CN220967794U - Internal fistula indwelling needle for hemodialysis - Google Patents

Abstract

The utility model discloses an internal fistula indwelling needle for hemodialysis, wherein the tail end of a trocar is detachably connected with a first heparin cap; the first flow stopping clamp is connected to the trocar and can control the on-off of the trocar; the guide needle is connected in the trocar in a plug-in mode, the tip end of the guide needle can extend out of the trocar through the head end opening of the trocar, and the tail end of the guide needle is left outside the trocar; one port of the extension hose is integrally connected with the side wall of the trocar and communicated with the inner cavity of the trocar, meanwhile, the other port of the extension hose is detachably connected with a second heparin cap, and the first flow stopping clamp is positioned between the communicated part of the extension hose and the trocar and the second heparin cap; the second flow stopping clamp is connected to the extension hose and can control the on-off of the extension hose. The utility model can provide a larger operation space for medical staff and reduce the workload of the medical staff.

Description

Internal fistula indwelling needle for hemodialysis

Technical Field

The utility model relates to the technical field of medical instruments, in particular to an internal fistula indwelling needle for hemodialysis.

Background

Hemodialysis is one of the kidney replacement treatment modes of patients with acute and chronic renal failure. The method comprises the steps of draining in-vivo blood to the outside of the body, passing through a dialyzer consisting of innumerable hollow fibers, wherein the blood and electrolyte solution (dialysate) with similar concentration of the body are in and out of the hollow fibers, and carrying out substance exchange by dispersion/convection to remove metabolic wastes in the body and maintain the balance of the electrolyte and acid and alkali; at the same time, the whole process of removing excessive water from the body and reinfusion of the purified blood is called hemodialysis.

In order to reduce the number of punctures to a patient's blood vessel, an internal fistula indwelling needle is currently inserted into the patient's blood vessel, and the current internal fistula indwelling needle (the internal fistula indwelling needle for drawing blood from the patient's blood vessel and the internal fistula indwelling needle for returning purified blood into the patient's blood vessel have the same structure) includes: the guide needle, the trocar (in order to prevent the sleeve from colliding with the wall of a blood vessel, the trocar adopts a soft tube) and the flow stopping clamp, the head end of the trocar is a pointed end with a needle hole, the port of the tail end is connected with a heparin cap, the pointed end of the guide needle can penetrate into the trocar through the heparin cap and extend out of the trocar from the port of the head end of the trocar, the tail end of the guide needle is left outside the trocar, the guide needle can drive the trocar to puncture the blood vessel, then the guide needle is pulled back to be separated from the blood vessel and the trocar, the flow stopping clamp clamps the trocar to avoid blood backflow in the blood vessel of a patient, then, the heparin cap on the internal fistula indwelling needle of the blood introducing end (the internal fistula indwelling needle for drawing blood from the blood vessel of the patient) and the heparin cap on the internal fistula indwelling needle of the blood returning end (the internal fistula indwelling needle for returning purified blood into the blood vessel of the patient) are removed respectively, and the tail port of the trocar on the internal fistula indwelling needle of the blood introducing end is communicated with one end of a pipeline on the hemodialysis machine, and the other end of the pipeline on the hemodialysis machine is communicated with the tail port of the trocar on the internal fistula indwelling needle of the blood returning end, and the pump flow speed of the dialysis machine is adjusted, and the flow stopping clamp is opened, so that the trocar is in a conducting state, and hemodialysis can be performed.

However, since the internal fistula indwelling needle in the prior art only has one port at the tail end of the trocar and needs to be communicated with a pipeline of a hemodialysis machine, and in the hemodialysis process, liquid medicine needs to be frequently fed into a blood vessel of a patient, in order to reduce puncture of the patient, a three-way connector (see CN211068314U an internal fistula indwelling needle in particular) needs to be firstly communicated with the tail port of the trocar before the tail port of the trocar is communicated with the pipeline of the hemodialysis machine, one pipe orifice of the three-way connector can be communicated with the pipeline of the hemodialysis machine, and the liquid medicine can be injected through the pipe orifice at the other end of the three-way connector, so that the liquid medicine can flow back into the blood vessel of a person along with external circulation, but the operation is troublesome when the three-way connector is communicated with the tail port of the trocar, and a plurality of patients are in hospitals each day, so that clinical workload is high; and, the length of present internal fistula keep somewhere needle and three way connection is all shorter, therefore even there is three way connection at the afterbody port switch-on of trocar, after the internal fistula keep somewhere the needle puncture in patient's blood vessel, three way connection and patient's distance can also be nearer, consequently medical personnel's operating space is less, leads to medical personnel's operation inconvenient (if inconvenient medical personnel put through three way connection with hemodialysis machine's pipeline), especially the condition that hemodialysis machine's pipeline length is insufficient, then more unfavorable with three way connection with hemodialysis machine's pipeline switch-on.

