catheter

Abstract

To improve work efficiency of manipulation which is performed by using a catheter.SOLUTION: A catheter comprises: a shaft 2 which has a first lumen for a guide wire and a second lumen for fluid or for a conductor; and a handle 6. The handle has an outer cylinder 14 and an inner cylinder 16. The outer cylinder 14 has a first outer cylinder hole 24 for guide wire in a proximal end surface and a second outer cylinder hole 26 for fluid or conductor wire in a side surface. The inner cylinder 16 has a first inner cylinder hole 38 through which the shaft 2 inserts and a first recessed portion 40 reaching the first inner cylinder hole 38 on a side surface overlapping the second outer cylinder hole 26. The shaft 2 has a first lumen side hole 44 on a side surface overlapping a first recessed portion 40. A first front chamber 48 is divided by the outer cylinder 14 and the first recessed portion 40, and the second outer cylinder hole 26 and a first lumen side hole 44 are connected to a first front chamber 48. The first lumen opens on a proximal end surface of the shaft 2 and is connected to the first outer cylinder hole 24.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to catheters. [Background technology]

[0002] Conventionally, a multi-lumen catheter having multiple lumens has been known. For example, the catheter described in Patent Document 1 has a balloon lumen through which air passes to inflate a balloon provided at the tip of the catheter shaft, a contrast medium lumen through which a contrast medium passes, and a guidewire lumen through which a guidewire passes. In addition, a branch tube is inserted into each lumen. And, via each branch tube, an air injection syringe is connected to the balloon lumen, a contrast medium injection syringe is connected to the contrast medium lumen, and a guidewire is inserted into the guidewire lumen. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-229129 A Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional multi-lumen catheters, a branch tube is inserted into each lumen opening at the base end surface of the shaft to connect or pass through an external device such as a syringe or guide wire. This makes it easy for external devices to be concentrated in one catheter. When external devices are concentrated in another catheter, more care must be taken to avoid interference between the external devices and to distinguish between the external devices. For this reason, conventional catheters leave room for improvement in the operability of procedures using the catheter.

[0005] The present disclosure has been made in light of these circumstances, and has an object to provide a technique for improving the operability of procedures using a catheter. [Means for solving the problem]

[0006] An embodiment of the present disclosure is a catheter. The catheter includes a shaft having a first lumen through which a guidewire is passed and a second lumen through which a fluid or a conductor is passed, at least the tip side of which is inserted into the body, and a handle located on the base end side of the shaft. The handle includes an outer tube and an inner tube housed inside the outer tube. The outer tube has a first outer tube hole on the base end surface through which a guidewire is passed, communicating the inside and outside of the outer tube, and a second outer tube hole on the side surface through which a fluid or a conductor is passed, communicating the inside and outside of the outer tube. The inner tube has a first inner tube hole extending in the axial direction of the shaft and through which the shaft is passed, and has a first recess reaching the first inner tube hole on a side surface overlapping with the second outer tube hole as viewed from the radial direction of the shaft. The shaft has a first lumen side hole communicating with the inside of the second lumen and the outside of the shaft on a side surface overlapping with the first recess as viewed from the radial direction. The first front chamber is defined by the inner surface of the sheath and the first recess, and the second sheath hole and the first lumen side hole are connected to the first front chamber. The first lumen opens at the proximal end surface of the shaft and is connected to the first sheath hole.

[0007] Any combination of the above components and any conversion of the expression of the present disclosure between a method, an apparatus, a system, etc. are also valid as aspects of the present disclosure. Effect of the Invention

[0008] According to the present disclosure, it is possible to improve the operability of procedures using a catheter. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a catheter according to an embodiment. [Diagram 2] FIG. 2 is a cross-sectional view of the shaft taken along a radial direction. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along the line AA in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The present disclosure will be described below with reference to the drawings based on preferred embodiments. The embodiments are illustrative and do not limit the present disclosure, and all features and combinations thereof described in the embodiments are not necessarily essential to the present disclosure. The same or equivalent components, members, and processes shown in each drawing are given the same reference numerals, and duplicated descriptions are omitted as appropriate. In addition, the scale and shape of each part shown in each drawing are set for convenience to facilitate explanation, and are not to be interpreted as being limiting unless otherwise specified. In addition, when terms such as "first" and "second" are used in this specification or claims, unless otherwise specified, these terms do not represent any order or importance, but are intended to distinguish one configuration from another. In addition, some of the members that are not important in explaining the embodiment in each drawing are omitted.

[0011] FIG. 1 is a perspective view of a catheter 1 according to an embodiment. FIG. 1 illustrates a state in which a balloon 4 is expanded. The catheter 1 according to this embodiment includes, as an example, a shaft 2, a balloon 4, and a handle 6. The shaft 2 is a long tubular member. The shaft 2 is made of a known flexible material such as a resin, such as polyolefin or polyamide. The length of the shaft 2 is, for example, 600 mm to 3000 mm. The balloon 4 is located on the tip (distal end) side of the shaft 2. The handle 6 is located on the base (proximal end) side of the shaft 2.

[0012] Hereinafter, the side of the catheter 1 or shaft 2 on which the balloon 4 is disposed will be referred to simply as the "distal side", and the side on which the handle 6 is disposed will be referred to simply as the "base side". The direction in which the axis of the shaft 2 extends, in other words the longitudinal direction of the shaft 2, will be referred to as the "axial direction", and the direction perpendicular to the axial direction, in other words the transverse direction of the shaft 2, will be referred to as the "radial direction". At least the distal end of the shaft 2 is inserted into the body. This causes the balloon 4 to be delivered into the body. The balloon 4 has a known structure and will not be described here. The handle 6 is also called a hub, and is disposed outside the body and is held or operated by the practitioner.

