CN112386757A - Hemodialysis catheter and production method thereof - Google Patents

Abstract

The invention discloses a hemodialysis catheter and a production method thereof, wherein the hemodialysis catheter comprises a catheter body, one end of the catheter body is a head end, the other end of the catheter body is a tail end, a first guide hole and a second guide hole are arranged on the end face of the head end along the length extension direction of the catheter body, a separation rib is arranged between the first guide hole and the second guide hole and divides the interior of the catheter body into a first guide cavity and a second guide cavity in equal parts, a guide channel is arranged in the separation rib and penetrates through the catheter body along the length direction of the catheter body, a first opening and a second opening are arranged on the outer side wall of the catheter body, a first extension tube is communicated with the first guide hole, a second extension tube is communicated with the second guide hole, and the guide channel is communicated with the guide tube, so that the hemodialysis catheter has more various functions, the use is more flexible, and the practicability in clinical medicine can be effectively improved.

Description

Hemodialysis catheter and production method thereof

Technical Field

The invention relates to a medical instrument, in particular to a hemodialysis catheter and a production method thereof.

Background

The hemodialysis catheter is an intravascular catheter for dialysis treatment, generally, puncture is carried out from subclavian vein, internal jugular vein or femoral vein for placing the catheter, the hemodialysis catheter is connected with an extracorporeal circulation blood loop, a hemodialysis machine and a hemodialyzer during dialysis treatment, blood flows out from the arterial end of the hemodialysis catheter and enters the dialyzer through the arterial pipeline of the blood loop, the dialyzer filters impurities in the blood by utilizing the molecular dispersion effect and adjusts ion balance, finally enters the venous end of the hemodialysis catheter through the venous pipeline of the blood loop and returns to a human body to form circulation, during clinical treatment, a guide wire is placed into a blood vessel through puncture, the hemodialysis catheter is pushed into the blood vessel along the guide wire, and finally the guide wire is taken out from the hemodialysis catheter to complete catheter placement. The existing hemodialysis catheter is usually of a double-cavity structure, can only perform a simple dialysis treatment effect, and is single in function and poor in use experience.

Disclosure of Invention

The present invention is directed to a hemodialysis catheter and a method for manufacturing the same, which solves one or more of the problems of the prior art and provides at least one of the advantages of the present invention.

The solution of the invention for solving the technical problem is as follows:

a hemodialysis catheter comprises a catheter body, wherein one end of the catheter body is a head end, the other end of the catheter body is a tail end, the end surface of the head end is provided with a first guide hole and a second guide hole along the length extending direction of the pipe body, a partition rib is arranged between the first guide hole and the second guide hole, the partition rib equally divides the interior of the pipe body into a first guide cavity and a second guide cavity, a guide channel is arranged in the separating rib, the guide channel runs through the pipe body along the length direction of the pipe body, the outer side wall of the pipe body is provided with a first opening and a second opening, the first opening is communicated with the first guide hole, the second opening is communicated with the second guide hole, the first guide hole is communicated with a first extension tube, the second guide hole is communicated with a second extension tube, and the guide channel is communicated with a guide tube.

The technical scheme at least has the following beneficial effects: three mutually independent spaces are arranged in the tube body, namely, guide channels positioned on the separating ribs, a first guide hole and a second guide hole positioned at two sides of the separating ribs, two ends of the guide channels are in a conduction state, one end of the first guide hole far away from the orifice of the first guide hole is communicated with the first opening, one end of the second guide hole far away from the orifice of the second guide hole is communicated with the second opening, when the tube is placed, a guide wire can penetrate into the guide channels and extend out of the guide tube, the first guide hole and the second guide hole can be respectively used as channels for blood inflow and blood outflow, the first extension tube and the second extension tube can conveniently connect the tube body to an external device so as to enable the blood to flow in and flow out, and during the dialysis process, the operations of transfusion, blood drawing and the like can be carried out through the guide tube, the use is more convenient, therefore, the invention has more various functions and more flexible use, can effectively improve the practicability in clinical medicine.

