JP2012245026A - Catheter for dialysis - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a catheter for dialysis in which the recirculation rates upon forward connection and reverse connection are equally low in a distal end equal position type and patency is high.SOLUTION: The catheter 1 for dialysis includes a tubular body 11, a partition wall 13 for partitioning the inner side, inclination parts 15a and 15b, and a pair of sidewall parts 21. The partition wall 13 is interposed to define a plurality of lumens 16a and 16b opened at equal positions in the direction of a catheter long axis 14 at a catheter distal end 12. The inclination parts 15a and 15b are strip-like objects disposed to be extended from the tubular body 11 and inclined with respect to the direction of the catheter long axis 14. The distal end parts of the inclination parts 15a and 15b are fixed to the partition wall 13 near the catheter distal end. The pair of sidewall part 21 are arranged oppositely on both sides of the width direction, holding the inclination parts 15a and 15b therebetween. The distal end part structure of the catheter 1 has a symmetrical shape with the partition wall 13 as a reference.

Description

  The present invention relates to a dialysis catheter having a plurality of lumens.

  2. Description of the Related Art Medical catheters are conventionally used in applications such as simultaneous extraction of fluid from a body cavity and introduction of fluid into the body cavity in the medical field such as surgery, treatment, and diagnosis. As a specific example, in the field of hemodialysis, there is an application in which blood is extracted from a blood vessel for dialysis treatment with an artificial kidney device, and purified blood is reintroduced into the blood vessel. Some dialysis catheters used in such applications include two lumens formed by partitioning the inside of a tubular body with a partition wall. In this dialysis catheter, blood is drawn through the blood removal side lumen having the blood removal opening at the tip, and at the same time, the purified blood is removed through the blood supply side lumen having the blood feed opening at the tip. It is introduced into the blood vessel.

  By the way, in general, any dialysis catheter has a blood removal opening and a blood delivery opening in the vicinity of the distal end of the catheter. In this application, for the sake of convenience, it is classified into a tip isotope type and a tip step type by the difference in the formation positions thereof. In the case of a distal isotope type dialysis catheter, a blood removal opening and a blood delivery opening are formed at equal positions on the catheter long axis (see, for example, Patent Document 1). Therefore, in this type, it can be set as the catheter tip part structure symmetrical when it sees from the catheter long axis direction. On the other hand, in the case of a tip-stage type dialysis catheter, a blood delivery opening is formed on the distal side on the long axis of the catheter, and a blood removal opening is formed on the more proximal side than that. (For example, refer to Patent Document 2). That is, in this type, since the opening for blood removal and the opening for blood feeding are in an alternate positional relationship, an asymmetric catheter tip portion structure is obtained when viewed from the catheter major axis direction. Therefore, in the distal-stage dialysis catheter, the blood recirculation rate at the time of reverse connection is lower than that of the distal isotope, and a relatively high blood removal efficiency can be realized. In other words, the ratio of the purified blood leaving the blood supply side lumen to return to the blood removal side lumen is reduced, and the efficiency of hemodialysis treatment is improved.

Special table 2007-524442 Japanese Patent Laid-Open No. 2001-104486

  By the way, if the blood stays in the lumen when the dialysis catheter is not dialyzed, the blood tends to coagulate and the catheter may be blocked. Therefore, in order to inhibit blood coagulation, the blood in the catheter is generally replaced with heparinized physiological saline (so-called heparin lock). However, when left in place for a long period of time after replacement, heparinized physiological saline leaks out of the lumen due to blood flow and replaces it with blood, and there is a high possibility that blood will clot in the lumen. End up. Therefore, there has been a demand for a dialysis catheter that is difficult to coagulate blood and has a high patency.

  It is also known that when a dialysis catheter is placed in a blood vessel and used for a certain period of time, the dialysis efficiency gradually decreases. Therefore, in this case, a so-called reverse connection is implemented in which the lumen that has been on the blood removal side is used as the blood supply side, and the lumen that was on the blood supply side is used as the blood removal side and connected to the dialysis circuit. In view of the fact that such reverse connection is possible, it can be said that the distal isotope dialysis catheter having a symmetrical shape is structurally advantageous. However, the tip isotope type dialysis catheter tends to have a high recirculation rate during reverse connection, and there is still room for improvement. Furthermore, since the blood removal efficiency of the isotope type dialysis catheter is lower than that of the distal stage type, it has been desired to increase the blood removal efficiency as much as possible.