[0013] 2 is a cross-sectional view of the shaft 2 along the radial direction. The shaft 2 is a multi-lumen shaft having at least a first lumen 8 and a second lumen 10. The number of lumens that the shaft 2 has may be two or more, and the shaft 2 of this embodiment has, as an example, a third lumen 12 in addition to the first lumen 8 and the second lumen 10. The first lumen 8 extends from the base end surface to the tip end surface of the shaft 2, and a guidewire is passed through it.

[0014] Fluid is passed through the second lumen 10 and the third lumen 12. The second lumen 10 extends from the base end surface of the shaft 2 into the balloon 4, and an opening on the tip side is connected to the inside of the balloon 4. A fluid for expanding the balloon 4, for example, a gas such as air, is passed through the second lumen 10. The gas flowing through the second lumen 10 is released into the balloon 4 from an opening on the tip side of the second lumen 10. The opening on the base end side of the second lumen 10 is sealed with an adhesive or the like.

[0015] The third lumen 12 extends from the base end surface to the tip end surface of the shaft 2. The shaft 2 also has a through hole (not shown) on the side near the balloon 4 that communicates with the inside of the third lumen 12 and the outside of the shaft 2. A liquid such as physiological saline or a contrast agent is passed through the third lumen 12. The liquid flowing through the third lumen 12 is discharged from the through hole to the outside of the shaft 2. The openings on the tip end side and base end side of the third lumen 12 are sealed with an adhesive or the like.

[0016] The catheter 1 of this embodiment is used as a gallstone removal balloon catheter as an example. In this case, a guide wire is passed through the first lumen 8, and the shaft 2 is inserted into the body along the guide wire, so that the balloon 4 is guided to the common bile duct. In addition, a contrast medium passed through the third lumen 12 is released near the balloon 4. This allows the position of the balloon 4 to be grasped from outside the body. Then, a fluid flows into the balloon 4 from the second lumen 10, and the balloon 4 expands. The expanded balloon 4 contacts the inner wall of the common bile duct. In this state, the catheter 1 is pulled out of the common bile duct. This allows the gallstones remaining in the common bile duct to be scraped out from the common bile duct to the duodenum side. In addition, physiological saline passed through the third lumen 12 is released near the balloon 4. This allows the gallstones remaining in the common bile duct to be washed out from the common bile duct to the duodenum side.

[0017] The catheter 1 can also be used for procedures other than gallstone removal. The manner of connection between the second lumen 10 and the balloon 4 and the manner of connection between the third lumen 12 and the outside of the shaft 2 are not particularly limited and can be set appropriately. For example, the second lumen 10 may extend to the tip surface of the shaft 2, and gas may be supplied from the second lumen 10 into the balloon 4 through a through hole (not shown) provided on the side surface of the shaft 2. The tip of the third lumen 12 may be located near the balloon 4, and liquid may be discharged from an opening on the tip side.

[0018] A conducting wire may be passed through the second lumen 10 or the third lumen 12. For example, when an electrode, a thermocouple, or the like is provided on the surface of the balloon 4 or the tip of the shaft 2, the tip side of the conducting wire is passed through the second lumen 10 or the third lumen 12 and electrically connected to the electrode or thermocouple. The base end side of the conducting wire is connected to an external device such as a power supply device. Furthermore, a fluid may be passed through the first lumen 8 in addition to the guidewire.

[0019] Figures 3 and 4 are perspective views of the handle 6. Figure 5 is an exploded perspective view of the handle 6. Figure 6 is a side view of the handle 6. Figure 7 is a cross-sectional view taken along line AA in Figure 6. Note that Figures 3, 4 and 7 also show the shaft 2. Also, the cover member 18 is omitted from Figure 6.

[0020] The handle 6 has an outer tube 14, an inner tube 16, and a cover member 18. The outer tube 14 is generally cylindrical and elongated in the axial direction, and has a generally cylindrical internal space. The outer tube 14 has an opening 20 at the tip end, and the inner tube 16 is housed inside the outer tube 14 through the opening 20. The outer tube 14 has a screw groove 22 on the outer surface at the tip end. The cover member 18 is roughly bowl-shaped, and has a screw groove (not shown) corresponding to the screw groove 22 on the inner surface. With the inner tube 16 housed inside the outer tube 14, the cover member 18 is screwed onto the tip end of the outer tube 14, thereby fixing the inner tube 16 inside the outer tube 14.

[0021] The outer cylinder 14, inner cylinder 16, and cover member 18 of this embodiment are made of known resins such as polycarbonate (PC), polysulfone (PSU), polyetherimide (PEI), etc., and can be formed by known injection molding or the like. The outer cylinder 14 is made of a translucent resin. Therefore, the inner cylinder 16 housed in the outer cylinder 14 can be seen from the outside. However, the outer cylinder 14 does not have to be translucent.

[0022] The outer cylinder 14 has a first outer cylinder hole 24, a second outer cylinder hole 26, and a third outer cylinder hole 28. The first outer cylinder hole 24 is disposed on the base end surface of the outer cylinder 14. The first outer cylinder hole 24 penetrates the tube wall of the base end surface in the axial direction, and communicates the inside and outside of the outer cylinder 14. A guide wire is passed through the first outer cylinder hole 24. In addition, a cylindrical first port 30 is disposed on the base end surface of the outer cylinder 14. The first port 30 is connected to the first outer cylinder hole 24, and protrudes from the base end surface of the outer cylinder 14 in the axial direction. As an example, the outer cylinder 14 and the first port 30 are integrally molded.

