Steerable catheter with adjustable bend location and/or radius and method
First Claim
1. A steerable catheter comprising a flexible elongate tubular member having proximal and distal extremities, a handle secured to the proximal extremity, said tubular member having a lumen extending therethrough, a mandrel slidably mounted in the lumen and extending into the distal extremity and means extending through the tubular member for causing bending of the distal extremity with respect to the mandrel disposed therein, said mandrel having a portion of reduced stiffness so that the bend location can be selected depending upon the position of the region of reduced thickness.
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Accused Products
Abstract
A steerable catheter comprising a flexible elongate tubular member having proximal and distal extremities, a handle secured to the proximal extremity, said tubular member having a lumen extending therethrough, a mandrel slidably mounted in the lumen and extending into the distal extremity and means extending through the tubular member for causing a bending of the distal extremity with respect to the mandrel disposed therein.
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Citations
23 Claims
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1. A steerable catheter comprising a flexible elongate tubular member having proximal and distal extremities, a handle secured to the proximal extremity, said tubular member having a lumen extending therethrough, a mandrel slidably mounted in the lumen and extending into the distal extremity and means extending through the tubular member for causing bending of the distal extremity with respect to the mandrel disposed therein, said mandrel having a portion of reduced stiffness so that the bend location can be selected depending upon the position of the region of reduced thickness.
- 2. A steerable catheter comprising a flexible elongate tubular member having proximal and distal extremities, a handle secured to the proximal extremity, said tubular member having a lumen extending therethrough, a mandrel slidably mounted in the lumen and extending into the distal extremity and means extending through the tubular member for causing bending of the distal extremity with respect to the mandrel disposed therein and memory means carried by the distal extremity of the flexible elongate tubular member having a memory which wishes to assume a straight shape to aid in returning the distal extremity of the flexible elongate member to a straight shape when the pull wire is released.
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4. A steerable catheter comprising a flexible elongate tubular member having proximal and distal extremities, a handle secured to the proximal extremity, said tubular member having a lumen extending therethrough, a mandrel slidably mounted in the lumen and extending into the distal extremity, means extending through the tubular member for causing bending of the distal extremity with respect to the mandrel disposed therein together with means carried by the handle for advancing and retracting the mandrel, said means carded by the handle for advancing and retracting the mandrel including a pin secured to the proximal extremity of the mandrel and a sleeve carried by the handle and rotatably mounted on the handle and means coupled to the sleeve and to the pin for causing longitudinal movement of the pin with respect to the handle upon rotation of the sleeve.
- 5. A steerable catheter comprising a flexible elongate tubular member having proximal and distal extremities, a handle secured to the proximal extremity, said flexible elongate tubular member comprising an inner shaft having at least one lumen extending therethrough, a coaxial sleeve mounted on the shaft, at least a portion of said shaft having a twist provided therein and a means for securing said sleeve to said shaft at opposite ends of said portion to retain said twist in said shaft, a pull wire extending through said at least one lumen and connected to the distal extremity of the flexible elongate tubular member and means carried by the handle and secured to the pull wire for retracting and advancing said pull wire, said sleeve being formed of a material having good torque transmitting properties, said pull wire being used for placing a bend in the distal extremity of the flexible elongate tubular member, said twist in said portion of said shaft serving to prevent the pull wire from selecting a preferred orientation when said portion of the shaft is formed into a bend.
- 10. In a steerable catheter having an adjustable bend location, a flexible elongate tubular member having proximal and distal extremities, a plurality of circumferentially spaced-apart flexible elements disposed in the distal extremity for causing bending of the distal extremity of the flexible elongate member and movable means disposed at the distal extremity of the flexible elongate member for selecting the location in the distal extremity where bending is to occur to thereby adjust the length of the flexible elongate member which extends beyond the bend, said movable means being in the form of a shape-memory element having a memory which makes it assume a straight position upon the application of an electrical current thereto and bypass means adjustable longitudinally of the shape-memory element for causing the current applied to the shape-memory element to bypass a portion of the length of the shape-memory element so that it remains flexible at that portion to provide a hinge point for the bend.
- 16. In a steerable catheter having an adjustable bend location, a flexible elongate tubular member having proximal and distal extremities, a plurality of circumferentially spaced-apart flexible elements disposed in the distal extremity for causing bending of the distal extremity of the flexible elongate member and movable means disposed at the distal extremity of the flexible elongate member for selecting the location in the distal extremity where bending is to occur to thereby adjust the length of the flexible elongate member which extends beyond the bend, said movable means being in the form of a plurality of stiffening elements, each having a weakened region providing a hinge point in a different longitudinal position of the stiffening element than the longitudinal positions of the other said stiffening elements.
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18. In a steerable catheter having an adjustable bend location, a flexible elongate tubular member having proximal and distal extremities, a plurality of circumferentially spaced-apart flexible elements disposed in the distal extremity for causing bending of the distal extremity of the flexible elongate member and movable means disposed at the distal extremity of the flexible elongate member for selecting the location in the distal extremity where bending is to occur to thereby adjust the length of the flexible elongate member which extends beyond the bend, said movable means being in the form of a telescoping assembly movable between collapsed and extended positions comprising at least first and second telescoping members telescopically mounted with respect to each other disposed in the distal extremity of the flexible elongate member, flexible elongate means extending to the proximal extremity of the flexible elongate member and coupled to said second telescoping member of said telescoping assembly for moving said telescoping assembly between said collapsed and extended positions, said flexible elongate means coupled to said telescoping assembly including a weakened longitudinal portion which forms a hinge point.
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19. A method for adjusting the bend location in a steerable catheter having a distal extremity, providing stiffening means within the distal extremity of the catheter, providing a hinge point in the stiffening means and adjusting the location of the hinge point longitudinally of the stiffening means to adjust the position of the hinge point whereby the length of the distal extremity of the catheter extending beyond the hinge point can be adjusted.
- 20. A method for preventing whipping of the distal extremity of a steerable catheter as the steerable catheter is rotated when a bend has been placed in the distal extremity of the steerable catheter of the type which is provided with an elongate shaft and having a centrally disposed lumen therein extending therethrough and an additional lumen disposed therein offset from the centrally disposed lumen and a coaxially mounted sleeve mounted on said shaft comprising imparting a twist to at least a portion of the shaft and securing opposite sides of the portion of the shaft having the portion therein to the sleeve to retain the twist in the shaft and placing a pull wire in the additional lumen in the shaft and secured to the distal extremity.
Specification