As a further improvement of the above technical solution, the orientation of the first opening is opposite to the orientation of the second opening. The flowing-in direction and the flowing-out direction of the blood are opposite, the condition that the blood flows back to the tube body immediately after flowing out from the tube body can be reduced, and the dialysis treatment efficiency can be improved.

As a further improvement of the above technical solution, an inner wall surface of the first guide hole facing the first opening is a first guide surface, and the first guide surface is inclined in a direction from the head end to the tail end in a direction approaching the first opening. The inclined design of first guide surface can play the guide effect to the inflow of blood for deviate from the second opening when blood gathers the inflow from first opening, further reduce the condition emergence that blood flowed out from the body and flowed into the body of flowing back immediately.

As a further improvement of the above technical solution, an inner wall surface of the second guide hole facing the second opening is a second guide surface, and the second guide surface is inclined in a direction from the head end to the tail end in a direction approaching the second opening. Similarly, the inclined design of the second guide surface can guide the outflow of blood, so that the blood flows out from the second opening along the guide of the second guide surface and deviates from the first opening, and the situation that the blood flows back into the tube body from the tube body immediately after flowing out is further reduced.

As a further improvement of the above technical solution, the end is connected with a connecting seat, and the first extension tube, the second extension tube and the guide tube are respectively connected to the connecting seat. The connecting seat can enable the first extension tube, the second extension tube and the guide tube to be connected to the connecting seat more conveniently.

As a further improvement of the above technical solution, a first pipe clamp is arranged on the first extension pipe, a second pipe clamp is arranged on the second extension pipe, and a third pipe clamp is arranged on the guide pipe. The first pipe clamp can be used for opening or closing the first extension pipe to control the on-off of the first extension pipe, similarly, the second pipe clamp can be used for opening or closing the second extension pipe to control the on-off of the second extension pipe, and the third pipe clamp can be used for opening or closing the guide pipe to control the on-off of the guide pipe.

As a further improvement of the above technical solution, a first pipe joint is arranged at one end of the first extension pipe, which is far away from the pipe body, a second pipe joint is arranged at one end of the second extension pipe, which is far away from the pipe body, and a third pipe joint is arranged at one end of the guide pipe, which is far away from the pipe body. The first pipe joint can be used for conveniently connecting the peripheral pipeline to the first extension pipe, the second pipe joint can be used for conveniently connecting the peripheral pipeline to the second extension pipe, and the third pipe joint can be used for conveniently connecting the peripheral pipeline to the pipe body.

A method of manufacturing a hemodialysis catheter, comprising the steps of: step S1: inserting a pipe body into a forming cavity formed in one side surface of a forming mold, heating the forming mold to enable a part of a guide pipe inserted into the forming cavity to be heated to a molten state, and inserting a forming core into a forming channel formed in the other side surface of the forming mold, wherein the forming core extends into the forming cavity along the central line of the forming cavity; step S2: inserting a first core pin and a second core pin into the molding cavity, wherein the positions of the first core pin and the second core pin in the molding cavity are symmetrical with each other about the molding core; step S3: cooling and forming; step S4: demolding to obtain a semi-finished product; step S5: and (4) forming a hole on the outer side wall of the semi-finished product to obtain the hemodialysis catheter.

The technical scheme at least has the following beneficial effects: the method comprises the steps of firstly inserting a pipe body into a forming cavity, heating a forming die, heating the part of the pipe body inserted into the forming cavity to a molten state, then inserting a forming core, wherein the forming core can obtain the shape of a guide channel, then inserting a first core needle and a second core needle into the forming cavity, forming a first guide hole and a second guide hole at the positions of the first core needle and the second core needle respectively, forming a separation rib between the first core needle and the second core needle, obtaining a semi-finished product after cooling forming, and obtaining a first opening and a second opening through hole opening respectively, so that the hemodialysis catheter can be obtained, wherein three mutually independent channels are arranged in the hemodialysis catheter.

As a further improvement of the above technical solution, the first core pin is a semi-annular cylinder, the top side of the first core pin is provided with an arc-shaped section, the arc-shaped section extends to the bottom side of the end portion of the first core pin, and in step S2, when the first core pin is inserted into the molding cavity, the arc-shaped section faces the molding cavity. The arc-shaped section of the first core needle enables the first guide hole to form an inclined first guide surface design during molding, so that the trouble of post-processing is eliminated, and the whole production and manufacturing are more convenient.