[0023] The second outer tube hole 26 is disposed on the side surface of the outer tube 14. The second outer tube hole 26 penetrates the tube wall on the side surface in the radial direction, and communicates the inside and outside of the outer tube 14. A fluid or a conducting wire that is passed through the second lumen 10 is passed through the second outer tube hole 26. A cylindrical second port 32 is disposed on the side surface of the outer tube 14. The second port 32 is connected to the second outer tube hole 26 and protrudes from the side surface of the outer tube 14 in a direction intersecting the axial direction, for example, in the radial direction. An external device, such as a syringe, that injects gas for expanding the balloon is connected to the second port 32. As an example, the outer tube 14 and the second port 32 are integrally molded.

[0024] The third outer cylinder hole 28 is disposed on the side surface of the outer cylinder 14. The third outer cylinder hole 28 penetrates the tube wall on the side surface in the radial direction and communicates the inside and outside of the outer cylinder 14. A fluid or a conductor wire that is passed through the third lumen 12 is passed through the third outer cylinder hole 28. A cylindrical third port 34 is disposed on the side surface of the outer cylinder 14. The third port 34 is connected to the third outer cylinder hole 28 and protrudes from the side surface of the outer cylinder 14 in a direction intersecting the axial direction, for example, in the radial direction. An external instrument, such as a syringe, for injecting physiological saline or a contrast agent is connected to the third port 34. As an example, the outer cylinder 14 and the third port 34 are integrally molded. As another example, the second outer cylinder hole 26 and the third outer cylinder hole 28 are aligned in the circumferential position of the outer cylinder 14 and are shifted from each other in the axial direction.

[0025] The outer cylinder 14 also has a fourth outer cylinder hole 36 on the side surface. The outer cylinder 14 of this embodiment has, for example, three fourth outer cylinder holes 36. The three fourth outer cylinder holes 36 are arranged at approximately equal intervals in the axial direction. Furthermore, each fourth outer cylinder hole 36 is arranged on the opposite side to the second outer cylinder hole 26 and the third outer cylinder hole 28 in the circumferential direction of the outer cylinder 14. Each fourth outer cylinder hole 36 penetrates the tube wall on the side surface in the radial direction, and communicates between the inside and outside of the outer cylinder 14. An adhesive is passed through each fourth outer cylinder hole 36.

[0026] The inner tube 16 is a generally cylindrical shape that is long in the axial direction, and has a first inner tube hole 38, a first recess 40, and a second recess 42. The first inner tube hole 38 is disposed at the approximate axis of the inner tube 16, and extends in the axial direction from the tip surface to the base end surface of the inner tube 16. The shaft 2 is passed through the first inner tube hole 38. Therefore, the inner tube 16 can also be said to be a support member for the shaft 2. In addition, although details will be described later, the inner tube 16 can also be regarded as a partition member that divides the internal space of the outer tube 14 into multiple chambers. In addition, the inner tube 16 has a shape that is far from a cylindrical shape in some parts, such as a flat plate portion sandwiched between the first recess 40 and a fifth recess 60 described later, a flat plate portion sandwiched between the second recess 42 and a sixth recess 62 described later, and a flat plate portion 56 described later. However, in this embodiment, such a part that is flat is also included in the "tube". Therefore, the surface of the portion of the inner tube 16 where there is no solid material, that is, the surface of the recess or notch provided on the side surface of the tube which is the basic shape, is also included in the side surface of the inner tube 16.

[0027] The first recess 40 is disposed on the side surface of the inner tube 16. The first recess 40 is a recessed or cut-out portion of the side surface of the inner tube 16. The first recess 40 has a depth that reaches the first inner tube hole 38. Therefore, the first inner tube hole 38 is opened in the first recess 40, and the side surface of the shaft 2 is exposed. As an example, the first recess 40 extends over approximately half the range in the circumferential direction of the inner tube 16. Therefore, the first recess 40 is approximately semi-cylindrical. Moreover, the first recess 40 is disposed so as to overlap with the second outer tube hole 26 when viewed from the radial direction.

[0028] The second recess 42 is disposed on the side surface of the inner tube 16. The second recess 42 is a recessed or cut-out portion of the side surface of the inner tube 16. The second recess 42 has a depth that reaches the first inner tube hole 38. Therefore, the first inner tube hole 38 is opened in the second recess 42, and the side surface of the shaft 2 is exposed. As an example, the second recess 42 extends over approximately half the range in the circumferential direction of the inner tube 16. Therefore, the second recess 42 is approximately semi-cylindrical. Moreover, the second recess 42 is disposed so as to overlap with the third outer tube hole 28 when viewed from the radial direction.

[0029] The shaft 2 has a first lumen side hole 44 and a second lumen side hole 46. The first lumen side hole 44 is disposed on a side surface overlapping the first recess 40 when viewed from the radial direction. The first lumen side hole 44 penetrates the tube wall on the side surface in the radial direction, and communicates between the inside of the second lumen 10 and the outside of the shaft 2. The second lumen side hole 46 is disposed on a side surface overlapping the second recess 42 when viewed from the radial direction. The second lumen side hole 46 penetrates the tube wall on the side surface in the radial direction, and communicates between the inside of the third lumen 12 and the outside of the shaft 2. The second lumen 10 is sealed with an adhesive or the like on the proximal side of the first lumen side hole 44. The third lumen 12 is sealed with an adhesive or the like on the proximal side of the second lumen side hole 46.