In addition, the internal fistula indwelling needle in the prior art has no special sampling point, and in order to reduce the influence of the collected blood sample by the replenishing liquid medicine, medical staff is required to puncture and sample the blood vessel of a patient through a syringe at present, so that the pain of the patient can be increased.

Therefore, how to provide an internal fistula indwelling needle for hemodialysis, which can provide a larger operation space for medical staff and reduce the workload of the medical staff, is a technical problem to be solved by the technical staff in the art.

Disclosure of utility model

In view of the above, the present utility model provides an internal fistula indwelling needle for hemodialysis, which aims to solve at least some of the above technical problems.

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

An internal fistula indwelling needle for hemodialysis, comprising:

The trocar is tubular, the two ends of the trocar are both open ends, the head end of the trocar is a tip, and the tail end of the trocar is detachably connected with a first heparin cap;

a first flow stopping clamp connected to the trocar and capable of controlling the on-off of the trocar;

A guide needle, the guide needle being connected in a plug-in manner within the trocar, and a tip of the guide needle being extendable out of the trocar through a head end opening of the trocar, while a tail end of the guide needle remains out of the trocar;

An extension hose, one port of the extension hose is integrally connected with the side wall of the trocar and communicated with the inner cavity of the trocar, meanwhile, the other port of the extension hose is detachably connected with a second heparin cap, and the first flow stopping clamp is positioned between the communicated position of the extension hose and the trocar and the second heparin cap;

and the second flow stopping clamp is connected to the extension hose and can control the on-off of the extension hose.

Preferably, the method further comprises: sampling point location structure, and sampling point location structure includes:

the sleeve is concentrically sleeved on the extension hose and fixedly connected with the extension hose;

the sampling tube is vertically distributed with the sleeve, and one end of the sampling tube is connected to the side wall of the sleeve and communicated with the sleeve; meanwhile, a sampling port is formed in the side wall of the extension hose, corresponding to the connection position of the sampling tube and the sleeve, and the sampling port is connected with the sampling tube through the connection position of the sampling tube and the sleeve;

The rubber stopper is embedded in the sampling tube, and the side wall of the rubber stopper is fixedly connected with the inner wall of the sampling tube.

Preferably, the cannula is proximal to the second heparin cap.

Preferably, the rubber plug is located at one end of the sampling tube far away from the sleeve, and is arranged at a distance from the connection position of the sampling tube and the sleeve.

Preferably, the outer wall of the sampling tube is concentrically sleeved and fixed with an annular plate.

Preferably, a plurality of through holes communicated with the inner cavity of the trocar are formed in the side wall of the trocar.

Preferably, a plurality of said through holes are each adjacent to the tip of said trocar.

Preferably, the method further comprises: the protective sleeve is sleeved at the tip end of the trocar, and meanwhile, the opening end of the protective sleeve is clamped with the trocar body.

Compared with the prior art, the utility model discloses an internal fistula indwelling needle for hemodialysis, which can realize the following technical effects:

Compared with the prior art, the application has the advantages that the extension hose is connected to the trocar, the second heparin cap is detachably connected to the end, far away from the trocar, of the extension hose, meanwhile, the second flow stopping clamp is connected to the extension hose, the first flow stopping clamp is connected to the trocar, and the first flow stopping clamp is positioned between the connection part of the extension hose and the trocar and the second heparin cap, so that the application can meet the operation requirements, for example: when a pipeline on the hemodialysis machine is communicated with one end of the extension hose far away from the trocar and liquid (albumin, sodium bicarbonate and protamine) is required to be connected from a blood drawing end or a blood return end for infusion, a soft rubber plug on the first heparin cap can be punctured through a syringe or a perfusion tube so as to continuously push and inject liquid medicine into the trocar;

because the port of the extension hose is integrally connected with the side wall of the trocar, the three-way joint is not required to be connected to the trocar before the pipeline of the hemodialysis machine is connected, so that the operation links are reduced, and the clinical workload is lightened;

