CN215386368U

CN215386368U - Hemodialysis catheter

Info

Publication number: CN215386368U
Application number: CN202120955571.6U
Authority: CN
Inventors: 李洁; 胡培航; 邹方强; 刘林; 陈昌文; 康欢; 王宝龙; 魏学标; 王首红; 廖游玩
Original assignee: Guangdong General Hospital
Current assignee: Guangdong General Hospital
Priority date: 2021-05-06
Filing date: 2021-05-06
Publication date: 2022-01-04
Anticipated expiration: 2031-05-06

Abstract

The utility model relates to the technical field of medical instruments and discloses a hemodialysis catheter which comprises a catheter body, wherein a blood leading port and a blood returning port are arranged at the front end of the catheter body, a first channel communicated with the blood leading port and a second channel communicated with the blood returning port are arranged in the catheter body, at least 3 columnar bags are arranged near the blood leading port and are arranged at intervals around the circumference of the catheter body, a third channel communicated with the inner cavity of each columnar bag is arranged in the catheter body, a sealing valve is arranged at the rear end of the third channel and is used for injecting fluid into the third channel and closing the sealing valve, and gaps among the expanded columnar bags can provide enough space for blood circulation, so that discomfort of a patient caused by the fact that the balloon occupies an overlarge cross section in a blood vessel is avoided; and the column bag can provide bigger support height, and two at least column bags will draw the blood mouth to support to keeping away from vascular wall department, have avoided current utricule support height to hang down the blood mouth that draws that leads to and draw blood unsmooth.

Description

Hemodialysis catheter

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a hemodialysis catheter.

Background

Hemodialysis is the primary treatment for patients with acute or chronic renal failure by draining blood from the body into dialyzers to remove metabolic wastes and maintain electrolyte and acid-base balance. The hemodialysis catheter is a channel for connecting a human blood vessel and a dialyzer, when hemodialysis treatment is carried out, blood of a patient is firstly led out from a blood leading port of the hemodialysis catheter, then the dialyzer carries out dialysis on the blood, and the blood treated by the dialyzer is returned into a human body from a blood returning port of the hemodialysis catheter.

The direction of the hemodialysis tube inserted into the blood vessel is consistent with the blood flow direction, the blood leading port is arranged on the side wall of the hemodialysis tube, and the opening faces the side wall of the blood vessel and is positioned at the upstream position in the blood flow direction; the blood return port is arranged at the end part of the hemodialysis tube, the opening faces to the blood flow direction, the downstream position in the blood flow direction is arranged, the dialyzed blood can be prevented from flowing back to the drainage port for dialysis again, ineffective circulation occurs, however, the artery port of the hemodialysis catheter is arranged on the side wall of the catheter, when the artery port is attached to the wall of the blood vessel, the blood guide is not smooth, the position of the hemodialysis catheter is required to be adjusted by medical personnel continuously, blood pump stopping caused by blood guide termination in serious cases can lead to coagulation, blood purification termination is forced, the workload of nursing personnel is increased, and the hemodialysis efficiency is reduced.

In order to solve the technical problem of adherence of the hemodialysis tube, a spherical wall-sticking-preventing air bag is arranged between the blood leading port and the blood returning port, and the air bag is filled with liquid or inflated after the tube is placed, so that the air bag radially expands along the hemodialysis tube, the blood leading port is limited by the air bag to be far away from the wall of the blood vessel, and the adherence of the blood leading port is avoided.

The technical problem of hemodialysis pipe guide vessel adherence has been solved to above-mentioned technical scheme, however, has following problem in the use: in order to ensure smooth blood flow in a blood vessel placed in a hemodialysis tube, the occupied area of the hemodialysis catheter in the blood vessel needs to be as small as possible, so that the injection amount in the balloon cannot be too large, the balloon can protrude out of the hemodialysis tube to be small in height, the supporting height is low, the hemodialysis catheter can swing in the blood vessel under the influence of external factors such as the body state of a patient and cannot be kept at the center of the blood vessel all the time, and when a blood leading port swings to be close to the blood vessel wall, unsmooth blood leading can be caused; when the liquid injection amount in the balloon is increased, the occupied area of the balloon in a blood vessel is increased, the blood circulation area in the blood vessel is reduced, and discomfort of a patient is caused.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: the utility model discloses a hemodialysis pipe sets up prevents that adherence sacculus liquid injection volume is little support height is low, when drawing blood mouthful swing to being close to vascular wall department, can lead to drawing blood unobstructed, when increasing the interior injection liquid volume of sacculus, the utricule is big at endovascular occupation area, can lead to the reduction of blood circulation area in the blood vessel, arouses the patient discomfort.

