CN221513056U - Long-term indwelling catheters and insertion devices for arteriovenous fistulas - Google Patents

Abstract

The utility model relates to the technical field of medical equipment, in particular to a long-term indwelling tube and an imbedding device for arteriovenous internal fistula, wherein the long-term indwelling tube for arteriovenous internal fistula comprises: a catheter body adapted to be subcutaneously and implanted into an arteriovenous fistula of a dialysis patient; the catheter base is arranged at the first end of the catheter body in the length direction; the catheter tip is arranged at the second end of the catheter body in the length direction, and a first continuous cavity is formed among the catheter base, the catheter body and the catheter tip; a kaff disposed on the outer circumferential surface of the catheter between the first end and the second end; and a fixing wing which is arranged on the outer peripheral surface of the catheter between the catheter base and the kafu and is suitable for being placed outside the skin to fix the catheter body. The long-term indwelling tube for arteriovenous internal fistula, provided by the embodiment of the utility model, can solve the technical problems caused by a conventional method for establishing extracorporeal circulation of blood by puncturing an internal fistula vein with a puncture needle.

Description

Long-term indwelling catheters and insertion devices for arteriovenous fistulas

Technical Field

The utility model relates to the technical field of medical devices, in particular to a long-term indwelling tube and an insertion device for arteriovenous fistula.

Background Art

Arteriovenous fistula is the most commonly used permanent vascular access for hemodialysis. The conventional method of using fistula to establish extracorporeal circulation for hemodialysis is to puncture the fistula vein with two puncture needles, remove the needle and apply pressure to stop bleeding after dialysis. This method has at least one of the following technical problems:

1. Some patients have short fistula veins and cannot provide a long enough blood vessel to meet long-term repeated punctures;

2. Some patients have deep fistula veins and need shallow placement surgery before puncture. Some patients have veins that are not suitable for puncture and need surgical transposition. However, shallow placement surgery and transposition surgery are very traumatic and have many complications.

3. Repeated and long-term puncture of internal fistulas can easily lead to stenosis of the puncture site, resulting in occlusion of the internal fistula;

4. Fistula puncture depends on the repair and healing ability of the skin and blood vessels. Repeated and long-term punctures are prone to complications such as local aneurysms and vascular ruptures, resulting in a reduction in the puncturable area and a decrease in the service life of the fistula.

5. It is difficult for some patients to stop bleeding after the needle is removed, and delayed bleeding and other problems may occur. For patients with bleeding risks (such as thrombocytopenia, hemophilia, and those using anticoagulants, etc.), the risk of bleeding after puncture is high;

6. The pain caused by puncture affects the patient's quality of life.

Utility Model Content

In response to at least one of the above problems, the purpose of the present utility model is to provide a long-term indwelling catheter and insertion device for arteriovenous fistula, which can solve the technical problems caused by the conventional method of establishing extracorporeal hemodialysis circulation by puncturing the fistula vein with two puncture needles.

In order to achieve the above purpose, the utility model adopts the following technical solutions:

The first aspect of the utility model provides a long-term indwelling catheter for an arteriovenous fistula, comprising: a catheter body, suitable for being placed subcutaneously and inserted into the arteriovenous fistula of a dialysis patient; a catheter base, arranged at a first end of the catheter body in the length direction; a tube tip, arranged at a second end of the catheter body in the length direction, a first continuous cavity being formed within the catheter base, the catheter body and the tube tip; a clamp, arranged on the outer peripheral surface of the catheter body between the first end and the second end; and a fixing wing, arranged on the outer peripheral surface of the catheter body between the catheter base and the clamp, and suitable for being indwelled outside the skin to fix the catheter body.

Optionally, in the long-term indwelling catheter for arteriovenous fistula provided in at least one embodiment of the present invention, the catheter body is configured to be composed of a medical polymer material, and is soft and elastic.

Optionally, in the long-term indwelling catheter for arteriovenous fistula provided in at least one embodiment of the present invention, the catheter base is suitable for connecting to a syringe or a medical Luer head.

Optionally, in the long-term indwelling catheter for arteriovenous fistula provided in at least one embodiment of the present utility model, the tube tip is integrally connected to the catheter body.

The second aspect of the utility model provides an insertion device for inserting any of the above-mentioned long-term indwelling catheters for arteriovenous fistulas, the insertion device comprising: a puncture trocar, suitable for puncturing a blood vessel and having a detachable outer sleeve; a dilator, suitable for being detachably plugged into the first continuous cavity through the catheter base and forming a second continuous cavity therein; and a guide wire, suitable for penetrating the first continuous cavity and the second continuous cavity.

