CN106938064B

CN106938064B - Puncture hemodialysis catheter

Info

Publication number: CN106938064B
Application number: CN201710121796.XA
Authority: CN
Inventors: 毕国善; 熊国祚; 戴先鹏; 申昕; 邓礼明; 陈洁; 胡兵兵
Original assignee: Second Hospital University Of South China
Current assignee: Second Hospital University Of South China
Priority date: 2017-03-02
Filing date: 2017-03-02
Publication date: 2023-11-24
Anticipated expiration: 2037-03-02
Also published as: CN106938064A

Abstract

The utility model provides a hemodialysis pipe that can puncture, relates to medical equipment technical field, and it includes the pipe main part that is used for keeping somewhere in the vein and is used for keeping somewhere the repeatedly puncture pipe of subcutaneous, but the front end of repeatedly puncture pipe is connected in the pipe main part and communicates with each other with the inside cavity of pipe main part, but the end closure of repeatedly puncture pipe, but still be equipped with on the repeatedly puncture pipe and be used for carrying out spacing fixed pipe fixed knot to it subcutaneously. Compared with the existing hemodialysis catheter, the whole structure of the puncturable hemodialysis catheter is simpler, the puncture tube can be repeatedly fixed in the subcutaneous tunnel after operation, the port of the skin surface cannula can be sutured by threads, and the catheter is completely buried under the skin without exposing in-vitro parts, so that the infection rate is greatly reduced, the probability of displacement of the catheter caused by collision/pulling of the catheter due to daily wearing and taking-off of clothing by a patient is reduced, the convenience of daily activities of the patient is greatly improved, and the whole dialysis catheter has no external part, is good in aesthetic property and is also beneficial to relieving psychological burden of the patient.

Description

Puncture hemodialysis catheter

Technical Field

The application relates to the technical field of medical equipment, in particular to a puncturable hemodialysis catheter.

Background

In hemodialysis, a dialysis catheter is a commonly used medical device. The common dialysis catheter is a dual-cavity catheter shown in fig. 1, and comprises a dual-cavity catheter main body 1 (a partition board is arranged in a tube to divide an inner cavity into two mutually independent cavity channels, one cavity channel is used for bleeding, and the other cavity channel is used for bleeding), a joint 2 and a butterfly clip 3 which are connected to the top end of the dual-cavity catheter main body 1, two external branch pipes 4 are connected with the dual-cavity catheter main body 1 through the joint 2, and in addition, the existing dual-cavity catheter further comprises a heparin cap 5 connected to the external branch pipes 4, a catheter clip 6 used for clamping the external branch pipes 4 and other components.

The central veins more commonly used for hemodialysis are: when the double-lumen catheter is used for dialysis, the double-lumen catheter body 1 is left in the central vein, and the joint 2 and above parts (including the two external branch pipes 4) are all placed outside the body and fixed on the skin surface by medical adhesive tape (see fig. 2, in which the broken line part of the catheter is inserted into the vein through the subcutaneous tunnel and the solid line part is exposed outside the body). The exposed part of the double-lumen catheter brings great inconvenience to the patient in putting on and taking off clothes and other daily activities, the external branch pipe 4 is touched by frequent carelessness, and the large-force collision/pulling can cause the double-lumen catheter main body 1 to shift or even slip out of the central vein. In addition, the external part of the catheter also affects the beauty and brings a heavy psychological burden to the patient. More seriously, because other parts of the dialysis catheter except the double-cavity catheter main body 1 are all arranged outside the body, the infection of the catheter outlet part and the subcutaneous tunnel infection, even the catheter infection, and the serious infection need to be subjected to tube drawing treatment.

Disclosure of Invention

The application aims to solve the technical problem of providing a puncturable hemodialysis catheter which has a simple integral structure and is placed outside the body without a branch pipe after intubation.

In order to solve the technical problems, the application adopts the following technical scheme: the utility model provides a can puncture hemodialysis pipe, is including being used for keeping somewhere the pipe main part in the vein and being used for keeping somewhere the repeatedly puncture pipe of subcutaneous, but repeatedly puncture pipe's front end is connected in the pipe main part and communicates with each other with the inside cavity of pipe main part, repeatedly puncture pipe's end is sealed, but repeatedly puncture pipe is last still to be equipped with and be used for carrying out spacing fixed pipe fixed knot to it subcutaneously.

