Atherectomy devices and methods

• US 8,070,762 B2
• Filed: 10/22/2008
• Issued: 12/06/2011
• Est. Priority Date: 10/22/2007
• Status: Active Grant

• Current Assignee: Atheromed, Inc. (Koninklijke Philips N.V.)
• Original Assignee: Atheromed, Inc. (Koninklijke Philips N.V.)
• Inventors: To, John T, Danek, Christopher James, Escudero, Paul Q
• Primary Examiner(s): Nguyen, Tuan
• Assistant Examiner(s): Papeika, Rachel S
• Application Number:
  US12/288,593
• Publication Number:
  US 20090234378A1
• Time in Patent Office: 1,140 Days
• Field of Search: 606/108, 606/158, 606/159, 606/167, 606/171, 606/180, 606/198, 128/898
• US Class Current: 606/159
• CPC Class Codes: A61B 17/3207 Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions A61B17/32037 takes precedence; endoscopic cutting instruments A61B17/320016
• CPC Class Codes: A61B 17/320758 with a rotating cutting instrument, e.g. motor driven A61B17/320725, A61B17/32075 and A61B17/320783 take precedence; for removing intra-ocular material A61F9/00763; endoscopic rotatable cutting instruments A61B17/32002
• CPC Class Codes: A61B 17/320783 through side-hole, e.g. sliding or rotating cutter inside catheter
• CPC Class Codes: A61B 2017/00685 Archimedes screw
• CPC Class Codes: A61B 2017/22038 with a guide wire
• CPC Class Codes: A61B 2017/22047 Means for immobilising the guide wire in the patient
• CPC Class Codes: A61B 2017/22048 Balloons
• CPC Class Codes: A61B 2017/22068 Centering
• CPC Class Codes: A61B 2017/22082 after introduction of a substance
• CPC Class Codes: A61B 2017/320064 with tissue or sample retaining means
• CPC Class Codes: A61M 25/09 Guide wires

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.

Claims

1. A method for cutting and removing occlusive material from a body lumen, the method comprising:

providing a vascular device comprising

a catheter body sized and configured for axial advancement in the body lumen, the catheter body having a center axis along which axial advancement occurs and including spaced apart proximal and distal ends,

a cutter assembly having an outside diameter attached at the distal end of the catheter body, the cutter assembly comprising a housing having at least one opening, a distal cutter having at least one helical cutting edge configured to rotate about the center axis relative to the housing to cut occlusive material at the distal end of the catheter body and convey the occlusive material from the body lumen proximally into the housing, and a proximal cutter having a number of helical cutting edges greater than the at least one helical cutting edge of the distal cutter and configured to rotate about the center axis relative to the housing to further cut the occlusive material and convey the occlusive material from the body lumen more proximally into the housing,

a drive mechanism at the proximal end of the catheter body;

a torque shaft coupled to the drive mechanism and extending through the catheter body and coupled to the cutter to rotate the cutter assembly about the center axis relative to the housing,

a conveyor mechanism helically wound about the torque shaft in a direction common with the helical cutting edges of the distal and proximal cutters to convey the occlusive material conveyed into the housing by the distal and proximal cutters still further proximally along the catheter body for discharge without supplement of a vacuum pump, and

a deflecting mechanism slidable within the catheter body in response to a force applied at the proximal end of the catheter body for deflecting the cutter assembly relative to the center axis of the catheter body to point the cutter assembly toward a side of the body lumen without necessitating axial advancement of the catheter body in the body lumen,

manipulating the proximal end of the catheter body to insert the distal end of the catheter body within the body lumen,

manipulating the proximal end of the catheter body to advance the distal end of the catheter body within the body lumen toward the occlusive material,

operating the drive mechanism to rotate the cutter assembly about the central axis to cut occlusive material at the distal end of the catheter body, to convey the occlusive material from the body lumen proximally into the housing, and to convey the occlusive material conveyed into the housing by the cutter assembly further proximally along the catheter body by the conveyor mechanism for discharge without supplement of a vacuum pump,

operating the deflecting mechanism at the proximal end of the catheter body to deflect the cutter assembly relative to the center axis of the catheter body to point the cutter assembly toward a side of the body lumen without necessitating axial advancement of the catheter body in the body lumen, and

rotating the distal end of the catheter body when the cutter assembly is deflected to sweep the cutter assembly in an arc about the center axis to cut occlusive material in a region larger than the outside diameter of the cutter assembly, wherein rotating the distal end of the catheter body comprises operatring a torque control device separate from the deflecting mechanism to manually or automatically control the sweep of the cutter assembly.