Optionally, in the insertion device provided in at least one embodiment of the present invention, the guide wire includes a guide segment, a support segment and a soft segment, the guide segment and the soft segment are respectively located at two ends of the guide wire in the length direction, the support segment is located between the guide segment and the soft segment, and the guide segment and the soft segment are softer than the support segment.

Optionally, in the insertion device provided in at least one embodiment of the present invention, the dilator includes a needle seat buckle, a dilator body and a tip connected in sequence along the length direction, the needle seat buckle is adapted to the catheter base, the outer diameter of the tip gradually decreases in the direction away from the dilator body, and the outer diameters of the dilator body and the tip are less than or equal to the minimum aperture of the tube tip.

Optionally, in the insertion device provided in at least one embodiment of the present invention, the inner surface of the catheter base is smoothly arranged.

Optionally, in the insertion device provided in at least one embodiment of the present invention, the cavity wall surfaces of the first continuous cavity are all smoothly arranged.

Optionally, in the insertion device provided in at least one embodiment of the present invention, the cavity wall surfaces of the second continuous cavity are all smoothly arranged.

The utility model adopts the above technical solution, which has at least the following advantages:

During hemodialysis, the long-term indwelling tube for arteriovenous fistula provided by the utility model can be directly connected to the dialysis line to quickly establish extracorporeal circulation. And the long-term indwelling tube has at least the following beneficial effects:

1. Avoid fistula puncture to reduce the pain and bleeding risk caused by frequent puncture;

2. Reduce complications such as puncture site stenosis, aneurysm, and tissue rupture and bleeding caused by repeated punctures, and extend the service life of internal fistulas;

3. For patients with bleeding risk or taking anticoagulants, bleeding complications caused by puncture can be avoided;

4. It can avoid puncture difficulties for patients with short or deep fistula puncture segments and extensive aneurysm formation;

5. For patients with abnormal or too deep fistulas, it can avoid the need for superficial fistula placement and transposition surgeries;

6. For cases with combined internal fistula vascular stenosis and other lesions, angiography and interventional intervention can be conveniently performed directly through the long-term indwelling catheter;

7. The long-term indwelling catheter can be used as a venous access for patients' daily medical measures such as infusion.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structures of a long-term indwelling catheter and an insertion device for an arteriovenous fistula provided by at least one embodiment of the present invention;

FIG2 is a schematic diagram of the combined structure of a long-term indwelling catheter and a dilator of an insertion device for an arteriovenous fistula provided by at least one embodiment of the present invention.

Markings in the accompanying drawings:

1 is the puncture trocar;

2 is the guide wire;

21 is the guide segment;

22 is the support segment;

23 is the soft segment;

3 is a long-term indwelling tube;

31 is a catheter base;

32 for fixed wing;

33 is a catheter body;

34 for Kraft;

35 is the tube tip;

4 is the expander.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the system or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "assembly", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

At least one embodiment of the utility model provides a long-term indwelling catheter and an insertion device for an arteriovenous fistula, which can solve the technical problems caused by the conventional method of puncturing the fistula vein with a puncture needle to establish extracorporeal hemodialysis circulation.

Below, the long-term indwelling catheter and the insertion device for arteriovenous fistula provided by the embodiment of the utility model are described in detail with reference to the accompanying drawings.

It should be noted that the long-term indwelling catheter and insertion device for arteriovenous fistula provided in the embodiment of the utility model can be used as a long-term indwelling catheter assembly as a whole, that is, the long-term indwelling catheter assembly includes the long-term indwelling catheter and insertion device for arteriovenous fistula provided in the embodiment of the utility model.

It is worth pointing out that, in some cases, the long-term indwelling catheter and insertion device for arteriovenous fistula can also be used for long-term drainage and fluid infusion of other body cavities.

1 and 2 , optionally, in at least one embodiment of the present invention, the long-term indwelling tube 3 for arteriovenous fistula includes: a catheter body 33 , a catheter base 31 , a tube tip 35 , a clamp 34 and a fixing wing 32 .

Furthermore, the catheter body 33 is suitable for being placed subcutaneously and inserted into the arteriovenous fistula of the dialysis patient, and the catheter body 33 is used to establish a channel for extracorporeal circulation of hemodialysis through the arteriovenous fistula.

Furthermore, the catheter base 31 is disposed at a first end of the catheter body 33 in the length direction.