[0030] A first front chamber 48 is defined by the inner surface of the outer cylinder 14 and the first recess 40. The second outer cylinder hole 26 and the first lumen side hole 44 are each connected to the first front chamber 48. The gas for inflating the balloon 4 is supplied to the first front chamber 48 via the second port 32 and the second outer cylinder hole 26, and is sent from the first front chamber 48 into the second lumen 10 via the first lumen side hole 44.

[0031] A second anterior chamber 50 is defined by the inner surface of the outer cylinder 14 and the second recess 42. The third outer cylinder hole 28 and the second lumen side hole 46 are each connected to the second anterior chamber 50. Saline and contrast medium are supplied to the second anterior chamber 50 via the third port 34 and the third outer cylinder hole 28, and are sent from the second anterior chamber 50 into the third lumen 12 via the second lumen side hole 46.

[0032] Furthermore, the inner cylinder 16 has a third recess 52 at a position offset in the axial direction from the first recess 40. As an example, the inner cylinder 16 of the present embodiment has two third recesses 52 on the tip side of the first recess 40. The two third recesses 52 are arranged to sandwich the second front chamber 50 in the axial direction. An adhesive filling chamber 54 is defined by each third recess 52 and the inner surface of the outer cylinder 14.

[0033] The third recess 52 is a portion in which the side surface of the inner tube 16 is recessed or cut out over the entire circumferential area. In addition, the third recess 52 reaches the axis of the inner tube 16 in the area where the second outer tube hole 26 and the third outer tube hole 28 are arranged and in the area where the fourth outer tube hole 36 is arranged. Therefore, these two areas are connected to each other. Therefore, the part of the inner tube 16 on the tip side of the adhesive filling chamber 54 and the part on the base side of the adhesive filling chamber 54 are connected by two flat plate parts 56 arranged radially with the first inner tube hole 38 in between.

[0034] The handle 6 of this embodiment also has an adhesive filling chamber 54 between the base end surface (the surface on the inner space side) of the outer tube 14 and the base end surface of the inner tube 16. Specifically, the diameters of the inner space of the outer tube 14 and the inner tube 16 each become smaller toward the base end side. In other words, the basic shapes of the inner space of the outer tube 14 and the inner tube 16 are both approximately truncated cones. Therefore, the inner surface of the outer tube 14 and the outer surface of the inner tube 16 are inclined so as to approach the shaft 2 toward the base end side. The inclination angles of each side are approximately equal, and each side extends parallel to each other.

[0035] In addition, the diameter of the base end surface of the inner tube 16 is larger than the diameter of the base end surface of the outer tube 14. Therefore, the inner tube 16 can only enter partway into the internal space of the outer tube 14. As a result, a space is formed between the base end surface of the outer tube 14 and the base end surface of the inner tube 16. This space constitutes the adhesive filling chamber 54. When the cover member 18 is screwed into the screw groove 22 of the outer tube 14, the inner tube 16 is biased in a direction to be pushed into the internal space of the outer tube 14. As a result, the inner tube 16 is fixed to the outer tube 14.

[0036] Therefore, the handle 6 of this embodiment has three adhesive filling chambers 54 arranged in the axial direction. The first front chamber 48 is arranged between the base end side adhesive filling chamber 54 and the middle adhesive filling chamber 54. The second front chamber 50 is arranged between the middle adhesive filling chamber 54 and the tip end side adhesive filling chamber 54. Therefore, each front chamber is sandwiched between a pair of adhesive filling chambers 54. The fourth outer cylinder hole 36 is arranged on the side surface of the outer cylinder 14 overlapping with each third recess 52 as viewed from the radial direction. In addition, the fourth outer cylinder hole 36 is also arranged on the side surface of the outer cylinder 14 overlapping with the space between the base end surface of the outer cylinder 14 and the base end surface of the inner cylinder 16 as viewed from the radial direction. Therefore, the fourth outer cylinder hole 36 is connected to each adhesive filling chamber 54.

[0037] An adhesive such as a photocurable adhesive or a cyanoacrylate adhesive is injected from the outside of the handle 6 through the fourth outer cylinder hole 36, and the adhesive is filled into the adhesive filling chamber 54. This causes both axial sides of the first front chamber 48 and the second front chamber 50 to be airtightly sealed.

[0038] In this embodiment, the first front chamber 48 and the second front chamber 50 are aligned with each other in the axial direction. With this arrangement, it is easier to seal each front chamber using the adhesive filling chamber 54 than when the two front chambers are positioned at the same axial position but shifted in the circumferential direction of the handle 6.

[0039] The inner tube 16 also has a fourth recess 58 between the first recess 40 and the third recess 52, between the first recess 40 and the base end surface of the inner tube 16, and between the second recess 42 and each of the third recesses 52 in the axial direction. That is, the adhesive filling chamber 54 on the base end side, the fourth recess 58, the first front chamber 48, the fourth recess 58, and the middle adhesive filling chamber 54 are arranged in this order in the axial direction. Also, the middle adhesive filling chamber 54, the fourth recess 58, the second recess 42, the fourth recess 58, and the tip side adhesive filling chamber 54 are arranged in this order in the axial direction.

[0040] A buffer chamber is defined by each of the fourth recesses 58 and the inner surface of the outer cylinder 14. By arranging the buffer chamber between the first front chamber 48 and each of the adhesive filling chambers 54, it is possible to prevent the adhesive injected into the adhesive filling chamber 54 from flowing into the first front chamber 48. Similarly, by arranging the buffer chamber between the second front chamber 50 and each of the adhesive filling chambers 54, it is possible to prevent the adhesive injected into the adhesive filling chamber 54 from flowing into the second front chamber 50. Therefore, it is possible to prevent the adhesive from obstructing the passage of fluids or conductive wires.

