Angioplasty balloon having selectively deployable cutting or scoring element and related methods
Balloon angioplasty catheters having cutting or scoring members that are moveable in at least one direction between a stowed position (away from the angioplasty balloon) and an operative position (on the angioplasty balloon). A balloon catheter of the present invention alternately useable to perform balloon dilation of a body lumen with and without concurrent cutting or scoring.
1. A device comprising:
an elongate catheter shaft;
an inflatable balloon positioned on the catheter shaft; and
a cutting or scoring member that is axially moveable relative to the catheter shaft along a longitudinal axis of the catheter shaft from a first position in which the cutting or scoring member is positioned to perform a cutting or scoring function, the cutting or scoring member comprising an elongate member that extends over the balloon when the cutting or scoring member is in the first position, to a second position in which the cutting or scoring member is not positioned to perform a cutting or scoring function,
wherein a distal portion of the cutting or scoring member is attached to a distal portion of the catheter shaft when the cutting or scoring member is in the first position, and
wherein the elongate member forms helical convolutions around the balloon when the cutting or scoring member is in the first position and the balloon is in an inflated configuration.
2. The device of claim 1 , wherein the cutting or scoring member comprises a wire.
3. The device of claim 1 , wherein the cutting or scoring member comprises an elastic or superelastic material.
4. The device of claim 1 , wherein the cutting or scoring member assumes a substantially linear configuration when the cutting or scoring member is in the second position.
5. The device of claim 1 , wherein the balloon defines an outer surface, and wherein:
when the cutting or scoring member is in the first position, the cutting or scoring member extends over the outer surface of the balloon, such that the cutting or scoring member is positioned to perform the cutting or scoring function upon inflation of the balloon when the cutting or scoring member is in the first position, and
when the cutting or scoring member is in the second position, the cutting or scoring member does not extend over at least a portion of the outer surface of the balloon, such that the cutting or scoring member is not positioned to perform the cutting or scoring function upon inflation of the balloon when the cutting or scoring member is in the second position.
6. The device of claim 1 , wherein the distal portion of the cutting or scoring member is attached to the distal portion of the catheter shaft by a releasable attachment when the cutting or scoring member is in the first position, and wherein the cutting or scoring member is configured to be proximally withdrawn into a lumen of the catheter shaft when the releasable attachment is released.
7. The device of claim 1 , wherein the catheter shaft defines a lumen, and wherein the cutting or scoring member is positioned within the lumen and proximal to the balloon when the cutting or scoring member is in the second position.
8. The device of claim 7 , wherein the lumen comprises a first lumen, and wherein the catheter shaft further defines a second lumen configured to receive an inflation fluid for inflating or deflating the balloon.
9. The device of claim 7 , wherein the cutting or scoring member is configured to assume a substantially linear configuration within the lumen when the cutting or scoring member is in the second position.
10. The device of claim 7 , wherein the catheter shaft includes an outer wall that defines an opening proximal to the balloon, and wherein the cutting or scoring member is axially moveable from the first position to the second position by at least proximally withdrawing the cutting or scoring member through the opening and into the lumen of the catheter shaft.
11. The device of claim 1 , wherein the cutting or scoring member is configured to deliver at least one of radiofrequency energy or thermal energy to patient tissue.
12. A device comprising:
an elongate catheter shaft defining a lumen;
an inflatable balloon positioned on the catheter shaft; and
an elongate cutting or scoring member attached to a distal portion of the catheter shaft via a releasable attachment when the cutting or scoring member is in a first position in which the cutting or scoring member extends over the balloon,
wherein the cutting or scoring member is axially moveable relative to the catheter shaft along a longitudinal axis of the catheter shaft from the first position to a second position when the releasable attachment is released, wherein the cutting or scoring member is positioned within the lumen when the cutting or scoring member is in the second position.
13. The device of claim 12 , wherein the cutting or scoring member extends over the balloon by forming loops or convolutions around the balloon when the cutting or scoring member is in the first position.
14. The device of claim 12 , wherein the cutting or scoring member assumes a substantially linear configuration within the lumen when the cutting or scoring member is in the second position.
15. The device of claim 12 , wherein the cutting or scoring member is configured to deliver at least one of radiofrequency energy or thermal energy to patient tissue.
16. A method comprising:
advancing a device through a body lumen of a patient, the device comprising:
an elongate catheter shaft;
an inflatable balloon positioned on the catheter shaft; and
a cutting or scoring member that is axially moveable relative to the catheter shaft along a longitudinal axis of the catheter shaft from a first position in which the cutting or scoring member is positioned to perform a cutting or scoring function, the cutting or scoring member comprising an elongate member that extends over the balloon when the cutting or scoring member is in the first position, to a second position in which the cutting or scoring member is not positioned to perform a cutting or scoring function,
wherein a distal portion of the cutting or scoring member is attached to a distal portion of the catheter shaft when the cutting or scoring member is in the first position;
inflating the balloon within the body lumen while the cutting or scoring member is in the first position; and
inflating the balloon while the cutting or scoring member is in the second position to dilate the body lumen without cutting or scoring obstructive matter in the body lumen.
17. The method of claim 16 , wherein the cutting or scoring member forms loops or convolutions around the balloon when the cutting or scoring member is in the first position.
18. The method of claim 16 , wherein the distal portion of the cutting or scoring member is attached to the distal portion of the catheter shaft by a releasable attachment when the cutting or scoring member is in the first position, the method further comprising:
deflating the balloon;
releasing the releasable attachment of the distal portion of the cutting or scoring member from the distal portion of the catheter shaft;
positioning the cutting or scoring member in the second position by at least proximally withdrawing the cutting or scoring member into a lumen of the catheter shaft.
19. The method of claim 16 , wherein the cutting or scoring member is configured to assume a substantially linear configuration when the cutting or scoring member is in the second position.
20. The method of claim 16 , wherein the catheter shaft includes an outer wall that defines an opening proximal to the balloon, and wherein positioning the cutting or scoring member in the second position comprises proximally withdrawing the cutting or scoring member through the opening and into the lumen of the catheter shaft.