JP6275317B2 - Balloon base and oblique inflatable balloon catheter - Google Patents

Description

  The present invention relates to a balloon base and an obliquely inflatable balloon catheter. More specifically, the present invention is mainly used for a balloon catheter that is placed in a blood vessel. A balloon base capable of preventing the occurrence of wrinkles in a deflated state of the balloon, and an obliquely inflatable balloon catheter equipped with the balloon base. It is concerned.

  Generally, a balloon provided on a balloon catheter is inflated concentrically with respect to the catheter body. Therefore, in the case of a straight blood vessel, since the balloon is positioned at right angles to the blood vessel, the indwelling fixation is good, and the catheter lumen faces the center of the blood vessel with respect to the blood vessel, so that smooth blood feeding or liquid feeding is possible. Become.

  For example, the balloon catheter as described above is used in a mass administration system of an anticancer agent for a liver cancer patient known as percutaneous liver perfusion chemotherapy (PIHP: Percutaneous Isolated Hepatic Perfusion). In this system, an anticancer agent administered in a large amount into the hepatic artery is selectively removed from the hepatic vein together with the blood, adsorbed and removed by an activated carbon column or the like, and then sent to the patient again. Therefore, in the above system, as shown in FIG. 12, the anti-cancer agent is continuously administered into the hepatic artery using the catheter 105 of the anti-cancer agent administration apparatus, while the two balloons 103 of the balloon catheter 101 inserted separately into the blood vessel of the patient. 104, the upper and lower portions near the hepatic vein branch are occluded, and the anticancer drug administered in large quantities from the hepatic artery is taken in along with the hepatic venous blood as indicated by the arrow from the side hole provided at the site occluded by both balloons. Blood is removed from the lumen (not shown), purified through the pump P and blood purifier F outside the body, and returned to the blood feeding lumen (not shown). Then, the blood that has been purified and returned again bypasses the site blocked by the balloons 103 and 104 and is sent to the heart from the distal end opening of the balloon catheter 101.

By the way, in the PIHP therapy, the balloon catheter 101 as described above is used, and in the inferior vena cava following the right atrium of the heart, the heart and three hepatic veins (right hepatic vein opening, middle hepatic vein opening, left liver It is necessary to place a distal end balloon in a short curved blood vessel portion between the venous opening and completely block the blood flow. When a balloon catheter is inserted and placed in a curved blood vessel, as shown in FIG. 13, the central axis of the curved blood vessel lumen and the central axis of the balloon catheter 101 are shifted due to the rigidity of the balloon catheter itself. As shown in the figure, there is a risk that the blood flow directly hits the blood vessel wall to cause damage to the blood vessel wall. Further, depending on the shape of the blood vessel wall, there is a problem that the contact area of the balloon is reduced and the balloon is likely to slip due to the pressure during blood feeding. Furthermore, due to anatomical individual differences such as the shape of the blood vessel, the degree of curvature, and the position of the hepatic vein hole, the balloon cannot adhere to the blood vessel wall, creating a gap, and the anticancer drug administered in large quantities enters the circulating blood and is carried throughout the body. There was also a problem. As described above, when a balloon catheter is inserted and placed in a curved blood vessel and blood circulation is blocked by the balloon, there is a problem of blood vessel wall damage due to blood flow, a problem of balloon slip due to a decrease in the contact area of the balloon, There was a problem of incomplete occlusion (incomplete blockage of blood flow).

  Prior art documents for solving such problems do not exist according to the investigation by the applicant, but as a balloon used for a tracheostomy tube inserted into a tracheal lumen, Japanese Patent No. 5679813 (Patent Document 1). ) Is disclosed.

  This Patent Document 1 relates to a tracheostomy tube device, and according to claim 1 and FIG. 4 and the like, it is an invention having the following balloon. That is, the balloon 175 disclosed herein is an inflatable balloon that surrounds a portion of the hollow tube 155 such that the distal end 165 of the tube is substantially centered on the balloon. A balloon distal end 180 attached to the distal end of the tube, and positioned below the proximal face P of the device, farther away from the patient's head, and substantially centered on the tube bending region 170 Having a balloon proximal end 185 that is attached to the bent region so as to be 8 to 10 mm off the front of the patient from the center of the balloon, and is positioned below the proximal surface of the device when inflated. Inflate around the proximal end 160 of the tube and the distal end of the tube to allow the air below the tracheal fistula to close without closing the tracheal fistula. It has become such a manner as to close the (denoted by the reference numeral reference).