Furthermore, the tube tip 35 is disposed at the second end of the catheter body 33 in the length direction, and a first continuous cavity is formed in the catheter base 31, the catheter body 33 and the tube tip 35. It can be understood that the tube tip 35 can make the catheter body 33 easy to be inserted into the human body. Specifically, one end of the tube tip 35 is connected to the catheter body 33, and the other end forms an orifice, and the outer diameter of the tube tip 35 gradually decreases in the direction away from the catheter body 33.

Furthermore, the cuff 34 is disposed on the outer peripheral surface of the catheter body 33 between the first end and the second end. After the cuff 34 is placed subcutaneously, fibrous tissue grows into and is fixed to the cuff 34 to form a mechanical barrier to prevent infection and facilitate long-term retention.

Furthermore, the fixing wing 32 is disposed on the outer peripheral surface of the catheter body 33 between the catheter base 31 and the clamp 34 , and is suitable for being left outside the skin to fix the catheter body 33 .

When performing hemodialysis, the long-term indwelling tube 3 for arteriovenous fistula in the above embodiment can be directly connected to the dialysis line to quickly establish extracorporeal circulation, and the long-term indwelling tube 3 has at least the following beneficial effects:

1. Avoid fistula puncture to reduce the pain and bleeding risk caused by frequent puncture;

2. Reduce complications such as puncture site stenosis, aneurysm, and tissue rupture and bleeding caused by repeated punctures, and extend the service life of internal fistulas;

3. For patients with bleeding risk or taking anticoagulants, bleeding complications caused by puncture can be avoided;

4. It can avoid puncture difficulties for patients with short or deep fistula puncture segments and extensive aneurysm formation;

5. For patients with abnormal or too deep fistulas, it can avoid the need for superficial fistula placement and transposition surgeries;

6. For cases with combined internal fistula vascular stenosis and other lesions, angiography and interventional intervention can be conveniently performed directly through the long-term indwelling tube 3;

7. The long-term indwelling tube 3 can be used as a venous access for daily medical measures such as infusion of the patient.

Optionally, in at least one embodiment of the present invention, the catheter body 33 is configured to be made of a medical polymer material, which is soft and elastic and not easily blocked by bending.

Optionally, in at least one embodiment of the present invention, the catheter base 31 is suitable for connecting a syringe or a medical Luer head. Further, the syringe can be a standard syringe.

Optionally, in at least one embodiment of the present invention, the tube tip 35 is integrally connected to the catheter body 33 .

Optionally, in at least one embodiment of the present invention, the insertion device is used to insert any of the above-mentioned long-term indwelling tubes 3 for arteriovenous fistula into the human body, and the insertion device includes: a puncture trocar 1, a dilator 4 and a guide wire 2.

Furthermore, the puncture trocar 1 is suitable for puncturing a blood vessel and has a detachable outer sleeve.

Furthermore, the expander 4 is suitable for being plugged into the first continuous cavity via the catheter base 31, and the expander 4 and the first continuous cavity are detachable. A second continuous cavity is formed in the expander 4.

Furthermore, the guide wire 2 is suitable for passing through the first continuous cavity and the second continuous cavity, that is, both the long-term indwelling tube 3 and the dilator 4 can allow the guide wire 2 to pass through.

Optionally, in at least one embodiment of the present invention, the guide wire 2 includes a guide segment 21, a support segment 22 and a soft segment 23, the guide segment 21 and the soft segment 23 are respectively located at the two ends of the length direction of the guide wire 2, the support segment 22 is located between the guide segment 21 and the soft segment 23, and the guide segment 21 and the soft segment 23 are softer than the support segment 22.

Optionally, in at least one embodiment of the present invention, the dilator 4 includes a needle seat buckle, a dilator body and a tip portion which are sequentially connected along the length direction.

Furthermore, the needle hub buckle is adapted to the catheter base 31 , and the outer diameter of the tip gradually decreases in the direction away from the dilator body, and the outer diameters of the dilator body and the tip are less than or equal to the minimum aperture of the tube tip 35 .

Further, after the dilator 4 is inserted into the first continuous cavity from the catheter base 31, the tip of the dilator 4 protrudes outside the tube tip 35, and the long-term indwelling tube 3 can be pushed forward along the length direction of the dilator 4 (i.e., along the tip of the dilator 4). The inner cavity of the outer sleeve of the puncture trocar 1 matches the guide wire 2, and the second continuous cavity of the dilator 4 matches the guide wire 2.

Optionally, in at least one embodiment of the present invention, the inner surface of the catheter base 31 is smoothly configured to facilitate the insertion of the dilator 4 .