  The present invention has been made in view of the above problems, and an object thereof is to provide a dialysis catheter having a high patency and a recirculation rate at the time of forward connection and reverse connection in the tip isotope type being equally low. There is.

  Means 1 to 5 for solving the above problems are listed below.

  [1] For dialysis, comprising a tubular body and a partition partitioning the inside of the tubular body, and a plurality of lumens opening at the same position in the catheter major axis direction in the catheter distal end region are partitioned by the partition. A catheter, which is a strip extending from the tubular main body and inclined with respect to the longitudinal direction of the catheter, and an inclined portion whose tip is fixed to the partition wall near the distal end of the catheter; A dialysis catheter comprising a pair of side wall portions opposed to each other in the width direction across the inclined portion, wherein the structure of the catheter tip region is symmetrical with respect to the septum.

  Therefore, according to the invention described in the means 1, the blood flow is straightened by arranging the pair of side wall portions on both sides of the inclined portion near the distal end of the catheter. Therefore, it becomes difficult for the blood after purification coming out from the blood supply opening to be drawn directly from the blood removal opening. Therefore, the blood recirculation rate becomes low regardless of the forward connection and the reverse connection, and in both cases, a relatively high blood removal efficiency can be realized. In addition, as a result of disposing an inclined portion made of a band-like material in the vicinity of the distal end of the catheter, blood when the blood in the lumen is replaced with a blood coagulation inhibitor when the catheter is not used without significantly impeding the flow of blood when the catheter is used Leakage of the coagulation inhibitor is suppressed. Therefore, blood is less likely to coagulate, and a dialysis catheter with high patency can be obtained.

  [2] The dialysis catheter according to means 1, wherein a gap is provided between the inclined portion and the partition wall on the inner surface side.

  Therefore, according to the invention described in the means 2, by providing a space between the inner surface of the inclined portion and the partition wall, the blood that has reached the space flows along the inner surface of the inclined portion. It can make it harder to block the flow of blood.

  [3] The dialysis catheter according to means 1 or 2, wherein the length of the inclined portion is set to be equal to or longer than the diameter of the tubular body.

  Therefore, according to the invention described in the means 3, since the length of the inclined portion is set to be relatively long, the opening has a long shape along the catheter long axis direction. A cross-sectional area can be secured. In addition, since the inclination angle of the inclined portion with respect to the longitudinal direction of the catheter is reduced, it is possible to further prevent the blood flow when using the catheter.

  [4] The dialysis device according to any one of the means 1 to 3, wherein the pair of side wall portions are curved toward the inclined portion, and the tip is rounded. catheter.

  Therefore, according to the invention described in the means 4, by forming the pair of side wall portions so as to bend toward the inclined portion side, the blood is not spread in the radial direction but is collected in the central direction with the partition wall, The flow is arranged in a straight line efficiently. In addition, since the pair of side walls are formed so that the tips are rounded, the blood flow is less likely to be disturbed, and in the procedure of inserting the catheter directly into the blood vessel, the resistance during catheter insertion can be reduced. .

  [5] The means according to any one of means 1 to 4, wherein the inclined portion on the blood removal side can be bent so as to have a concave curved state on the catheter distal end side. Dialysis catheter.

  Therefore, according to the invention described in the means 5, the flow passage cross-sectional area of the opening is slightly increased because the inclined portion on the blood removal side is bent so as to be concavely curved toward the distal end side of the catheter. Therefore, it becomes easy to achieve improvement in blood removal efficiency.

  Therefore, according to the first to fifth aspects of the present invention, it is possible to provide a dialysis catheter having a high patency with an equally low recirculation rate during forward connection and reverse connection in the distal isotope type.