In order to solve the technical problem, the utility model provides a hemodialysis catheter, which comprises a catheter body, wherein a blood leading port and a blood returning port are arranged at the front end of the catheter body, and a first channel communicated with the blood leading port and a second channel communicated with the blood returning port are arranged in the catheter body;

a third channel is further arranged in the tube body, a sealing valve is arranged at the rear end of the third channel, and the front end of the third channel is communicated with the inner cavity of each columnar capsule.

As a preferred scheme, an annular flange is coaxially arranged on the pipe body, an annular cavity is arranged in the annular flange, and the annular cavity is communicated with the third channel;

each columnar capsule is fixedly connected to the annular flange, and the annular cavity is communicated with the inner cavity of each columnar capsule.

Preferably, the blood introducing port is positioned on the side wall of the tube body, and the blood returning port is positioned in the middle of the front end wall of the tube body;

a circular tube is coaxially arranged in the tube body, and the inner cavity of the circular tube is the second channel;

a first interlayer and a second interlayer which are parallel to the axis of the pipe body are arranged between the inner wall of the pipe body and the outer wall of the round pipe, the first interlayer and the second interlayer divide an annular region between the inner wall of the pipe body and the outer wall of the round pipe into a first cavity and a second cavity, the sectional area of the first cavity is the same as that of the inner cavity of the round pipe, the first cavity is the first channel, and the second cavity is the third channel;

and a through hole is formed in the side surface of the third channel and communicates the third channel with the annular cavity.

Preferably, a distance between an edge of each of the columnar capsules and an edge of the blood introduction port is 0.5cm or more and 3cm or less.

Preferably, the columnar balloons are cylindrical with a ratio of length to diameter larger than that of the columnar balloons, and the length of each columnar balloon is equal to the difference between the inner diameter of the blood vessel and the outer diameter of the tube body.

Preferably, supporting legs extending outwards in the radial direction of the columnar bags are arranged at one end, away from the tube body, of each columnar bag, and arc surfaces matched with the inner wall of the blood vessel are arranged at one ends, close to the inner wall of the blood vessel, of the supporting legs.

As a preferable scheme, the rear end of the tube body is provided with a blood leading tube, a blood returning tube and a liquid injection tube, the front end of the blood leading tube is connected with the first channel, the rear end of the blood leading tube is connected with a dialyzer, the front end of the blood returning tube is connected with the second channel, and the rear end of the blood returning tube is connected with the dialyzer;

the liquid injection pipe is connected with the third channel, the sealing valve is a one-way valve, and the one-way valve is arranged on the liquid injection pipe.

Preferably, the end part of the liquid injection pipe is provided with a plug cover.

Compared with the prior art, the hemodialysis tube has the beneficial effects that:

the hemodialysis catheter comprises a catheter body, wherein a blood leading port and a blood returning port are arranged at the front end of the catheter body, a first channel communicated with the blood leading port and a second channel communicated with the blood returning port are arranged in the catheter body, at least 3 columnar bags are arranged near the blood leading port and are arranged at intervals around the circumference of the catheter body, a third channel is arranged in the catheter body, a sealing valve is arranged at the rear end of the third channel, the front end of the third channel is communicated with the inner cavity of each columnar bag, after the catheter is placed, fluid is injected into the third channel and the sealing valve is closed, gaps among the expanded columnar bags can provide enough space for blood circulation, and discomfort of a patient caused by the fact that the balloon body occupies an overlarge cross section in a blood vessel is avoided; and the column bag can provide bigger support height, and two at least column bags will draw the blood mouth to support to keeping away from vascular wall department, have avoided current utricule support height to hang down the blood mouth that draws that leads to and draw blood unsmooth.

Drawings

FIG. 1 is a front view of a hemodialysis catheter in accordance with an embodiment of the present invention;

FIG. 2 is a cross-sectional view taken at A-A in FIG. 1;

FIG. 3 is a cross-sectional view taken at B-B of FIG. 1;

in the figure, 1, a tube body; 11. a blood drainage port; 12. a blood return port; 13. a first channel; 14. a second channel; 15. a third channel; 2. a columnar sac; 21. supporting legs; 22. an annular flange; 221. an annular inner cavity; 3. a circular tube; 4. a first barrier layer; 5. a second barrier layer; 6. leading a blood vessel; 61. a first pipe clamp; 7. a blood return vessel; 71. a second pipe clamp; 8. a liquid injection pipe; 81. a sealing valve; 82. and (6) plugging the cap.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.