Meanwhile, the application is connected with the trocar by the extension hose, and the length of the extension hose is about 40cm, so that the operation space of medical staff is greatly improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view showing the overall structure of an internal fistula indwelling needle for hemodialysis according to the present utility model;

FIG. 2 is an enlarged view of the structure at A in FIG. 1;

FIG. 3 is a cross-sectional view of FIG. 1, and the first and second stop clips are not shown in FIG. 2;

FIG. 4 is an enlarged view of the structure at B in FIG. 3;

FIG. 5 is an enlarged view of the structure at C in FIG. 3;

FIG. 6 is an enlarged view of the structure at D in FIG. 3;

FIG. 7 is an enlarged view of the structure at E in FIG. 3;

Fig. 8 is a cross-sectional view of a first heparin cap and a second heparin cap of the present utility model.

Wherein, 1-trocar; 2-a first heparin cap; 3-a first stop clip; 4-guiding the needle; 5-extending the hose; 6-a second heparin cap; 7-a second stop clip; 8-a sampling point positioning structure; 81-sleeve; 82-sampling tube; 50-sampling port; 83-rubber stopper; 84-an annular plate; 10-through holes.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The embodiment of the utility model discloses an internal fistula indwelling needle for hemodialysis, which comprises:

The trocar 1 is tubular, the two ends of the trocar 1 are both open ends, the head end of the trocar 1 is a tip, and the tail end of the trocar 1 is detachably connected with a first heparin cap 2;

a first flow stopping clamp 3, wherein the first flow stopping clamp 3 is connected to the trocar 1 and can control the on-off of the trocar 1;

The guide needle 4 is connected in the trocar 1 in a plug-in way, the tip of the guide needle 4 can extend out of the trocar 1 through the head end opening of the trocar 1, and the tail end of the guide needle 4 is left outside the trocar 1;

The extension hose 5, one port of the extension hose 5 is integrally connected with the side wall of the trocar 1 and communicated with the inner cavity of the trocar 1, meanwhile, the other port of the extension hose 5 is detachably connected with the second heparin cap 6, and the first flow stopping clamp 3 is positioned between the communicated position of the extension hose 5 and the trocar 1 and the second heparin cap 6;

And the second flow stopping clamp 7 is connected to the extension hose 5, and can control the on-off of the extension hose 5.

Wherein, the first flow stopping clip 3 and the second flow stopping clip 7 can be "Robert clips" in the prior art, and are also called: the principle of how to control the conduction and blocking of the hose is well known to those skilled in the art, and will not be described in detail herein.

In addition, in order to prevent the trocar 1 from colliding with the wall of the blood vessel, the trocar 1 is a soft tube, the guide needle 4 is a steel needle in order to puncture, and the trocar 1 and the guide needle 4 are both in the prior art, and will not be described herein.

In addition, the first heparin cap 2 and the second heparin cap 6 are both "heparin caps" in the prior art, and how the heparin caps are connected to the tube opening is familiar to those skilled in the art, so that the description thereof will not be repeated here.

Meanwhile, the material of the extension hose 5 is the same as that of the infusion tube in the prior art.

During hemodialysis, two internal fistula indwelling needles for hemodialysis are needed to form a group, and one internal fistula indwelling needle for hemodialysis is used for drawing blood from a blood vessel of a patient and can be called a blood drawing end for short; another internal fistula indwelling needle for hemodialysis is used for reinfusion of purified blood into a patient's blood vessel, which may be abbreviated as the blood return end, which is common knowledge in the art;

When the application is applied, the internal fistula indwelling needle for hemodialysis, which is used for drawing blood from the blood vessel of a patient, has the same working principle as the internal fistula indwelling needle for hemodialysis, which is used for reinfusion of purified blood into the blood vessel of the patient, and is as follows:

S1, a first flow stopping clamp 3 is in an open state so as to enable a trocar 1 to be in a conducting state, a second flow stopping clamp 7 is in a closed state so as to enable an extension hose 5 to be in a blocking state, meanwhile, the tail end of the trocar 1 is connected with a first heparin cap 2, a second heparin cap 6 is connected to a port (one end of the extension hose 5, which is far away from the trocar 1) corresponding to the extension hose 5, at the moment, a medical staff firstly pierces the tip of the guide needle 4 into the inner cavity of the trocar 1, and continuously pushes the guide needle 4 until the tip of the guide needle 4 extends out of the trocar 1 through an opening at the head end of the trocar 1, and the tail end of the guide needle 4 is left outside the trocar 1;