1 is an overall schematic diagram showing a dialysis catheter of a first embodiment embodying the present invention. The figure when the catheter front-end | tip area | region of the dialysis catheter of 1st Embodiment is seen from the catheter long-axis direction. The schematic sectional drawing in the AA of FIG. The perspective view which shows the catheter front-end | tip area | region of 1st Embodiment. Sectional drawing which shows the mode of the catheter front-end | tip area | region at the time of a forward connection. Sectional drawing which shows the mode of the catheter front-end | tip area | region at the time of reverse connection. The schematic sectional drawing which shows the catheter front-end | tip area | region of 2nd Embodiment which actualized this invention. The schematic sectional drawing which shows the dialysis catheter tip side part of 3rd Embodiment which actualized this invention. In the dialysis catheter of the fourth embodiment that embodies the present invention, (a) is a view when the distal end region of the catheter is viewed from the longitudinal direction of the catheter, and (b) is a schematic cross section taken along line BB of (a). Figure. The figure when the catheter front-end | tip area | region of the dialysis catheter of 5th Embodiment which actualized this invention is seen from a catheter major axis direction.

[First Embodiment]

  Hereinafter, the dialysis catheter 1 of the first embodiment embodying the present invention will be described in detail with reference to FIGS.

  As shown in FIG. 1 and the like, the dialysis catheter 1 of the present embodiment includes a tubular main body 11 having a circular cross section made of an elastic flexible resin material that is elongated. A connecting portion 5 including two connecting tubes 6a and 6b is integrally coupled to a proximal end portion of the tubular main body 11. These connection tubes 6 a and 6 b are communicated with each lumen of the tubular body 11. Luer adapters 7a and 7b to which a dialysis circuit or the like is connected are integrally formed at the distal ends of the connection tubes 6a and 6b. The connection tubes 6a and 6b and the luer adapters 7a and 7b may be configured separately and fixed to each other by bonding or the like. Screw threads 8 are formed on the outer peripheral surfaces of the openings of the connection tubes 6a and 6b. A clamp 9 for closing the flow path is provided in the middle of each connection tube 6a, 6b. In a catheter for long-term indwelling purposes, a synthetic fiber cuff 4 is preferably provided in the vicinity of the proximal end portion of the tubular body 11 for the purpose of preventing bacteria from entering.

  As shown in FIGS. 1 to 4, the tubular main body 11 constituting the dialysis catheter 1 includes a partition wall 13 extending along the direction of the catheter long axis 14. By interposing the partition wall 13, the inside of the tubular main body 11 is partitioned into two regions, so that the blood removal side lumen 16 a and the blood feeding side lumen 16 b each having a semicircular cross section are partitioned. In this embodiment, at the time of forward connection, the one located on the upper side in FIGS. 2 and 3 is used as the blood removal side lumen 16a, and the one located on the lower side is used as the blood sending side lumen 16b. The blood removal side lumen 16a and the blood supply side lumen 16b have openings 17a and 17b in the vicinity of the distal end of the catheter, respectively. These openings 17a and 17b are opened in the catheter tip region 12 at the same position in the direction of the catheter long axis 14. Therefore, the dialysis catheter 1 has a structure called a tip isotope type in the present application. In the present embodiment, the distal end structure of the catheter 1 has a symmetrical shape with respect to the partition wall 13.

  As shown in FIGS. 2 to 4, an inclined portion 15 a is disposed in the opening 17 a of the blood removal side lumen 16 a so as to block a part thereof. On the other hand, an inclined portion 15b is also disposed in the opening 17b of the blood supply side lumen 16b so as to close a part thereof. The inclined portions 15 a and 15 b are strips extending from the tubular main body 11, and are inclined with respect to the direction of the catheter long axis 14. The distal ends of the inclined portions 15a and 15b are fixed to the partition wall 13 at the distal end of the catheter. A gap 18 is provided between the inclined portions 15a and 15b and the partition wall 13 on the inner surface side.

  The length L1 of the inclined portions 15a and 15b is not particularly limited, but is preferably a length equal to or greater than the diameter D1 of the tubular main body 11, and is set as such in the present embodiment. According to such a dimension setting, since the length L1 of the inclined portions 15a and 15b is relatively long, the openings 17a and 17b are substantially long along the direction of the catheter long axis 14. Therefore, a somewhat large channel cross-sectional area can be secured for these openings 17a and 17b. In addition, since the inclination angle of the inclined portions 15a and 15b with respect to the direction of the catheter long axis 14 is small, it is difficult to obstruct blood flow when using the catheter.

