CN222130677U - A closable hemodiafiltration catheter - Google Patents

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to a closable hemodialysis filtration catheter which is mainly used for being placed into a patient temporarily or for a long time to perform hemodialysis/filtration on the patient, an arterial branch pipe used for leading arterial blood out and venous branch pipes used for sending the dialyzed and filtered blood back from the patient, wherein a first closing element is arranged in a first hole of the arterial branch pipe, a second closing element is arranged in a second hole of the venous branch pipe, the first closing element is configured to be capable of closing the first hole of the arterial branch pipe, the second closing element is configured to be capable of closing the second hole of the venous branch pipe, and the problems that thrombus is easy to form at a catheter opening due to the fact that an opening part of the conventional hemodialysis/filtration catheter is positioned in a blood vessel, and thrombus falls off and enters circulation risk are mainly solved.

Description

Closable hemodialysis filtration catheter

Technical Field

The utility model belongs to the technical field of medical appliances, and particularly relates to a closable hemodialysis filtration catheter.

Background

The temporary or long-term venous catheters used in clinical hemodialysis and hemofiltration (CRRT) are currently double-lumen catheters, which are divided into arterial ends and venous ends, and blood is led out/returned into the body during dialysis or hemofiltration, respectively. In the dialysis/hemofiltration interval, the catheter is required to be sealed by using anticoagulant drug solution, and at present, heparin sodium or sodium citrate is commonly used clinically for sealing, because the opening part of the catheter is positioned in a blood vessel, blood easily enters the catheter from the opening, and the following problems are easily caused by the contact between the inner wall of the catheter and the blood:

1. The catheter orifice is easy to form thrombus, which affects the service life of the catheter and even has the risk of thrombus falling off and entering circulation;

2. Anticoagulant drugs enter the circulation, affecting the patient's clotting function, and severe cases can cause bleeding events.

The present utility model addresses the above-described problems by providing a closable hemodiafiltration catheter.

Disclosure of utility model

In order to overcome the problems in the background art, the utility model adopts the following technical scheme:

a closable hemodialysis/filtration catheter, comprising:

An arterial branch tube for drawing arterial blood, the arterial branch tube having a first distal end and a first bore in communication with each other, wherein the first bore is for introducing arterial blood into the arterial branch tube;

A venous leg for venous return of dialyzed and filtered blood from the patient, the venous leg having a second distal end and a second aperture in communication with each other and a tip aperture, the venous leg and the arterial leg being adjacent to each other and the venous leg and the arterial leg not in communication, wherein the dialyzed and filtered blood is returned to the body through the second aperture and the tip aperture;

A first closure element disposed within the arterial branch, wherein the first closure element is configured to be capable of closing the first aperture of the arterial branch;

A second closure element disposed within the venous leg, wherein the second closure element is configured to be capable of closing the second aperture and the tip aperture of the venous leg.

In some embodiments of the application, the first aperture is formed in a free wall of the arterial branch and the second aperture is formed in a free wall of the venous branch.

In some embodiments of the application, there is a distance between the first aperture and the second aperture, wherein the first aperture and the second aperture are oppositely oriented.

In some embodiments of the application, the first aperture is configured as a port of the arterial branch tube into an intravascular end, wherein the first aperture and the first distal end correspond to each other;

The tip aperture is configured as a port of the venous leg into an intravascular end, wherein the tip aperture and the second distal end correspond to each other, the second aperture is located between the tip aperture and the second distal end, and the second aperture is proximate to the tip aperture.

In some embodiments of the application, the first closure element comprises:

A first balloon disposed on an inner wall of the arterial branch, wherein the first balloon has an expanded state in which the first aperture is closed and a contracted state;

A first connecting tube partially attached to an inner wall of the arterial branch tube, wherein the first connecting tube has a first end and a second end opposite to each other, the first end is connected to the first balloon, and the second end passes through a wall of the arterial branch tube and protrudes out of the arterial branch tube;

And a joint disposed at the second end of the first connecting tube, wherein the joint is configured to control the switching of the balloon between the expanded state and the contracted state.