[0041] In addition, the handle 6 of this embodiment has a gas vent passage that connects the adhesive filling chamber 54 and the outside of the handle 6, separate from the fourth outer cylinder hole 36. That is, the inner cylinder 16 has a fifth recess 60, for example, on the opposite side of the inner cylinder 16 from the first recess 40 in the circumferential direction. The fifth recess 60 is a part where a part of the side surface of the inner cylinder 16 is recessed or cut out. The part of the inner cylinder 16 sandwiched between the first recess 40 and the fifth recess 60 is approximately flat. The first recess 40 and the fifth recess 60 communicate with each other at least to the extent that gas can flow through a gap between the side end surface (the end surface in the radial direction) of the flat part located between them and the inner side surface of the outer cylinder 14.

[0042] The inner cylinder 16 also has a sixth recess 62 on the opposite side to the second recess 42 in the circumferential direction of the inner cylinder 16. The sixth recess 62 is a portion in which a part of the side surface of the inner cylinder 16 is recessed or cut out. The portion of the inner cylinder 16 sandwiched between the second recess 42 and the sixth recess 62 is substantially flat. The second recess 42 and the sixth recess 62 communicate with each other through a gap between the side end surface of the flat portion located between them and the inner side surface of the outer cylinder 14, to an extent that at least gas can flow therethrough.

[0043] The inner cylinder 16 also has a seventh recess 64 on the opposite side to each of the fourth recesses 58 in the circumferential direction of the inner cylinder 16. Each of the seventh recesses 64 is a portion in which a part of the side surface of the inner cylinder 16 is recessed or cut out. The portion of the inner cylinder 16 sandwiched between each of the fourth recesses 58 and each of the seventh recesses 64 is substantially flat. Each of the fourth recesses 58 and each of the seventh recesses 64 may or may not be in communication with each other to the extent that gas can flow through a gap between the side end surface of the flat portion located between them and the inner side surface of the outer cylinder 14.

[0044] In the axial direction, the fifth recess 60 and the sixth recess 62 are sandwiched between a pair of seventh recesses 64. The fifth recess 60 and the sixth recess 62 are separated from each of the seventh recesses 64 by a first partition 66. The side end surface of each of the first partitions 66 is in contact with the inner surface of the outer cylinder 14. Each of the first partitions 66 has a first groove 68 that is recessed in the radial direction in a part of the side end surface. Therefore, the fifth recess 60 and the sixth recess 62 are communicated with each of the seventh recesses 64 at least through the first groove 68. Each of the first partitions 66 may have a through hole that communicates the fifth recess 60 and the sixth recess 62 with each of the seventh recesses 64.

[0045] In the axial direction, each of the seventh recesses 64 is adjacent to one of the adhesive filling chambers 54. Therefore, the pair of seventh recesses 64 sandwiching the fifth recess 60 are respectively interposed between the fifth recess 60 and the base end side or the middle adhesive filling chamber 54. Similarly, the pair of seventh recesses 64 sandwiching the sixth recess 62 are respectively interposed between the sixth recess 62 and the middle or tip side adhesive filling chamber 54. Each of the seventh recesses 64 and each of the adhesive filling chambers 54 are respectively separated by a second partition wall 70. The side end surface of each of the second partition walls 70 is in contact with the inner surface of the outer cylinder 14. Each of the second partition walls 70 has a second groove 72 recessed in the radial direction in a part of the side end surface. Therefore, each of the seventh recesses 64 and each of the adhesive filling chambers 54 are communicated with each other at least through the second groove 72. Note that each of the second partition walls 70 may have a through hole that communicates each of the seventh recesses 64 and each of the adhesive filling chambers 54.

[0046] As an example, the adhesive filling chamber 54 is filled with adhesive as follows. That is, first, the handle 6 is oriented so that each of the fourth external cylinder holes 36 faces vertically upward. In this state, adhesive is injected into each of the adhesive filling chambers 54 from each of the fourth external cylinder holes 36. The adhesive falls due to gravity and begins to pool at the bottom end of each of the adhesive filling chambers 54. As the adhesive level rises, air in the adhesive filling chamber 54 flows through the second groove 72 into the seventh recess 64, and further flows through the first groove 68 into the fifth recess 60 or the sixth recess 62.

[0047] The air that flows into the fifth recess 60 flows into the first front chamber 48 through the gap between the side end face of the flat plate portion and the inner surface of the outer cylinder 14, and is discharged to the outside of the handle 6 through the second outer cylinder hole 26 and the second port 32. Similarly, the air that flows into the sixth recess 62 flows into the second front chamber 50 through the gap between the side end face of the flat plate portion and the inner surface of the outer cylinder 14, and is discharged to the outside of the handle 6 through the third outer cylinder hole 28 and the third port 34.

[0048] By providing a gas release flow path consisting of the second groove 72, the seventh recess 64, the first groove 68, the fifth recess 60, the first front chamber 48, the second outer cylinder hole 26, and the second port 32, and a gas release flow path consisting of the second groove 72, the seventh recess 64, the first groove 68, the sixth recess 62, the second front chamber 50, the third outer cylinder hole 28, and the third port 34, each adhesive filling chamber 54 can be filled up with adhesive more reliably. Therefore, the sealing property of the first front chamber 48 and the second front chamber 50 can be further improved. The adhesive is preferably injected into the adhesive filling chamber 54 until it starts to flow from the second groove 72 into the seventh recess 64. This can further improve the sealing property of the first front chamber 48 and the second front chamber 50.

