Catheter
AssigneeTerumo Kabushiki Kaisha
InventorTakashi Ito
Life of this patent
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Abstract
A catheter is disclosed, which includes an inner tube, and a coil tube disposed on an outer peripheral side of the inner tube, the inner tube being a coil obtained by winding a wire. In addition, in the coil tube, a first coil and a second coil are arranged concentrically with each other. The first coil and the second coil have mutually different winding directions of the wire. Then, the inner tube and the coil tube are rotatable relative to each other around a central axis of the coil tube. In addition, in a natural state where no external force is applied to the catheter, a gap is formed between the inner tube and the coil tube.
Claims17
A catheter, the catheter comprising:
- an inner tube, the inner tube including a lumen with an open proximal end and an open distal end;
- a coil tube disposed on an outer peripheral side of the inner tube, the coil tube being a wound wire coil, the coil tube having at least one first coil and at least one second coil, the at least one second coil being located concentrically with the at least first coil and whose winding direction of the wound wire coil is different from that of the at least one first coil;
- a gap between the inner tube and the coil tube in a natural state in which the inner tube is rotatable relative to the coil tube around a central axis of the coil tube when no external force is applied to the catheter;
- and
- a rotary operation unit fixed to a proximal portion of the coil tube, the rotary operation unit configured to transmit a rotational force to the coil tube.
A catheter, the catheter comprising:
- an inner tube having a lumen with an open proximal end and an open distal end, the lumen of the inner tube configured to receive a guide wire, a treatment device, or a liquid material;
- a coil tube disposed on an outer peripheral side of the inner tube, the coil tube being a wound coil, the coil tube having at least one first coil and at least one second coil, the at least one second coil being located concentrically with the at least first coil and whose winding direction of the wound wire coil is different from that of the at least one first coil;
- and
- a gap between the inner tube and the coil tube in a natural state in which the inner tube is rotatable relative to the coil tube around a central axis of the coil tube when no external force is applied to the catheter.
A method for guiding a catheter to a target site in a living body, the method comprising:
- inserting the catheter into a living body, the catheter including an inner tube and a coil tube disposed on an outer peripheral side of the inner tube, the inner tube including a lumen, the lumen of the inner tube having an open proximal end and an open distal end, the coil tube being a wound coil, the coil tube having at least one first coil and at least one second coil, the at least one second coil being located concentrically with the at least first coil, and a gap between the inner tube and the coil tube in a natural state when no external force is applied to the catheter, and a winding direction of the at least one second coil being a different direction from a winding direction of the at least one first coil;
- and
- rotating the coil tube relative to the inner tube around a central axis of the coil tube while advancing the catheter in a biological lumen of the living body along a guide wire in the lumen of the inner tube.
Dependencies are inferred from the claim text.