Further, the first bag body comprises one of a water bag and an air bag.

Further, the first bladder is configured as a water bladder.

Further, a one-way valve is disposed in the connector, wherein the one-way valve is configured to allow fluid to flow in both directions after the syringe head is inserted, and the valve is closed after the syringe is pulled out, so that the fluid can only flow in the direction of the capsule body through the connector, and the reverse flow is not allowed, so that the capsule body is kept in an inflated state.

Further, the joint is provided with a sealing cap, wherein the sealing cap is detachably connected with the joint.

In some embodiments of the application, the second closure element comprises:

A second balloon disposed on an inner wall of the venous leg, wherein the second balloon is identical in construction to the first balloon;

a third balloon disposed on an inner wall of the venous branch tube for closing the tip hole;

And the second connecting pipe is partially arranged on the inner wall of the venous branch pipe, and the length of the second connecting pipe is longer than that of the first connecting pipe, wherein the second connecting pipe connects the second bag body and the third bag body in series.

The utility model has the beneficial effects that:

1. When the catheter is placed, the catheter (including the arterial branch and the venous branch) is placed into the central vein of the human body through the guide wire percutaneously using seldinger technology. When in treatment, the first sealing element and the second sealing element are in a contracted state, so that the arterial branch pipe and the vein catheterization cavity are kept unobstructed, blood of a patient is led out through the arterial branch pipe, and then is sent back to the patient through the vein branch pipe after passing through the hemodialysis/filtration filter and the extracorporeal pipeline, after treatment is finished, the first hole of the arterial branch pipe, the second hole of the vein branch pipe and the tip hole can be sealed through the first sealing element and the second sealing element, thus the blood is prevented from entering the arterial branch pipe and the vein branch pipe under the condition that hemodialysis/filtration is not carried out, and thrombus is prevented from being formed in the arterial branch pipe and the vein branch pipe.

2. By arranging the first sealing element and the second sealing element, the arterial branch pipe and the venous branch pipe are sealed, compared with the traditional pipe sealing mode, the use of anticoagulant medicine solution is saved, anticoagulant medicine is prevented from entering circulation, the coagulation function of a patient is affected, and the risk of bleeding events can be caused by serious patients.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a schematic diagram of the structures of the artery branch pipe and the vein branch pipe of the present utility model;

FIG. 3 is a schematic view of the inner structures of the first and second proximal ends of the present utility model;

FIG. 4 is a schematic view of the first and second bladder structures of the present utility model;

FIG. 5 is a schematic view of the present utility model after the first and second holes are closed;

FIG. 6 is a schematic view of the first bladder of the present utility model disposed along a first hole;

FIG. 7 is a schematic view of another embodiment of the first bladder and the second bladder of the present utility model;

FIG. 8 is a schematic view of a joint structure according to the present utility model;

FIG. 9 is a schematic view of the internal structure of the joint according to the present utility model;

FIG. 10 is a schematic view of an alternative embodiment of the arterial branch and venous branch of the present utility model;

FIG. 11 is a schematic view of a first hole and a second hole of the present utility model;

FIG. 12 is a schematic view of the position structures of the first and second capsules according to the present utility model;

FIG. 13 is a schematic view of a pipe body according to the present utility model;

In the figure, 1, an arterial branch pipe, 11, a first distal end, 12, a first hole, 13, a first capsule, 14, a connecting pipe, 15, a joint, 151, a pore canal, 1511, a sleeve, 1512, a through hole, 152, a one-way valve, 153, a sealing cap, 2, a venous branch pipe, 21, a second distal end, 22, a second hole, 221, a tip hole, 23, a second capsule, 24, a third capsule, 3, a conduit clip and 4, a tube body.