  However, since the balloon 175 is a balloon formed in advance with the above-described configuration with respect to the catheter body, the balloon is wrinkled in a contracted state, and the surface of the catheter body is uneven by the balloon. Occurred and could not adhere to the surface. Therefore, if a catheter with a balloon having wrinkles formed on the surface as described above is inserted into a blood vessel for use in the mass administration system, the inner wall of the blood vessel may be damaged by the wrinkles of the balloon. In addition, like the above-described conventionally known balloons, the problem that the slip easily occurs cannot be solved.

Japanese Patent No. 5679813 (Claim 1, FIG. 4)

  Therefore, the present invention solves the conventional problems as described above, and even in a curved blood vessel, the central axis of the catheter does not deviate from the central axis of the catheter body, and the balloon is inclined so that the balloon is inclined with respect to the body tube. It is an object of the present invention to provide a balloon base and an obliquely inflatable balloon catheter that can be inflated and that the contact area with respect to the blood vessel does not decrease or the balloon does not wrinkle in a contracted state and is difficult to slip.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a balloon base provided by fitting to a front end portion of the catheter body of an obliquely inflatable balloon catheter having a tubular catheter body having a predetermined length. And having a cylindrical base having a diameter larger than the outer diameter of the catheter main body, and a lumen having substantially the same diameter as the outer diameter of the catheter main body is formed over the entire length by opening both ends. The central axis of the lumen is inclined at a predetermined angle with respect to the central axis of the base, and the outer peripheral surface in the axial direction is formed parallel to the central axis of the base.

  According to a second aspect of the present invention, in the first aspect, the predetermined angle is 3 ° to 10 °.

  According to a third aspect of the present invention, in the first or second aspect, the outer peripheral surface is curved so as to gradually become a smaller diameter from the outer peripheral surface of the central portion for balloon attachment parallel to the central axis of the base. It consists of the outer peripheral surface of the both ends.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the balloon base is formed with a communication passage communicating the balloon lumen provided in the peripheral wall of the catheter body and the inside of the balloon.

  According to a fifth aspect of the present invention, in the balloon base according to any one of the first to fourth aspects, a balloon is provided on an outer peripheral surface in the axial direction formed in parallel to the central axis of the base, and the balloon is provided. The balloon base is fitted to the front end of the catheter body so that the center axis of the base is concentric with the center axis of the catheter body, and the balloon is oblique to the center axis of the catheter body when inflated. An obliquely inflatable balloon catheter characterized in that the balloon catheter is inflated.

  According to a sixth aspect of the present invention, in the fifth aspect, the lumen of the catheter body is partitioned into a blood removal lumen for removing blood from the blood vessel and a blood feeding lumen for sending blood to the blood vessel. The opening area of the blood removal lumen is larger than the opening area of the blood feeding lumen.

  The invention according to claim 7 is the invention according to claim 5 or 6, wherein the second balloon is provided in the catheter main body at a predetermined length behind the balloon, and blood is supplied to the catheter main body between the second balloon and the balloon. A side hole is provided for taking into the blood removal lumen.

  This invention is as described above. According to the invention described in claim 1, the oblique inflatable balloon catheter having a tubular catheter body having a predetermined length is fitted to the front end portion of the catheter body. A balloon base provided with a cylindrical base having a diameter larger than the outer diameter of the catheter main body, and a lumen having substantially the same diameter as the outer diameter of the catheter main body opens at both ends thereof; The center axis of this lumen is inclined at a predetermined angle with respect to the center axis of the base, and the outer peripheral surface in the axial direction is formed parallel to the center axis of the base, so that the base is interposed. The balloon attached to the outer peripheral surface of the lever can be inflated so as to be inclined with respect to the catheter body.

