JP2021065436A - catheter - Google Patents

Abstract

To provide a bendable catheter capable of improving usability and reducing the number of man hours for production.SOLUTION: A catheter 1 comprises: an outer shaft 11; an inner lumen formed inside the outer shaft; operation wires 30 and 40 housed inside the outer shaft and outside the inner lumen; and a holding part 50 which is disposed at a distal end of the outer shaft to hold the distal end sides of the operation wires. The longitudinal length of a cross section of each operation wire on the distal end side is different from that of a cross section on the proximal end side.SELECTED DRAWING: Figure 2

Description

The present invention relates to a catheter.

Catheter used by inserting into a biological lumen such as vascular system, lymph gland system, biliary system, urinary tract system, airway system, digestive system, secretory gland and reproductive organ is known. In such a catheter, there is known a technique of bending the catheter in a direction intersecting in the longitudinal direction in order to position the distal end side of the catheter in the vicinity of a living tissue. For example, Patent Document 1 discloses that the catheter is curved by arranging a spacer on the side of the beam on the distal end side of the catheter. For example, Patent Document 2 discloses that a catheter is curved by using a pull wire compression coil that surrounds the pull wire. For example, Patent Documents 3 and 4 disclose that a wire (or operating line) is used to bend a catheter.

Japanese Unexamined Patent Publication No. 2014-097389 Special Table 2017-518122 Japanese Unexamined Patent Publication No. 2016-002345 Japanese Unexamined Patent Publication No. 2013-208150

However, the technique described in Patent Document 1 has a problem that the catheter cannot be curved (that is, it has a linear shape) at the portion where the spacer is arranged, and the usability is inferior. Further, the technique described in Patent Document 2 has a problem that the number of parts constituting the catheter is increased and the man-hours required for manufacturing the catheter are increased. Further, in the techniques described in Patent Documents 3 and 4, there is a problem that the catheter may be curved at an unintended position, which is inferior in usability.

The present invention has been made to solve at least a part of the above-mentioned problems, and an object of the present invention is to improve usability and reduce manufacturing man-hours in a bendable catheter.

The present invention has been made to solve at least a part of the above-mentioned problems, and can be realized as the following forms.

(1) According to one embodiment of the present invention, a catheter is provided. This catheter is arranged at an outer shaft, an inner lumen formed inside the outer shaft, an operation wire housed inside the outer shaft and outside the inner lumen, and a tip portion of the outer shaft. The operation wire includes a holding portion for holding the tip end side of the operation wire, and the operation wire has a difference between the longitudinal length in the cross section on the tip end side and the longitudinal length in the cross section on the proximal end side. ..

According to this configuration, the catheter comprises an operating wire held inside the outer shaft and outside the inner lumen. Therefore, the catheter can be curved as the operation wire is curved by pulling the proximal end side of the operation wire. Therefore, as compared with a configuration in which the catheter is curved using, for example, a spacer, the entire tip side of the catheter can be smoothly curved, and usability can be improved. Further, the man-hours for manufacturing the catheter can be reduced as compared with the configuration in which the catheter is curved by using, for example, a pull wire compression coil. Further, since the length of the operation wire in the longitudinal direction in the cross section on the tip side is different from the length in the longitudinal direction in the cross section on the proximal end side, the operation wire is connected between the distal end side and the proximal end side. The stiffness can be varied (ie, a stiffness gap is provided in the operating wire). Therefore, the catheter can be curved from the position where the rigidity gap of the operation wire is provided as a base point, and the usability can be improved. As a result, according to the catheter having this configuration, it is possible to improve the usability and reduce the manufacturing man-hours in the bendable catheter.

(2) In the catheter of the above-described form, the operation wire has a substantially cylindrical small-diameter portion, a substantially cylindrical large-diameter portion having a diameter larger than the small-diameter portion, and the small-diameter portion and the large-diameter portion. A reduced diameter portion arranged between the two may be provided.
According to this configuration, the operation wire is arranged between the substantially cylindrical small-diameter portion, the substantially cylindrical large-diameter portion having a larger diameter than the small-diameter portion, and the small-diameter portion and the large-diameter portion. Since the diameter-reduced portion is provided, the operation wire can be configured by the centerless score. Further, since the operation wire has a reduced diameter portion arranged between the small diameter portion and the large diameter portion, the rigidity of the operation wire can be gradually changed by the reduced diameter portion, and the operation wire may be broken or damaged. Can be suppressed.

(3) In the catheter of the above-described embodiment, the operation wire may have the small-diameter portion arranged on the distal end side of the large-diameter portion, and a part of the small-diameter portion may be held by the holding portion.
According to this configuration, since the small diameter portion of the operation wire is arranged on the distal end side of the large diameter portion, the distal end side of the catheter can be flexibly configured as compared with the proximal end side, and the safety of the catheter can be obtained. Can be improved.

(4) In the catheter of the above-described form, the operation wire includes a flat portion having a flat shape, a large diameter portion having a substantially cylindrical shape, and an intermediate portion arranged between the flat portion and the large diameter portion. You may prepare.
According to this configuration, the operation wire includes a flat portion having a flat shape, a large diameter portion having a substantially cylindrical shape, and an intermediate portion arranged between the flat portion and the large diameter portion. Therefore, for example, a substantially cylindrical portion is provided. By pressing one of the shaped members, a flat portion and an intermediate portion can be easily formed. Further, since the operation wire has a flat portion having a flat shape, the bending direction of the catheter when the operation wire is pulled can be set to the side with a short radius of the flat shape. Further, since the operation wire has an intermediate portion arranged between the flat portion and the large diameter portion, the rigidity of the operation wire can be gradually changed by the intermediate portion, and breakage or damage of the operation wire can be suppressed.

(5) In the catheter of the above-described embodiment, the flat portion of the operation wire may be arranged on the distal end side of the large-diameter portion, and a part of the flat portion may be held by the holding portion.
According to this configuration, since the flat portion of the operation wire is arranged on the distal end side of the large diameter portion, the distal end side of the catheter can be flexibly configured as compared with the proximal end side, and the safety of the catheter can be improved. Can be improved.

(6) In the catheter of the above-described embodiment, the operation wire includes a first operation wire and a second operation wire arranged at a position facing the first operation wire with the inner lumen interposed therebetween. The holding portion may hold the tip end side of the first operation wire and the tip end side of the second operation wire at the tip end portion of the outer shaft.
According to this configuration, the operation wire includes the first operation wire and the second operation wire arranged at a position facing the first operation wire with the inner lumen sandwiched therein, so that the first operation wire is included. The direction in which the catheter bends by the operation of the second operation wire and the direction in which the catheter bends by the operation of the second operation wire can be changed. Therefore, the usability of the catheter can be further improved.

