovenous fistula indwelling needle obtained by the above design has optimized needlestick injury protection during use: a needle cap is set on the outside of the needle core, and after puncture, the needle cap can be locked onto the limiting ring of the front needle seat. With the telescopic structure of the extension sleeve, the needle core is retracted into the tube, avoiding the needle tip from being exposed, which significantly reduces the risk of needlestick injury to medical staff and patients.

[0016] Blood extravasation control: An infusion clamp is attached to the outside of the infusion connector tube. The elastic clamp abuts against the infusion tube through the upper and lower stop clamps. With the locking teeth and limiting toothed structure, the flow of fluid can be precisely controlled to prevent blood extravasation and reduce the risk of infection.

[0017] Improved ease of operation: The front and rear needle seats are slidably engaged by a limiting block and a sliding groove in the butterfly wing. Rotating the butterfly wing in the opposite direction can disengage the limiting block, and pulling the butterfly wing can retract the needle core into the extension cannula. The operation process is simplified, improving the efficiency of puncture and needle withdrawal for medical staff.

[0018] Enhanced structural stability: The extension tube adopts a frustum-shaped corrugated tube design, which can ensure the flexibility of needle core storage when stacked and extended, and ensure the relative position stability of the indwelling catheter assembly and needle core assembly through the fixed connection between the end and the front needle seat, thus avoiding component displacement during puncture. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a structural schematic diagram provided by an embodiment of the present utility model;

[0021] Figure 2 A schematic diagram of the disassembled structure provided for an embodiment of this utility model;

[0022] Figure 3 A schematic diagram of the needle core assembly structure provided for an embodiment of this utility model;

[0023] Figure 4 This is a schematic diagram of the infusion clamp structure provided for an embodiment of the present invention.

[0024] In the diagram: 100 - Indwelling needle body; 110 - Indwelling catheter assembly; 120 - Needle core assembly; 121 - Needle core; 122 - Front needle seat; 123 - Rear needle seat; 124 - Butterfly wing; 125 - Limiting ring; 126 - Extension sleeve; 127 - Limiting block; 128 - Needle cap; 130 - Infusion connector tube; 140 - Infusion clamp; 141 - Elastic clamp; 142 - Upper stopcock; 143 - Lower stopcock; 144 - Limiting rack; 145 - Locking teeth. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] Please see Figure 1 and Figure 2 This utility model provides a technical solution: an indwelling needle for arteriovenous fistulas, comprising...

[0027] The indwelling needle body 100 includes an indwelling catheter assembly 110. A needle core assembly 120 is inserted inside the indwelling catheter assembly 110. The needle core assembly 120 includes a needle core 121. A rear needle seat 123 is fixedly connected to the tail of the needle core 121. The end of the rear needle seat 123 is limitedly connected to the indwelling catheter assembly 110. A needle cap 128 is provided on the outside of the needle core 121. The needle cap 128 is connected to the indwelling catheter assembly 110. Corresponding to the needle core 121, one side of the indwelling catheter assembly 110 is connected to an infusion connector tube 130. An infusion clamp 140 is sleeved on the outside of the infusion connector tube 130. A needle cap 128 is provided on the outside of the needle core 121. After puncture, the needle cap 128 can be locked onto the limiting ring 125 of the front needle seat 122. With the telescopic structure of the extension tube 126, the needle core 121 is retracted into the tube, avoiding the needle tip from being exposed, which significantly reduces the risk of needle stick injuries to medical staff and patients.

[0028] Please see Figure 3 and Figure 4 The needle core 121 passes through the indwelling tube of the indwelling catheter assembly 110. A front needle seat 122 is sleeved in the middle of the needle core 121. The front needle seat 122 is locked and limited to the tail end of the indwelling catheter assembly 110. The front needle seat 122 is locked and limited to the rear needle seat 123. The front needle seat 122 is the same as the front end of a normal needle seat, and the rear needle seat 123 is the same as the rear end of a normal needle seat. A limiting block 127 is fixedly connected to one side of the front needle seat 122, and a butterfly wing 124 is fixedly connected to the outer side of the tail of the rear needle seat 123. The butterfly wing 124 is limited and slidably engaged with the limiting block 127. When the butterfly wing 124 is used for puncture, the front needle seat 122 and the rear needle seat 123 are tightly connected, and the puncture is stable and will not affect normal use. When the needle core 121 is removed, if the front needle seat 122 and the rear needle seat 123 are rotated in opposite directions by a certain angle, the front needle seat 122 and the rear needle seat 123 will be unlocked. At the same time, pulling the rear needle seat 123 outward will unfold the extension tube 126. The unfolded extension tube 126 will wrap around the needle core 121 to prevent the needle core 121 from being too long and the needle cap 128 from being difficult to insert. The extension tube 126 has a certain elasticity and can rotate to both sides by a certain angle.

[0029] A limiting ring 125 is fixedly connected inside the front needle holder 122. The needle core 121 passes through the limiting ring 125, and the end of the needle cap 128 is fitted with the limiting ring 125 for limiting. The outer side of the limiting block 127 is arc-shaped, and the inner wall of the butterfly wing 124 has a sliding groove that matches the outer wall of the limiting block 127. An extension sleeve 126 is sleeved on the outside of the rear needle holder 123. One end of the extension sleeve 126 is fixedly connected to the end of the rear needle holder 123, and the other end of the extension sleeve 126 is fixedly connected to the back of the front needle holder 122. The extension sleeve 126 is a frustum-shaped corrugated tube. The corrugated tubes are stacked and telescopically arranged, similar to the stacked part in the middle of a straw. When stacked, it occupies very little space, and when unfolded, it can be pulled out a long distance for convenient protection.