Detailed Description

The following detailed description of the embodiments of the present utility model will be made more apparent to those skilled in the art from the following detailed description, in which the utility model is embodied in several, but not all, embodiments of the utility model. The utility model may be embodied or applied in other specific forms and features of the following examples and examples may be combined with each other without conflict, all other examples being contemplated by those of ordinary skill in the art without undue burden from the present disclosure, based on the examples of the utility model.

Fig. 1-4 illustrate the main technical content of this embodiment, and this embodiment provides a closable hemodialysis catheter, which includes:

An arterial branch tube 1 for drawing out intravascular blood, the arterial branch tube 1 having a first distal end 11 and a first hole 12 communicating with each other, wherein the first hole 12 is used for introducing intravascular blood into the arterial branch tube 1, the first hole 12 is located at a free wall of the arterial branch tube 1, wherein the first hole 12 may be provided in one or more, and when the first hole 12 is provided in a plurality, the respective first holes 12 are arranged in an extending direction of the arterial branch tube 1;

The venous branch tube 2 is used for sending blood after passing through the extracorporeal filter and the pipeline back to the blood vessel, the venous branch tube 2 is provided with a second distal end 21, a second hole 22 and a tip hole 221 which are communicated with each other, the venous branch tube 2 and the arterial branch tube 1 are partially adjacent to each other and share an inner side wall, the venous branch tube 2 and the arterial branch tube 1 are not communicated, wherein the dialyzed and filtered blood is sent back through the second hole 22 and the tip hole 221, one or a plurality of identical second holes 22 can be arranged, when the second holes 22 are arranged in a plurality, the first body holes are arranged along the extending direction of the venous branch tube 2, and the tip hole 221 is used for being placed in a pipe and passing through a guide wire.

A first closure element arranged in the arterial branch 1, wherein the first closure element is configured to be able to close off the first orifice 12 of the arterial branch 1;

A second closure element is arranged in the venous branch tube 2, wherein the second closure element is configured to be able to close the second hole 22 and the tip hole 221 of the venous branch tube 2.

In the present embodiment, the catheter (including the arterial branch 1 and the venous branch 2) is percutaneously placed in the central vein (jugular vein, femoral vein, etc.) of the patient. Wherein the first distal end 11 of the arterial branch pipe 1 and the second distal end 21 of the venous branch pipe 2 are externally connected with a hemodialysis/filtration extracorporeal pipeline, wherein blood is led out of a patient through the arterial branch pipe 1 by the first hole 12, dialyzed/filtered by a hemodialysis/filtration instrument, and then sent back into the blood vessel of the patient through the venous branch pipe 2 by the second hole 22 and the tip hole 221.

Referring to fig. 1-3, in the present embodiment, the first distal end 11 of the arterial branch tube 1 and the second distal end 21 of the venous branch tube 2 are separated from each other, and by this arrangement, the connection of the arterial branch tube 1 and the venous branch tube 2 to the hemodialysis/filtration apparatus is facilitated, wherein the first distal end 11 of the arterial branch tube 1 and the second distal end 21 of the venous branch tube 2 are at the same intersection distance, so that at least a portion of the arterial branch tube 1 and the venous branch tube 2 are integrally connected.

Referring to fig. 2 to 4, in the present embodiment, the first hole 12 is formed in the outer wall of the arterial branch 1, i.e., the free wall (i.e., the outer side wall of the arterial branch 1), the second hole 22 is formed in the outer wall of the venous branch 2, i.e., the free wall ((i.e., the outer side wall of the venous branch 2), the tip hole 221 is a tip opening of the venous branch 2, or the first hole 12 is configured as a port of the arterial branch 1 into one end of the human body, wherein the first hole 12 and the first distal end 11 correspond to each other, and the second hole 22/tip hole 221 is configured as a port of the venous branch 2 into one end of the human body, wherein the second hole 22/tip hole 221 and the second distal end 21 correspond to each other.