  In addition, the inclination angle of the inclined portions 15a and 15b with respect to the direction of the catheter major axis 14 is not particularly limited, but is preferably, for example, 15 ° to 45 °, and more preferably 30 ° to 45 °. Good. If the inclination angle is less than 15 °, the inclined portions 15a and 15b become too long, and the structure of the catheter tip region 12 may be weakened in strength. Conversely, if the inclination angle exceeds 45 °, not only is it difficult to increase the flow path cross-sectional area of the openings 17a and 17b, but also the resistance when blood flows increases to improve blood removal efficiency. May interfere.

  As shown in FIGS. 2 to 4, the dialysis catheter 1 includes a pair of side wall portions 21 in the catheter distal end region 12. The pair of side wall portions 21 are disposed opposite to each other in the width direction with the inclined portions 15a and 15b interposed therebetween. These side wall portions 21 are formed to bend toward the inclined portions 15a and 15b. As a result, blood does not spread in the radial direction but is collected in the central direction of the partition wall 13 so that the blood flow is efficiently arranged in a straight line. Moreover, these side wall parts 21 have the chamfered part 22 in which the front-end | tip was rounded. As a result, the blood flow is not easily disturbed. Further, in a procedure for directly inserting a catheter into a blood vessel (that is, a procedure that does not use an introducer sheath, which will be described later), the resistance at the time of catheter insertion is easily reduced.

  The structure of the catheter tip region 12 in the dialysis catheter 1 of the present embodiment can be produced, for example, by the following method. First, a double-lumen tubular main body 11 whose center is partitioned by a partition wall 13 is prepared. Next, incisions 19 extending in the direction of the catheter major axis 14 are formed in parallel at two places on the upper and lower sides of the tubular body 11 on the side that becomes the distal end of the catheter. And the front-end | tip part of the strip | belt-shaped part between these cut | interruptions 19 is dropped in the partition 13 side, and is fixed to the partition 13. FIG. As a result, desired inclined portions 15a and 15b are formed, and at the same time, a pair of side wall portions 21 are formed on both sides of the inclined portions 15a and 15b. The tip portions of the inclined portions 15a and 15b are fixed by, for example, welding or adhesion. In the present embodiment, the tip portions of the inclined portions 15a and 15b are flush with the catheter tip.

  Next, a method for using the dialysis catheter 1 of the present embodiment will be described. First, a subcutaneous tunnel is prepared according to a conventional method, an introducer sheath (not shown) is inserted into the blood vessel, and then the dialysis catheter 1 is inserted along the lumen. At that time, the two lumens 16a and 16b in the dialysis catheter 1 are filled with heparinized physiological saline. After confirming that the dialysis catheter 1 has been placed at the target position, the introducer sheath is removed. Then, after the air in the lumen 16b on the blood sending side is removed by a conventional method, the air is flushed with physiological saline or heparinized physiological saline. The same operation is performed on the blood removal side lumen 16a.

  Then, the proximal end side of the dialysis catheter 1 is securely connected to the extracorporeal circuit (that is, the dialysis circuit), and extracorporeal circulation is started. In the forward connection shown in FIG. 5, specifically, the luer adapter 7a of the connection tube 6a is connected to the blood removal side port of the dialysis circuit, and the lure adapter 7b of the connection tube 6b is connected to the blood supply side port of the dialysis circuit. . In such a connected state, each clamp 9 is unlocked, and the blockage of the flow path is released. Then, the blood in the vein is extracted through the blood removal side lumen 16a having the opening 17a for blood removal at the tip. At the same time, purified blood, that is, blood from which impurities and the like have been removed, is introduced into the blood vessel through the blood supply lumen 16b having a blood supply opening 17b at the tip. In this case, as shown in FIG. 5, the inclined portion 15 a located in the blood removal side lumen 16 a is bent so as to be concavely curved toward the distal end side of the catheter by being pressed by the inflowing blood flow. . As a result, the channel cross-sectional area of the opening 17a is slightly increased, the resistance when blood flows is reduced, and it is easy to achieve improvement in blood removal efficiency. In addition, the inclined portion 15b located in the lumen 16b on the blood supply side is bent so as to be convexly curved toward the distal end side of the catheter by being pressed by the flowing blood flow.