[0049] The base end surface of the shaft 2 is directly in contact with the base end surface (surface on the inner space side) of the sheath 14. The first lumen 8 opens at the base end surface of the shaft 2. Therefore, the first lumen 8 is directly connected to the first sheath hole 24. The connection interface between the first lumen 8 and the first sheath hole 24 is sealed by the adhesive filled in the adhesive filling chamber 54 on the base end side. The shaft 2 has a plurality of third lumen side holes 74 on the side surface overlapping with the adhesive filling chamber 54 on the base end side as viewed from the radial direction. One of the third lumen side holes 74 penetrates the tube wall on the side surface in the radial direction and communicates between the inside of the second lumen 10 and the outside of the shaft 2. The other third lumen side hole 74 penetrates the tube wall on the side surface in the radial direction and communicates between the inside of the third lumen 12 and the outside of the shaft 2. When adhesive is injected into the adhesive filling chamber 54 on the proximal side, part of the adhesive enters the second lumen 10 and the third lumen 12 via the third lumen side hole 74. As a result, the second lumen 10 is sealed with adhesive on the proximal side of the first lumen side hole 44. Also, the third lumen 12 is sealed with adhesive on the proximal side of the second lumen side hole 46.

[0050] The base end surface of the shaft 2 may be located at the same position as the tip end surface of the adhesive filling chamber 54 in the axial direction or inside the adhesive filling chamber 54. In this case, a communication hole connecting the first lumen 8 and the first outer tube hole 24 is provided in the adhesive filling chamber 54. This communication hole can be formed, for example, by filling the adhesive filling chamber 54 with adhesive in a state where a wire or other such material is inserted into the first lumen 8 and the first outer tube hole 24, and then pulling out the wire after the adhesive has solidified. In other words, the hole remaining after the wire is pulled out becomes the communication hole.

[0051] The fifth recess 60 and the sixth recess 62 are provided with information display sections 76. The information display section 76 provided in the fifth recess 60 is provided with a mark related to the fluid and conductor wires to be passed through the second lumen 10. The information display section 76 provided in the sixth recess 62 is provided with a mark related to the fluid and conductor wires to be passed through the third lumen 12. In FIG. 4, as an example, a mark "B" is printed on the information display section 76 provided on the bottom surface of the fifth recess 60, and a mark "C" is printed on the information display section 76 provided on the bottom surface of the sixth recess 62. By providing the information display section 76 on the handle 6, the usability of the catheter 1 is improved, and therefore the operability of the procedure using the catheter 1 can be further improved.

[0052] As described above, the shaft 2 of this embodiment has a first lumen 8 for a guidewire and a second lumen 10 for a fluid or a conductor. The outer tube 14 has a first outer tube hole 24 for a guidewire on the base end surface, and a second outer tube hole 26 for a fluid or a conductor on the side surface. The inner tube 16 has a first inner tube hole 38 for the shaft 2 extending in the axial direction, and a first recess 40 on the side surface that overlaps with the second outer tube hole 26 and reaches the first inner tube hole 38. The shaft 2 has a first lumen side hole 44 on the side surface that overlaps with the first recess 40. The inner surface of the outer tube 14 and the first recess 40 define a first front chamber 48, and the second outer tube hole 26 and the first lumen side hole 44 are connected to the first front chamber 48. The first lumen 8 opens at the base end surface of the shaft 2 and is connected to the first outer tube hole 24.

[0053] This allows the first port 30 for the guidewire to be distributed on the proximal end surface of the handle 6, and the second port 32 for the fluid or conductor to be distributed on the side surface of the handle 6. This makes it possible to suppress the concentration of external instruments, and to reduce the care that must be taken to avoid interference between the external instruments and to distinguish between the external instruments. This makes it possible to improve the operability of the procedure using the catheter 1.

[0054] Also, the second port 32 for the fluid or the conductor is connected to the second lumen 10 via the first front chamber 48. This makes it possible to avoid inserting a branch pipe into the second lumen 10. When the branch pipe is press-fitted into the second lumen 10, the cross-sectional area of ​​the passage from the second port 32 to the tip of the second lumen 10 tends to be the smallest in the branch pipe. For this reason, the dimensions of the second lumen 10 are set based on the inner diameter of the branch pipe. In other words, the inner diameter of the branch pipe is set so that a desired flow rate of the fluid can be achieved in the branch pipe or a desired conductor can be inserted, and the dimensions of the second lumen 10 are set so that the set inner diameter of the branch pipe can be achieved.

[0055] In this case, the second lumen 10 becomes unnecessarily thick, which may lead to an increase in the diameter of the shaft 2 and a decrease in the number of lumens that can be formed in the shaft 2. In contrast, in the present embodiment, the second port 32 and the second lumen 10 are connected via the first front chamber 48, so it is possible to prevent the second lumen 10 from becoming unnecessarily thick. This makes it easier to reduce the diameter of the shaft 2 and increase the number of lumens.

[0056] Furthermore, by interposing the first front chamber 48 between the first lumen side hole 44 and the second outer tube hole 26, it becomes easier to position the two holes, in other words, to position the shaft 2 and the handle 6. Furthermore, when a conductor is passed through the second lumen 10, the conductor can be bent in the first front chamber 48. This allows the conductor to absorb the force when a pulling force is applied to the conductor at the bent portion. This makes it possible to prevent the conductor from breaking.