Referring to fig. 3-4, where the arterial branch 1 further has a first proximal end that may be in a sealed/unobstructed state when the first hole 12 is formed in the outer wall of the arterial branch 1 and the second hole 22 is formed in the outer wall of the venous branch 2, the first hole 12 is adjacent to the first proximal end, the venous branch 2 further has a second proximal end that may be in a closed/unobstructed state, the tip hole 221 and the second hole 22 are adjacent to the second proximal end, wherein the first proximal end and the second proximal end form a tip, the tip hole 221 communicates with blood through a catheter tip, the catheter tip being tapered.

When the catheter is placed, the dialysis/filtration catheter is advanced into the patient's blood vessel through the tip hole 221 and the venous branch tube 2 along the wire previously placed into the target vessel using seldinger techniques.

Referring to fig. 4, more specifically, there is a distance between the first hole 12 and the second hole 22, wherein the distance between the first hole 12 and the tip hole 221 is greater than the distance between the second hole 22 and the tip hole 221, and preferably, the orientation of the first hole 12 is opposite to the orientation of the second hole 22.

Referring to fig. 2-5, in the present embodiment, the first closing element comprises a first balloon 13, a first connecting tube 14 and a joint 15, the first balloon 13 is configured on the inner wall of the arterial branch tube 1, wherein the first balloon 13 has an expanded state and a contracted state, the first connecting tube 14 is partially attached to the inner wall of the arterial branch tube 1, wherein the first connecting tube 14 has a first end and a second end opposite to each other, the first end is connected to the first balloon 13, the second end passes through the wall of the arterial branch tube 1 and extends out of the arterial branch tube 1, and the joint 15 is configured on the second end of the connecting tube 14, wherein the joint 15 is configured to control the first balloon 13 to switch between the expanded state and the contracted state.

Referring to fig. 3-5, more specifically, the first bladder 13 is configured to completely close the first aperture 12 in the inflated condition, and a small portion of the first bladder 13 protrudes out of the first aperture 12 in the inflated condition, or the first bladder 13 is configured to be flush with the outer wall of the arterial branch 1 in the inflated condition, thereby completely isolating blood from the arterial branch 1 and preventing blood from entering the arterial branch 1.

Referring to fig. 1-3 and 8-9, more specifically, the joint 15 has a hole 151, the hole 151 communicates with the connecting tube 14, a check valve 152 is disposed in the hole 151, the check valve 152 is configured to allow fluid/gas to flow in both directions between the joint 15 and the first balloon 13 when the syringe joint 15 is inserted, in practice, when a dialysis/hemofiltration treatment is completed, sterile saline/air equivalent to the volume in the arterial branch 1 is injected into the arterial branch 1 through the distal end of the arterial branch 1, then the arterial branch 1 is clamped, and then saline or air is injected into the first balloon 13 from the hole 151 through the joint 15 by using a syringe, thereby expanding the first balloon 13 to close the first hole 12 of the arterial branch 1, and after the syringe is withdrawn, the check valve 152 and the seal cap 153 cooperate to ensure that the fluid in the first balloon 13 does not flow back/leak, so that the arterial branch 1 is continuously expanded to close the arterial branch 1, and the arterial branch 1 is blocked from blood by the syringe. It is ensured that the arterial branch 1 is closed when the patient is not hemodialysis/filtering, thereby avoiding thrombus formation at the first proximal end of the arterial branch 1.

Referring to fig. 2 and 8-9, in the present embodiment, the joint 15 further has a sealing cap 153, wherein the sealing cap 153 is detachably connected to the joint 15, more specifically, the sealing cap 153 is in threaded connection with the joint 15, and in use, the sealing cap 153 is screwed to the joint 15, and in particular use, but when the patient does not need hemodialysis/filtration, the sealing cap 153 is screwed to the joint 15, so as to avoid the attachment of foreign matters to the joint 15, and further avoid the entry of foreign matters into the connecting tube 14 or the first capsule 13 when the first capsule 13 is converted into the expanded state by the joint 15, so as to prolong the service life of the catheter.