  In the portion where the opening 17b on the blood supply side is present, the pair of side wall portions 21 are arranged opposite to each other on both sides of the inclined portion 15b, so that the flow is straightened when blood is discharged from the opening 17b. It is done. Therefore, the purified blood that exits from the blood supply opening 17b is less likely to be drawn directly from the blood removal opening 17a.

  When the extracorporeal circulation is completed, the lumen 16a on the blood removal side is flushed with physiological saline or heparinized physiological saline, and then heparin-locked. The same operation is performed on the lumen 16b on the blood supply side. Here, if the dialysis catheter 1 is left in place for a long time with the heparin locked, heparinized physiological saline may leak from the lumens 16a and 16b and be replaced with blood due to blood flow. There is. In this respect, in the present embodiment, inclined portions 15a and 15b are disposed in the openings 17a and 17b of the lumens 16a and 16b, respectively. Therefore, for the heparinized physiological saline that is about to flow out of the catheter 1, these inclined portions 15a and 15b become obstacles on the flow path. Therefore, leakage of heparinized physiological saline can be suppressed.

  When the extracorporeal circulation from the next time is performed on the dialysis catheter 1 that has been in a non-use state, the lumens 16a and 16b are previously flushed with physiological saline or heparinized physiological saline. Next, it is confirmed that a sufficient blood flow rate can be secured. When a sufficient blood flow rate cannot be secured and there is a concern about a decrease in dialysis efficiency, the indwelling position of the catheter tip is moved and an appropriate position is selected. Alternatively, the dialysis catheter 1 is reversely connected to the extracorporeal circuit to perform extracorporeal circulation. That is, as shown in FIG. 6, the lumen 16a that has been the blood removal side so far is used as the blood supply side, and the lumen 16b that has been the blood supply side is used as the blood removal side.

  This time, the blood in the vein is extracted through the lumen 16b having the opening 17b at the tip. At the same time, purified blood is introduced into the blood vessel through the lumen 16a having the opening 17a at the tip. In this case, as shown in FIG. 6, at this time, the inclined portion 15b located on the lumen 16b on the blood removal side is pressed by the inflowing blood flow so as to have a concave curved state on the distal end side of the catheter. Bend. As a result, the channel cross-sectional area of the opening 17b is slightly increased, the resistance when blood flows is decreased, and it is easy to achieve improvement in blood removal efficiency. Further, at this time, the inclined portion 15a located on the lumen 16a on the blood feeding side is bent so as to be in a convex curved state toward the distal end side of the catheter by being pressed by the flowing blood.

  At this time, in a portion where the opening 17a on the blood feeding side is present, the pair of side wall portions 21 are arranged opposite to each other on both sides of the inclined portion 15a, so that the flow is straight when blood is discharged from the opening 17a. It is arranged into a shape. Therefore, it is difficult for the purified blood that comes out of the opening 17a to be directly drawn from the opening 17b.

  As described above, according to this embodiment, the following operational effects can be obtained.

  (1) In the dialysis catheter 1 of the present embodiment, the blood flow is straightened by arranging the pair of side wall portions 21 on both sides of the inclined portions 15a and 15b as described above. Therefore, at the time of forward connection, the purified blood that comes out from the blood-feeding opening 17a is less likely to be drawn as it is from the blood removal-use opening 17b. Further, at the time of reverse connection, it becomes difficult for the purified blood coming out from the opening 17b for blood supply to be directly drawn from the opening 17a for blood removal. Therefore, the blood recirculation rate becomes low regardless of the forward connection and the reverse connection, and in both cases, a relatively high blood removal efficiency can be realized. In addition, as a result of arranging the inclined portions 15a and 15b made of strips in the vicinity of the distal end of the catheter, the blood in the lumens 16a and 16b is heparinized and physiologically not used when the catheter is not used. Leakage of heparinized physiological saline when it is replaced with saline can be suppressed. Therefore, blood becomes difficult to coagulate, and thrombus formation can be prevented in advance. As described above, according to the present embodiment, it is possible to provide the dialysis catheter 1 having the same recirculation rate at the time of forward connection and reverse connection in the distal isotope type and high patency.

