Insertion portion rigidity changeable catheter with balloon

Abstract

An insertion portion rigidity changeable catheter with a balloon has an insertion portion including a coil-shaped member which is extensible and contractible, with a compression length set to be a predetermined length, and a sheath which is a tube body with flexibility having a fluid conduit, includes a sheath main body surrounded by the coil-shaped member, and a sheath end portion provided at one end side of the sheath main body, and having a contact surface which one end surface of the coil-shaped member contacts, has one opening of the fluid conduit in the sheath end portion and has another opening of the fluid conduit at another end side of the sheath main body, an inflatable/deflatable balloon which is inflated by being supplied with a fluid via the one opening of the fluid conduit to expand to a diameter larger than an outside diameter of the sheath end portion, and is deflated by the fluid being discharged via the one opening to be brought into close contact with an outer circumferential face of the sheath end portion, and an operation section which is fixedly provided at another end side of the sheath, and includes an operation section main body including a fluid supply and discharge apparatus connection portion which is directly or indirectly connected to a fluid supply and discharge apparatus which performs supply of the fluid into the balloon via the fluid conduit, or discharge, and a slide member which is slidably disposed in an inner surface side of the operation section main body, and is disposed at another end side of the operation section main body by an elastic force of the coil-shaped member, wherein the fluid supply and discharge apparatus connection portion is fixed to the operation section main body, and the slide member is provided to freely advance and retract with respect to the fluid supply and discharge apparatus connection portion.

1 . An insertion portion rigidity changeable catheter with a balloon, comprising:
 an insertion portion comprising a coil-shaped member which is extensible and contractible, and includes a predetermined elastic force, with a compression length set to be a predetermined length, and a sheath which is a tube body with predetermined flexibility having a fluid conduit, includes a sheath main body surrounded by the coil-shaped member, and a sheath end portion provided at one end side of the sheath main body, having a diameter larger than the sheath main body and having a contact surface which one end surface of the coil-shaped member contacts, has one opening of the fluid conduit in the sheath end portion and has another opening of the fluid conduit at another end side of the sheath main body;   an inflatable/deflatable balloon which is provided at the sheath end portion of the sheath, and is configured to be inflated by being supplied with a fluid via the one opening of the fluid conduit to extend an outside diameter dimension to be a diameter larger than an outside diameter of the sheath end portion, and to be deflated by the fluid being discharged via the one opening to be brought into close contact with an outer circumferential face of the sheath end portion; and   an operation section which is fixedly provided at another end side of the sheath, and comprises an operation section main body including a fluid supply and discharge apparatus connection portion which is directly or indirectly connected to a fluid supply and discharge apparatus which performs supply of the fluid into the balloon via the fluid conduit, or discharge of the fluid in the balloon, and a slide member which is slidably disposed in an inner surface side of the operation section main body, and is disposed at another end side of the operation section main body by an elastic force which the coil-shaped member has,   wherein the fluid supply and discharge apparatus connection portion is fixed to the operation section main body, and the slide member is provided by having a configuration in which the slide member freely advances and retracts with respect to the fluid supply and discharge apparatus connection portion.   
     
     
         2 . The insertion portion rigidity changeable catheter with a balloon according to  claim 1 ,
 wherein the coil-shaped member is a coil spring in which an element wire with a predetermined wire diameter is deformed to a predetermined compression length at a predetermined pitch, having a predetermined elastic force with a predetermined natural length, and   the insertion portion is configured to have a first flexibility in which the coil-shaped member by which the sheath main body is surrounded has the natural length and a rigidity is flexible in a first operation state of the operation section, and configured to change to have a second flexibility in which the coil-shaped member by which the sheath main body is surrounded is brought into a close contact state and the rigidity is more rigid than the first flexibility in a second operation state of the operation section.   
     
     
         3 . The insertion portion rigidity changeable catheter with a balloon according to  claim 1 ,
 wherein in a distal end side winding portion of the coil-shaped member, a half of an entire circumference is a cutoff portion which is configured by being cut off, and a remaining half of the entire circumference is an unprocessed portion.   
     
     
         4 . The insertion portion rigidity changeable catheter with a balloon according to  claim 1 ,
 wherein the coil-shaped member includes a distal end side winding portion which is configured by an element wire which periodically changes to a small-diameter element wire in which an element wire diameter is a small diameter, and a large-diameter element wire in which the element wire diameter is a larger diameter by a predetermined dimension than the small-diameter element wire, and   in the distal end side winding portion, a half of an entire circumference is configured by a small-diameter wire winding portion formed by the small-diameter element wire, and a remaining half of the entire circumference is configured by the small-diameter wire winding portion formed by the small-diameter element wire.   
     
     
         5 . The insertion portion rigidity changeable catheter with a balloon according to  claim 3 ,
 wherein the cutoff portion is disposed in only a range from a position 100 mm from a distal end to 180 mm from the distal end.   
     
     
         6 . The insertion portion rigidity changeable catheter with a balloon according to  claim 4 ,
 wherein a range of the small-diameter wire winding portion in which the half of the entire circumference is formed by the small-diameter element wire is disposed in only a range from a position 100 mm from a distal end to 180 mm from the distal end.   
     
     
         7 . The insertion portion rigidity changeable catheter with a balloon according to  claim 1 ,
 wherein the inflatable and deflatable balloon has a large thickness at a balloon front end face, and is inflated into a conical shape at a time of balloon inflation.   
     
     
         8 . The insertion portion rigidity changeable catheter with a balloon according to  claim 1 ,
 wherein the inflatable and deflatable balloon inflates into a Y-shape at a time of balloon inflation.   
     
     
         9 . The insertion portion rigidity changeable catheter with a balloon according to  claim 1 ,
 wherein the coil-shaped member is extensible and contractible with respect to the fluid conduit in the tube body.