(7) In the catheter of the above-described embodiment, the first operation wire and the second operation wire may have different lengths in the longitudinal direction in the cross section on the distal end side.
According to this configuration, since the length of the first operation wire and the second operation wire in the longitudinal direction in the cross section on the distal end side are different, the direction and curvature of the catheter curved by the operation of the first operation wire and the curvature. By manipulating the second operating wire, the direction and curvature of the catheter can be changed. Therefore, the usability of the catheter can be further improved.

(8) In the catheter of the above-described embodiment, the inner lumen for the first wire formed inside the outer shaft and outside the inner lumen and accommodating the first operation wire, and the inside of the outer shaft and the inner The inner lumen for the second wire, which is formed at a position facing the inner lumen for the first wire and accommodates the second operation wire, may be provided on the outside of the lumen so as to sandwich the inner lumen.
According to this configuration, since the first operation wire is housed in the inner lumen for the first wire and the second operation wire is housed in the inner lumen for the second wire, the first and second operations inside the outer shaft are performed. Wire interference can be suppressed.

The present invention can be realized in various aspects, for example, in the form of a catheter, a main body portion for a catheter, a catheter, a method for manufacturing the main body portion, and the like.

It is explanatory drawing which illustrated the structure of the catheter of 1st Embodiment. It is explanatory drawing which illustrated the cross-sectional structure of the distal end side of a catheter. It is explanatory drawing which illustrated the cross-sectional structure in B1-B1 line of FIG. 1 and FIG. It is explanatory drawing which illustrated the cross-sectional structure in B2-B2 line of FIG. 1 and FIG. It is explanatory drawing which illustrates the catheter with a curved tip. It is explanatory drawing which illustrated the cross-sectional structure of the distal end side of the catheter of 2nd Embodiment. It is explanatory drawing which illustrated the cross-sectional structure of the distal end side of the catheter of 3rd Embodiment. It is explanatory drawing which illustrated the cross-sectional structure in the B2-B2 line of the catheter of 4th Embodiment. It is explanatory drawing which illustrated the cross-sectional structure of the distal end side of the catheter of 5th Embodiment. It is explanatory drawing which illustrated the cross-sectional structure in the B2-B2 line of the catheter of the 6th Embodiment. It is explanatory drawing which illustrated the cross-sectional structure of the distal end side of the catheter of 7th Embodiment. It is explanatory drawing which illustrated the cross-sectional structure in C1-C1 line (FIG. 11) of the catheter of 7th Embodiment. It is explanatory drawing which illustrated the cross-sectional structure in C2-C2 line (FIG. 11) of the catheter of 7th Embodiment. It is explanatory drawing which illustrated the cross-sectional structure of the distal end side of the catheter of 8th Embodiment. It is explanatory drawing which illustrated the cross-sectional structure of the distal end side of the catheter of 9th Embodiment. It is explanatory drawing which illustrated the cross-sectional structure in the B2-B2 line of the catheter of the tenth embodiment.

<First Embodiment>
FIG. 1 is an explanatory view illustrating the configuration of the catheter 1 of the first embodiment. Catheter 1 is inserted into biological cavities such as vasculature, lymph gland system, biliary tract system, urinary tract system, air tract system, digestive system, secretory gland and reproductive organ, and is used to diagnose or treat the inside of the biological lumen. used. The catheter 1 includes a tubular (tubular) main body 10 and a connector 90 connected to the proximal end side of the main body 10.

In FIG. 1, the axis passing through the center of the catheter 1 is represented by the axis O (dashed line). In the example of FIG. 1, the axis O coincides with the axis passing through the centers of the main body 10 and the connector 90. However, the axis O may be different from each central axis of the main body 10 and the connector 90. FIG. 1 illustrates XYZ axes that are orthogonal to each other. The X-axis corresponds to the longitudinal direction (longitudinal direction) of the catheter 1, the Y-axis corresponds to the width direction of the catheter 1, and the Z-axis corresponds to the height direction of the catheter 1. The left side (-X-axis direction) of FIG. 1 is referred to as the "tip side" of the catheter 1 and each component, and the right side (+ X-axis direction) of FIG. 1 is referred to as the "base end side" of the catheter 1 and each component. For the catheter 1 and each component, the end located on the distal end side is referred to as the "tip", and the distal end and its vicinity are referred to as the "tip portion". Further, the end portion located on the proximal end side is referred to as a "base end", and the proximal end and its vicinity are referred to as a "base end portion". The distal end side is inserted into the living body, and the proximal end side is operated by a surgeon such as a doctor. These points are also common to FIGS. 1 and later.

FIG. 2 is an explanatory view illustrating a cross-sectional configuration on the distal end side of the catheter 1. FIG. 2 illustrates the cross-sectional configuration of a part A (FIG. 1: broken line frame) on the distal end side of the main body 10 of the catheter 1. FIG. 3 is an explanatory view illustrating the cross-sectional configuration of the lines B1-B1 of FIGS. 1 and 2. FIG. 4 is an explanatory view illustrating the cross-sectional configuration of the lines B2-B2 of FIGS. 1 and 2. The configuration of the main body 10 of the catheter 1 will be described with reference to FIGS. 2 to 4.

As shown in FIG. 2, the main body 10 includes an outer shaft 11, an inner shaft 12, an inner shaft 13 for the first wire, an inner shaft 14 for the second wire, a first operation wire 30, and a second operation. A wire 40, a holding portion 50, and a sealing member 111 are provided. The outer shaft 11 is an elongated member extending along the longitudinal direction (axis O) of the catheter 1. The outer shaft 11 has a hollow substantially cylindrical shape in which openings are formed at the tip end portion and the base end portion, respectively, and an inner cavity (outer lumen 11L) communicating both openings is formed inside. The outer diameter and length of the outer shaft 11 can be arbitrarily determined.

Like the outer shaft 11, the inner shaft 12 is an elongated member extending along the longitudinal direction of the catheter 1. The inner shaft 12 has a hollow substantially cylindrical shape in which openings are formed at the tip end portion and the base end portion, respectively, and an inner lumen (inner lumen 12L) that communicates both openings is formed inside. As shown in FIGS. 1 to 4, the inner shaft 12 is arranged inside the outer shaft 11, that is, on the outer lumen 11L. The outer diameter of the inner shaft 12 is smaller than the outer diameter of the outer shaft 11. The length of the inner shaft 12 is substantially the same as the length of the outer shaft 11.