As shown in fig. 1 to 3, a hemodialysis catheter according to a preferred embodiment of the present invention includes a catheter body 1, a blood introducing port 11 and a blood returning port 12 are provided at a front end of the catheter body 1, a first channel 13 communicated with the blood introducing port 11 and a second channel 14 communicated with the blood returning port 12 are provided in the catheter body 1, and the hemodialysis catheter is characterized in that at least 3 columnar capsules 2 are further provided near the blood introducing port 11, and each columnar capsule 2 is arranged around a circumference of the catheter body 1 at intervals; a third channel 15 is further arranged in the tube body 1, a sealing valve 81 is arranged at the rear end of the third channel 15, and the front end of the third channel 15 is communicated with the inner cavity of each cylindrical capsule 2 so as to inject fluid into each cylindrical capsule 2.

Specifically, the direction of inserting the hemodialysis tube into a blood vessel is consistent with the blood flow direction, the blood leading port 11 and the blood return port 12 are both arranged at the end part of the tube body 1, wherein the blood leading port 11 is arranged behind the blood return port 12; the blood return port 12 is provided on the front end wall of the tube body 1, so that it is possible to prevent the occurrence of ineffective circulation due to the backflow of blood through dialysis such as dialysis again through the drainage port. At least 3 columnar bags 2 are arranged near the blood leading port, the inner cavity of each columnar bag 2 is communicated with the third channel 15, when fluid is injected into the third channel 15, each columnar bag 2 is expanded, enough space is provided for blood circulation by the interval between the expanded columnar bags 2, discomfort of a patient is avoided, the columnar bags 2 can provide a larger supporting height, the blood leading port is supported to a position far away from the wall of a blood vessel by at least two columnar bags 2, and unsmooth blood leading at the blood leading port caused by too low supporting height when the spherical bags are used is avoided; preferably, the number of the cylindrical pockets 2 is 3 to 5, and the respective cylindrical pockets are uniformly spaced along the circumference of the tube body 1.

Therefore, this embodiment sets up the utricule into the column of interval arrangement, has improved the support height of utricule to body 1 under the certain circumstances of cross-sectional area at assurance sacculus position, has both solved the technical problem who draws the blood mouth adherent and has solved the sacculus and has occupied blood flow area in the blood vessel on the large side again, arouses the uncomfortable technical problem of patient.

Wherein, the arrangement mode of the third channel 15 in the tube body 1 and the realization mode of the communication between the inner cavity of each columnar bag 2 and the third channel 15 have various modes, if a first inner pipe with the diameter smaller than the inner diameter of the pipe body 1 is arranged in the pipe body 1, a first connecting layer parallel to the axis of the pipe wall 1 is arranged between the outer wall of the first inner pipe and the inner wall of the pipe body 1, the inner pipe is characterized in that a second inner pipe with the diameter smaller than the inner diameter of the first inner pipe is coaxially arranged in the first inner pipe, a second connecting layer parallel to the axis of the pipe wall 1 is arranged between the outer wall of the second inner pipe and the inner wall of the first inner pipe, a pipe cavity of the second inner pipe is a second channel 14, a cavity enclosed between the outer wall of the second inner pipe and the inner wall of the first inner pipe is a first channel 13, a cavity enclosed between the outer wall of the first inner pipe and the inner wall of the pipe body 1 is a third channel, and through holes communicated with the inner cavity of the columnar bag are formed in the positions, corresponding to the columnar bags, of the side wall of the pipe body 1.

In this embodiment, the pipe body 1 is coaxially provided with the annular flange 22, the annular flange 22 is internally provided with the annular cavity 221, and the annular cavity 221 is communicated with the third channel 15; each cylindrical bag 2 is fixedly connected to the annular flange 22, and the annular chamber 221 is communicated with the inner chamber of each cylindrical bag 2.

Specifically, as shown in fig. 2 and 3, the blood introducing port 11 is located on the side wall of the tube body 1, and the blood returning port 12 is located in the middle of the front end wall of the tube body 1; a circular tube 3 is coaxially arranged in the tube body 1, and the inner cavity of the circular tube 3 is a second channel 14; a first interlayer 4 and a second interlayer 5 which are parallel to the axis of the pipe body 1 are arranged between the inner wall of the pipe body 1 and the outer wall of the circular pipe 3, the annular region between the inner wall of the pipe body 1 and the outer wall of the circular pipe 3 is divided into a first cavity with a larger sectional area and a second cavity with a smaller sectional area by the first interlayer 4 and the second interlayer 5, the sectional area of the first cavity is the same as that of the inner cavity of the circular pipe 3, the first cavity is a first channel 13, and the second cavity is a third channel 15; the side surface of the third channel 15 is provided with a through hole 151, and the through hole 151 communicates the third channel 15 with the annular cavity 221.