[0057] Moreover, the first lumen 8 opens at the base end surface of the shaft 2, and this base end surface is in direct contact with the base end surface of the outer tube 14. This makes it possible to avoid insertion of a branch pipe into the first lumen 8. When a branch pipe is press-fitted into the first lumen 8, the passage from the first port 30 to the tip of the first lumen 8 tends to have the smallest cross-sectional area in the branch pipe. For this reason, the dimensions of the first lumen 8 are set based on the inner diameter of the branch pipe. That is, the inner diameter of the branch pipe is set so that a desired guidewire can be inserted in the branch pipe, and the dimensions of the first lumen 8 are set so that the set inner diameter of the branch pipe can be achieved. In this case, the first lumen 8 becomes unnecessarily thick, which may lead to an increase in the diameter of the shaft 2 and a decrease in the number of lumens that can be formed in the shaft 2. In contrast, according to the present embodiment, insertion of a branch pipe into the first lumen 8 can be avoided, so that the first lumen 8 can be prevented from becoming unnecessarily thick, and it is easy to reduce the diameter of the shaft 2 and increase the number of lumens. Furthermore, even if the first lumen 8 and the first outer tube hole 24 are connected by a communication hole provided in the adhesive filling chamber 54, the insertion of a branch pipe into the first lumen 8 can be avoided, and the same effect can be achieved.

[0058] The shaft 2 of this embodiment has a third lumen 12 and a second lumen side hole 46 that communicates the inside of the third lumen 12 with the outside of the shaft 2. The handle 6 has a second front chamber 50 and a third outer cylinder hole 28 that communicates the second front chamber 50 with the outside of the handle 6. The second lumen side hole 46 is connected to the second front chamber 50. This allows a single handle 6 to supply multiple types of fluids to each lumen of the shaft 2 while preventing them from mixing with each other. Also, a single handle 6 allows fluids and conductive wires to pass through each lumen of the shaft 2. Also, a single handle 6 allows multiple conductive wires with different roles to pass through each lumen of the shaft 2. Therefore, the operability of the procedure using the catheter 1 can be further improved.

[0059] Moreover, the first anterior chamber 48 and the second anterior chamber 50 are each sealed by an adhesive filling chamber 54. This allows each anterior chamber to be sealed simply and with high accuracy. This improves the reliability of the catheter 1. Furthermore, a buffer chamber is provided between each anterior chamber and the adhesive filling chamber 54. This more reliably prevents the adhesive from flowing into each anterior chamber, improving the quality of the catheter 1.

[0060] The above describes the embodiments of the present disclosure in detail. The above-mentioned embodiments merely show specific examples of implementing the present disclosure. The contents of the embodiments do not limit the technical scope of the present disclosure, and many design changes such as changes, additions, and deletions of components are possible within the scope of the idea of ​​the present disclosure defined in the claims. A new embodiment with a design change has the effects of each of the combined embodiments and modifications. In the above-mentioned embodiments, the contents for which such design changes are possible are emphasized by adding notations such as "in this embodiment" and "in this embodiment", but design changes are permitted even in contents without such notations. Any combination of components included in each embodiment is also valid as an aspect of the present disclosure. The hatching on the cross section of the drawing does not limit the material of the object to which the hatching is added.

[0061] In the handle 6 of this embodiment, the first front chamber 48 and the second front chamber 50 are sealed by the adhesive filling chamber 54, but each front chamber may be sealed by a sealing member such as an O-ring in addition to or instead of the adhesive filling chamber 54. The first front chamber 48 may be disposed on the distal side of the second front chamber 50. The base end side adhesive filling chamber 54 may be defined by a third recess 52 provided in the inner tube 16 and the inner surface of the outer tube 14, similar to the other adhesive filling chambers 54. In this case, the inner tube 16 may be inserted into the internal space of the outer tube 14 until the base end surface abuts against the base end surface of the outer tube 14.

[0062] There is also no particular limit to the number of lumens or antechambers in the catheter 1, and it is possible to provide three or more lumens for passing fluids or conductors, and three or more antechambers corresponding to each lumen. There is also no particular limit to the presence or absence of a balloon 4, and the type and phase state (gas or liquid) of the fluid passed through each lumen, and these can be set appropriately depending on the procedure in which the catheter 1 is used.

[0063] In addition, a plurality of handles 6 can be used in combination. In addition, the handle 6 of this embodiment can be used in combination with a known handle such as a Y connector. For example, when the handle 6 of this embodiment is used in combination with a Y connector, the handle 6 and the Y connector are arranged with a deviation in the axial direction. The shaft 2 is passed through the first inner tube hole 38 of the inner tube 16 of the handle 6 and the main tube of the Y connector. The conducting wire is passed from the second port 32 of the handle 6 to the second lumen 10. The fluid is passed from the branch tube of the Y connector to the third lumen 12. In this case, the conducting wire is passed through the second lumen 10 via the first front chamber 48. On the other hand, the fluid is passed through the third lumen 12 without passing through the front chamber.