Like the outer shaft 11, the inner shaft 13 for the first wire is a long member extending along the longitudinal direction of the catheter 1. The inner shaft 13 for the first wire has a hollow substantially cylindrical shape in which openings are formed at the tip end portion and the base end portion, respectively, and an inner cavity (inner lumen 13L for the first wire) is formed to communicate both openings inside. Is. As shown in FIGS. 1 to 4, the inner shaft 13 for the first wire is arranged side by side with the inner shaft 12 inside the outer shaft 11 and outside the inner shaft 12. In other words, the inner shaft 13 for the first wire is formed alongside the inner lumen 12L inside the outer shaft 11 and outside the inner lumen 12L. The outer diameter of the inner shaft 13 for the first wire is smaller than the outer diameters of the outer shaft 11 and the inner shaft 12. As shown in FIG. 2, the length of the inner shaft 13 for the first wire is shorter than the length of the outer shaft 11.

Like the outer shaft 11, the inner shaft 14 for the second wire is a long member extending along the longitudinal direction of the catheter 1. The inner shaft 14 for the second wire has a hollow substantially cylindrical shape in which openings are formed at the tip end portion and the base end portion, respectively, and an inner cavity (inner lumen 14L for the second wire) that communicates both openings is formed inside. Is. As shown in FIGS. 1 to 4, the inner shaft 14 for the second wire is located inside the outer shaft 11 and outside the inner shaft 12 at a position facing the inner shaft 13 for the first wire with the inner shaft 12 interposed therebetween. Have been placed. In other words, the inner shaft 14 for the second wire is formed at a position facing the inner lumen 13L for the wire with the inner lumen 12L sandwiched inside the outer shaft 11 and outside the inner lumen 12L. The outer diameter of the inner shaft 14 for the second wire is smaller than the outer diameters of the outer shaft 11, the inner shaft 12, and the inner shaft 13 for the first wire. As shown in FIG. 2, the length of the inner shaft 14 for the second wire is shorter than the length of the outer shaft 11.

The first operating wire 30 is a solid and elongated member extending along the longitudinal direction of the catheter 1. The first operation wire 30 has a small diameter portion 31, a reduced diameter portion 32, and a large diameter portion 33. The small diameter portion 31 is provided on the tip end side of the first operation wire 30. The small diameter portion 31 is a solid substantially cylindrical portion having a substantially constant outer diameter. Since the cross-sectional shape of the small diameter portion 31 is substantially circular as shown in FIG. 3, the length of the small diameter portion 31 in the cross section in the longitudinal direction is the outer diameter D1 of the circle (FIG. 2). The reduced diameter portion 32 is provided between the small diameter portion 31 and the large diameter portion 33. The reduced diameter portion 32 is a solid substantially truncated cone-shaped portion in which the outer diameter is gradually reduced from the proximal end side to the distal end side. The large diameter portion 33 is provided on the base end side of the first operation wire 30. The large diameter portion 33 is a solid substantially cylindrical portion having a substantially constant outer diameter. Since the cross-sectional shape of the large diameter portion 33 is substantially circular as shown in FIG. 4, the length of the large diameter portion 33 in the cross section in the longitudinal direction is the outer diameter D11 of the circle (FIG. 2).

Here, the outer diameter D11 of the large diameter portion 33 is larger than the outer diameter D1 of the small diameter portion 31. In other words, the large diameter portion 33 has a larger diameter than the small diameter portion 31. Further, the outer diameter of the base end of the reduced diameter portion 32 is substantially equal to the outer diameter D11 of the large diameter portion 33, and the outer diameter of the tip end is substantially equal to the outer diameter D1 of the small diameter portion 31. The outer diameters D1 and D11 can be arbitrarily determined as long as they are smaller than the inner diameter of the inner shaft 13 for the first wire. For such a first operation wire 30, for example, a long substantially cylindrical member having a substantially constant outer diameter D11 is prepared, and a part on the tip end side of this member is cut to reduce the diameter to the small diameter portion 31. It can be manufactured by forming the portion 32. The first operation wire 30 produced in this way is also referred to as a centerless score.

The first operation wire 30 is housed in the inner lumen 13L for the first wire formed inside the outer shaft 11 and outside the inner lumen 12L, more specifically, inside the inner shaft 13 for the first wire. .. As shown in FIGS. 2 and 3, the tip of the first operation wire 30 is held by the holding portion 50 with the outer shaft 11, the inner shaft 12, and the inner shaft 13 for the first wire. Further, the base end portion of the first operation wire 30 is wound and fixed to the first winding portion 92A described later (FIG. 2).

The second operating wire 40 is a solid and elongated member extending along the longitudinal direction of the catheter 1. The second operation wire 40 has a small diameter portion 41, a reduced diameter portion 42, and a large diameter portion 43. The small diameter portion 41 is provided on the tip end side of the second operation wire 40. The small diameter portion 41 is a solid substantially cylindrical portion having a substantially constant outer diameter. Since the cross-sectional shape of the small diameter portion 41 is substantially circular as shown in FIG. 3, the length of the small diameter portion 41 in the cross section in the longitudinal direction is the outer diameter D2 of the circle (FIG. 2). The reduced diameter portion 42 is provided between the small diameter portion 41 and the large diameter portion 43. The reduced diameter portion 42 is a solid substantially truncated cone-shaped portion in which the outer diameter is gradually reduced from the proximal end side to the distal end side. The large diameter portion 43 is provided on the base end side of the second operation wire 40. The large diameter portion 43 is a solid substantially cylindrical portion having a substantially constant outer diameter. Since the cross-sectional shape of the large diameter portion 43 is substantially circular as shown in FIG. 4, the length of the large diameter portion 43 in the cross section in the longitudinal direction is the outer diameter D21 of the circle (FIG. 2).

Here, the outer diameter D21 of the large diameter portion 43 is larger than the outer diameter D2 of the small diameter portion 41. In other words, the large diameter portion 43 has a larger diameter than the small diameter portion 41. Further, the outer diameter of the base end of the reduced diameter portion 42 is substantially equal to the outer diameter D21 of the large diameter portion 43, and the outer diameter of the tip end is substantially equal to the outer diameter D2 of the small diameter portion 41. The outer diameters D2 and D21 can be arbitrarily determined as long as they are smaller than the inner diameter of the inner shaft 14 for the second wire. In the illustrated example, the outer diameter D2 of the small diameter portion 41 is smaller than the outer diameter D1 of the small diameter portion 31, and the outer diameter D21 of the large diameter portion 43 is smaller than the outer diameter D11 of the large diameter portion 33. However, the outer diameters D2 and D1 and the outer diameters D21 and D11 may be substantially the same, or may have the opposite magnitude relationship. The second operation wire 40 can be manufactured by the same method as that of the first operation wire 30.