Referring to fig. 4-5 and 8-9, in the present embodiment, the balloon is configured as one of a water balloon and an air balloon, wherein when the balloon is in a contracted state, the balloon is attached to the inner wall of the arterial branch tube 1 and is opposite to the first hole 12, so that the arterial branch tube 1 always has a larger inner diameter to facilitate blood circulation, more specifically, when the balloon is configured as a water balloon, the joint 15 can be externally connected with an injector containing sterile saline, the injector can be used for injecting the liquid into the balloon through the connecting pipe 14 to realize the conversion of the balloon from the contracted state to the expanded state, when the balloon is configured as an air balloon, the joint 15 can be externally connected with an injector for sucking air or inert gas to realize the conversion of the balloon from the contracted state to the expanded state, and furthermore, when the injector is used for injecting the liquid or the gas, the one-way valve 152 is in an opened state, after the pushing action is finished, the one-way valve 152 is reset, so that the balloon can be always kept in the expanded state, preferably, when the first balloon is used as the first balloon is in the first state, and the sterile water balloon is not ruptured when the balloon is in the first state, and the balloon is not ruptured when the first balloon is in the physiological condition is formed.

Referring to fig. 4-5 and 9, more specifically, a sliding arrangement of the sleeve 1511 is provided in the duct 151, wherein the sleeve 1511 has a plurality of through holes 1512, and when the first bag 13 is changed from the expanded state to the contracted state, a syringe containing sterile saline or a syringe sucking air or inert gas is inserted into the duct 151, at this time, the interface end of the syringe abuts against one end of the sleeve 1511, so that the sleeve 1511 slides in the duct 151, and the other end of the sleeve 1511 pushes the check valve 152 open, at this time, the sterile saline or gas in the syringe can be injected into the first bag 13 through the through holes 1512 of the sleeve 1511, so that the first bag 13 is changed from the contracted state to the expanded state, and when the first bag 13 is changed from the expanded state to the contracted state, the empty syringe is inserted into the duct 151, so that the interface end of the syringe abuts against one end of the sleeve 1511, and at this time, the liquid or gas in the first bag 13 can be pumped out through the through holes 1512 on the sleeve 1511, so that the first bag 13 is changed into the contracted state, and then the patient is subjected to hemodialysis and/filtration.

Referring to fig. 4 and 6-7, in the present embodiment, the second closing element is different from the first closing element in that the second closing element includes a second capsule 23 for closing the second hole 22, a third capsule 24 for closing the tip hole 221, and a second connection tube 14 connecting the second capsule 23 and the third capsule 24 in series, and more specifically, the second connection tube 14 included in the second closing element is penetrated out from the wall of the venous branch tube 2, and the penetrating position is mirror image to the penetrating position of the first connection tube 14 included in the first closing element on the wall of the arterial branch tube 1.

More specifically, the second closure element comprises a second balloon 23 and a third balloon 24, a small portion of the same second balloon 23 extending out of the second hole 22 in the inflated state or being flush with the outer wall of the venous branch 2 in the inflated state, and the third balloon 24 completely closing the tip hole 221.

After the dialysis/hemofiltration treatment, the arterial branch tube 1 and the venous branch tube 2 are filled with sterile saline, and then the bag body in the arterial branch tube 1 and the bag body in the venous branch tube 2 are converted into an expanded state, so that the blood residues in the arterial branch tube 1 and the venous branch tube 2 are avoided.

In other embodiments (not shown), the first hole 12 is one of a circle, a diamond, and a parallelogram, and the first capsule 13 is disposed along the edge of the first hole 12, where the first capsule 13 is configured to completely fill the first hole 12 in the expanded state, and when the first capsule 13 is in the contracted state, the first hole 12 is in an open state, and at this time, blood of the patient can enter the arterial branch 1 through the first hole 12, so as to achieve the purpose of drawing blood out of the arterial branch 1, and when the first capsule 13 is in the expanded state, the first hole 12 is completely filled by the capsule, so as to isolate the blood from the arterial branch 1, and prevent the blood from entering the arterial branch 1 to form thrombus.