  According to the second aspect of the present invention, since the predetermined angle is 3 ° to 10 °, it is possible to effectively cope with a curved blood vessel of a patient having a slight individual difference.

  According to the third aspect of the present invention, the outer peripheral surface includes the outer peripheral surface of the central portion for attaching the balloon parallel to the central axis of the base, and the outer periphery of both end portions curved so as to gradually become smaller in diameter from the outer peripheral surface. Therefore, the balloon can be smoothly attached to the outer peripheral surface of the central portion, and damage to the blood vessel wall can be prevented by the outer peripheral surfaces of the both ends.

  According to the fourth aspect of the present invention, since the balloon base is formed with a communication passage that communicates the balloon lumen provided in the peripheral wall of the catheter body and the inside of the balloon, the balloon is inserted through the base. Even if attached, the balloon can be inflated and contracted through the communication path.

  According to the fifth aspect of the present invention, in the balloon base according to any one of the first to fourth aspects, the balloon is provided on the outer peripheral surface in the axial direction formed in parallel to the center axis of the base. The provided balloon base is fitted to the front end of the catheter body so that the center axis of the foundation is concentric with the center axis of the catheter body, and the balloon is inflated with respect to the center axis of the catheter body when inflated. Therefore, the balloon can be inflated so as to be inclined with respect to the catheter body, and even in a curved blood vessel, the center axis of the balloon does not deviate from the center axis of the catheter body. For this reason, the central axis of the curved blood vessel lumen and the central axis of the catheter shift due to the rigidity of the catheter itself as in the conventional case, and the blood flow directly hits the blood vessel wall to damage the blood vessel wall. There is no waking. At the same time, the contact area of the balloon with respect to the blood vessel does not decrease, and since it is not a shaped balloon, it does not wrinkle even when the balloon is contracted and closely contacts the outer peripheral surface of the base. There is an effect that the balloon can be firmly placed and fixed without slipping due to pressure.

  Furthermore, in use, the central axis of the catheter is rotated according to anatomical individual differences such as the curved shape and the position of the hepatic vein opening in the short blood vessel lumen between the heart and the liver, and the oblique inflation direction of the balloon Can be adjusted, and there is an effect that appropriate indwelling and fixing of the balloon on the distal end side can be realized. On the other hand, in a conventional balloon that cannot be expanded in an oblique direction, the contact position between the balloon and the blood vessel lumen cannot be changed even if the central axis of the catheter is rotated.

  According to the invention described in claim 6, the lumen of the catheter body is partitioned into a blood removal lumen for removing blood from the blood vessel and a blood feeding lumen for sending blood to the blood vessel. Since the opening area of the lumen is larger than the opening area of the blood feeding lumen, blood removal can be performed more quickly, reliably and efficiently.

  According to the seventh aspect of the present invention, the second balloon is provided in the catheter body behind the balloon by a predetermined length, and blood is supplied to the catheter body between the second balloon and the balloon as a blood removal lumen. Since the side hole for taking in is provided, the blood between both balloons can be effectively extracted from the side hole to the blood removal lumen.

FIG. 3 is a front view of the obliquely inflatable balloon catheter according to the embodiment of the present invention, with a part of the length of the catheter body omitted. It is an expanded sectional view of a balloon part same as the above. FIG. 3 is an enlarged sectional view taken along line III-III in FIG. 2. The balloon base is shown, (A) is a front view, (B) is a rear view, (C) is a left side view, and (D) is a right side view. It is an expanded sectional view of the base for balloons same as the above. It is drawing which shows the state which bonded the balloon to the base for balloons, and made the level | step difference of a balloon and a base smooth among the manufacturing processes of a balloon catheter same as the above. It is drawing which shows the state which mount | wears with a main body tube, and adhere | attaches the base for balloons which adhered the balloon among the manufacture processes of a balloon catheter same as the above. It is drawing which shows the completion state (balloon contraction) of a balloon catheter same as the above. It is drawing which shows the completion state (balloon inflation) of a balloon catheter same as the above. It is action explanatory drawing which shows the state which inserted the balloon catheter same as the above into the curved blood vessel. It is an expanded sectional view of the balloon part corresponding to Drawing 2 showing a modification. It is a schematic explanatory drawing which shows an example of the conventionally known mass administration system of the anticancer agent. It is action explanatory drawing which shows the state which inserted the conventional balloon catheter into the curved blood vessel.