The second operation wire 40 is housed in the inner lumen 14L for the second wire formed inside the outer shaft 11 and outside the inner lumen 12L, more specifically, inside the inner shaft 14 for the second wire. .. As shown in FIGS. 2 and 3, the tip of the second operation wire 40 is held by the holding portion 50 with the outer shaft 11, the inner shaft 12, and the inner shaft 14 for the second wire. Further, the base end portion of the second operation wire 40 is wound and fixed to the second winding portion 92B, which will be described later (FIG. 2). The first operation wire 30 and the second operation wire 40 are also collectively referred to as an "operation wire".

The holding portion 50 is arranged at the tip end portion of the outer shaft 11, and is arranged on the tip end side of the inner shaft 12, the tip end side of the first operation wire 30 (specifically, the tip end portion of the small diameter portion 31), and the second. It is a member that holds the tip end side of the operation wire 40 (specifically, the tip end portion of the small diameter portion 41), the tip end side of the inner shaft 13 for the first wire, and the tip end side of the inner shaft 14 for the second wire. .. As shown in FIG. 2, the holding portion 50 is provided on the entire inner side of the outer shaft 11 and the outer side of the inner lumen 12L, but is not provided on the inner side of the inner shaft 12. Therefore, the inner lumen 12L of the inner shaft 12 can be used as a guide wire lumen for inserting a guide wire into the catheter 1 or as a lumen for a chemical solution for supplying a chemical solution to a living tissue.

The sealing member 111 is filled inside the outer shaft 11 and outside the inner shaft 12, the inner shaft 13 for the first wire, and the inner shaft 14 for the second wire on the proximal end side of the holding portion 50. (Fig. 2, Fig. 4). By providing the sealing member 111, the positions of the inner shaft 12, the inner shaft 13 for the first wire, and the inner shaft 14 for the second wire are displaced inside the outer shaft 11 (that is, inside the outer lumen 11L). It can be suppressed and the backup power of the catheter 1 can be improved.

The explanation will be continued by returning to FIG. The connector 90 is a member that is arranged at the base end portion 10p of the main body portion 10 and is gripped by the operator. The connector 90 includes a connector main body portion 91, a winding portion 92, and a blade portion 93. The connector main body 91 is hollow in which openings are formed at the tip 90d and the base end 90p, respectively, and a cavity communicating both openings is formed inside. A part of the base end side of the main body portion 10 is inserted and joined to the tip end side of the connector main body portion 91. Any bonding agent such as an epoxy adhesive can be used for bonding.

The winding unit 92 includes a first winding unit 92A and a second winding unit 92B. The first winding portion 92A and the second winding portion 92B each have a tubular or rod-shaped wire winding portion and a knob portion provided on the outside of the wire winding portion. The base end portion of the first operation wire 30 is wound and fixed to the wire winding portion of the first winding portion 92A. By rotating the knob portion of the first winding portion 92A clockwise, the proximal end portion of the first operating wire 30 is wound around the wire winding portion, thereby pulling the proximal end side of the first operating wire 30. Can be operated. By rotating the knob portion of the first take-up portion 92A counterclockwise, the base end portion of the first operation wire 30 is unwound from the wire winding portion, whereby the operation of loosening the first operation wire 30 can be performed. Similarly, the base end portion of the second operation wire 40 is wound and fixed to the wire winding portion of the second winding portion 92B. By rotating the knob portion of the second take-up portion 92B clockwise, the operation of pulling the base end side of the second operation wire 40 can be performed. Further, by rotating the knob portion of the second winding portion 92B counterclockwise, the operation of loosening the second operation wire 40 can be performed.

The blade portion 93 is two blade-shaped members provided on the base end side of the connector main body portion 91. The wing portion 93 is used when the operator grips the catheter 1. The blade portion 93 may have any shape and may be omitted. The blade portion 93 may be joined to the connector main body portion 91, or may be integrally formed with the connector main body portion 91.

The outer shaft 11, the inner shaft 12, the inner shaft 13 for the first wire, and the inner shaft 14 for the second wire preferably have antithrombotic properties, flexibility, and biocompatibility, and are formed of a resin material or a metal material. it can. As the resin material, for example, polyamide resin, polyolefin resin, polyester resin, polyurethane resin, silicon resin, fluororesin and the like can be adopted. As the metal material, for example, stainless steel such as SUS304, nickel titanium alloy, cobalt chromium alloy and the like can be adopted. In addition, it is preferable to use gold, platinum, tungsten, or an alloy containing these elements, which are radiation opaque materials, because the visibility under fluoroscopy can be improved.

The first operation wire 30 and the second operation wire 40 can be formed of, for example, a metal material such as stainless steel such as SUS304, nickel-titanium alloy, cobalt-chromium alloy, or tungsten alloy. The holding portion 50 and the sealing member 111 are preferably flexible, and can be formed of, for example, a resin material such as polyurethane or polyurethane elastomer. The connector 90 can be formed of, for example, a resin material such as polyamide, polypropylene, polycarbonate, polyacetal, or polyether sulfone. The above-mentioned materials are merely examples, and each member may be formed by using a known material other than the above.

FIG. 5 is an explanatory view illustrating the catheter 1 having a curved tip. In the catheter 1 as described above, the knob portion of the first take-up portion 92A is rotated clockwise to pull the proximal end side of the first operation wire 30, whereby the distal end side of the catheter 1 is outward ( It can be curved in the direction intersecting the longitudinal direction of the catheter 1). At this time, in the catheter 1, the first operation wire 30 is provided inside the outer shaft 11 with the portion where the rigidity of the first operation wire 30 changes, that is, the vicinity of the reduced diameter portion 32 as the base point P. It curves in the direction W1 (FIGS. 3 and 5). Similarly, the distal end side of the catheter 1 can be curved outward by rotating the knob portion of the second winding portion 92B clockwise and pulling the proximal end side of the second operating wire 40. .. At this time, in the catheter 1, the second operation wire 40 is provided inside the outer shaft 11 with the portion where the rigidity of the second operation wire 40 changes, that is, the vicinity of the reduced diameter portion 42 as the base point P. It curves in the direction W2 (FIGS. 3 and 5).

Here, as shown in FIG. 5, in the catheter 1, the radius of curvature r1 when curved in the first direction W1 and the radius of curvature r2 when curved in the second direction W2 are different. This is because the outer diameter of the first operation wire 30 and the outer diameter of the second operation wire 40 are different. By providing a plurality of operation wires having different outer diameters in this way, as shown in FIG. 5, the distal end side of the catheter 1 can be curved with different radius of curvature and in different directions. The outer diameters of the first operation wire 30 and the second operation wire 40 are different, the shapes of the reduced diameter portions 32 and 42 are different, or the positions where the reduced diameter portions 32 and 42 are provided are different. By making it possible, the radius of curvature r1 and r2 at the time of bending and the length of the bendable portion can be adjusted.