Similarly, the second hole 22 has the same shape as the first hole 12, and the second bladder 23 is disposed along the edge of the second hole 22, so that in the inflated state, the second bladder 23 closes the second hole 22, while the third bladder 24 is disposed in the same manner, and the third bladder 24 is flush with the tip hole 221 in the inflated state.

Referring to fig. 1-4 and 10, in the present embodiment, a catheter clip 3 is further disposed on the arterial branch 1 near the first distal end 11 and on the venous branch 2 near the second distal end 21, wherein the two catheter clips 3 respectively close the first distal end 11 and the first hole 12 of the arterial branch 1, the second distal end 21 and the second hole 22 of the venous branch 2, and at the end of the treatment, after filling the arterial branch 1 and the venous branch 2 with sterile saline, the two catheter clips 3 are used to close the first distal end 11 and the first hole 12 of the arterial branch 1 and the second distal end 21 and the second hole 22 of the venous branch 2, and then the three capsules are converted from a contracted state to an expanded state, and after closing the arterial branch 1 and the venous branch 2, the catheter clips 3 are released, and the first distal end 11 and the second distal end 21 are closed.

Referring to fig. 10-12, in another embodiment, the first aperture 12 is configured as a port into the body at one end of the arterial branch 1, wherein the first aperture 12 and the first distal end 11 are opposite each other, and the second aperture 22 is configured as a port into the body at one end of the venous branch 2, wherein the second aperture 22 and the second distal end 21 are opposite each other.

More specifically, the length of the arterial branch tube 1 is smaller than the length of the venous branch tube 2, and at this time, the end of the arterial branch tube 1 that enters the human body is located at the outer wall of the venous branch tube 2 so that there is a distance between the first hole 12 and the second hole 22.

Here, the first balloon 13 is arranged along the edge of the first hole 12 and the first balloon 13 is located in the arterial branch 1, wherein the first balloon 13 has a certain length and extends in the direction of the first distal end 11 at the inner wall of the arterial branch 1, more specifically the length of the first balloon 13 may be about 1cm, while in the venous branch 2 the second balloon 23 comprised in the second closure element likewise extends in the direction of the second distal end 21 at the inner wall of the venous branch 2, so that in the expanded state the venous branch 2 is closed.

At the end of the treatment, the arterial branch 1 and the venous branch 2 are similarly filled with sterile saline first, and then the balloon in the arterial branch 1 and the balloon in the venous branch 2 are converted into an inflated state, thereby closing the arterial branch 1 and the venous branch 2.

In addition, the present embodiment may be configured in a single lumen configuration in which the tube body 4 has a tip having a circular hole for blood circulation from this configuration, in which the balloon is disposed in the circular hole of the tip, the same connection tube 14 is disposed on the inner wall of the tube body 4 and passes out near the distal end of the tube body 4, and the connection tube 14 is also provided with a joint 15, and in addition, the catheter clip 3 is also disposed near the distal end of the tube body 4.

In addition, referring to fig. 13, the present embodiment includes, but is not limited to, the arrangement shown in the drawings when implemented.

The application method of the utility model comprises the following steps:

1. When the catheter is placed, the dialysis/filtration catheter is pushed into the patient's blood vessel through the tip hole and venous branch tube along the metal guide wire previously placed into the target blood vessel using seldinger techniques. And securing the catheter to the skin by a suturing operation;

2. When hemodialysis/filtration is carried out on a patient, the first distal end of the arterial branch pipe and the second distal end of the venous branch pipe are externally connected with a hemodialysis/filtration instrument;

3. After hemodialysis/filtration of a patient is completed, the arterial branch pipe and the venous branch pipe are filled with sterile saline, and then the first distal end of the arterial branch pipe and the second distal end of the venous branch pipe are respectively closed through a conduit clamp;

4. After the arterial branch and the venous branch are closed, the joint of the first closing element and the second closing element is sealed by a sealing cap.