In one embodiment of the application, the puncturable hemodialysis catheter comprises two puncturable tubes and a catheter body, wherein two channels are arranged in the catheter body, and the two puncturable tubes are respectively communicated with one channel in the catheter body.

In another embodiment of the present application, the puncturable hemodialysis catheter includes two repeatedly puncturable tubes and two catheter bodies, each of which is provided with a lumen inside, each of the repeatedly puncturable tubes being correspondingly connected to one of the catheter bodies.

In the above embodiment, the repeatedly penetrating tube includes an outer layer and an inner layer made of expanded polytetrafluoroethylene or polyurethane, and an intermediate layer is disposed between the outer layer and the inner layer, where the intermediate layer is an elastic silica gel layer capable of retracting and stopping bleeding immediately after needle drawing or a polymer elastic material layer capable of self-healing after needle drawing.

Preferably, the catheter securement structure includes a connector for fixedly connecting the ends of the two reiteratable puncture tubes together.

Further, the connecting piece comprises a male buckle fixedly connected to the tail end of one repeatedly-penetrable pipe and a female buckle fixedly connected to the tail end of the other repeatedly-penetrable pipe, and the male buckle is inserted into the female buckle so as to connect the two repeatedly-penetrable pipes together.

Still further, but the end of puncture pipe repeatedly seals up through locating the spacer in its inner chamber, but the pipe wall of puncture pipe repeatedly extends upwards and exceeds the spacer and forms the hasp installation cavity that is used for installing pin thread and box, pin thread and box are installed respectively in the hasp installation cavity of a puncture pipe repeatedly, pin thread includes a bellied strip insert head outwards, the box include one with the slot that the strip insert head matches, be equipped with the slice flank on the outer peripheral face of strip insert head, but the outer edge parallel and level of slice flank is located puncture pipe repeatedly outer peripheral face or is located puncture pipe repeatedly outer peripheral face's inboard, after the strip insert head inserts the slot, the slice flank exposes outside the box, the through wires hole has been seted up on the slice flank, with slice flank and skin suture together can be right but the end of puncture pipe repeatedly carries out spacing fixedly.

Preferably, the catheter fixing structure comprises a sheet-shaped side wing fixedly connected to the front end and/or the tail end of the repeatedly-penetrable tube, a threading hole is formed in the sheet-shaped side wing, and the repeatedly-penetrable tube can be limited and fixed after the sheet-shaped side wing and the skin are sutured together.

Preferably, the catheter fixing structure comprises a terylene collar fixedly sleeved at the front end and/or the tail end of the repeatedly-penetrable tube.

As a preferred embodiment, the outer circumferential surface of the repeatable puncture pipe is provided with annular and/or spiral grooves.

Compared with the existing dialysis catheter (such as a double-cavity catheter in the background art), the puncturable hemodialysis catheter provided by the application omits the butterfly clip, the heparin cap, the catheter clip and other parts, and has a simpler overall structure. More importantly, when the application is used for central venous catheterization, the puncture tube can be repeatedly buried in a subcutaneous tunnel for fixation after the operation, and the skin surface cannula opening can be sutured by threads, so that the infection rate is greatly reduced. In addition, because the catheter is hidden under the skin, the probability of displacement of the catheter caused by collision/pulling of the clothing and the clothing worn by a patient frequently is reduced, the convenience of daily activities of the patient is greatly improved, the catheter can be repeatedly penetrated into the tube through the skin by penetrating the needle at the beginning of hemodialysis, the hemostasis can be achieved by pulling out the needle and pressing after the completion of the dialysis and heparin water seal of the tube, the later dialysis cost is lower than that of the conventional catheter and the nursing is simpler (the heparin cap and the dressing bag at the skin outlet of the catheter are required to be replaced after each dialysis of the conventional dialysis catheter, and the skin outlet part, the catheter joint and the outlet of the catheter are also required to be disinfected each time). Finally, because the repeatedly-penetrable tube is hidden under the skin, the whole dialysis catheter has no external part, has good aesthetic property and is also beneficial to reducing psychological burden of patients.