As described above, the catheter 1 of the first embodiment includes an operation wire (first operation wire 30, second operation wire 40) held inside the outer shaft 11 and outside the inner lumen 12L. Therefore, as described with reference to FIG. 5, the catheter 1 can be curved as the operation wire is curved by pulling the proximal end side of the operation wire. Therefore, as compared with a configuration in which the catheter 1 is curved by using, for example, a spacer, the entire tip side of the catheter 1 can be smoothly curved, and usability can be improved. Further, the manufacturing man-hours can be reduced as compared with the configuration in which the catheter 1 is curved by using, for example, a pull wire compression coil. Further, the operation wires (first operation wire 30, second operation wire 40) have a length in the longitudinal direction (D1, D2) in the cross section on the tip end side and a length in the longitudinal direction in the cross section on the base end side (D1, D2). Since D11 and D21) are different, the rigidity of the operation wire can be changed between the tip end side and the base end side (that is, a rigidity gap is provided in the operation wire). Therefore, as described with reference to FIG. 5, the catheter 1 can be curved with the location where the rigidity gap of the operation wire is provided as the base point P, and the usability can be improved. As a result, according to the catheter 1 of the first embodiment, it is possible to improve the usability and reduce the manufacturing man-hours in the bendable catheter.

Further, according to the catheter 1 of the first embodiment, the operation wires (first operation wire 30, second operation wire 40) are larger than the substantially cylindrical small diameter portions 31, 41 and the small diameter portions 31, 41. Since the large diameter portions 33 and 43 having a substantially cylindrical shape with a large diameter and the reduced diameter portions 32 and 42 arranged between the small diameter portions 31 and 41 and the large diameter portions 33 and 43 are provided, the centerless score is used. The operation wire can be configured. Further, since the operation wire has the reduced diameter portions 32, 42 arranged between the small diameter portions 31, 41 and the large diameter portions 33, 43, the rigidity of the operation wire is gradually changed by the reduced diameter portions 32, 42. It is possible to suppress breakage and damage of the operation wire. Further, as shown in FIG. 2, since the small diameter portions 31 and 41 are arranged on the distal end side of the large diameter portions 33 and 43, the distal end side of the catheter 1 is compared with the proximal end side. It can be flexibly configured and the safety of the catheter 1 can be improved.

Further, according to the catheter 1 of the first embodiment, the operation wire is arranged at a position facing the first operation wire 30 with the first operation wire 30 and the inner lumen 12L interposed therebetween. And include. Therefore, as shown in FIG. 5, the direction W1 in which the catheter 1 is curved by the operation of the first operation wire 30 and the direction W2 in which the catheter 1 is curved by the operation of the second operation wire 40 can be changed. Therefore, the usability of the catheter 1 can be further improved. Further, as shown in FIG. 2, the first operation wire 30 is housed in the inner lumen 13L for the first wire in the inner shaft 13 for the first wire, and the second operation wire 40 is housed in the inner shaft 14 for the second wire. It is housed in the inner lumen 14L for the second wire. Therefore, the interference of the first and second operating wires 30 and 40 inside the outer shaft 11 can be suppressed.

Further, according to the catheter 1 of the first embodiment, the first operation wire 30 and the second operation wire 40 are different in lengths D1 and D2 in the longitudinal direction in the cross section on the distal end side. Therefore, as described with reference to FIG. 5, the direction W1 and the curvature r1 in which the catheter 1 is curved by the operation of the first operation wire 30 and the direction W2 and the curvature r2 in which the catheter 1 is curved by the operation of the second operation wire 40 are set. Can be changed. Therefore, the usability of the catheter 1 can be further improved.

<Second Embodiment>
FIG. 6 is an explanatory view illustrating a cross-sectional configuration on the distal end side of the catheter 1a of the second embodiment. The catheter 1a of the second embodiment includes a first operation wire 30a in place of the first operation wire 30, and a second operation wire 40a in place of the second operation wire 40. The first operating wire 30a and the second operating wire 40a do not include the reduced diameter portion 32 and the reduced diameter portion 42 described in the first embodiment. Therefore, the first operation wire 30a and the second operation wire 40a have a rigidity gap at the boundary between the small diameter portions 31 and 41 and the large diameter portions 33 and 43. Further, the length of the small diameter portion 31 and the length of the small diameter portion 41 in the longitudinal direction (axis O direction) of the first operation wire 30a and the second operation wire 40a are different from each other. Therefore, in the catheter 1a, the starting point P1 of the curvature when the proximal end side of the first operating wire 30a is pulled and the starting point P2 of the curvature when the proximal end side of the second operating wire 40 is pulled are different from each other. doing.

As described above, the configurations of the first operation wire 30a and the second operation wire 40a can be changed in various ways, and the diameter reduction portions 32 and 42 may not be provided, and the small diameter portions 31 and 41 may be provided, respectively. They may have different lengths. The catheter 1a of the second embodiment can also have the same effect as that of the first embodiment described above. Further, in the catheter 1a of the second embodiment, the starting point P1 of the curvature when the proximal end side of the first operating wire 30a is pulled, and the starting point P2 of the curvature when the proximal end side of the second operating wire 40 is pulled. Therefore, the usability of the catheter 1a can be improved.

<Third Embodiment>
FIG. 7 is an explanatory view illustrating a cross-sectional configuration on the distal end side of the catheter 1b of the third embodiment. The catheter 1b of the third embodiment includes a first operation wire 30b instead of the first operation wire 30, and a second operation wire 40b instead of the second operation wire 40. The first operation wire 30b has the same configuration as the first operation wire 30 described with reference to FIG. 2 except that the large diameter portion 33b is arranged on the tip end side and the small diameter portion 31b is arranged on the proximal end side. have. Similarly, the second operation wire 40b is the same as the second operation wire 40 described with reference to FIG. 2, except that the large diameter portion 43b is arranged on the tip end side and the small diameter portion 41b is arranged on the proximal end side. It has a similar configuration. As described above, the configurations of the first operation wire 30a and the second operation wire 40a can be changed in various ways, and the large diameter portions 33 and 43 may be arranged on the tip side. The catheter 1b of the third embodiment can also have the same effect as that of the first embodiment described above.

<Fourth Embodiment>
FIG. 8 is an explanatory view illustrating the cross-sectional configuration of the catheter 1c of the fourth embodiment in the B2-B2 line. In the catheter 1c of the fourth embodiment, in addition to the respective configurations described in the first embodiment, the inner shaft 16 for the third wire, the inner shaft 17 for the fourth wire, the third operation wire 60, and the fourth It includes an operation wire 70.