The above description of embodiments is only for the understanding of the present utility model. It should be noted that it will be apparent to those skilled in the art that modifications can be made to the present utility model without departing from the principles of the utility model, and such modifications will fall within the scope of the claims.

Claims (10)

1. A closable hemodialysis filtration catheter, characterized in that it comprises:

An arterial branch tube for drawing arterial blood, the arterial branch tube having a first distal end and a first bore in communication with each other, wherein the first bore is for introducing arterial blood into the arterial branch tube;

The venous branch pipe is used for sending the dialyzed and filtered blood back from a vein of a patient, and is provided with a second far end, a second hole and a tip hole which are communicated with each other, wherein the venous branch pipe and the arterial branch pipe are adjacent to each other and are not communicated with each other, and the dialyzed and filtered blood is sent back into the body from the second hole and the tip hole;

A first closure element disposed within the arterial branch, wherein the first closure element is configured to be capable of closing the first aperture of the arterial branch;

A second closure element disposed within the venous leg, wherein the second closure element is configured to be capable of closing the second aperture and the tip aperture of the venous leg.

2. The closable hemodiafiltration catheter of claim 1, wherein the first aperture is formed in an outer wall of the arterial branch and the second aperture is formed in an outer wall of the venous branch.

3. The closable hemodiafiltration catheter of claim 2, wherein a distance exists between the first aperture and the second aperture, wherein the first aperture and the second aperture are oppositely oriented.

4. The closable hemodiafiltration catheter of claim 1, wherein the at least one of the plurality of blood cells comprises,

The first bore is configured as a port for the arterial branch tube into an intravascular end, wherein the first bore and the first distal end correspond to each other;

The tip aperture is configured as a port of the venous leg into an intravascular end, wherein the tip aperture and the second distal end correspond to each other, the second aperture is located between the tip aperture and the second distal end, and the second aperture is proximate to the tip aperture.

5. The closable hemodiafiltration catheter according to any of claims 2-4, wherein,

The first closure element comprises:

A first balloon disposed on an inner wall of the arterial branch, wherein the first balloon has an expanded state in which the first aperture is closed and a contracted state;

A first connecting tube partially attached to an inner wall of the arterial branch tube, wherein the first connecting tube has a first end and a second end opposite to each other, the first end is connected to the first balloon, and the second end passes through a wall of the arterial branch tube and protrudes out of the arterial branch tube;

And a joint disposed at the second end of the first connecting tube, wherein the joint is configured to control the switching of the balloon between the expanded state and the contracted state.

6. The closable hemodiafiltration catheter of claim 5, wherein the first balloon comprises one of a water balloon and a balloon.

7. The closable hemodiafiltration catheter of claim 6, wherein the first balloon is configured as a water balloon.

8. The closable hemodialysis catheter according to claim 5, wherein a one-way valve is disposed within the connector, wherein the one-way valve is configured to permit bi-directional fluid flow upon insertion of the syringe tip, and wherein the one-way valve closes upon withdrawal of the syringe, fluid can only flow from the connector in the direction of the balloon without permitting reverse flow, thereby maintaining the balloon in an inflated state.

9. The closable hemodialysis catheter according to claim 5, wherein the fitting further has a sealing cap, wherein the sealing cap is detachably connected to the fitting.

10. The closable hemodiafiltration catheter of claim 5, wherein the at least one of the plurality of blood cells comprises,

The second closure element comprises:

A second balloon disposed on an inner wall of the venous leg, wherein the second balloon is identical in construction to the first balloon;

a third balloon disposed on an inner wall of the venous branch tube for closing the tip hole;

And the second connecting pipe is partially attached to the inner wall of the venous branch pipe, and the length of the second connecting pipe is longer than that of the first connecting pipe, wherein the second connecting pipe connects the second bag body and the third bag body in series.