Drawings

FIG. 1 is a schematic view of the overall structure of a prior art dual lumen catheter;

FIG. 2 is a schematic illustration of a prior art single placement of a dual lumen catheter in the jugular vein and subclavian vein;

FIG. 3 is a schematic view showing the overall structure of a puncturable hemodialysis catheter of example 1;

FIG. 4 is a schematic view showing the overall structure of the puncturable hemodialysis catheter of example 2;

FIG. 5 is a schematic illustration of a single placement of a jugular vein or subclavian vein using the pierceable hemodialysis catheter of FIG. 3;

FIG. 6 is a schematic illustration of simultaneous placement of an internal jugular vein and a subclavian vein using the pierceable hemodialysis catheter of FIG. 4;

FIG. 7 is a schematic illustration of simultaneous jugular vein catheterization using the pierceable hemodialysis catheter of FIG. 4;

FIG. 8 is a schematic illustration of simultaneous catheterization of both femoral veins using the pierceable hemodialysis catheter shown in FIG. 4;

FIG. 9 is a schematic cross-sectional view of a repeatable run length of tubing according to the present application;

FIG. 10 is a schematic view of the overall structure of the two repeatedly operable tubes of the operable hemodialysis catheter of FIG. 3, as they are about to be connected by a pin and a box;

FIG. 11 is a schematic view of the overall structure of the two repeatedly operable tubes of the operable hemodialysis catheter of FIG. 3 after the ends are connected by a pin and a box;

FIG. 12 is an enlarged view of a portion of the portion A of FIG. 10;

FIG. 13 is an enlarged view of a portion of the portion B of FIG. 10;

FIG. 14 is an enlarged view of a portion of the portion A of FIG. 11;

in the figure:

1-double-cavity catheter main body 2-joint 3-butterfly clip

4-external catheter 5-heparin cap 6-catheter clip

10-catheter body 11-repeatedly puncturable tube 11 a-outer layer

11 b-inner layer 11 c-middle layer 11 d-spacer

12 a-connecting piece 12 b-sheet-shaped flank 12 c-terylene collar

12a 1-pin 12a 2-box 12a1 a-strip-shaped insertion head

12a2 a-slots.

Detailed Description

In the description of the present application, it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "top", "bottom", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.

As shown in fig. 3, 4 and 10-14, a puncturable hemodialysis catheter comprises a catheter main body 10 for being placed in a vein and a puncturable tube 11 for being placed under the skin, wherein the front end of the puncturable tube 11 is connected with the catheter main body 10 and is communicated with a cavity in the catheter main body 10, the tail end of the puncturable tube 11 is closed, and a catheter fixing structure for limiting and fixing the puncturable tube 11 under the skin is further arranged on the puncturable tube 11.

In addition to the structures of examples 1 and 2 below, the puncturable hemodialysis catheter of the present application includes, but is not limited to, the following structures (the structures described below are not shown in the drawings): for example, 3 channels are arranged in the catheter main body 10, 3 repeatedly-penetrable tubes 11 are connected to the top end of the catheter main body 10, each repeatedly-penetrable tube 11 is correspondingly communicated with one channel, one channel is used as a blood inlet cavity, one channel is used as a bleeding cavity, and the third channel can be used as a long-term parenteral nutrition, a long-term antibiotic injection and a long-term analgesic injection administration way. Of course, the catheter body 10 including 3 lumens is relatively large in diameter, and is not usable for subclavian vein catheterization in practice, but is usable for internal jugular veins having relatively large internal diameters. In addition, the aforementioned puncturable hemodialysis catheter may further adopt the following structure: for example, the catheter comprises two catheter main bodies 10, wherein 2 channels are arranged in one catheter main body 10, one channel is a blood inlet cavity, the other channel is used as a long-term parenteral nutrition, long-term antibiotic injection and long-term analgesic injection administration way, two repeatedly-penetrable pipes 11 are correspondingly connected to the top end of the catheter main body 10 comprising the 2 channels, and each repeatedly-penetrable pipe 11 is correspondingly communicated with 1 channel; the other catheter main body 10 is internally provided with 1 cavity which is used as a bleeding cavity, the top end of the catheter main body 10 containing 1 cavity is correspondingly connected with a repeatedly puncturable tube 11 communicated with the internal cavity, the catheter main body 10 with 2 cavities is used for inserting the internal jugular vein, and the catheter main body 10 with 1 cavity is inserted into the subclavian vein or the internal jugular vein at the other side.