The third wire inner shaft 16 is a long member extending along the longitudinal direction of the catheter 1c, similarly to the first wire inner shaft 13. The inner shaft 16 for the third wire has a hollow substantially cylindrical shape in which openings are formed at the tip end portion and the base end portion, respectively, and an inner cavity (inner lumen 16L for the third wire) is formed to communicate both openings inside. Is. As shown in FIG. 8, the inner shaft 16 for the third wire is equal to the inner shaft 13 for the first wire and the inner shaft 14 for the second wire in the circumferential direction inside the outer shaft 11 and outside the inner lumen 12L. They are placed at intervals. The outer diameter, length, and material of the inner shaft 16 for the third wire are substantially the same as the outer diameter, length, and material of the inner shaft 14 for the second wire, but these may be different.

The inner shaft 17 for the fourth wire is a long member extending along the longitudinal direction of the catheter 1c, similarly to the inner shaft 13 for the first wire. The inner shaft 17 for the fourth wire has a hollow substantially cylindrical shape in which openings are formed at the tip end portion and the base end portion, respectively, and an inner cavity (inner lumen 17L for the fourth wire) that communicates both openings is formed inside. Is. As shown in FIG. 8, the inner shaft 17 for the fourth wire is arranged inside the outer shaft 11 and outside the inner lumen 12L at a position facing the inner shaft 16 for the third wire with the inner lumen 12L interposed therebetween. There is. The outer diameter, length, and material of the inner shaft 17 for the fourth wire are substantially the same as the outer diameter, length, and material of the inner shaft 14 for the second wire, but these may be different.

Like the first operation wire 30, the third operation wire 60 is a solid and long member extending along the longitudinal direction of the catheter 1c, and has a small diameter portion 61 arranged on the distal end side and a proximal end. A large diameter portion 63 arranged on the side and a reduced diameter portion 62 arranged between them are provided. The third operation wire 60 is housed inside the outer shaft 11 and outside the inner lumen 12L (specifically, the inner lumen 16L for the third wire inside the inner shaft 16 for the third wire). The tip of the third operation wire 60 is held by the holding portion 50 as the outer shaft 11, the inner shaft 12, and the inner shafts 13, 14, 16, and 17 for the first to fourth wires. Further, the base end portion of the third operation wire 60 is wound and fixed to the third winding portion 92C (not shown). By pulling the proximal end side of the third operating wire 60, the distal end side of the catheter 1c can be curved in the third direction W3 where the third operating wire 60 is provided.

Like the first operation wire 30, the fourth operation wire 70 is a solid and long member extending along the longitudinal direction of the catheter 1c, and has a small diameter portion 71 arranged on the distal end side and a proximal end. A large diameter portion 73 arranged on the side and a reduced diameter portion 72 arranged between them are provided. The fourth operating wire 70 is housed inside the outer shaft 11 and outside the inner lumen 12L (specifically, the inner lumen 17L for the fourth wire inside the inner shaft 17 for the fourth wire). The tip of the fourth operation wire 70 is held by the holding portion 50 as the outer shaft 11, the inner shaft 12, and the inner shafts 13, 14, 16, and 17 for the first to fourth wires. Further, the base end portion of the fourth operation wire 70 is wound and fixed to the fourth winding portion 92D (not shown). By pulling the proximal end side of the fourth operating wire 70, the distal end side of the catheter 1c can be curved toward the fourth direction W4 where the fourth operating wire 70 is provided.

As described above, the configuration of the catheter 1c can be changed in various ways, and an arbitrary number of operation wires and an inner shaft for wires for accommodating each operation wire may be provided. In the example of FIG. 8, four operating wires 30, 40, 60, and 70 are illustrated, but the number of operating wires can be arbitrarily determined, and may be three or five or more. Further, in the example of FIG. 8, the case where the operation wires are arranged at equal intervals in the circumferential direction is illustrated, but the operation wires may not be arranged at equal intervals in the circumferential direction. The catheter 1c of the fourth embodiment can also have the same effect as that of the first embodiment described above. Further, in the catheter 1c of the fourth embodiment, since the catheter 1c can be bent in different directions W1 to W4 by the number of operating wires, the usability of the catheter 1c can be further improved.

<Fifth Embodiment>
FIG. 9 is an explanatory view illustrating a cross-sectional configuration on the distal end side of the catheter 1d according to the fifth embodiment. The catheter 1d of the fifth embodiment does not include the inner shaft 14 for the second wire and the second operation wire 40 in the configuration described in the first embodiment. As described above, the configuration of the catheter 1d can be changed in various ways, and may be configured to include only one operating wire (first operating wire 30). The catheter 1d of the fifth embodiment also has the same effect as that of the first embodiment described above.

<Sixth Embodiment>
FIG. 10 is an explanatory view illustrating the cross-sectional configuration of the catheter 1e of the sixth embodiment in the B2-B2 line. The catheter 1e of the sixth embodiment further includes a second inner shaft 18 in addition to the respective configurations described in the first embodiment. Like the inner shaft 12, the second inner shaft 18 is a long member extending along the longitudinal direction of the catheter 1e, and openings are formed at the tip end portion and the base end portion, respectively, and both openings are formed inside. It has a hollow substantially cylindrical shape in which a communicating lumen (second inner lumen 18L) is formed. Like the inner shaft 12, the opening on the tip end side of the second inner shaft 18 is not sealed by the holding portion 50 and is open. As shown in FIG. 10, the second inner shaft 18 is arranged side by side with the inner shaft 12 inside the outer shaft 11. The outer diameter, length, and material of the second inner shaft 18 are substantially the same as the outer diameter, length, and material of the inner shaft 12, but they may be different.

As described above, the configuration of the catheter 1e can be changed in various ways, and may be configured as a double lumen catheter including the inner shaft 12 and the second inner shaft 18. It may also be configured as a multi-lumen catheter with yet another inner shaft. The catheter 1e of the sixth embodiment can also have the same effect as that of the first embodiment described above.

<7th Embodiment>
FIG. 11 is an explanatory view illustrating a cross-sectional configuration on the distal end side of the catheter 1f of the seventh embodiment. FIG. 12 is an explanatory view illustrating the cross-sectional configuration of the catheter 1f of the seventh embodiment on the C1-C1 line (FIG. 11). FIG. 13 is an explanatory view illustrating the cross-sectional configuration of the catheter 1f of the seventh embodiment in line C2-C2 (FIG. 11). The catheter 1f of the first embodiment includes a first operation wire 30f instead of the first operation wire 30, and a second operation wire 40f instead of the second operation wire 40.

