Nipro Corporation

Keio University

Natsumi Shimazaki

Masahide Harada

Katsuya Miyagawa

Yuuki Nishimura

Yoshihiko Sano

Tomoe Morita

Tsunenori Arai

Misa Kakinoki

A control circuit for a sensor provided in a long member which can be inserted into a lumen to measure the flow velocity of a fluid in the lumen and a measurement device. The control circuit includes a drive circuit supplying a drive current to the sensor. A leakage current detection circuit detects a leakage current and performs an output corresponding to the detected leakage current. The leakage current detection circuit outputs a detection signal in response to detection of a leakage current exceeding a threshold value. A stop circuit stopping supply of the drive current to the sensor by the detection signal is further provided.

Sensor control circuit

A connector () is provided with a holding component (), a support component (), a terminal () electrically connected to a contact of a guide wire () held by the holding component (), and a guide component () rotatable around an axial line (A) of the guide wire () with respect to the support component (). The holding component () is provided with a body () having an insertion hole () for the guide wire () and a holding piece () extending along an axial line of the insertion hole () from the body () and capable of being elastically deformed inward in a radial direction with respect to the axial line. The guide component () has a guide surface () guiding the holding piece () inward in the radial direction. The holding component () is slid along the axis line of the insertion hole () with respect to the guide component (), whereby the holding piece abuts on the guide surface () to be elastically deformed inward in the radial direction.

Pressure measurement device, guide wire connector, guide wire, and method for manufacturing guide wire

A blood measurement device having high bending rigidity and having excellent propulsion properties and rotational force transmission properties in a blood vessel. A blood measurement device has a tubular shaft having flexibility, a tubular connection portion positioned coaxially with the distal end of the shaft and having an inner diameter larger than the inner diameter of the shaft, a slit communicating the inside and the outside of the connection portion, a tubular tip guide portion having flexibility coaxially connected to the distal end of the connection portion, a core material having flexibility fitted into the connection portion and extending to the distal end in the internal space of the tip guide portion to be connected to the tip guide portion, a measurement element positioned in the internal space of the tip guide portion and measuring the physical quantity of blood, and a signal wire which is extended from the measurement element to be inserted into and passed through the internal space of the shaft through the slit.

Sensor control circuit and blood measurement device

[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

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

Natsumi Shimazaki