As can be seen from the above description, compared with the existing dialysis catheter (such as the dual-lumen catheter in the background art), the puncturable hemodialysis catheter provided by the application omits the butterfly clip 3, the heparin cap 5, the catheter clip 6 and other components, and has a simpler overall structure. More importantly, when the application is adopted for central venous catheterization, the puncture tube 11 can be repeatedly buried in a subcutaneous tunnel for fixation after the operation, and the skin surface cannula opening can be sutured by threads, so that the infection rate is greatly reduced. In addition, because the catheter is hidden under the skin, the probability of displacement of the catheter caused by collision/pulling of the clothing and the clothing worn by a patient frequently is reduced, the convenience of daily activities of the patient is greatly improved, the patient can repeatedly puncture the tube 11 through the skin penetration of the needle head at the beginning of hemodialysis, the hemodialysis is completed, the heparin water is used for sealing the tube, then the needle is pulled out to press for hemostasis, the later dialysis cost is lower than that of the conventional catheter, and the nursing is simpler (the heparin cap 5 and the dressing bag at the skin outlet of the catheter are required to be replaced after each dialysis of the conventional dialysis catheter, and the skin outlet part, the catheter joint and the outlet of the catheter are also required to be disinfected each time). Finally, because the repeatedly-penetrable tube 11 is hidden under the skin, the whole dialysis catheter has no external part, has good aesthetic property, and is also beneficial to reducing psychological burden of patients.

The application is further described below in connection with two embodiments and the accompanying drawings for the purpose of facilitating understanding to those skilled in the art.

Example 1:

as shown in fig. 3, a puncturable hemodialysis catheter comprises two repeatedly puncturable tubes 11 which are used for being placed under the skin and a catheter main body 10 which is used for being placed in the vein, wherein two cavity channels are arranged in the catheter main body 10, the two repeatedly puncturable tubes 11 are respectively communicated with one cavity channel in the catheter main body 10, the tail ends of the repeatedly puncturable tubes 11 are closed, and a catheter fixing structure which is used for limiting and fixing the repeatedly puncturable tubes 11 under the skin is further arranged on the repeatedly puncturable tubes 11.

The aforementioned puncturable hemodialysis catheter may be selected from the tube-placing method shown in fig. 5 (the dashed line in the drawing is a puncturable tube 11 buried in a subcutaneous tunnel and a catheter body 10 inserted into a vein), the catheter body 10 is inserted into an internal jugular vein or subclavian vein, the two puncturable tubes 11 are inserted into the punctured subcutaneous tunnel and fixed, it should be noted that each turning portion of the puncturable tube 11 after the fixation must be ensured to be gentle, no sharp/bending occurs, and finally the skin surface cannula port is sutured (other conventional processing steps such as cleaning, disinfection and the like are omitted for simplifying the description, and not specifically described).

Example 2:

see fig. 4, a puncturable hemodialysis catheter, including two be used for keeping somewhere the subcutaneous can puncture pipe 11 repeatedly and two be used for keeping somewhere the catheter body 10 in the vein, catheter body 10 is inside all to be equipped with a chamber way, and every can puncture pipe 11 repeatedly all corresponds to be connected with a catheter body 10, and the end of can puncture pipe 11 repeatedly is sealed, still is equipped with on the can puncture pipe 11 repeatedly and is used for carrying out spacing fixed catheter fixing structure to it under the skin.

The above-mentioned puncturable hemodialysis catheter may be selected from the tube-placing method shown in fig. 6 (the broken line in the drawing is a puncturable tube 11 buried in a subcutaneous tunnel and a catheter body 10 inserted into a vein), one catheter body 10 is inserted into an internal jugular vein, the other catheter body 10 is inserted into a subclavian vein, the puncturable tubes 11 connected to the two catheter bodies 10 are respectively inserted into the punctured subcutaneous tunnel and fixed, and as in embodiment 1, each turning portion of the puncturable tube 11 after fixing should be smooth, no sharp bending/bending occurs, and finally the skin-side cannula opening is sutured by a thread (other conventional processing steps such as cleaning and disinfection have been omitted for simplifying the description, and not specifically described).

