System for bi-directionally controlling the cryo-tip of a cryoablation catheter
First Claim
1. A system for steering a catheter through the vasculature of a patient using bi-directional control, said system comprising:
- a tubular catheter structure having a proximal end and a distal end, wherein said tubular catheter structure includes a tube having a wall with an inner surface, wherein said wall is formed with a plurality of slits to define a plurality of axially-spaced wall portions separated by said slits, and wherein a plurality of non-adiacent wall portions are indented to form a first passageway along the inner surface and a plurality of non-adjacent wall portions are indented to form a second passageway along the inner surface;
a clockwise (CW) reel;
a first pull wire positioned in the first passageway and having a first end attached to said catheter structure and a second end attached to said CW reel, said first pull wire for deflecting said catheter structure distal end in a first direction in response to a rotation of said CW reel about a rotation axis, wherein said first passageway maintains said first pull wire along said inner wall during a movement of said first pull wire;
a counterclockwise (CCW) reel;
a second pull wire positioned in the second passageway and having a first end attached to said catheter structure and a second end attached to said CCW reel, said second pull wire for deflecting said catheter structure distal end in a second direction in response to a rotation of said CCW reel about the rotation axis, with the second direction being substantially coplanar and opposite to the first direction, wherein said second passageway maintains said second pull wire along said inner wall during a movement of said second pull wire; and
a means operable on said CW and CCW reels for applying a tension to said first pull wire to deflect said catheter structure distal end in the first direction and thereafter for delaying an application of tension to said second pull wire until at least a portion of said tension on said first pull wire is selectively released to respectively deflect said catheter structure distal end from the first direction to the second direction.
1 Assignment
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Accused Products
Abstract
A bi-directional system for actively deflecting the distal tip of a catheter includes a reconfigurable tube that is positioned proximal to the catheter'"'"'s distal tip. The tube is formed with slits that are arranged to allow the tube to be transformed from a relaxed, cylindrical configuration to a plurality of deflected configurations. First and second pull wires are provided, with each wire having a respective distal end that is attached to the distal end of the tube. Each wire extends to a catheter handle where it is attached to a respective reel. The reels can be rotated, back and forth, to selectively deflect or relax the tube. To ensure a smooth recovery after a relatively large deflection, a mechanism is disclosed for delaying an application of tension on one of the pull wires until at least a portion of any tension on the other pull wire is released.
88 Citations
14 Claims
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1. A system for steering a catheter through the vasculature of a patient using bi-directional control, said system comprising:
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a tubular catheter structure having a proximal end and a distal end, wherein said tubular catheter structure includes a tube having a wall with an inner surface, wherein said wall is formed with a plurality of slits to define a plurality of axially-spaced wall portions separated by said slits, and wherein a plurality of non-adiacent wall portions are indented to form a first passageway along the inner surface and a plurality of non-adjacent wall portions are indented to form a second passageway along the inner surface; a clockwise (CW) reel; a first pull wire positioned in the first passageway and having a first end attached to said catheter structure and a second end attached to said CW reel, said first pull wire for deflecting said catheter structure distal end in a first direction in response to a rotation of said CW reel about a rotation axis, wherein said first passageway maintains said first pull wire along said inner wall during a movement of said first pull wire; a counterclockwise (CCW) reel; a second pull wire positioned in the second passageway and having a first end attached to said catheter structure and a second end attached to said CCW reel, said second pull wire for deflecting said catheter structure distal end in a second direction in response to a rotation of said CCW reel about the rotation axis, with the second direction being substantially coplanar and opposite to the first direction, wherein said second passageway maintains said second pull wire along said inner wall during a movement of said second pull wire; and a means operable on said CW and CCW reels for applying a tension to said first pull wire to deflect said catheter structure distal end in the first direction and thereafter for delaying an application of tension to said second pull wire until at least a portion of said tension on said first pull wire is selectively released to respectively deflect said catheter structure distal end from the first direction to the second direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for steering a catheter through the vasculature of a patient using bi-directional control, said system comprising:
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a tubular catheter structure having a proximal end and a distal end, wherein said tubular catheter structure includes a tube having a wall with an inner surface, wherein said wall is formed with a plurality of slits to define a plurality of axially-spaced wall portions separated by said slits, and wherein a plurality of non-adjacent wall portions are indented to form a first passageway along the inner surface and a plurality of non-adjacent wall portions are indented to form a second passageway along the inner surface, and wherein said tube is transformable between a first, relaxed configuration wherein said tube is substantially cylindrical shaped and a second, deflected configuration; a catheter handle having a handle housing and connected to said proximal end of said tubular catheter structure; a clockwise (CW) reel attached to said handle housing for rotation relative to said handle housing about a rotation axis in a first rotation direction; a first pull wire positioned in the first passageway and having a first end attached to said catheter structure and a second end attached to said CW reel, said first pull wire for deflecting said catheter structure distal end in a first direction in response to a rotation of said CW reel about the rotation axis, wherein said first passageway maintains said first pull wire along said inner wall during a movement of said first pull wire; a counterclockwise (CCW) reel attached to said housing for rotation relative to said housing about the rotation axis in a second rotation direction opposite said first rotation direction; a second pull wire positioned in the second passageway and having a first end attached to said catheter structure and a second end attached to said CCW reel, said second pull wire for deflecting said catheter structure distal end in a second direction in response to a rotation of said CCW reel about the rotation axis, with the second direction being substantially coplanar and opposite to the first direction, wherein said second passageway maintains said second pull wire along said inner wall during a movement of said second pull wire; and a drive cog mounted on said handle housing for rotation about the rotation axis, said drive cog operable on said CW and CCW reels for applying a tension to said first pull wire to deflect said catheter structure distal end in the first direction and thereafter for delaying an application of tension to said second pull wire until at least a portion of said tension on said first pull wire is selectively released to respectively deflect said catheter structure distal end from the first direction to the second direction. - View Dependent Claims (11, 12, 13, 14)
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Specification