As a further improvement of the above technical solution, the structure of the second core pin is symmetric with the structure of the first core pin with respect to the molding core. The structure of first core needle is the same with the structure of second core needle, and the mould is made and is saved cost, convenience more, when using, only need rotate 180 degrees with first core needle wound core, can reach the required structure of second core needle, and is same, the arc tangent plane shape of second core needle for the second guide hole has formed the second guide surface design of slope when the shaping promptly, has saved the trouble of later stage processing, and whole manufacturing is more convenient.

Drawings

In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures are only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from them without inventive effort.

FIG. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic structural view of the head end of the pipe body of the present invention;

FIG. 3 is a schematic view of the cross-sectional structure A-A of FIG. 2;

FIG. 4 is a schematic view of the end structure of the tube of the present invention;

FIG. 5 is a schematic view of a molding die structure of the present invention;

FIG. 6 is a schematic view of the first core pin and the second core pin according to the present invention.

In the drawings: 100-pipe body, 110-first guide hole, 120-second guide hole, 130-partition rib, 140-guide channel, 150-first opening, 160-second opening, 170-second guide surface, 200-first extension pipe, 300-second extension pipe, 400-guide pipe, 510-first pipe clamp, 520-second pipe clamp, 530-third pipe clamp, 610-first pipe joint, 620-second pipe joint, 630-third pipe joint, 700-connecting seat, 810-forming die, 811-forming cavity, 812-forming channel, 820-first core needle, 821-arc section and 830-second core needle.

Detailed Description

The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the connection relations mentioned herein do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.

Referring to fig. 1, a hemodialysis catheter includes a tube body, one end of the tube body is a head end, the other end of the tube body is a tail end, the end surface of the head end is provided with a first guide hole and a second guide hole along the length extending direction of the pipe body, a partition rib is arranged between the first guide hole and the second guide hole, the partition rib equally divides the interior of the pipe body into a first guide cavity and a second guide cavity, a guide channel is arranged in the separating rib, the guide channel runs through the pipe body along the length direction of the pipe body, the outer side wall of the pipe body is provided with a first opening and a second opening, the first opening is communicated with the first guide hole, the second opening is communicated with the second guide hole, the first guide hole is communicated with a first extension tube, the second guide hole is communicated with a second extension tube, and the guide channel is communicated with a guide tube.

It can be known from the above that, three mutually independent spaces are provided in the tube body, which are respectively a guide channel on the separating rib, a first guide hole and a second guide hole on both sides of the separating rib, both ends of the guide channel are in a conducting state, one end of the first guide hole far away from the orifice thereof is communicated with the first opening, one end of the second guide hole far away from the orifice thereof is communicated with the second opening, when the tube is placed, a guide wire can be inserted into the guide channel and extend out of the guide tube, the first guide hole and the second guide hole can be respectively used as a channel for blood inflow and blood outflow, the first extension tube and the second extension tube can conveniently connect the tube body to an external device so as to make the blood flow in and out, during the dialysis process, the operations such as transfusion and blood drawing can be performed through the guide tube, the use is more convenient, therefore, the functions of the invention are more various, the use is more flexible, and the practicability in clinical medicine can be effectively improved.

When the hemodialysis catheter performs dialysis treatment, after blood enters the tube body, the blood is dialyzed by the extracorporeal circulation blood circuit and then returns to the venous blood tube from the tube body, and if the blood flows out of the tube body and then enters the tube body immediately and flows to the extracorporeal circulation blood circuit, the phenomenon is called recirculation. The recirculation rate is an evaluation index of the dialysis treatment efficiency, the lower the recirculation rate is, the better the dialysis treatment effect is, and conversely, the lower the dialysis treatment efficiency is, and in order to reduce the recirculation rate, in this embodiment, the first opening is oriented in the opposite direction to the second opening. The flowing-in direction and the flowing-out direction of the blood are opposite, the condition that the blood flows back to the tube body immediately after flowing out from the tube body can be reduced, and the dialysis treatment efficiency can be improved.