  Hereinafter, an obliquely inflated balloon catheter according to an embodiment of the present invention will be described with reference to the drawings.

<Example>
1 to 3, reference numeral 1 denotes a balloon catheter made of a material suitable for a living body such as silicone rubber. The balloon catheter 1 mainly includes a tubular catheter body 2, balloons 3 and 4, and a balloon base 5. Has been.

  A lumen 6 having a substantially circular cross section is provided in the catheter body 2 in the axial direction from the front end to the rear end. The front end of the catheter body 2 is cut away obliquely. The lumen 6 extends in the axial direction and is divided into a blood removal lumen 10 and a blood feeding lumen 11 by an integrally formed partition wall 7. The blood removal lumen 10 is for drawing blood from the blood vessels in the body, and the blood feeding lumen 11 is for sending blood to the blood vessels. In this example, the opening area on the surface orthogonal to the axial direction of the blood removal lumen 10 is slightly larger than that of the blood supply lumen 11. The reason is to perform blood removal more quickly, reliably and efficiently. The ratio of the opening area of the blood removal lumen 10 and the blood delivery lumen 11 is not particularly limited, but the ratio is preferably 6: 4. In this example, the blood removal lumen 10 and the blood feeding lumen 11 are formed by partitioning with the partition wall 7, but a small diameter tube is concentrically arranged in the lumen 6 without partitioning with the partition wall 7. The inside and outside of the tube may be used as either the blood removal lumen 10 or the blood feeding lumen 11.

  As shown in FIG. 3, a lumen 12 for the balloon 3 at the front and a lumen 13 for the balloon 4 at the rear are formed along the axial direction on the wall of the catheter body 2 near both base ends of the partition wall 7, The balloons 3 and 4 communicate with the balloon bases 5 through communication paths described later. The lumens 12 and 13 are inflated or deflated by the balloons 3 and 4 that are infused with physiological saline or the like from a syringe (not shown) and communicated through the communication passages. In FIG. 2, reference numeral 14 denotes a rod-shaped eyelet as a stuffing, which is filled in the front end opening of the blood removal lumen 10 and closes it.

  The balloon base 5 is made of a part manufactured independently of the catheter body 2 and is provided at the front end of the catheter body 2. The balloon base 5 is an eccentric single lumen tube type. That is, the balloon base 5 is a base 15 having a predetermined length which is larger in diameter than the outer diameter of the catheter body 2 and formed in a substantially tube shape, as shown in detail in FIGS. 4 (A) to 4 (D) and FIG. In the base, a lumen 16 having substantially the same diameter as the outer diameter of the catheter body 2 is formed with its front and rear ends opened.

  The lumen 16 of the base 15 has a predetermined angle θ ° with respect to the central axis Y of the base 15 whose central axis X is concentric with the central axis of the catheter main body 2 when the base is provided at the front end of the catheter main body 2. It is provided with the inclination of. The inclination angle is preferably in the range of 3 ° to 10 °, and a particularly preferable angle is 4 ° to 6 °, and a more particularly preferable angle is 5 ° in this example. Note that the angle of inclination is not necessarily limited to an angle in the range of 3 ° to 10 °, and there are individual differences in the degree of bending of blood vessels depending on the patient. It is possible to make an arbitrary angle in the range of about 25 ° to 25 °. Since the lumen 16 is inclined as described above, the front end opening thereof is positioned closer to the upper side of the base 15 and the rear end opening is positioned closer to the lower side of the base 15.

  At the center of the base 15, two water passage holes 17 are provided as communication passages that communicate the balloon lumen 12 provided in the peripheral wall of the catheter body 2 and the inside of the balloon 3.

