Cutting and coring atherectomy device and method
View Patent ↗The invention provides a rotational and/or axially translatable atherectomy system, device and method having a flexible, elongated drive shaft or catheter having an expandable and collapsible conical coil with a cutting edge on the coil's large diameter proximal end. When retracted, the coil's sections are collapsed around each other, held together in the retracted position by a sheath that, when distally retracted, allows the coil to automatically expand. The coil is expanded at a point distal to the occlusion, then pulled proximally to cut the occluding material near the lumen wall. The proximal pulling force may be combined with low-speed rotation and/or translation and/or axial vibration at low to ultrasonic frequency.
1. An atherectomy device for grinding and/or cutting and coring occluding material within a lumen having at least one diameter, comprising:
a flexible elongated, rotatable shaft having an outer diameter less than the lumen and advanceable therethrough, the flexible shaft comprising a proximal end and a distal end,
a cutting element attached proximate the distal end and capable of a retracted position having an outer diameter and a plurality of radially outwardly biased cone-shaped expanded positions having a plurality of outer diameters, each outer diameter matching the lumen's at least one diameter, the cutting element comprising a longitudinal axis, more than one coil section in expandable and retractable operative attachment, a large proximal diameter portion having an outer edge and a small distal diameter portion, cutting blades on the large proximal diameter portion, wherein the cutting blades face proximally and wherein the small distal diameter portion is located distal to the large proximal diameter portion and the cutting blades, and at least one aperture through the more than one coil section, wherein the retracted cutting element comprises an outer diameter, and
a sheath slidably and operatively connected with the flexible shaft, the shaft having a lumen therethough, the shaft lumen having an inner diameter that is larger than the outer diameter of the retracted cutting element, the retracted cutting element held within the shaft lumen.
2. The atherectomy device of claim 1 , the cutting blades forming an acute angle with the cutting element's longitudinal axis.
3. The atherectomy device of claim 1 , further comprising an outer ring around the large proximal diameter portion of the cutting element.
4. The atherectomy device of claim 1 , further comprising a piezo transducer in operative communication with the cutting element.
5. The atherectomy device of claim 4 , further comprising an ultrasonic generator in operative communication with the piezo transducer.
6. The atherectomy device of claim 1 , the cutting element further comprising an abrasive outer surface.
7. The atherectomy device of claim 1 , further comprising a sheath actuator.
8. The atherectomy device of claim 1 , further comprising the cutting blades being inwardly offset from the outer edge of the large diameter portion of the cutting element.
9. The atherectomy device of claim 1 , further comprising a distal protective device to capture freed occluding material.
10. The atherectomy device of claim 1 , further comprising an outer ring attached around the outer edge of the large proximal diameter portion of the cutting element.
11. The atherectomy device of claim 10 , further comprising the cutting blades being inwardly offset from the outer edge of the large diameter portion of the cutting element.
12. The atherectomy device of claim 1 , further comprising a piezo transducer in operative communication with the cutting element.
13. The atherectomy device of claim 12 , further comprising an ultrasonic generator in operative communication with the piezo transducer.
14. The atherectomy device of claim 1 , the cutting element further comprising an abrasive outer surface.
15. The atherectomy device of claim 1 , further comprising a sheath actuator.
16. The atherectomy device of claim 1 , further comprising a distal protective device to capture freed occluding material.