It should be noted that, although the annular flange 22 increases the local sectional area of the pipe body 1, the annular flange 22 only functions as a liquid inlet communicating with each cylindrical bag, so that the projection height of the annular flange 2 is low, and the width of the annular flange 22 can be increased in the axial direction of the pipe body 1 to increase the sectional area of the annular cavity 221, so that the annular flange 22 has little influence on the sectional area of the pipe body 1.

In order to ensure that each columnar bag 2 can support the blood leading port to a position far away from the blood vessel wall, the distance between each columnar bag and the blood leading port needs to be kept within a certain range, and when the distance between each columnar bag 2 and the blood leading port 1 is too far, the position of the blood leading port 11 can swing relative to the columnar bag 2, so that the blood leading port 11 cannot be supported to a position far away from the blood vessel wall; when the columnar bag 2 is too close to the blood leading port 1, the columnar bag 11 affects blood flow near the blood leading port 11, and is not beneficial to blood leading from the blood leading port 11, and the inventor finds that when the distance between the edge of each columnar bag 2 and the edge of the blood leading port 11 is set to be more than or equal to 0.5cm and less than or equal to 3cm, the columnar bag can be ensured to support the blood leading port 11 to a position away from the blood vessel wall by a certain distance, and the columnar bag does not affect blood flow near the blood leading port.

In this embodiment, the arrangement of the columnar bags 2 is various, as long as the gaps between the columnar bags 2 can provide a sufficient flow area for blood flow, and the blood leading port 11 can be supported to the middle position, preferably, the columnar bags 2 are cylindrical with a length-diameter ratio greater than 1, the length of each columnar bag 2 is set to be different from the radius of the inner wall of the blood vessel and the radius of the tube body 1, the columnar bags 2 are uniformly distributed on the circumference of the tube body 1, and when the columnar bags 2 are filled with fluid, one end of each columnar bag 2, which is far away from the tube body 1, uniformly leans against the inner wall of the blood vessel, so that the blood leading port 11 is located far away from the wall of the blood vessel.

The fluid injected into the columnar balloon 2 may be air or saline, and is preferably saline for safety.

In this embodiment, when the columnar bag 2 abuts against the inner wall of the blood vessel, a certain pressure is generated on the inner wall of the blood vessel, and in order to reduce the pressure of the columnar bag 2 on the inner wall of the blood vessel, as shown in fig. 1 and 2, one end of each columnar bag 2, which is far away from the tube body 1, is provided with a supporting leg 21 extending outward in the radial direction of the columnar bag 2, and one end of the supporting leg 21, which is close to the inner wall of the blood vessel, is provided with an arc surface matched with the inner wall of the blood vessel.

In this embodiment, the rear end of the tube body 1 is provided with the blood leading tube 6, the blood returning tube 7 and the liquid injection tube 8, the front end of the blood leading tube 6 is connected with the first channel 13, the rear end of the blood leading tube 6 is connected with the dialyzer, the front end of the blood returning tube 7 is connected with the second channel 14, the rear end of the blood returning tube 7 is connected with the dialyzer, the liquid injection tube 8 is connected with the third channel 15, the sealing valve 81 is arranged on the one-way valve on the liquid injection tube 8, the one-way valve can ensure that water in the water bag does not flow backwards after the water is filled into each columnar bag 2, wherein the end of the liquid injection tube 8 is provided with the plug 82, the plug 82 prevents dust and the like from entering, and keeps the liquid injection tube clean.

The working process of the utility model is as follows: after the catheter is placed, the blood return tube 7 and the blood leading tube 6 are connected to a dialyzer, then fluid with specified volume is injected into the third channel 15 to expand each cylindrical sac 2 and prop the blood leading port 11 to the middle part of the blood vessel, and before the hemodialysis catheter needs to be pulled out, the physiological saline in the cylindrical sac 2 is sucked out.