In addition, the above-mentioned puncturable hemodialysis catheter may be a tube-placing method (the broken line in the figure is a puncturable tube 11 buried in a subcutaneous tunnel and a catheter body 10 inserted into a vein) as shown in fig. 7, the two catheter bodies 10 are respectively inserted into internal jugular veins on both sides, the puncturable tube 11 connected to the two catheter bodies 10 is respectively inserted into a punctured subcutaneous tunnel (the subcutaneous tunnel spans the neck) and is fixed, and as in the tube-placing method, each turning part of the puncturable tube 11 after fixing should be ensured to be gentle, no sharp bending/bending occurs, and finally the skin-surface cannula opening is sewn with a line (other conventional processing steps such as cleaning, disinfection and the like have been omitted for simplifying the description, and not described in detail).

In addition, the above-mentioned puncturable hemodialysis catheter may be also selected from the tube-placing method shown in fig. 8 (the dashed line in the figure is a puncturable tube 11 buried in a subcutaneous tunnel and a catheter body 10 inserted into a vein), the two catheter bodies 10 are respectively inserted into the femoral vein at both sides, the puncturable tube 11 connected to the two catheter bodies 10 is respectively inserted into the punctured subcutaneous tunnel (the subcutaneous tunnel spans the abdomen) and is fixed, as in any tube-placing method, each turning part of the puncturable tube 11 after being fixed should be ensured to be gentle, no sharp bending/bending situation can occur, and finally the percutaneous cannula opening is sutured (for simplifying the description, other conventional processing steps such as cleaning and disinfection have been omitted, etc.), which are not described in detail).

In the above embodiments 1 and 2, in order to avoid sliding displacement of the repeatedly pierceable tube 11 down the subcutaneous tunnel with a smooth surface (the smooth surface is more advantageous for penetrating the subcutaneous tunnel), the above catheter fixing structure includes a connector 12a for fixedly connecting the distal ends of the two repeatedly pierceable tubes 11 together. The skin and the muscle around the subcutaneous tunnel are tightly connected and not separated, and after the tail ends of the two repeatedly puncturable tubes 11 are fixedly connected together, the positions of the repeatedly puncturable tubes 11 can be better limited due to the blocking effect of the skin and the muscle around the subcutaneous tunnel, so that the condition that the two repeatedly puncturable tubes 11 slide downwards to cause the catheter main body 10 to be inserted into the vein too deeply is avoided.

Preferably, as shown in fig. 10-12 and 14 (the structure of the connector 12a is described herein using fig. 10-12 and 14. Although the pierceable hemodialysis catheter of fig. 10-12 and 14 uses the structure of example 1, it should be noted to those skilled in the art that the connector 12a of the structure shown in the above-mentioned figures is not limited to use with the pierceable hemodialysis catheter of example 1, and can be used in other embodiments of the present application), the connector 12a includes a male buckle 12a1 fixedly connected to the end of one of the pierceable tubes 11 and a female buckle 12a2 fixedly connected to the end of the other of the pierceable tubes 11, and the male buckle 12a1 is inserted into the female buckle 12a2 to connect the two pierceable tubes 11 together. When the connecting member 12a adopts a snap structure, it is necessary to make a slit on the surface of the subcutaneous tunnel where the distal end of the repeatedly pierceable tube 11 is located, so that the male buckle 12a1 can be inserted into the female buckle 12a2 by a manual operation, and the slit is sewn with a thread after the snap connection. It should be emphasized that, although the present application is not described in detail on how the pin 12a1 and the box 12a2 are engaged and connected and how the connection structures of the two are matched, it should be understood by those skilled in the art that the specific structures of the pin 12a1 and the box 12a2 may be selected according to the needs in the prior art, and there are various fastening structures in the prior art that can achieve the objects of the present application, and these fastening structures that can achieve the objects of the present application may be applied to the present application in theory.