  The base 15 has a central portion 18 that is an outer peripheral surface parallel to the central axis Y of the base 15 and concentric with the central axis of the catheter body 2 as described above, and a tip that gradually decreases in diameter from the central portion 18. It consists of both ends 19 and 20 which became the outer peripheral surface curved in a narrow shape. And the balloon 3 is provided in the outer peripheral surface of the center part 18 which became parallel. Both end portions 19 and 20 have a large curvature on the thick side and a small curvature on the thin side. As is apparent from FIG. 5, the balloon base 5 is formed in a point-symmetrical shape with the center point P as the center, and the right half and the left half are symmetrical at 180 ° opposite positions. It has become.

  Because of the shape as described above, the balloon base 5 is seen from the left side, as shown in FIG. 4C, with the front end opening of the lumen 16 facing upward and facing the inside of the lumen. As shown in FIG. 4 (D), the rear end opening of the lumen 16 faces downward and looks like it faces the lumen.

  When the dimensions of the constituent parts of the balloon base 5 are described with reference, the total length is 30 mm, the outer diameter is 11.7 mm, the inner diameter of the lumen 16 is 8 mm, the length of the central portion 18 is 17 mm, and the lengths of both ends 19 are The length of both ends 20 is 8.6 mm and 5.0 mm.

  As shown in FIG. 2, a plurality of balloon bases 5 provided with the balloon 3 as described above are provided in the catheter body 2 between the balloon 3 and the balloon 4 provided at the front end of the catheter body 2 in the axial direction as shown in FIG. In this example, three) side holes 22 are provided in communication with the blood removal lumen 10 so that blood between the balloons 3 and 4 can be drawn into the blood removal lumen 10. The distance between the balloon 3 provided with the side hole 22 and the balloon 4 is set to 40 mm to 60 mm, for example. The balloon 3 is a so-called flat balloon that can be adhered flatly without forming irregularities on the outer peripheral surface of the central portion 18 of the balloon base 5 in a contracted state. Therefore, the wrinkles as in the past do not approach.

  Due to the structure of the base 5, the axial outer peripheral surface of the base 15 to which the balloon 3 is attached is inclined at the same angle as the inclination angle of the lumen 16 as is apparent from FIGS. The balloon 3 attached to the front end portion of the catheter body 2 via the base 5 is inflated so that a line perpendicular to the center axis is inclined at a predetermined angle θ with respect to the center axis of the catheter body 2 and is inclined. Inflate. The other balloon 4 attached to the catheter body 2 does not incline while inflated, since the line perpendicular to the central axis remains perpendicular to the central axis of the catheter body 2 so as to inflate diagonally. There is nothing.

  In FIG. 1, reference numerals 23 and 24 denote connectors provided at the rear end of the main body tube 2, the connector 23 communicates with the blood removal lumen 10, and the connector 24 communicates with the blood supply lumen 11. . Connected to the connector 23 and the connector 24 are a circulation tube having a pump P and a blood purifier F constituting a system for mass-administering an anticancer agent as a closed circuit as described above, and sent from the blood removal lumen 10 via the connector 23. Purified blood is purified by a blood purifier F, and the purified blood is further circulated through the connector 24 to the blood feeding lumen 11 so as to be sent. Similarly, 25 and 26 are connection connectors provided at the rear end portion of the main body tube 2, and a syringe (not shown) is connected to these connection connectors 25 and 26, and the balloon 3, through the balloon lumens 12 and 13. Saline can be sent to 4.

  6 to 9 are drawings for explaining the manufacturing method of the present catheter. This will be described in order as follows. That is, first, the balloon 3 is bonded to the individually manufactured balloon base 5 (FIG. 6). Since this bonding operation is performed on the outer peripheral surface of the central portion 18 which is a flat cylindrical surface of the balloon base 5, there is no difficulty and the operation can be performed smoothly. Thereafter, the balloon base 5 to which the balloon 3 is attached is inserted from the front end of the catheter body 2 (FIG. 7), and when the predetermined attachment position is reached, the balloon base 5 is bonded and fixed to the catheter body 2. (FIG. 8). The dotted line in FIG. 7 shows the assumed mounting position of the base 5. When the balloon base 5 is inserted into the catheter body 2, the lumen 16 of the balloon base 5 is substantially the same as the outer diameter of the catheter body 2, so that the distal end portion into which the catheter body 2 is inserted is the inside of the balloon base 5. Bend and fit to fit into cavity 16. Therefore, the balloon base 5 is inclined with respect to the catheter body 2 by the eccentricity of the balloon base 5 in the completed state (FIG. 8). That is, when the balloon 3 is inflated, the balloon 3 is apparently inflated obliquely (FIG. 9). The inclination of the balloon 3 can be adjusted by changing the eccentric angle of the balloon base 5.

