Nipro Corporation

Keio University

Yuuki Nishimura

Katsuya Miyagawa

Natsumi Shimazaki

Misa Kakinoki

Nobuyuki Soeda

Tsunenori Arai

[Object] To provide an ablation system capable of suppressing heat damages to the lumen intima. [Solution] An ablation systemhas an ablation devicein which a balloonis provided on the distal end side of a shaftand an in-side tubecausing a fluid to flow into the balloon, the internal space of the shaftcausing a fluid to flow out of the balloon, and an optical fiberguiding laser light into the balloonare individually provided along the shaft, a laser light generating unitemitting laser light to the optical fiber, and a fluid returning unitreturning a fluid into the internal space of the balloon. The ablation devicehas a reflectorreflecting laser light emitted from the optical fiberin the balloon, in which the reflectoris movable along the axial directionin the balloonand is rotatable in the axial directionas the axis line.

Ablation system

Ablation system and ablation device

A balloon catheter () has a shaft () having an elastically expandable balloon () on the distal end side and space provided inside and allowing a fluid to flow into and flow out the balloon (), a heat generating member () provided in the internal space of the balloon (), and optical fibers (A,B) which are extended up to the internal space of the balloon () along the shaft () and emit light beams input into the proximal end to the heat generating member () from the distal end.

Balloon catheter

An atherectomy catheter has a shaft having an opening in the side wall, a cutter which is positioned near the opening in the internal space of the shaft and which can move in the axial direction of the shaft, and a distal end portion connected to the distal end of the shaft. The distal end portion has a blade tube connected to the distal end of the shaft by continuing the internal space, a reduced diameter portion connected to the distal end of the blade tube by continuing the internal space, and a distal end tip whose outer diameter is smaller than the outer diameter of the distal end of the blade tube, whose distal end side is projected outward from the distal end of the reduced diameter portion, and whose proximal end side is extended into the internal space of the blade tube through the internal space of the reduced diameter portion.

Atherectomy catheter

An atherectomy device has a drive circuit which rotates a direct-current motor. The drive circuit has a three-terminal regulator having an ADJ terminal. A partial pressure resistor is connected between the ADJ terminal and an output terminal of the three-terminal regulator. Moreover, one end of six variable resistors whose resistances are set to be different from each other is connected to the ADJ terminal. The other end of the six variable resistors is selectively connected to the negative electrode of a battery by a change-over switch which is a rotary switch having six contacts. When the variable resistors are switched by the change-over switch, the output current of the three-terminal regulator becomes large. Thus, the rotation speed of a cutter which is rotated by the direct-current motor becomes high.

Atherectomy device

A balloon catheter of novel configuration, which is capable of both efficiently heating a heating element by using a laser light and of ensuring durability by avoiding the laser light directly heating members other than the heating element. Provided is a balloon catheter with a balloon disposed in a distal end section of a shaft and wherein: a tightly wound coil shaped heating element is housed and arranged in the balloon; an optical fiber that irradiates a laser light inside the heating element is disposed; and a supply path that supplies a fluid to inside the balloon through an inside of the heating element and a discharge path that discharges the fluid from inside the balloon through a discharge port positioned on an outside of the heating element are disposed.

Growing community of inventors

Osaka, Japan

Yuuki Nishimura