Specifically, as shown in fig. 12, the end of the repeatable puncture tube 11 is plugged by a spacer 11d disposed in the inner cavity thereof, the tube wall of the repeatable puncture tube 11 extends upward to be higher than the spacer 11d to form a latch mounting cavity for mounting the male buckle 12a1 and the female buckle 12a2, the male buckle 12a1 and the female buckle 12a2 are correspondingly mounted in the latch mounting cavity of the repeatable puncture tube 11, the male buckle 12a1 comprises a strip-shaped insertion head 12a1a protruding outwards, the female buckle 12a2 comprises a slot 12a2a matched with the strip-shaped insertion head 12a1a, a sheet-shaped flank 12b is disposed on the outer peripheral surface of the strip-shaped insertion head 12a1a, the outer edge of the sheet-shaped flank 12b is flush with the outer peripheral surface of the repeatable puncture tube 11 or is located on the inner side of the outer peripheral surface of the repeatable puncture tube 11, as shown in fig. 14, the sheet-shaped flank 12b is exposed out of the female buckle 12a2 after the strip-shaped insertion head 12a1a is inserted into the slot 12a, and the sheet-shaped flank 12b is provided with a threading hole, and the sheet-shaped flank 12b and the end of the repeatable puncture tube 11 can be limited. The following benefits are provided by providing the sheet-like side wings 12b on the outer peripheral surface of the strip-shaped insertion head 12a1a and defining the outer edges flush with the outer peripheral surface of the reissuable tube 11 or inside the outer peripheral surface of the reissuable tube 11: 1. compared with the situation that the sheet-shaped side wings 12b are directly arranged on the outer peripheral surface of the repeatable puncture tube 11, the sheet-shaped side wings 12b are arranged on the outer peripheral surface of the strip-shaped insertion head 12a1a and limit the outer edge to be flush with the outer peripheral surface of the repeatable puncture tube 11 or located on the inner side of the outer peripheral surface of the repeatable puncture tube 11, so that the condition that a pipeline penetrates into a subcutaneous tunnel is more facilitated, and the condition that the sheet-shaped side wings 12b scratch/pull the wall of the subcutaneous tunnel is avoided in the tube penetrating process, so that the damage of the subcutaneous tunnel is facilitated to be reduced, and the subcutaneous bleeding is reduced. 2. After the strip-shaped insertion head 12a1a is inserted into the insertion slot 12a2a, the sheet-shaped side wings 12b are exposed outside the female buckle 12a2, so that a gap exists between the tail ends of the two repeatedly puncturable tubes 11, and the muscle gradually grows into the gap after operation, which is also beneficial to fixing the tail ends of the repeatedly puncturable tubes 11.

In all the embodiments of the present application, the repeatable puncture needle 11 preferably has the structure shown in fig. 9: the hemostatic elastic material comprises an outer layer 11a and an inner layer 11b which are made of expanded polytetrafluoroethylene or polyurethane, wherein an intermediate layer 11c is arranged between the outer layer 11a and the inner layer 11b, and the intermediate layer 11c is an elastic silica gel layer which can retract to stop bleeding immediately after needle drawing or a high-molecular elastic material layer which can be self-healed after needle drawing.

In addition, as shown in fig. 12 to 14 (the catheter fixing structure is described with reference to fig. 12 to 14, although fig. 12 to 14 are partial enlarged views of fig. 10 and 11, and the puncturable hemodialysis catheter of fig. 10 and 11 is constructed as shown in example 1, it should be noted by those skilled in the art that the catheter fixing structure of the structure shown in fig. 12 to 14 is not limited to the puncturable hemodialysis catheter of example 1, and can be used in other embodiments of the present application), and in all the embodiments of the present application, the catheter fixing structure includes a flap-shaped side flap 12b fixedly connected to the front end and/or the distal end of the puncturable tube 11 (for the case of connecting the distal ends of two puncturable tubes 11 together with a snap structure, as described above and shown in fig. 12 and 14, the flap-shaped side flap 12b of the distal end of the puncturable tube 11 need only be provided on the strip-shaped insertion head 12a1a of the male buckle 12a1, and need not be provided on the outer circumferential surface of the distal end of the puncturable tube 11), and the flap-shaped side flap 12b is provided with a threading hole, and the flap-shaped side flap 12b can be sewn together with the puncturable tube 11.

Also preferably, as shown in fig. 12 and 14, in all embodiments of the present application, the catheter securement structure includes a dacron collar 12c (also referred to in the industry as a "cuff") fixedly positioned over the front and/or distal ends of the reiteratable puncture tube 11. The terylene collar 12c can help to fix the repeatable puncture tube 11 and reduce the probability of sliding and displacement of the catheter, and particularly, as the terylene collar 12c is woven by terylene, small gaps exist among fibers, and after the terylene collar is left under the skin for a period of time, the terylene collar is gradually adhered to the muscle along with the growth of the muscle, so that the terylene collar can well help to fix the repeatable puncture tube 11.