In order to further reduce the recirculation rate, in this embodiment, an inner wall surface of the first guide hole facing the first opening is a first guide surface, and the first guide surface is inclined in a direction from the head end to the tail end in a direction approaching the first opening. The inclined design of first guide surface can play the guide effect to the inflow of blood for deviate from the second opening when blood gathers the inflow from first opening, further reduce the condition emergence that blood flowed out from the body and flowed into the body of flowing back immediately.

In order to further reduce the recirculation rate, in this embodiment, an inner wall surface of the second guide hole facing the second opening is a second guide surface, and the second guide surface is inclined in a direction from the head end to the tail end in a direction approaching the second opening. Similarly, the inclined design of the second guide surface can guide the outflow of blood, so that the blood flows out from the second opening along the guide of the second guide surface and deviates from the first opening, and the situation that the blood flows back into the tube body from the tube body immediately after flowing out is further reduced.

In order to connect the tube body to other pipelines, in this embodiment, the end is connected to a connecting seat, and the first extension tube, the second extension tube and the guiding tube are respectively connected to the connecting seat. The connecting seat can enable the first extension tube, the second extension tube and the guide tube to be connected to the connecting seat more conveniently.

In practical application, the on-off of blood in the first extension tube, the second extension tube and the guide tube needs to be controlled, so in this embodiment, a first pipe clamp is arranged on the first extension tube, a second pipe clamp is arranged on the second extension tube, and a third pipe clamp is arranged on the guide tube. The first pipe clamp can be used for opening or closing the first extension pipe to control the on-off of the first extension pipe, similarly, the second pipe clamp can be used for opening or closing the second extension pipe to control the on-off of the second extension pipe, and the third pipe clamp can be used for opening or closing the guide pipe to control the on-off of the guide pipe.

In some embodiments, the end of the first extension tube away from the tube body is provided with a first tube joint, the end of the second extension tube away from the tube body is provided with a second tube joint, and the end of the guide tube away from the tube body is provided with a third tube joint. The first pipe joint can be used for conveniently connecting the peripheral pipeline to the first extension pipe, the second pipe joint can be used for conveniently connecting the peripheral pipeline to the second extension pipe, and the third pipe joint can be used for conveniently connecting the peripheral pipeline to the pipe body.

As shown in fig. 5, a method for manufacturing a hemodialysis catheter includes the steps of: step S1: inserting a pipe body into a forming cavity formed in one side surface of a forming mold, heating the forming mold to enable a part of a guide pipe inserted into the forming cavity to be heated to a molten state, and inserting a forming core into a forming channel formed in the other side surface of the forming mold, wherein the forming core extends into the forming cavity along the central line of the forming cavity; step S2: inserting a first core pin and a second core pin into the molding cavity, wherein the positions of the first core pin and the second core pin in the molding cavity are symmetrical with each other about the molding core; step S3: cooling and forming; step S4: demolding to obtain a semi-finished product; step S5: and (4) forming a hole on the outer side wall of the semi-finished product to obtain the hemodialysis catheter.

The tube body inserted into the forming cavity is a tube with only a single channel, such as a single-channel hose, the end part of the tube body is required to be processed into a three-channel tube body, in the production method, the tube body is firstly inserted into the forming cavity, the forming mold is heated, the part of the tube body inserted into the forming cavity is heated to a molten state, then the forming core is inserted, the forming core can obtain the shape of a guide channel, then the first core needle and the second core needle are inserted into the forming cavity, the first guide hole and the second guide hole are respectively formed at the positions of the first core needle and the second core needle, a separation rib is formed between the first core needle and the second core needle, a semi-finished product is obtained after cooling forming, a first opening and a second opening are respectively obtained through hole forming, and thus the hemodialysis catheter can be obtained, and the hemodialysis catheter has three mutually independent channels.

In order to make the entire production method more efficient, as shown in fig. 6, in this embodiment, the first core pin is a semi-circular cylinder, the top side of the first core pin is provided with an arc-shaped section, and the arc-shaped section extends to the end bottom side of the first core pin, and the arc-shaped section faces the molding cavity when the first core pin is inserted into the molding cavity in step S2. The arc-shaped section of the first core needle enables the first guide hole to form an inclined first guide surface design during molding, so that the trouble of post-processing is eliminated, and the whole production and manufacturing are more convenient.