[0064] The embodiment may be specified by the items described below. [1st item] a shaft (2) having a first lumen (8) through which a guidewire is passed and a second lumen (10) through which a fluid or a conductor is passed, at least a tip side of which is inserted into the body; A handle (6) is located on the base end side of the shaft (2), The handle (6) has an outer cylinder (14) and an inner cylinder (16) housed inside the outer cylinder (14), the sheath (14) has a first sheath hole (24) on its proximal end surface, through which a guide wire is passed, communicating between the inside and outside of the sheath (14), and has a second sheath hole (26) on its side surface, through which a fluid or a conductor is passed, communicating between the inside and outside of the sheath (14); the inner cylinder (16) has a first inner cylinder hole (38) extending in the axial direction of the shaft (2) and through which the shaft (2) is passed, and has a first recess (40) that reaches the first inner cylinder hole (38) on a side surface that overlaps with the second outer cylinder hole (26) when viewed in the radial direction of the shaft (2); The shaft (2) has a first lumen side hole (44) that communicates between the inside of the second lumen (10) and the outside of the shaft (2) on a side surface that overlaps with the first recess (40) when viewed in the radial direction, a first front chamber (48) is defined by the inner surface of the outer cylinder (14) and the first recess (40), and the second outer cylinder hole (26) and the first lumen side hole (44) are connected to the first front chamber (48); The first lumen (8) opens at the proximal end surface of the shaft (2) and is connected to the first outer tube hole (24). Catheter (1). [Second item] The inner cylinder (16) has a third recess (52) at a position axially displaced from the first recess (40), and an adhesive filling chamber (54) is defined by the third recess (52) and the inner surface of the outer cylinder (14); The outer cylinder (14) has a fourth outer cylinder hole (36) on a side surface overlapping with the third recess (52) when viewed in the radial direction, through which an adhesive passes and communicates between the inside and outside of the outer cylinder (14). A catheter (1) as described in item 1. [3rd item] The inner cylinder (16) has a fourth recess (58) between the first recess (40) and the third recess (52) in the axial direction. A catheter (1) as described in item 2. [4th item] The base end surface of the shaft (2) is in direct contact with the base end surface of the outer cylinder (14). A catheter (1) according to any one of items 1 to 3. [Item 5] The outer cylinder (14) has a third outer cylinder hole (28) on a side surface thereof through which a fluid or a conducting wire is passed, communicating the inside and outside of the outer cylinder (14); the inner cylinder (16) has a second recess (42) that reaches the first inner cylinder hole (38) on a side surface that overlaps with the third outer cylinder hole (28) when viewed in the radial direction of the shaft (2); the shaft (2) has a third lumen (12) through which a fluid or a conducting wire is passed, and a second lumen side hole (46) that communicates between the inside of the third lumen (12) and the outside of the shaft (2) on a side surface overlapping the second recess (42) when viewed in the radial direction; a second front chamber (50) is defined by the inner surface of the outer cylinder (14) and the second recess (42), and the third outer cylinder hole (28) and the second lumen side hole (46) are connected to the second front chamber (50); A catheter (1) according to any one of items 1 to 4. [Item 6] The first front chamber (48) and the second front chamber (50) are aligned in the axial direction. A catheter (1) as described in item 5. [Explanation of symbols]

[0065] 1 catheter, 2 shaft, 6 handle, 8 first lumen, 10 second lumen, 12 third lumen, 14 outer tube, 16 inner tube, 24 first outer tube hole, 26 second outer tube hole, 28 third outer tube hole, 36 fourth outer tube hole, 38 first inner tube hole, 40 first recess, 42 second recess, 44 first lumen side hole, 46 second lumen side hole, 48 first front chamber, 50 second front chamber, 52 third recess, 54 adhesive filling chamber, 58 fourth recess.

Claims

1. a shaft having a first lumen through which a guide wire is passed and a second lumen through which a fluid or a conductor is passed, and at least a tip side of the shaft is inserted into the body; A handle located on a proximal end side of the shaft, The handle has an outer cylinder and an inner cylinder housed inside the outer cylinder, the sheath has a first sheath hole on a proximal end surface, through which the guide wire is passed, communicating between the inside and the outside of the sheath, and a second sheath hole on a side surface, through which the fluid or the conducting wire is passed, communicating between the inside and the outside of the sheath, the inner cylinder has a first inner cylinder hole extending in an axial direction of the shaft and through which the shaft is passed, and a first recessed portion that reaches the first inner cylinder hole on a side surface that overlaps with the second outer cylinder hole when viewed in a radial direction of the shaft, the shaft has a first lumen side hole, which communicates with the inside of the second lumen and the outside of the shaft, on a side surface overlapping with the first recess when viewed in the radial direction; a first front chamber is defined by an inner surface of the outer cylinder and the first recess, and the second outer cylinder hole and the first lumen side hole are connected to the first front chamber, The first lumen opens at a proximal end surface of the shaft and is connected to the first outer casing hole, the inner cylinder has a third recess at a position shifted in the axial direction from the first recess, and an adhesive filling chamber is defined by the third recess and an inner surface of the outer cylinder; the outer cylinder has a fourth outer cylinder hole through which an adhesive passes, communicating between the inside and the outside of the outer cylinder, on a side surface overlapping with the third recess as viewed in the radial direction; catheter.

2. The inner cylinder has a fourth recess between the first recess and the third recess in the axial direction. The catheter of claim 1.

3. The base end surface of the shaft is in direct contact with the base end side of the outer cylinder. The catheter according to claim 1 or 2.

4. the outer cylinder has a third outer cylinder hole on a side surface thereof through which a fluid or a conducting wire is passed, communicating the inside and the outside of the outer cylinder; the inner cylinder has a second recess that reaches the first inner cylinder hole on a side surface that overlaps with the third outer cylinder hole when viewed in a radial direction of the shaft, the shaft has a third lumen through which the fluid or the conducting wire is passed, and a second lumen side hole that communicates with the inside of the third lumen and the outside of the shaft on a side surface that overlaps with the second recess when viewed in the radial direction, a second front chamber is defined by an inner surface of the outer cylinder and the second recess, and the third outer cylinder hole and the second lumen side hole are connected to the second front chamber. The catheter according to claim 1 or 2.

5. The first front chamber and the second front chamber are aligned with each other in the axial direction. The catheter of claim 4.

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