  A method of using this balloon catheter 1 will be described. Basically, it is the same as that described in the conventional system for administering a large amount of an anticancer drug to a patient with liver cancer shown in FIG. 12, and the balloon catheter 1 is inserted into the patient's blood vessel from its front end side, and the heart It is inserted into a curved blood vessel connecting the superior vena cava and inferior vena cava nearby, so that the balloon 3 is positioned in the curved blood vessel. Then, when physiological saline is sent through the balloon lumens 12 and 13 and the balloons 3 and 4 are inflated, the balloons 3 and 4 hit the inner wall of the blood vessel, and the balloon catheter 1 is placed and fixed (FIG. 10). At this time, since the balloon 3 is attached as described above, the balloon 3 is inflated obliquely so as to be inclined with respect to the catheter body 2. On the other hand, when the connector 23 of the balloon catheter 1 and one end of the circulation tube are connected outside the body, and the connector 24 and the other end of the circulation tube are connected, a mass administration system of an anticancer agent for liver cancer is constructed in a closed circuit, As shown in FIG. 12, in the state where the anticancer agent is continuously administered into the hepatic artery from the catheter 105 of the anticancer agent administration device, the system performs a blood purification action. At the time of purification, the anticancer agent administered in a large amount from the catheter 105 of the anticancer agent administration device is taken into the blood removal lumen 10 together with hepatic venous blood from the side hole 22 provided at the site blocked between the two balloons 3 and 4. . Thereafter, the blood is removed from the blood removal lumen 10, purified through the blood purifier F, and returned to the blood delivery lumen 11. The blood that has been purified and returned again is sent to the heart from the distal end opening of the balloon catheter 1, bypassing the site blocked by the balloons 3 and 4.

  In the operation of the system, the balloon 3 of the balloon catheter 1 is inflated obliquely so as to be inclined with respect to the catheter body 2, so that even a curved blood vessel as shown in FIG. The center axis does not shift. Therefore, the blood flow is along the central axis of the blood vessel as shown, and does not directly hit the blood vessel wall. In other words, due to the rigidity of the catheter itself as in the past, the central axis of the curved blood vessel lumen deviates from the central axis of the catheter and the blood flow directly hits the blood vessel wall, causing damage to the blood vessel wall. Will not cause. In addition, even a curved blood vessel can be securely placed and fixed, and the contact area of the balloon 3 with the blood vessel does not decrease, so that the balloon 3 is in close contact with the outer peripheral surface of the balloon base 5 even in a contracted state. The balloon 3 does not slip due to the pressure during blood feeding.

  In addition, the shaped balloon 175 cited as the prior art is wrinkled on the balloon in the deflated state, and the balloon surface is uneven, so that when the catheter of the shaped balloon is to be inserted into the blood vessel, There was a risk of damaging the inner wall of the blood vessel due to balloon wrinkles. However, the balloon 3 of the balloon catheter 1 is a flat balloon that can be brought into close contact with the outer peripheral surface of the base 5 in a deflated state, and does not cause unevenness. Therefore, even when the catheter is inserted into the lumen, There is no damage to the inner wall.

  In this embodiment, the catheter body 2, the balloon base 5, and the balloons 3 and 4 are made of a material suitable for a living body such as silicone rubber. Among these materials, PP, PE, PU, nylon Any material that is used in medical devices can be used.

<Modification>
FIG. 11 shows a modification, which is basically different from the above embodiment in that the balloon base 5a is integrally formed with the catheter body 2a, and is otherwise the same or similar. . Therefore, the same or similar configuration as the embodiment is given the same reference numeral as that of the embodiment, and an alphabet a is added to simplify the description.

