Atherectomy devices and methods

Abstract

The devices and methods generally relate to treatment of occluded body lumens. In particular, the present devices and method relate to removal of the occluding material from the blood vessels as well as other body lumens.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation in part of U.S. application Ser. No. 11 / 567,715, entitled “Atherectomy Devices and Methods” filed Dec. 6, 2006 which is a continuation of U.S. application Ser. No. 11 / 551,191 entitled “Atherectomy Devices and Methods” filed Oct. 19, 2006 which is a non-provisional of U.S. Provisional Application Ser. No. 60 / 806,417 entitled “Atherectomy Device” filed Jun. 30, 2006 and is a non-provisional of U.S. Provisional Application Ser. No. 60 / 820,475 entitled “Atherectomy Device” filed Jul. 26, 2006, the entirety of each of which are hereby incorporated reference.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The devices and methods described below generally relate to treatment of occluded body lumens. In particular, the present devices and method relate to removal of the occluding material from the blood vessels as well as other body lumens. [0004] 2. Description of the Background Art [0005]...

AI Technical Summary

Benefits of technology

[0015] Devices of the present invention can also include multiple cutting surfaces. For example, the multiple cutting surfaces may cut tangential to a rotational direction of a cutting head, in a forward direction as the cutting assembly moves distally, and / or in a rearward direction as the cutting assembly is withdrawn proximally. The multiple cutting surfaces can be located on a single cutting head, or may be located on a housing of the cutting assembly. In certain variations of the device, a housing of the cutting assembly may be fully open at a distal end to expose a cutting head. Such a design can incorporate additional safety features to prevent excessive damage to vessel walls.

[0018] The deflecting member can also include a pre-shaped mandrel, or tube where such features are slidable within or relative to the device to produce movement of the cutting head relative to an axis of the device. The devices described herein may have any number of features that allow for locking the device after it is articulated. This feature provides a consistent diameter when sweeping or navigating through the anatomy.

[0020] The devices described herein may have a cutter assembly having a portion of its housing having a curved surface and where the opening forms a plane across the curved surface such that as the cutting surface rotates across the opening, a portion of the cutting surface extends out of the housing through the opening. The cutter assembly may also have various other features as described below that improve the safety of the device as it is articulated while cutting. Furthermore the cutter may have a number of features to impel or drive cut tissue into the cutter assembly for eventual removal by one or more conveying members.

[0024] In such a case, placement of the straight distal portion over the catheter allows for manipulation of the degree of curvature of the catheter. This feature allows for steering of the device.

Problems solved by technology

Often plaque is friable and may dislodge naturally or during an endovascular procedure, leading to embolization of a downstream vessel.

Balloon angioplasty is known to cause barotrauma to the vessel from the high pressures required to compress the plaque.

This trauma leads to an unacceptably high rate of restenosis.

Further, this procedure may not be efficient for treatment of elastic-type plaque tissue, where such tissue can spring back to occlude the lumen.

On their own, stents fail to perform well in the peripheral vasculature for a variety of reasons.

A stent with the necessary structural integrity to supply sufficient radial force to reopen the artery often does not perform well in the harsh mechanical environment of the peripheral vasculature.

Such an environment may lead to stent failure (strut cracking, stent crushing, etc.) that eventually compromises the ability of the stent to maintain lumen diameter over the long-term.

On the other hand, a stent that is able to withstand the harsh mechanical aspects of the periphery often will not supply enough radial force to open the vessel satisfactorily.

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