  (2) In the dialysis catheter 1 of the present embodiment, the gap 18 is provided between the inclined portions 15a and 15b and the partition wall 13 on the inner surface side. Therefore, as a result of the blood that has reached the gap 18 flowing along the inner surfaces of the inclined portions 15a and 15b, it is possible to make it difficult for the blood flow to be obstructed when the catheter is used.

  (3) In the dialysis catheter 1 of the present embodiment, the length L1 of the inclined portions 15a and 15b is set to be equal to or longer than the diameter D1 of the tubular body 11, so that the length L1 is relatively long. Can take. For this reason, the openings 17a and 17b have a long shape along the direction of the catheter long axis 14, and a somewhat large channel cross-sectional area can be secured for the openings 17a and 17b. Therefore, even with this structure, leakage of heparinized physiological saline can be reliably suppressed, and patency can be improved by suppressing blood coagulation. In addition, since the inclination angle of the inclined portions 15a and 15b with respect to the direction of the catheter long axis 14 becomes small, it is possible to make it difficult to obstruct blood flow when using the catheter.

  (4) In the dialysis catheter 1 of the present embodiment, the pair of side wall portions 21 are formed to bend toward the inclined portions 15a and 15b, and the chamfered portion 22 is formed so that the tip is rounded. For this reason, blood does not spread in the radial direction but is collected in the central direction where the partition wall 13 is located, and the blood flow is efficiently arranged in a straight line. In addition, the blood flow is less likely to be disturbed, and the resistance at the time of catheter insertion can be reduced in the procedure of inserting the catheter directly into the blood vessel.

  (5) In the dialysis catheter 1 of the present embodiment, the inclined portions 15a and 15b on the blood removal side at that time can be bent so as to have a concave curved state on the catheter tip side. For this reason, the flow passage cross-sectional area of the openings 17a and 17b on the blood removal side at that time is slightly increased, and it is easy to achieve improvement in blood removal efficiency.

[Second Embodiment]

  Next, a dialysis catheter 31 according to a second embodiment embodying the present invention will be described with reference to FIG. Here, the parts different from the first embodiment will be described, and the common parts will only be given the common member numbers.

  As shown in FIG. 7, in the dialysis catheter 31, a protruding portion 32 that protrudes from the distal end of the catheter is provided at the distal end of the partition wall 13. Therefore, according to this configuration, the same effects as those of the first embodiment can be obtained. In particular, since the blood flow is more efficiently arranged in a straight line, the recirculation rate at the time of reverse connection can be reliably reduced. Therefore, the dialysis catheter 31 with high patency can be provided.

[Third Embodiment]

  Next, a dialysis catheter 41 according to a third embodiment embodying the present invention will be described with reference to FIG. Here, the parts different from those of the first embodiment will be described, and common parts are only given common member numbers.

  As shown in FIG. 8, in this dialysis catheter 41, the distal end of the catheter and the distal end of the partition wall 13 are flush with each other, but the distal ends of the inclined portions 15a and 15b are not flush with these, but are slightly proximal. It differs in that it is located on the side. Even with such a configuration, an effect equivalent to that of the first embodiment can be obtained.

[Fourth Embodiment]

  Next, a dialysis catheter 51 according to a fourth embodiment embodying the present invention will be described with reference to FIG. Here, the parts different from those of the first embodiment will be described, and common parts are only given common member numbers.

  As shown in FIG. 9, the dialysis catheter 51 is different from the first embodiment in that it has a triple lumen structure in which three lumens 16a, 16b, and 16c are partitioned by a partition wall 13. is doing. The newly formed lumen 16 c has a circular cross section and is located at the center of the tubular body 11. The inclined portions 15a and 15b are provided for the other two lumens 16a and 16b, but are not particularly provided for the lumen 16c. Also, in this dialysis catheter 51, the structure of the catheter tip region 12 is symmetrical with respect to the partition wall 13, so that reverse connection can be performed as necessary. And even if it is such a structure, there can exist an effect equivalent to the said 1st Embodiment fundamentally.

[Fifth Embodiment]

  Next, a dialysis catheter 61 according to a fifth embodiment embodying the present invention will be described with reference to FIG. Here, the parts different from those of the first embodiment will be described, and common parts are only given common member numbers.