  That is, the balloon base 5a is integrally provided at the front end of the catheter body 2a in a cylindrical shape having a diameter larger than the outer diameter of the catheter body. The balloon base 5a is formed so that the outer peripheral surface in the axial direction, in other words, the central axis constituted by the outer peripheral surface is inclined at a predetermined angle θ ° with respect to the central axis of the catheter body 2a, as is apparent from FIG. The balloon 3a is provided on the outer peripheral surface. The balloon 3a is the flat balloon described above, and inflated obliquely with respect to the central axis of the catheter body 2a. The predetermined angle θ ° is also in the range of 3 ° to 10 ° as described above. In the drawing, Z indicates an axis extending along the outer peripheral surface of the balloon base 5a and intersecting with the central axis Y of the catheter body 2a, and Z and Y form a predetermined angle θ °.

  The above embodiment is merely a preferred example, and it goes without saying that the design and the like of the details can be arbitrarily changed and modified within the scope of the present invention. For example, the inclination angle of the lumen 16 of the balloon base 5 and the shapes of the outer peripheral surfaces of the both end portions 19 and 20 of the base 15 can be appropriately designed in implementation. Further, the balloon base 5 may be formed integrally with the catheter body 2a as shown in a modified example, not as a separate body as shown in the example of the embodiment. Moreover, although the example which used the balloon catheter 1 for the mass administration system of the anticancer agent with respect to a liver cancer patient was shown in embodiment, it cannot be overemphasized that it can use also for another use.

1 balloon catheter 2, 2a catheter body 3, 3a balloon 4 balloon (second balloon)
5,5a Balloon base 6 Lumen 7 Septum 10, 10a Blood removal lumen 11, 11a Blood supply lumen 12, 13 Balloon lumen 15, 15a Base 16 Lumen 17 Water passage hole (communication path)
18 Central part 19, 20 Both end part 22, 22a Side hole 23, 24 Connector 25, 26 Connector

Claims (7)

An obliquely inflatable balloon catheter having a tubular catheter body having a predetermined length, a balloon base provided by being fitted to the front end of the catheter body,
A cylindrical base having a diameter larger than the outer diameter of the catheter body is formed, and a lumen having substantially the same diameter as the outer diameter of the catheter body is formed over the entire length by opening both ends. A balloon base characterized in that the axis is inclined at a predetermined angle with respect to the center axis of the base, and the outer peripheral surface in the axial direction is formed in parallel with the center axis of the base.   The balloon base according to claim 1, wherein the predetermined angle is 3 ° to 10 °.   The outer peripheral surface is composed of an outer peripheral surface of a central portion for attaching a balloon parallel to the center axis of the base, and outer peripheral surfaces of both end portions curved so as to gradually become smaller in diameter from the outer peripheral surface. The balloon base described in 1.   The balloon base according to any one of claims 1 to 3, wherein the balloon base is formed with a communication passage communicating the balloon lumen provided in the peripheral wall of the catheter body and the inside of the balloon.   The balloon base according to any one of claims 1 to 4, wherein a balloon is provided on an outer peripheral surface in an axial direction formed in parallel with a central axis of the base, and the balloon base provided with the balloon is a center of the base. The front end of the catheter body is fitted so that the axis is concentric with the central axis of the catheter body, and the balloon is inflated obliquely with respect to the center axis of the catheter body when inflated. An oblique inflatable balloon catheter characterized by the above.   The lumen of the catheter body is divided into a blood removal lumen for removing blood from the blood vessel and a blood supply lumen for sending blood to the blood vessel. The opening area of the blood removal lumen is that of the blood supply lumen. The obliquely inflatable balloon catheter according to claim 5, wherein the oblique inflatable balloon catheter is larger than the opening area.   A second balloon is provided in the catheter body behind the balloon by a predetermined length, and a side hole for taking blood into the blood removal lumen is provided in the catheter body between the second balloon and the balloon. Item 7. An obliquely inflatable balloon catheter according to Item 5 or 6.

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