Optionally, in at least one embodiment of the present invention, the wall surfaces of the first continuous cavity are all smooth, that is, the inner surface of the catheter base 31, the inner surface of the catheter body 33 and the inner surface of the tube tip 35 are all smooth.

Optionally, in at least one embodiment of the present invention, the wall surfaces of the second continuous cavity are all smoothly arranged, that is, the inner surface of the needle seat buckle, the inner surface of the dilator body and the inner surface of the tip are all smoothly arranged.

Exemplarily, the following describes the use of the long-term indwelling tube 3 and the insertion device for arteriovenous fistula in at least one embodiment of the utility model:

After the patient completes routine disinfection, draping and anesthesia, two 3-4 mm small incisions A and B are made near the vein of the fistula body. The distance between incision A and incision B is about 2 cm. The puncture cannula needle 1 is used to puncture the blood vessel through incision A, and then the outer sleeve of the puncture cannula needle 1 is pushed in, and then the guide wire 2 is inserted through the outer sleeve.

The mosquito forceps are inserted through incision B and extended from incision A to establish a short subcutaneous tunnel. The guide section 21 and the support section 22 of the guide wire 2 are pushed into the blood vessel. The mosquito forceps clamp the soft section 23 at the tail of the guide wire 2, and then the guide wire 2 is pulled out from incision B, so that the support section 22 of the guide wire 2 passes through incision B, incision A and the entrance of the blood vessel. After the long-term indwelling tube 3 for arteriovenous fistula is assembled with the dilator 4, it is pushed from incision B along the guide wire 2 to enter the blood vessel, and pushed until the long-term indwelling tube clamp 34 is pushed into the subcutaneous tunnel between incision A and incision B, and then the guide wire 2 and the dilator 4 are removed, and the long-term indwelling tube 3 is retained.

Then, operations such as flushing with heparin saline, sealing the tube with a heparin cap, closing the skin incision, and suturing the fixed wing 32 are performed.

Optionally, two long-term indwelling tubes 3 can be placed in the same arteriovenous fistula, and can be connected to a dialysis line for hemodialysis when necessary.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (10)

1. A long-term indwelling catheter for arteriovenous fistula, comprising: A catheter body, adapted to be placed subcutaneously and inserted into an arteriovenous fistula in a dialysis patient; A catheter base, arranged at a first end of the catheter body in the length direction; A tube tip is arranged at the second end of the catheter body in the length direction, and a first continuous cavity is formed in the catheter base, the catheter body and the tube tip; A clave disposed on a peripheral surface of the catheter body between the first end and the second end; and The fixing wing is arranged on the outer peripheral surface of the catheter body between the catheter base and the clamp, and is suitable for being left outside the skin to fix the catheter body. 2. The long-term indwelling catheter for arteriovenous fistula according to claim 1, characterized in that: The catheter body is configured to be made of medical polymer material and is soft and elastic. 3. The long-term indwelling catheter for arteriovenous fistula according to claim 2, characterized in that: The catheter base is suitable for connecting a syringe or a medical Luer head. 4. The long-term indwelling catheter for arteriovenous fistula according to any one of claims 1 to 3, characterized in that: The tube tip is integrally connected to the catheter body. 5. An insertion device, characterized in that it is used for inserting a long-term indwelling catheter for an arteriovenous fistula according to any one of claims 1 to 4, and the insertion device comprises: A puncture trocar needle, suitable for puncturing a blood vessel and having a detachable outer sleeve; a dilator adapted to be detachably inserted into the first continuous cavity through the catheter base and to form a second continuous cavity therein; and A guide wire is suitable for passing through the first continuous cavity and the second continuous cavity. 6. The insertion device according to claim 5, characterized in that: The guide wire comprises a guide section, a support section and a soft section, wherein the guide section and the soft section are respectively located at two ends of the guide wire in the length direction, and the support section is located between the guide section and the soft section, and the guide section and the soft section are softer than the support section. 7. The insertion device according to claim 6, characterized in that: The dilator includes a needle seat buckle, a dilator body and a tip connected in sequence along the length direction, the needle seat buckle is adapted to the catheter base, the outer diameter of the tip gradually decreases in the direction away from the dilator body, and the outer diameters of the dilator body and the tip are less than or equal to the minimum aperture of the tube tip. 8. The insertion device according to claim 7, characterized in that: The inner surface of the catheter base is arranged to be smooth. 9. The insertion device according to claim 8, characterized in that: The cavity wall surfaces of the first continuous cavity are all smoothly arranged. 10. The insertion device according to claim 8 or 9, characterized in that: The cavity wall surfaces of the second continuous cavity are all smooth.