Tissue-removing catheter with adjustment mechanism
First Claim
1. A tissue-removing catheter comprising:
- an elongate catheter body configured for insertion into a body lumen of a subject, the catheter body having a proximal end portion, an opposite distal end portion, and a longitudinal axis extending between the distal and proximal end portions;
a tissue-removing element located adjacent the distal end portion of the catheter body configured to remove tissue from the body lumen;
first and second adjustment lines extending along the catheter body at circumferentially spaced apart locations about the longitudinal axis, the first and second adjustment lines having distal end portions attached to the catheter body at respective first and second connection points adjacent the distal end portion of the catheter body, and the first and second adjustment lines having opposite proximal end portions; and
an adjustment mechanism operatively connected to the proximal end portions of the first and second adjustment lines, wherein the adjustment mechanism is selectively operable to decrease an effective length of the first adjustment line extending between the first connection point and the adjustment mechanism to bend the distal end portion of the catheter body in a first direction and urge the tissue-removing element in the first direction, wherein the adjustment mechanism is selectively operable to decrease an effective length of the second adjustment line extending between the second connection point and the adjustment mechanism to bend the distal end portion of the catheter body in a second direction different than the first direction and urge the tissue-removing element in the second direction;
wherein the distal end portion includes a bending longitudinal portion and a proximally-adjacent longitudinal portion that is immediately proximal to the bending longitudinal portion;
wherein the catheter body includes a drive shaft extending along the longitudinal axis and a jacket extending circumferentially around the drive shaft;
wherein the catheter body further includes a support coil received in the jacket and extending circumferentially around the drive shaft; and
wherein the support coil is stiffer along the proximally-adjacent longitudinal portion than along the bending longitudinal portion such that the bending longitudinal portion of the catheter body has a bending stiffness that is less than a bending stiffness of the proximally-adjacent longitudinal portion of the catheter body.
1 Assignment
0 Petitions
Accused Products
Abstract
A tissue removing catheter includes an apposition mechanism that selectively imparts an axially compressive load on the catheter body to bend the catheter and urge a tissue-removing element toward a blood vessel wall. The apposition mechanism can include one or more adjustment lines and an adjustment mechanism for selectively tensioning one of the adjustment lines to impart the compressive load on the catheter body. Two adjustment lines can have diametrically opposed positions and be wound onto a spool of the adjustment mechanism in opposite directions so that rotation of the spool simultaneously shortens one adjustment line and lengthens the other. The catheter body can have a more flexible bending segment adjacent the tissue-removing element to promote bending near the tissue-removing element operative to urge the tissue-removing element in apposition with the blood vessel.
-
Citations
22 Claims
-
1. A tissue-removing catheter comprising:
-
an elongate catheter body configured for insertion into a body lumen of a subject, the catheter body having a proximal end portion, an opposite distal end portion, and a longitudinal axis extending between the distal and proximal end portions; a tissue-removing element located adjacent the distal end portion of the catheter body configured to remove tissue from the body lumen; first and second adjustment lines extending along the catheter body at circumferentially spaced apart locations about the longitudinal axis, the first and second adjustment lines having distal end portions attached to the catheter body at respective first and second connection points adjacent the distal end portion of the catheter body, and the first and second adjustment lines having opposite proximal end portions; and an adjustment mechanism operatively connected to the proximal end portions of the first and second adjustment lines, wherein the adjustment mechanism is selectively operable to decrease an effective length of the first adjustment line extending between the first connection point and the adjustment mechanism to bend the distal end portion of the catheter body in a first direction and urge the tissue-removing element in the first direction, wherein the adjustment mechanism is selectively operable to decrease an effective length of the second adjustment line extending between the second connection point and the adjustment mechanism to bend the distal end portion of the catheter body in a second direction different than the first direction and urge the tissue-removing element in the second direction; wherein the distal end portion includes a bending longitudinal portion and a proximally-adjacent longitudinal portion that is immediately proximal to the bending longitudinal portion; wherein the catheter body includes a drive shaft extending along the longitudinal axis and a jacket extending circumferentially around the drive shaft; wherein the catheter body further includes a support coil received in the jacket and extending circumferentially around the drive shaft; and wherein the support coil is stiffer along the proximally-adjacent longitudinal portion than along the bending longitudinal portion such that the bending longitudinal portion of the catheter body has a bending stiffness that is less than a bending stiffness of the proximally-adjacent longitudinal portion of the catheter body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
-
22. A tissue-removing catheter comprising:
-
an elongate catheter body configured for insertion into a body lumen of a subject, the catheter body having a proximal end portion, an opposite distal end portion, and a longitudinal axis extending between the distal and proximal end portions; a tissue-removing element located adjacent the distal end portion of the catheter body configured to remove tissue from the body lumen; first and second adjustment lines extending along the catheter body at circumferentially spaced apart locations about the longitudinal axis, the first and second adjustment lines having distal end portions attached to the catheter body at respective first and second connection points adjacent the distal end portion of the catheter body, and the first and second adjustment lines having opposite proximal end portions; and an adjustment mechanism operatively connected to the proximal end portions of the first and second adjustment lines, wherein the adjustment mechanism is selectively operable to decrease an effective length of the first adjustment line extending between the first connection point and the adjustment mechanism to bend the distal end portion of the catheter body in a first direction and urge the tissue-removing element in the first direction, wherein the adjustment mechanism is selectively operable to decrease an effective length of the second adjustment line extending between the second connection point and the adjustment mechanism to bend the distal end portion of the catheter body in a second direction different than the first direction and urge the tissue-removing element in the second direction; wherein the distal end portion includes a bending longitudinal portion and a proximally-adjacent longitudinal portion that is immediately proximal to the bending longitudinal portion; wherein the catheter body includes a drive shaft extending along the longitudinal axis and a jacket extending circumferentially around the drive shaft; wherein the catheter body further includes a braided reinforcement received in the jacket and extending circumferentially around the drive shaft; and wherein the braided reinforcement is stiffer along the proximally-adjacent longitudinal portion than along the bending longitudinal portion such that the bending longitudinal portion of the catheter body has a bending stiffness that is less than a bending stiffness of the proximally-adjacent longitudinal portion of the catheter body.
-
Specification