The first operating wire 30f is a solid and long member extending along the longitudinal direction of the catheter 1f, and has a flat portion 31f, an intermediate portion 32f, and a large diameter portion 33. The flat portion 31f is a solid substantially elliptical pillar-shaped portion provided on the tip end side of the first operation wire 30f. As shown in FIG. 12, the cross-sectional shape of the flat portion 31f is a substantially elliptical shape having a length in the longitudinal direction of D3a and a length in the lateral direction of D3b. Here, the length D3a in the longitudinal direction in the cross section of the flat portion 31f is longer than the outer diameter D11 of the large diameter portion 33. The intermediate portion 32f is provided between the flat portion 31f and the large diameter portion 33. The intermediate portion 32f is a portion in which the outer shape gradually changes (changes from a cylinder to an elliptical pillar) from the base end side to the tip end side. The large diameter portion 33 is the same as that of the first embodiment. The second operation wire 40f has a flat portion 41f, an intermediate portion 42f, and a large diameter portion 43. The detailed configuration is the same as that of the first operation wire 30f.

As described above, the configurations of the first operation wire 30f and the second operation wire 40f can be changed in various ways, and flat portions 31f and 41f are provided in place of the small diameter portions 31 and 41, and the reduced diameter portions 32 and 42 are provided. Alternatively, the intermediate portions 32f and 42f may be provided. The catheter 1f of the seventh embodiment also has the same effect as that of the first embodiment described above.

Further, in the catheter 1f of the seventh embodiment, the operation wires (first operation wire 30f, second operation wire 40f) include flat flat portions 31f and 41f, and substantially cylindrical large diameter portions 33 and 43. Since the intermediate portions 32f and 42f arranged between the flat portions 31f and 41f and the large diameter portions 33 and 43 are provided, for example, by pressing one of the substantially cylindrical members, the flat portions 31f and 41f And the intermediate portions 32f and 42f can be easily formed. Further, since the operation wire has flat portions 31f and 41f in a flat shape, the bending direction of the catheter 1f when the operation wire is pulled can be set to the side of the semi-minor axes W1 and W2 in the flat shape. Further, since the operation wire has intermediate portions 32f and 42f arranged between the flat portions 31f and 41f and the large diameter portions 33 and 43, the rigidity of the operation wire can be gradually changed by the intermediate portions 32f and 42f. It is possible to suppress breakage and damage of the operation wire. Further, since the flat portions 31f and 41f of the operation wire are arranged on the distal end side of the large diameter portions 33 and 43, the distal end side of the catheter 1f can be flexibly configured as compared with the proximal end side, and the catheter 1f Can improve the safety of.

<8th Embodiment>
FIG. 14 is an explanatory view illustrating a cross-sectional configuration on the distal end side of the catheter 1 g of the eighth embodiment. The catheter 1g of the eighth embodiment includes a holding portion 50g instead of the holding portion 50. The holding portion 50g has the same configuration as the holding portion 50 except that it is arranged on the proximal end side of the holding portion 50 of the first embodiment, that is, on the proximal end side of the tip of the outer shaft 11. ing. As described above, the configuration of the catheter 1g can be changed in various ways. For example, the holding portion 50g may be arranged at an arbitrary position on the distal end side of the catheter 1g. Further, for example, the sealing member 111 that seals the inside of the outer shaft 11 may be omitted. Even with 1 g of the catheter of the eighth embodiment as described above, the same effect as that of the first embodiment described above can be obtained.

<9th embodiment>
FIG. 15 is an explanatory view illustrating a cross-sectional configuration on the distal end side of the catheter 1h of the ninth embodiment. The catheter 1h of the ninth embodiment does not include the inner shaft 13 for the first wire, the inner shaft 14 for the second wire, and the sealing member 111 described in the first embodiment. In other words, in the catheter 1h, the first operating wire 30 and the second operating wire 40 are not housed in the inner shaft for wires, but are housed directly inside the outer shaft 11 and outside the inner lumen 12L. As described above, the configuration of the catheter 1h can be changed in various ways, and it is not necessary to include an inner shaft for accommodating the operation wire and a sealing member for sealing the inside of the outer shaft 11. Further, in the configuration of the ninth embodiment, a partition wall is further provided inside the outer shaft 11 and outside the inner lumen 12L to suppress interference between the first operation wire 30 and the second operation wire 40. You may. The catheter 1h of the ninth embodiment also has the same effect as that of the first embodiment described above.

<10th Embodiment>
FIG. 16 is an explanatory view illustrating the cross-sectional configuration of the catheter 1i according to the tenth embodiment in line B2-B2. The catheter 1i of the tenth embodiment includes an outer shaft 11i instead of the outer shaft 11 described in the first embodiment, and further includes an inner shaft 12, an inner shaft 13 for the first wire, and an inner shaft for the second wire. It does not have a shaft 14. The outer shaft 11i is a long and solid member extending along the longitudinal direction of the catheter 1i. An inner lumen 12L, an inner lumen 13L for the first wire, and an inner lumen 14L for the second wire are formed on the thick portion 11T of the outer shaft 11i, respectively. The configurations of the inner lumen 12L, the inner lumen 13L for the first wire, and the inner lumen 14L for the second wire are the same as those in the first embodiment. In such a tenth embodiment, the holding portion 50 is provided on the inside of the inner lumen 13L for the first wire and the inside of the inner lumen 14L for the second wire at the tip of the outer shaft 11i, respectively, and the first It holds the operation wire 30 and the second operation wire 40. The holding portion 50 may be integrally formed with the thick portion 11T at the tip end portion of the outer shaft 11i.

As described above, the configuration of the catheter 1i can be changed in various ways, and the inner lumen 12L and the inner lumen for the first and second wires are used with respect to the thick portion 11T of the outer shaft 11i without using the inner shaft. 13L and 14L may be formed. The catheter 1i of the tenth embodiment can also have the same effect as that of the first embodiment described above. Further, according to the catheter 1i of the tenth embodiment, since the inner shaft is not used, the number of parts constituting the catheter 1i and the manufacturing cost can be reduced, and the diameter of the catheter 1i can be reduced.

<Modified example of this embodiment>
The present invention is not limited to the above-described embodiment, and can be implemented in various aspects without departing from the gist thereof. For example, the following modifications are also possible.

[Modification 1]
In the first to tenth embodiments, the configurations of the catheters 1, 1a to 1i have been illustrated. However, the configuration of the catheter 1 can be changed in various ways. For example, in each of the above embodiments, the catheter 1 having the tubular main body 10 is illustrated, but the main body 10 has other components (for example, a balloon member, a mesh member made of a mesh-like wire, an electrode member). Etc.) may be provided. For example, in the above embodiment, a port for accessing the inner lumen 12L may be provided on the outer peripheral surface of the outer shaft 11. In other words, this port is a through hole that communicates the outer peripheral surface of the outer shaft 11 (that is, the outside of the catheter 1) with the inner lumen 12L.