S2, the medical staff aim the needle point of the guide needle 4 at the skin puncture position corresponding to the target blood vessel to start puncture, and the tip of the trocar 1 enters the target puncture position (internal fistula, namely, blood vessel) along with the guide needle 4 in the puncture process; after the puncture is in place and the position is fixed (the tail end of the trocar 1 and the tail end of the guide needle 4 are both positioned outside the body), the tail end of the guide needle 4 is held by hand and pulled backwards so as to pull the guide needle 4 out of the blood vessel, and the trocar 1 is kept in a state that the tip of the guide needle is inserted into the target blood vessel, so that a channel for connecting the target blood vessel with a pipeline of a hemodialysis machine is established through the trocar 1;

S3, closing the first flow stopping clamp 3 to enable the trocar 1 to be in a blocking state, and closing the second flow stopping clamp 7 to enable the extension hose 5 to be in a blocking state, so that blood backflow in a blood vessel of a patient is avoided;

S4, removing the second heparin cap 6 from the corresponding port of the extension hose 5 (the second heparin cap 6 is in threaded connection with the corresponding end of the extension hose 5), so that the corresponding port of the extension hose 5 (the end of the extension hose 5 away from the trocar 1) is connected with a pipeline on the hemodialysis machine (the corresponding port of the extension hose 5 of the internal fistula indwelling needle for hemodialysis for drawing blood from the blood vessel of the patient, and the corresponding port of the extension hose 5 of the internal fistula indwelling needle for hemodialysis for returning purified blood into the blood vessel of the patient are connected with the pipeline on the hemodialysis machine);

S5, opening the second flow stop clamp 7 to enable the extension hose 5 to be in a conducting state, opening the hemodialysis machine, and adjusting the flow rate of a pump in the hemodialysis machine so as to start the hemodialysis process.

S6, when the liquid medicine is needed to be supplemented in the hemodialysis process, the first flow stop clamp 3 is opened to enable the trocar 1 to be in a conducting state, then a needle head on a syringe containing the liquid medicine penetrates through a soft rubber plug (the first heparin cap 2 comprises a shell and the soft rubber plug, the inner wall of the shell of the first heparin cap 2 is provided with threads and is used for being in threaded connection with the trocar 1, the soft rubber plug of the first heparin cap 2 is fixed in the shell of the first heparin cap 2 and is used for sealing an opening at the tail of the trocar 1, the soft rubber plug is made of rubber materials generally) enters into a cavity of the trocar 1, so that the liquid medicine can be injected into the trocar 1 through the syringe, and the liquid medicine can enter into a blood vessel in a body through blood circulating in vitro.

Of course, in S4, the method may be replaced with: removing the first heparin cap 2 from the tail port of the trocar 1 (the first heparin cap 2 is in threaded connection with the tail end of the trocar 1), thereby connecting the tail port of the trocar 1 to a line on a hemodialysis machine (both the tail port on the trocar 1 of an internal fistula indwelling needle for hemodialysis for drawing blood from a patient's blood vessel and the tail port on the trocar 1 of an internal fistula indwelling needle for hemodialysis for returning purified blood to a patient's blood vessel are connected to a line on a hemodialysis machine);

Meanwhile, in S5, the substitution is: the first stop clamp 3 is opened to bring the trocar 1 into a conductive state, and the hemodialysis machine is opened and the flow rate of the pump in the hemodialysis machine is adjusted to start the hemodialysis process.

Meanwhile, in S6, the substitution is: in the hemodialysis process, when the liquid medicine is needed to be replenished, the second flow stop clamp 7 is opened to enable the extension hose 5 to be in a conducting state, then a needle on a syringe containing the liquid medicine penetrates through a soft rubber plug on the second heparin cap 6 (the second heparin cap 6 comprises a shell and a soft rubber plug, the inner wall of the shell of the second heparin cap 6 is provided with threads and is used for being in threaded connection with the extension hose 5, the soft rubber plug of the second heparin cap 6 is fixed in the shell of the second heparin cap 6 and is used for blocking a port of the extension hose 5, which is far away from the trocar 1, and the soft rubber plug is generally made of rubber material) to enter into a cavity of the extension hose 5, so that the liquid medicine can be injected into the extension hose 5 through the syringe, and the liquid medicine can enter into a blood vessel in a body through blood circulating in vitro.

