Atherectomy devices and methods
First Claim
Patent Images
1. A system for performing rotational atherectomy to remove stenotic lesion material from a blood vessel of a patient, the system comprising:
- an elongate flush tube defining a first lumen and a second lumen; and
a rotational atherectomy device comprising;
an elongate flexible drive shaft comprising helically wound metallic filars that form a coil having a constant outer diameter, the drive shaft defining a longitudinal axis, the drive shaft configured for rotation about the longitudinal axis, the drive shaft configured to be at least partially disposed within the second lumen when the system is used for performing the rotational atherectomy;
an array of at least three spherical abrasive elements positioned adjacent to one another along the coil, the spherical abrasive elements being fixed to the drive shaft such that a center of mass of each abrasive element is offset from the longitudinal axis, each abrasive elements being spaced apart from an adjacent abrasive element by an element spacing distance; and
a metallic stability element having a cylindrical shape defining an inner diameter, the metallic stability element being fixed along the inner diameter to the helically wound metallic filars of the drive shaft, the metallic stability element having a center of mass aligned with the longitudinal axis, the stability element being distally spaced apart from a distal-most abrasive element of the spherical abrasive elements by a distal separation distance, the distal separation distance being greater than the element spacing distance;
wherein the drive shaft includes a distal extension portion extending distally beyond a distal end of the metallic stability element; and
wherein the drive shaft, the abrasive elements, and the metallic stability element rotate together about the longitudinal axis.
1 Assignment
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Accused Products
Abstract
This document describes rotational atherectomy devices and systems for removing or reducing stenotic lesions in blood vessels by rotating an abrasive element within the vessel to partially or completely remove the stenotic lesion material.
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Citations
15 Claims
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1. A system for performing rotational atherectomy to remove stenotic lesion material from a blood vessel of a patient, the system comprising:
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an elongate flush tube defining a first lumen and a second lumen; and a rotational atherectomy device comprising; an elongate flexible drive shaft comprising helically wound metallic filars that form a coil having a constant outer diameter, the drive shaft defining a longitudinal axis, the drive shaft configured for rotation about the longitudinal axis, the drive shaft configured to be at least partially disposed within the second lumen when the system is used for performing the rotational atherectomy; an array of at least three spherical abrasive elements positioned adjacent to one another along the coil, the spherical abrasive elements being fixed to the drive shaft such that a center of mass of each abrasive element is offset from the longitudinal axis, each abrasive elements being spaced apart from an adjacent abrasive element by an element spacing distance; and a metallic stability element having a cylindrical shape defining an inner diameter, the metallic stability element being fixed along the inner diameter to the helically wound metallic filars of the drive shaft, the metallic stability element having a center of mass aligned with the longitudinal axis, the stability element being distally spaced apart from a distal-most abrasive element of the spherical abrasive elements by a distal separation distance, the distal separation distance being greater than the element spacing distance; wherein the drive shaft includes a distal extension portion extending distally beyond a distal end of the metallic stability element; and wherein the drive shaft, the abrasive elements, and the metallic stability element rotate together about the longitudinal axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification