Asahi Intecc Co., Ltd.

Asahi Intec., Ltd.

Satoshi Nagano

Makoto Nishigishi

Naohiko Miyata

Tomihisa Kato

Hideaki Maki

Tadahiro Koike

Yuuya Kanazawa

Yumiko Nakagawa

Takashi Kato

Provided is a guidewire including a core shaft, an outer flexible tube, a stranded wire that extends parallel to the core shaft, and a hollow stranded-wire coil disposed in the outer flexible tube. The hollow stranded-wire coil is formed of multiple strands and surrounds the distal end portion of the core shaft and the stranded wire. Distal ends of the hollow stranded-wire coil, the core shaft, and the stranded wire are joined to a distal end of the outer flexible tube.

Medical guidewire

Provided is a guidewire including a core shaft, an outer flexible tube, and an inner flexible tube that surrounds a distal end portion of the core shaft. The inner flexible tube is disposed in the outer flexible tube so that a distal end thereof is positioned between the distal end of the core shaft and a proximal end of the core shaft so as to be separated from the core shaft. A first joint is formed so as to join the distal end of the inner flexible tube to the core shaft. At least one second joint is formed so as to join the outer flexible tube to the inner flexible tube. The at least one second joint is positioned between the first joint and the proximal end of the core shaft.

Provided is a guidewire including a core shaft, an outer flexible tube, a stranded wire that is disposed parallel to a distal end portion of the core shaft, and an inner flexible tube that surrounds a distal end portion of the core shaft and the stranded wire. The inner flexible tube is disposed in the outer flexible tube so that a distal end thereof is positioned between the distal ends of the core shaft and the stranded wire and a proximal end of the core shaft so as to be separated from the distal ends of the core shaft and the stranded wire. A joint is formed so as to join the distal end of the inner flexible tube, the core shaft, and the stranded wire to each other.

A guidewire includes a core shaft and a coil body wound around an outer periphery of the core shaft. A distal end portion of the core shaft and a distal end portion of the coil body is fixed to each other to form a most distal end portion. The coil body includes a linear portion and a bent portion, the linear portion extending in a distal direction from a proximal end of the coil body, the bent portion being provided on a distal side of the liner portion. The core shaft and the coil body located in the bent portion are fixed to each other with a fixing member.

Guidewire

In medical guide wire ( A), a tapered second helical spring ( ) is interposed continuously between a first helical spring ( ) and the third helical spring ( ) each wound around a leading end portion ( ). From a middle portion of the second helical spring ( ) to a leading top end of the first helical spring ( ), a spiral blood stream path ( ) is serially provided along a line gap (C ) of the helical springs ( ). A gap-stopper ( ) is provided between the leading end portion ( ) and the second helical spring ( ) in order to induce a high speed spiral blood flow ( ) along the spiral blood stream path ( ) when the leading end portion ( ) reaches a diseased area ( ). The high speed spiral blood flow ( ) provides the leading end portion ( ) with the advancing force (F) and the rotational force (T).

Medical guide wire

A medical guide wire which is to ensure a good maneuverability when inserting its front end portion into blood vessels while turning the front end portion around its axis so as to provide an improved remedial treatment with patients. For this purpose, a core elongation has a torsional rigidity coefficient of 16 or less in terms of K &times;10 . A helical spring has a helical diameter-to-line diameter ratio in the range of 2.5&tilde;3.5. Where the torsional rigidity coefficient is a divided value of (a maximum torsional stress based on a torsional moment to which the core member is subjected)/(the torsional moment to which the core member is subjected). The helical diameter-to-line diameter ratio is a value of (a mean value of outer and inner diameters of the helical spring)/(a line element diameter of the helical spring).

Growing community of inventors

Nagoya, Japan

Satoshi Nagano