In summary, compared with the prior art, the application has a plurality of liquid inlet ports (the tail opening of the trocar 1 and the port of the end of the extension hose 5 far away from the trocar 1) by connecting the extension hose 5 on the trocar 1 and detachably connecting the second heparin cap 6, simultaneously connecting the second flow stop clamp 7 on the extension hose 5 and the first flow stop clamp 3 on the trocar 1, and the first flow stop clamp 3 is positioned between the connection position of the extension hose 5 and the trocar 1 and the second heparin cap 6, so as to meet the operation requirement, for example: when the pipeline on the hemodialysis machine is communicated with one end of the extension hose 5, which is far away from the trocar 1, and liquid (albumin, sodium bicarbonate and protamine) is required to be connected from the blood drawing end or the blood return end for infusion, the soft rubber plug on the first heparin cap 2 can be penetrated through the injector or the infusion tube so as to continuously push the liquid medicine into the trocar 1;

In addition, as the port of the extension hose 5 is integrally connected with the side wall of the trocar 1, the three-way connector is not required to be connected to the trocar 1 before the pipeline of the hemodialysis machine is connected, so that the operation links are reduced, and the clinical workload is lightened;

Meanwhile, the application is connected with the extension hose on the trocar 1, the length of the extension hose is about 40cm, when the tip part of the front end of the trocar 1 is fixed on the skin of a patient, the extension hose 5 is limited in length, and if the extension hose is not used, the extension hose is easy to touch the skin or other parts of the patient during operation, but the length of the extension hose 5 is about 40cm, and when a medical staff operates, the free movable space of the long tail end of the extension hose 5 can be enlarged, so that the operation space is enlarged.

In order to further optimize the technical scheme, the method further comprises the following steps: sampling point location structure 8, and sampling point location structure 8 includes:

The sleeve 81 is concentrically sleeved on the extension hose 5 and fixedly connected with the extension hose 5;

The sampling tube 82, the sampling tube 82 is distributed vertically with the sleeve 81, and one end of the sampling tube 82 is connected to the side wall of the sleeve 81 and communicated with the sleeve 81; meanwhile, a sampling port 50 is formed in the side wall of the extension hose 5 corresponding to the connection position of the sampling tube 82 and the sleeve 81, and the sampling port 50 is connected with the sampling tube 82 through the connection position of the sampling tube 82 and the sleeve 81;

The rubber stopper 83, the rubber stopper 83 inlays and establishes in the sampling pipe 82, and the lateral wall of rubber stopper 83 and the inner wall rigid coupling of sampling pipe 82.

According to the technical scheme, the sampling tube 82 is connected to the extension hose 5 through the sleeve 81, and the sampling port 50 is communicated with the sampling tube 82 through the joint of the sampling tube 82 and the sleeve 81, so that when the blood of a patient needs to be sampled, the patient does not need to be additionally punctured, the needle head of the syringe is punctured with the rubber plug 83 and enters the extension hose 5 through the sampling tube 82, and the extracorporeal blood in the extension hose 5 can be extracted through the syringe, so that the pain of the patient can be relieved;

when the blood collection is completed, the needle of the syringe is pulled out, and the rubber plug 83 seals the sampling tube 82, so that the external blood in the extension hose 5 cannot flow out.

Moreover, the worker only needs to pierce the rubber plug 83 with the needle of the syringe, and the needle of the syringe enters the extension hose 5 through the sampling tube 82, so that the extracorporeal blood in the extension hose 5 can be extracted through the syringe, and the operation is convenient.

To further optimise the above solution, the sleeve 81 is close to the second heparin cap 6.

In order to further optimize the above technical solution, the rubber stopper 83 is located at an end of the sampling tube 82 away from the sleeve 81 and is spaced from the connection between the sampling tube 82 and the sleeve 81.

To further optimize the solution described above, an annular plate 84 is concentrically positioned and secured to the outer wall of the sampling tube 82.

By adopting the technical scheme, the fingers of the medical staff can be conveniently held on the annular plate 84 during sampling, so that the medical staff can conveniently and stably hold the sampling tube 82, and the sampling operation is convenient.

In order to further optimize the technical scheme, a plurality of through holes 10 which are communicated with the inner cavity of the trocar 1 are formed in the side wall of the trocar 1.

To further optimize the solution described above, a plurality of through holes 10 are all close to the tip of the trocar 1.