[Modification 2]
In the first to tenth embodiments, the configurations of the first operation wires 30, 30a, 30b, 30f and the second operation wires 40, 40a, 40b, 40f are illustrated. However, the configuration of these operating wires can be changed in various ways. For example, the proximal end side of the operating wire may not be built in the take-up portion 92 and may be exposed to the outside of the catheter 1 from the proximal end side of the connector 90. For example, when the proximal end side of the first operating wire 30 and the proximal end side of the second operating wire 40 are connected to each other and one of the proximal ends (for example, the first operating wire 30) is wound up, A configuration may be adopted in which the proximal end side of the other (for example, the second operation wire 40) is extended.

For example, the first operation wire 30 has a large diameter from the tip side toward the base end side instead of a configuration having a small diameter portion 31, a reduced diameter portion 32, and a large diameter portion 33 from the tip end side toward the base end side. A configuration having a portion 33, a small diameter portion 31 (or a flat portion), and a large diameter portion 33 may be adopted. In this case, a rigidity gap is generated in the small diameter portion 31 (or flat portion) sandwiched between the large diameter portions 33 on the tip end side and the base end side. Therefore, the first operation wire 30 (that is, the catheter 1) can be curved with the small diameter portion 31 (or flat portion) as a base point. The same applies to the second operation wire 40.

For example, the first operation wire 30 has a configuration in which the small diameter portion 31, the reduced diameter portion 32, and the large diameter portion 33 are provided from the tip end side toward the proximal end side, and the first operating wire 30 is first from the distal end side toward the proximal end side. A configuration having a portion and a second portion may be adopted. The first portion and the second portion have substantially the same outer diameter and shape, but are formed of materials having different rigidity. In this way, a rigidity gap is generated at the boundary between the first portion and the second portion. Therefore, the first operation wire 30 (that is, the catheter 1) can be curved with the boundary between the first portion and the second portion as a base point. The same applies to the second operation wire 40.

For example, the cross-sectional shapes of the first operation wire 30 and the second operation wire 40 can be arbitrarily changed to a substantially circular shape, a substantially rectangular shape, a substantially polygonal shape, and the like. For example, the first operation wire 30 and the second operation wire 40 may be composed of a stranded wire obtained by twisting a plurality of strands.

[Modification 3]
The configurations of the catheters 1, 1a to 1i of the first to tenth embodiments and the configurations of the modified examples 1 and 2 may be appropriately combined. For example, the configuration including three or more operation wires described in the fourth embodiment, the configuration including one operation wire described in the fifth embodiment, or the double lumen (or multi-lumen) described in the sixth embodiment. ), The configuration including the holding portion 50 g described in the eighth embodiment, and the configuration not provided with the inner shaft for the wire described in the ninth embodiment, described in the second, third, and seventh embodiments. Operational wires of the configuration may be used. For example, in the configuration not including the inner shaft described in the tenth embodiment, the configuration including the operation wires of the configurations described in the second, third, and seventh embodiments may be adopted, and the configuration described in the fourth embodiment may be adopted. The configuration including three or more operating wires, the configuration including one operating wire described in the fifth embodiment, the double lumen (or multi-lumen) configuration described in the sixth embodiment, and the eighth embodiment. A configuration including the holding portion 50 g described in the embodiment may be adopted.

Although the present embodiment has been described above based on the embodiments and modifications, the embodiments of the above-described embodiments are for facilitating the understanding of the present embodiment and do not limit the present embodiment. This aspect may be modified or improved without departing from its spirit and claims, and this aspect includes its equivalents. In addition, if the technical feature is not described as essential in the present specification, it may be deleted as appropriate.

1,1a to 1i ... Connector 10 ... Main body 11,11i ... Outer shaft 12 ... Inner shaft 13 ... Inner shaft for 1st wire 14 ... Inner shaft for 2nd wire 16 ... Inner shaft for 3rd wire 17 ... 4th wire Inner shaft for 18 ... 2nd inner shaft 30, 30a, 30b, 30f ... 1st operation wire 31, 31b ... Small diameter part 31f ... Flat part 32 ... Reduced diameter part 32f ... Intermediate part 33, 33b ... Large diameter part 40, 40a, 40b, 40f ... Second operation wire 41, 41b ... Small diameter part 41f ... Flat part 42 ... Reduced diameter part 42f ... Intermediate part 43, 43b ... Large diameter part 50, 50g ... Holding part 60 ... Third operation wire 61 ... Small diameter part 62 ... Reduced diameter part 63 ... Large diameter part 70 ... 4th operation wire 71 ... Small diameter part 72 ... Reduced diameter part 73 ... Large diameter part 90 ... Connector 91 ... Connector body part 92 ... Winding part 92A ... 1st winding part 92B ... 2nd winding part 92C ... 3rd winding part 92D ... 4th winding part 93 ... Blade part 111 ... Sealing member

Claims (8)

It ’s a catheter,
Outer shaft and
The inner lumen formed inside the outer shaft and
An operating wire housed inside the outer shaft and outside the inner lumen,
It is provided with a holding portion which is arranged at the tip end portion of the outer shaft and holds the tip end side of the operation wire.
The operation wire is
A catheter in which the longitudinal length in the distal cross section and the longitudinal length in the proximal cross section are different. The catheter according to claim 1.
The operation wire has a substantially cylindrical small-diameter portion, a substantially cylindrical large-diameter portion having a diameter larger than the small-diameter portion, and a reduced diameter portion arranged between the small-diameter portion and the large-diameter portion. A catheter that comprises a part and. The catheter according to claim 2.
The operation wire is a catheter in which the small-diameter portion is arranged on the distal end side of the large-diameter portion, and a part of the small-diameter portion is held by the holding portion. The catheter according to claim 1.
The operation wire is a catheter including a flat portion having a flat shape, a large diameter portion having a substantially cylindrical shape, and an intermediate portion arranged between the flat portion and the large diameter portion. The catheter according to claim 4.
The operation wire is a catheter in which the flat portion is arranged on the distal end side of the large diameter portion, and a part of the flat portion is held by the holding portion. The catheter according to any one of claims 1 to 5.
The operation wire is
The first operation wire and
Includes a second operating wire located at a position facing the first operating wire with the inner lumen in between.
The holding portion is a catheter that holds the tip end side of the first operation wire and the tip end side of the second operation wire at the tip end portion of the outer shaft. The catheter according to claim 6.
A catheter in which the first operation wire and the second operation wire have different lengths in the longitudinal direction in the cross section on the distal end side. The catheter according to claim 6 or 7, further comprising.
An inner lumen for a first wire formed inside the outer shaft and outside the inner lumen and accommodating the first operation wire, and an inner lumen for the first wire.
With the inner lumen for the second wire formed at a position facing the inner lumen for the first wire and accommodating the second operation wire on the inside of the outer shaft and outside the inner lumen with the inner lumen in between. ,
A catheter.

Images