[0030] The infusion clamp 140 includes an elastic clamp 141, which is sleeved onto the infusion connector tube 130. An upper stop clamp 142 and a lower stop clamp 143 are fixedly installed on the inner walls of both sides of the elastic clamp 141, respectively, and these stop clamps abut against the tubes of the infusion connector tube 130. A locking tooth 145 is fixedly connected to one end of the elastic clamp 141, and a limiting rack 144 is fixedly installed on the inner wall of the other end of the elastic clamp 141. The locking tooth 145 and the limiting rack 144 are engaged. When the locking tooth 145 and the limiting rack 144 are locked, prying one end of the locking tooth 145 of the elastic clamp 141 outwards can release the lock and unlock the clamp.

[0031] Working principle: Puncture stage: The medical staff holds the butterfly wing 124, fixes the needle core 121 through the front needle seat 122 and the rear needle seat 123, and inserts the indwelling catheter assembly 110 into the patient's blood vessel. The needle core 121 passes through the indwelling catheter to guide the puncture.

[0032] Needle removal and storage: After successful puncture, when the needle core assembly 120 needs to be removed, the needle cap 128 is snapped into the limiting ring 125 inside the front needle seat 122 for protection.

[0033] Method 2: Rotate the butterfly wing 124 in the opposite direction to make the limiting block 127 disengage from the sliding groove inside the butterfly wing 124, pull the butterfly wing 124 outward, and drive the rear needle seat 123 and needle core 121 to retract into the extension sleeve 126 until the end of the needle core 121 abuts against the back of the front needle seat 122, thus completing the storage of the needle core 121.

[0034] Method 3: If the puncture needle is too long, rotate the butterfly wing 124 in the opposite direction to make the limiting block 127 disengage from the inner groove of the butterfly wing 124, pull the butterfly wing 124 outward, and drive the rear needle seat 123 and the needle core 121 to retract into the extension tube 126. At the same time, the needle cap 128 and the limiting ring 125 are engaged to complete the storage of the needle core 121.

[0035] Infusion control: During infusion, loosen the elastic clamp 141 of the infusion clamp 140, and the liquid flows through the infusion connector tube 130; when it is necessary to stop the infusion or prevent blood extravasation, squeeze the elastic clamp 141, so that the upper stop clamp 142 and the lower stop clamp 143 squeeze the infusion tube, and at the same time, the locking teeth 145 and the limiting rack 144 are engaged and fixed to achieve the closure of the passage.

[0036] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An indwelling needle for arteriovenous fistulas, characterized in that, include The indwelling needle body includes an indwelling catheter assembly. A needle core assembly is inserted inside the indwelling catheter assembly. The needle core assembly includes a needle core. A rear needle seat is fixedly connected to the tail of the needle core. The end of the rear needle seat is limitedly connected to the indwelling catheter assembly. A needle cap is provided on the outside of the needle core. The needle cap is respectively sleeved with the indwelling catheter assembly and the needle core. An infusion connector tube is connected to one side of the indwelling catheter assembly. An infusion clamp is sleeved on the outside of the infusion connector tube.

2. The arteriovenous fistula indwelling needle as described in claim 1, characterized in that: The needle core penetrates the indwelling tube of the indwelling catheter assembly. A front needle seat is sleeved on the middle part of the needle core. The front needle seat is locked and limited to the tail of the indwelling catheter assembly. The front needle seat is locked and limited to the rear needle seat.

3. The arteriovenous fistula indwelling needle as described in claim 2, characterized in that: A limiting block is fixedly connected to one side of the front needle seat, and a butterfly wing is fixedly connected to the outer side of the tail of the rear needle seat. The butterfly wing is limited and slidably engaged with the limiting block.

4. The arteriovenous fistula indwelling needle as described in claim 2, characterized in that: A limiting ring is fixedly connected inside the front needle holder, the needle core passes through the limiting ring, and the end of the needle cap is limited and sleeved with the limiting ring.

5. The arteriovenous fistula indwelling needle as described in claim 3, characterized in that: The outer side of the limiting block is arc-shaped, and the inner wall of the butterfly wing has a groove that matches the outer wall of the limiting block.

6. The arteriovenous fistula indwelling needle as described in claim 5, characterized in that: The rear needle seat is externally fitted with an extension sleeve, one end of which is fixedly connected to the end of the rear needle seat, and the other end of which is fixedly connected to the back of the front needle seat.

7. The arteriovenous fistula indwelling needle as described in claim 6, characterized in that: The extension sleeve is a frustum-shaped corrugated tube, which is stacked and extended.

8. The arteriovenous fistula indwelling needle as described in claim 1, characterized in that: The infusion clamp includes an elastic clamp, which is sleeved onto the infusion connector tube.

9. The arteriovenous fistula indwelling needle as described in claim 8, characterized in that: The inner walls on both sides of the elastic clamp are respectively fixedly provided with an upper liquid stop and a lower liquid stop, and the upper liquid stop and the lower liquid stop are respectively abutted against the infusion connector pipe.

10. The arteriovenous fistula indwelling needle as described in claim 8, characterized in that: One end of the elastic clamp is fixedly connected to a locking tooth, and the inner wall of the other end of the elastic clamp is fixedly provided with a limiting tooth, and the locking tooth and the limiting tooth are engaged accordingly.

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