By adopting the technical scheme, when the tip opening of the trocar 1 is thrombosed or sticks to the wall of an internal fistula blood vessel, and the tip opening of the trocar 1 cannot draw back or push out blood, the plurality of through holes 10 on the side wall of the trocar 1 can prevent the problem that the trocar 1 loses function due to the non-passing of the tip opening of the trocar 1, namely: the opening at the tip of the trocar 1 is now replaced by a through hole 10 for conducting.

In addition, the structures not described in the present application are all prior art, and will not be described herein.

In order to further optimize the technical scheme, the method further comprises the following steps: the protection sleeve is sleeved at the tip end of the trocar 1, and meanwhile, the opening end of the protection sleeve is clamped with the body of the trocar 1.

The shape of the protective sleeve is a sleeve shape with one end being a closed end and the other end being an open end, so that when the trocar 1 is not needed to be used, the protective sleeve is sleeved at the tip of the trocar 1, the open end of the protective sleeve is clamped on the body of the trocar 1, the protective sleeve is prevented from falling off from the trocar 1, the tip of the trocar 1 is protected through the protective sleeve, and the problem that people are easy to be pricked through the tip of the trocar 1 when the protective sleeve is not used can be avoided.

The relation between the protective sleeve and the trocar 1 is the same as the principle that the protective sleeve on the syringe is sleeved on the syringe needle, and will not be described herein.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. An internal fistula indwelling needle for hemodialysis, comprising:

The trocar (1) is tubular, the two ends of the trocar (1) are open ends, the head end of the trocar (1) is a tip, and the tail end of the trocar (1) is detachably connected with a first heparin cap (2);

a first flow stopping clamp (3), wherein the first flow stopping clamp (3) is connected to the trocar (1) and can control the on-off of the trocar (1);

The guiding needle (4) is connected in the trocar (1) in a plug-in mode, the tip end of the guiding needle (4) can extend out of the trocar (1) through the head end opening of the trocar (1), and meanwhile the tail end of the guiding needle (4) is left outside the trocar (1);

An extension hose (5), wherein one port of the extension hose (5) is integrally connected with the side wall of the trocar (1) and communicated with the inner cavity of the trocar (1), meanwhile, the other port of the extension hose (5) is detachably connected with a second heparin cap (6), and the first flow stopping clamp (3) is positioned between the communicating position of the extension hose (5) and the trocar (1) and the second heparin cap (6);

And the second flow stopping clamp (7) is connected to the extension hose (5) and can control the on-off of the extension hose (5).

2. The internal fistula indwelling needle for hemodialysis of claim 1, further comprising: -a sampling point positioning structure (8), and the sampling point positioning structure (8) comprises:

The sleeve (81) is concentrically sleeved on the extension hose (5) and fixedly connected with the extension hose (5);

The sampling tube (82), the said sampling tube (82) is distributed with the said sleeve pipe (81) vertically, and one end of the said sampling tube (82) connects to the sidewall of the said sleeve pipe (81), and connect with the said sleeve pipe (81); meanwhile, a sampling port (50) is formed in the side wall of the extension hose (5) corresponding to the connection position of the sampling tube (82) and the sleeve (81), and the sampling port (50) is connected with the sampling tube (82) through the connection position of the sampling tube (82) and the sleeve (81);

The rubber plug (83), the rubber plug (83) is embedded in the sampling pipe (82), and the side wall of the rubber plug (83) is fixedly connected with the inner wall of the sampling pipe (82).

3. An internal fistula indwelling needle for hemodialysis according to claim 2, in which said sleeve (81) is adjacent to said second heparin cap (6).

4. The internal fistula indwelling needle for hemodialysis according to claim 2, wherein said rubber stopper (83) is located at an end of said sampling tube (82) remote from said sleeve (81) and is spaced apart from the junction of said sampling tube (82) and said sleeve (81).

5. The internal fistula indwelling needle for hemodialysis according to claim 2, wherein an annular plate (84) is concentrically sleeved and fixed on the outer wall of said sampling tube (82).

6. An internal fistula indwelling needle for hemodialysis according to any one of claims 1 to 5, in which a plurality of through holes (10) which are all communicated with the lumen of the trocar (1) are opened on the side wall of the trocar (1).

7. An internal fistula indwelling needle for hemodialysis according to claim 6, in which a plurality of said through holes (10) are each close to the tip of said trocar (1).

8. The internal fistula indwelling needle for hemodialysis of claim 1, further comprising: the protection sleeve is sleeved at the tip end of the trocar (1), and meanwhile, the opening end of the protection sleeve is clamped with the body of the trocar (1).