  As shown in FIG. 10, this dialysis catheter 61 is also different from the first embodiment in that it has a triple lumen structure. The newly formed lumen 16 c is located at the center of the tubular body 11. However, in the present embodiment, two partition walls 13 are provided in parallel in the tubular body 11 at a predetermined interval, and a lumen 16c having a substantially rectangular cross section is formed between them. The inclined portions 15a and 15b are provided for the other two lumens 16a and 16b, but are not particularly provided for the lumen 16c. Also, in this dialysis catheter 61, the structure of the catheter tip region 12 is symmetrical with respect to the partition wall 13, so that reverse connection can be performed as necessary. And even if it is such a structure, there can exist an effect equivalent to the said 1st Embodiment fundamentally.

  In addition, you may change embodiment of this invention as follows.

  In the above embodiment, the pair of side wall portions 21 disposed opposite to the left and right sides of the inclined portions 15a and 15b have the same size and shape, but the present invention is not limited to this. Therefore, if the structure of the catheter tip region 12 can maintain a symmetrical shape with respect to the partition wall 13, it is allowed to vary the size and shape of the side wall portion 21 on the left and right.

  In the above embodiment, the inclined portions 15a and 15b can be bent so as to have a concave or convex curved state toward the distal end side of the catheter due to blood flow. However, the present invention is not limited to this, and no particular bending occurs. It may be a configuration.

  In the embodiment described above, the slit 19 is formed on the side of the tubular body 11 that becomes the catheter tip, and the tip of the belt-like portion between them is dropped and fixed to the partition wall 13 side, so that the inclined portions 15a and 15b are fixed. Formed. That is, although the inclined parts 15a and 15b were formed by processing a part of the tubular main body 11, it is not limited to this. For example, a belt-like object formed separately from the tubular main body 11 may be prepared and fixed by a technique such as welding or adhesion. The same applies to the pair of side wall portions 21, and a structure in which a member formed separately from the tubular main body 11 is fixed by adhesion or the like can be employed.

  The technical ideas grasped from the embodiments of the present invention are listed below.

  (1) In any one of the above means 1 to 5, the inclined portion on the blood removal side can be bent so as to be in a concave curved state on the catheter tip side, The inclined portion to be bent can be bent so as to have a convex curved state toward the distal end side of the catheter.

  (2) In any one of the above means 1 to 5, the pair of inclined portions form a pair of cuts on the side of the tubular body that becomes the catheter tip, and the tips of the belt-like portions between the pair of cuts It is formed by dropping the part into the partition wall and fixing it to the partition wall.

DESCRIPTION OF SYMBOLS 1, 31, 41, 51, 61 ... Dialysis catheter 11 ... Tubular main body 12 ... Catheter tip region 13 ... Septum 14 ... Catheter long axis 15a, 15b ... Inclined part 16a, 16b, 16c ... Lumen 18 ... Air gap 21 ... Side wall part L1: Length of the inclined portion D1: Diameter of the catheter body

Claims (5)

A dialysis catheter comprising a tubular body and a partition partitioning the inside of the tubular body, and a plurality of lumens opening at the same position in the catheter longitudinal axis direction in the catheter tip region by the intervention of the partition wall. And
A band extending from the tubular main body and inclined with respect to the longitudinal direction of the catheter, and an inclined portion of which the distal end is fixed to the partition wall in the vicinity of the distal end of the catheter, and sandwiching the inclined portion And a pair of side wall portions disposed opposite to each other in the width direction, and the structure of the catheter tip region is symmetrical with respect to the septum.   The dialysis catheter according to claim 1, wherein a gap is provided between the inclined portion and the partition wall.   The dialysis catheter according to claim 1 or 2, wherein a length of the inclined portion is set to be equal to or longer than a diameter of the tubular main body.   The dialysis catheter according to any one of claims 1 to 3, wherein the pair of side wall portions are curved toward the inclined portion, and the tip is rounded.   The dialysis device according to any one of claims 1 to 4, wherein the inclined portion on the blood removal side can be bent so as to have a concave curved state on the distal end side of the catheter. catheter.

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