Finally, in the present application, the outer circumferential surface of the repeatable runout tube 11 is provided with annular and/or spiral grooves (the annular and/or spiral grooves are not shown in the drawings). The purpose of forming the annular and/or spiral grooves on the outer peripheral surface of the repeatedly puncturable tube 11 also plays a role in helping the repeatedly puncturable tube 11 to limit and fix, and the repeatedly puncturable tube 11 can be better prevented from sliding/rotating after the postoperative muscle growth is filled in the grooves.

The foregoing embodiments are preferred embodiments of the present application, and in addition, the present application may be implemented in other ways, and any obvious substitution is within the scope of the present application without departing from the concept of the present application.

In order to facilitate understanding of the improvements of the present application over the prior art, some of the figures and descriptions of the present application have been simplified and some other elements have been omitted for clarity, as will be appreciated by those of ordinary skill in the art.

Claims

1. A puncturable hemodialysis catheter, characterized by: the utility model provides a can puncture hemodialysis pipe includes two be used for keeping somewhere under skin and the sealed pipe (11) of can puncture repeatedly and two be used for keeping somewhere in different veins pipe main part (10) that end is sealed, pipe main part (10) are inside all to be equipped with a chamber way, and every can puncture repeatedly pipe (11) all correspond to be connected in a pipe main part (10) and communicate with each other with the chamber way of this pipe main part (10) inside, but be equipped with on puncture repeatedly pipe (11) still and be used for carrying out spacing fixed pipe fixed knot to it under skin, pipe fixed knot constructs including being used for connecting together the connecting piece (12 a) of the end of two can puncture repeatedly pipe (11) fixed in subcutaneous tunnel.

2. The puncturable hemodialysis catheter according to claim 1, wherein: the repeatedly-penetrable tube (11) comprises an outer layer (11 a) and an inner layer (11 b) which are made of expanded polytetrafluoroethylene or polyurethane, an intermediate layer (11 c) is arranged between the outer layer (11 a) and the inner layer (11 b), and the intermediate layer (11 c) is an elastic silica gel layer which can retract to stop bleeding immediately after needle drawing or a polymer elastic material layer which can be self-healed after needle drawing.

3. The puncturable hemodialysis catheter according to claim 1 or 2, wherein: the connecting piece (12 a) comprises a male buckle (12 a 1) fixedly connected to the tail end of one repeatedly-penetrable pipe (11) and a female buckle (12 a 2) fixedly connected to the tail end of the other repeatedly-penetrable pipe (11), and the male buckle (12 a 1) is inserted into the female buckle (12 a 2) so as to connect the two repeatedly-penetrable pipes (11) together.

4. A puncturable hemodialysis catheter according to claim 3, wherein: the tail end of the repeatable puncture tube (11) is plugged through a spacer (11 d) arranged in the inner cavity of the repeatable puncture tube, the tube wall of the repeatable puncture tube (11) extends upwards to be higher than the spacer (11 d) to form a lock catch mounting cavity for mounting a male buckle (12 a 1) and a female buckle (12 a 2), the male buckle (12 a 1) and the female buckle (12 a 2) are respectively correspondingly mounted in the lock catch mounting cavity of the repeatable puncture tube (11), the male buckle (12 a 1) comprises a strip-shaped insertion head (12 a1 a) protruding outwards, the female buckle (12 a 2) comprises a slot (12 a2 a) matched with the strip-shaped insertion head (12 a1 a), a sheet-shaped side wing (12 b) is arranged on the outer peripheral surface of the strip-shaped insertion head (12 a1 a), the outer edge of the sheet-shaped side wing (12 b) is flush with the outer peripheral surface of the repeatable puncture tube (11) or is positioned on the inner side of the outer peripheral surface of the repeatable puncture tube (11), the strip-shaped side wing (12 a) is inserted into the strip-shaped insertion head (12 a 2), and the sheet-shaped side wing (12 a) can be sewn on the outer side of the strip-shaped side wing (12 a) after the strip-shaped insertion head (12 a) is inserted into the strip-shaped insertion head (12 a), and the sheet-shaped side wing (12 a) is repeatedly threaded together, and the sheet-shaped side wing (12 b) is sewn.

5. The puncturable hemodialysis catheter according to claim 1 or 2, wherein: the catheter fixing structure also comprises a terylene collar (12 c) fixedly sleeved at the front end and/or the tail end of the repeatable puncture tube (11).

6. The puncturable hemodialysis catheter according to claim 1 or 2, wherein: the outer peripheral surface of the repeatable penetrating pipe (11) is provided with annular and/or spiral grooves.