To sum up, the embodiment of the present invention provides a hemodialysis catheter, which comprises a tube body 1, wherein a blood leading port 11 and a blood returning port 12 are arranged at the front end of the tube body 1, a first channel 13 communicated with the blood leading port 11 and a second channel 14 communicated with the blood returning port 12 are arranged in the tube body 1, at least 3 columnar bags 2 are further arranged near the blood leading port 11, each columnar bag 2 is arranged around the circumference of the tube body 1 at intervals, gaps between the columnar bags 2 can provide enough space for blood circulation, a third channel 15 is arranged in the tube body 1, a sealing valve 81 is arranged at the rear end of the third channel 15, the front end of the third channel is communicated with the inner cavity of each columnar bag 2, after the catheter is placed, fluid is injected into the third channel 15, the sealing valve 81 is closed, and gaps among the expanded cylindrical capsules 2 can provide enough space for blood circulation, so that discomfort of a patient caused by the fact that the capsule body occupies an overlarge cross section in a blood vessel is avoided; and the column bag can provide bigger support height, and two at least column bags will draw the blood mouth to support to keeping away from vascular wall department, have avoided current utricule support height to hang down the blood mouth that draws that leads to and draw blood unsmooth.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A hemodialysis catheter comprises a catheter body (1), wherein a blood leading port (11) and a blood returning port (12) are arranged at the front end of the catheter body (1), a first channel (13) communicated with the blood leading port (11) and a second channel (14) communicated with the blood returning port (12) are arranged in the catheter body (1), and the hemodialysis catheter is characterized in that at least 3 columnar bags (2) are further arranged near the blood leading port (11), and the columnar bags (2) are arranged around the circumference of the catheter body (1) at intervals;

a third channel (15) is further arranged in the tube body (1), a sealing valve (81) is arranged at the rear end of the third channel (15), and the front end of the third channel (15) is communicated with the inner cavity of each cylindrical capsule (2).

2. Hemodialysis catheter according to claim 1, wherein an annular flange (22) is coaxially provided on the tube body (1), an annular cavity (221) is provided in the annular flange (22), the annular cavity (221) communicates with the third channel (15);

each columnar bag (2) is fixedly connected to the annular flange (22), and the annular cavity (221) is communicated with the inner cavity of each columnar bag (2).

3. Hemodialysis catheter according to claim 2, characterized in that the blood introduction port (11) is located on the side wall of the tube (1) and the blood return port (12) is located in the middle of the front end wall of the tube (1);

a round pipe (3) is coaxially arranged in the pipe body (1), and the inner cavity of the round pipe (3) is the second channel (14);

a first interlayer (4) and a second interlayer (5) which are parallel to the axis of the pipe body (1) are arranged between the inner wall of the pipe body (1) and the outer wall of the circular pipe (3), the annular region between the inner wall of the pipe body (1) and the outer wall of the circular pipe (3) is divided into a first cavity and a second cavity by the first interlayer (4) and the second interlayer (5), the sectional area of the first cavity is the same as that of the inner cavity of the circular pipe (3), the first cavity is the first channel (13), and the second cavity is the third channel (15);

the side surface of the third channel (15) is provided with a through hole (151), and the third channel (15) is communicated with the annular cavity (221) through the through hole (151).

4. The hemodialysis catheter according to claim 1, wherein a distance between an edge of each of the cylindrical balloons (2) and an edge of the blood introducing port (11) is 0.5cm or more and 3cm or less.

5. Hemodialysis catheter according to claim 1, wherein the cylindrical balloons (2) are cylindrical with a length to diameter ratio greater than 1, the length of each cylindrical balloon (2) being equal to the difference between the inner diameter of the blood vessel and the outer diameter of the tubular body (1).

6. The hemodialysis catheter according to claim 1, wherein one end of each cylindrical bag (2) far away from the catheter body (1) is provided with a supporting leg (21) extending outwards along the radial direction of the cylindrical bag (2), and one end of the supporting leg (21) close to the inner wall of the blood vessel is provided with an arc surface matched with the inner wall of the blood vessel.

7. The hemodialysis catheter according to claim 1, wherein a blood introducing tube (6), a blood returning tube (7) and a liquid injection tube (8) are provided at the rear end of the catheter body (1), the front end of the blood introducing tube (6) is connected with the first passage (13), the rear end of the blood introducing tube (6) is connected with a dialyzer, the front end of the blood returning tube (7) is connected with the second passage (14), and the rear end of the blood returning tube (7) is connected with the dialyzer;

the liquid injection pipe (8) is connected with the third channel (15), the sealing valve (81) is a one-way valve, and the one-way valve is arranged on the liquid injection pipe (8).

8. Hemodialysis catheter according to claim 7, wherein the end of the infusion tube (8) is provided with a plug (82).