Also, in order to make the entire production method more efficient, in the present embodiment, the structure of the second core pin is symmetric with respect to the structure of the first core pin and the forming core. The structure of first core needle is the same with the structure of second core needle, and the mould is made and is saved cost, convenience more, when using, only need rotate 180 degrees with first core needle wound core, can reach the required structure of second core needle, and is same, the arc tangent plane shape of second core needle for the second guide hole has formed the second guide surface design of slope when the shaping promptly, has saved the trouble of later stage processing, and whole manufacturing is more convenient.

While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.

Claims (10)

1. A hemodialysis catheter, comprising: the pipe comprises a pipe body, wherein one end of the pipe body is a head end, the other end of the pipe body is a tail end, a first guide hole and a second guide hole are formed in the end face of the head end along the length extending direction of the pipe body, a partition rib is arranged between the first guide hole and the second guide hole and divides the interior of the pipe body into a first guide cavity and a second guide cavity in equal parts, a guide channel is arranged in the partition rib, the guide channel penetrates through the pipe body along the length direction of the pipe body, a first opening and a second opening are formed in the outer side wall of the pipe body, the first opening is communicated with the first guide hole, the second opening is communicated with the second guide hole, the first guide hole is communicated with a first extension pipe, the second guide hole is communicated with a second extension pipe, and the guide channel is communicated with a guide pipe.

2. A hemodialysis catheter according to claim 1, wherein: the first opening is oriented opposite the second opening.

3. A hemodialysis catheter according to claim 2, wherein: the inner wall surface of the first guide hole, which faces the first opening, is a first guide surface, and the first guide surface is inclined from the head end to the tail end in a direction close to the first opening.

4. A hemodialysis catheter according to claim 2, wherein: the inner wall surface of the second guide hole facing the second opening is a second guide surface, and the second guide surface is inclined from the head end to the tail end in a direction close to the second opening.

5. A hemodialysis catheter according to claim 2, wherein: the tail end is connected with a connecting seat, and the first extension tube, the second extension tube and the guide tube are respectively connected to the connecting seat.

6. A hemodialysis catheter according to claim 2, wherein: the first extension pipe is provided with a first pipe clamp, the second extension pipe is provided with a second pipe clamp, and the guide pipe is provided with a third pipe clamp.

7. A hemodialysis catheter according to claim 2, wherein: the end, far away from the body, of the first extension tube is provided with a first tube joint, the end, far away from the body, of the second extension tube is provided with a second tube joint, and the end, far away from the body, of the guide tube is provided with a third tube joint.

8. A method of manufacturing a hemodialysis catheter, comprising: the method comprises the following steps:

step S1: inserting a pipe body into a forming cavity formed in one side surface of a forming mold, heating the forming mold to enable a part of a guide pipe inserted into the forming cavity to be heated to a molten state, and inserting a forming core into a forming channel formed in the other side surface of the forming mold, wherein the forming core extends into the forming cavity along the central line of the forming cavity;

step S2: inserting a first core pin and a second core pin into the molding cavity, wherein the positions of the first core pin and the second core pin in the molding cavity are symmetrical with each other about the molding core;

step S3: cooling and forming;

step S4: demolding to obtain a semi-finished product;

step S5: opening a hole on the outer side wall of the semi-finished product, resulting in a hemodialysis catheter according to any of claims 1 to 7.

9. A method of manufacturing a hemodialysis catheter according to claim 8, comprising: the first core pin is a semi-annular cylinder, the top side of the first core pin is provided with an arc-shaped tangent plane, the arc-shaped tangent plane extends to the bottom side of the end part of the first core pin, and in the step S2, when the first core pin is inserted into the molding cavity, the arc-shaped tangent plane faces the molding cavity.

10. A method of manufacturing a hemodialysis catheter according to claim 9, comprising: the structure of the second core needle is mutually centrosymmetric about the structure of the forming core and the structure of the first core needle.

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