Rotational atherectomy device
First Claim
1. A method of manufacturing a drive shaft having an enlarged diameter tissue removal section comprising the steps of:
- helically winding one or more strands of wire about an elongated mandrel having an enlarged diameter portion with a predetermined shape, thereby forming an elongated, flexible drive shaft which has an enlarged diameter tissue removal section defined by wire turns of the drive shaft; and
immersing at least the enlarged diameter tissue removal section of the drive shaft into an acidic solution to dissolve at least the enlarged diameter portion of the mandrel from within the drive shaft.
3 Assignments
0 Petitions
Accused Products
Abstract
An atherectomy device for removing tissue from an artery. The device includes a flexible, elongated drive shaft rotatable about a guide wire, the drive shaft having an enlarged diameter tissue removal section. The drive shaft and the enlarged diameter tissue removal section are comprised of helically wound wire. Wire turns of the proximal portion of the tissue removal section have diameters that gradually increase distally at a generally constant rate thereby forming generally the shape of a cone. Wire turns of the distal portion of the enlarged diameter tissue removal section have diameters that gradually decrease distally thereby forming a generally convex distal portion. At least part of the tissue removal section includes an external coating of an abrasive material to define an abrasive segment of the drive shaft. The drive shaft may include a reduced diameter segment located near the enlarged diameter tissue removal section to facilitate smooth rotation of the drive shaft and its tissue removal section about the guide wire when the atherectomy device is rotated at high speeds. Preferably such a reduced diameter segment is provided just proximal to the enlarged diameter tissue removal section, and preferably the entire portion of the drive shaft distal to the enlarged diameter tissue removal section also has a similarly reduced diameter. The maximum outer diameter and length of the abrasive segment may be selected so that, at operational rotational speeds and under load, at least some of the wire turns of the proximal portion of the enlarged diameter tissue removal section unwind from their at-rest diameter to an effective outer diameter which is the same as or larger than the maximum outer diameter of the abrasive segment.
95 Citations
29 Claims
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1. A method of manufacturing a drive shaft having an enlarged diameter tissue removal section comprising the steps of:
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helically winding one or more strands of wire about an elongated mandrel having an enlarged diameter portion with a predetermined shape, thereby forming an elongated, flexible drive shaft which has an enlarged diameter tissue removal section defined by wire turns of the drive shaft; and
immersing at least the enlarged diameter tissue removal section of the drive shaft into an acidic solution to dissolve at least the enlarged diameter portion of the mandrel from within the drive shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of manufacturing a drive shaft having an enlarged diameter tissue removal section comprising the steps of:
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preparing an elongated mandrel by securing an enlarged diameter portion to an elongated mandrel shaft which has a generally constant diameter along its length, the enlarged diameter portion of the mandrel being made from a material that is dissolvable in nitric acid;
helically winding about the elongated mandrel one or more strands of wire made from a material that does not readily dissolve in nitric acid, thereby forming an elongated, flexible drive shaft which has an enlarged diameter tissue removal section defined by wire turns of the drive shaft; and
immersing at least the enlarged diameter tissue removal section of the drive shaft into an acidic solution to dissolve at least the enlarged diameter portion of the mandrel from within the drive shaft. - View Dependent Claims (10, 11, 12)
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13. A method of manufacturing an atherectomy device comprising the steps of:
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providing a mandrel having an elongated shaft with a generally constant diameter along its length except for an enlarged diameter portion, the enlarged diameter portion having proximal and distal sections, the proximal section having an outer surface generally in the shape of a cone extending for an entire length or nearly the entire length of the proximal section;
helically winding one or more strands of wire about the mandrel, including the enlarged diameter portion of the mandrel, to form an elongated, flexible drive shaft which has an enlarged diameter tissue removal section with a generally conical proximal portion; and
removing the mandrel from the drive shaft. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for manufacturing an atherectomy device, the method comprising the steps of:
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providing a mandrel having an elongated mandrel shaft;
mounting an enlarged diameter portion at a predetermined location on the mandrel shaft, the enlarged diameter portion having an enlarged diameter relative to a diameter of the mandrel shaft, and having a section with a conical shape;
helically winding one or more wires about the mandrel, including the enlarged diameter portion of the mandrel, to form an elongated, flexible drive shaft which has an enlarged tissue removal section with a generally conical portion; and
removing the mandrel from the drive shaft. - View Dependent Claims (24, 25)
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26. A method of manufacturing a drive shaft having an enlarged diameter tissue removal section comprising the steps of:
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providing an elongated mandrel having an enlarged diameter portion with a predetermined shape having asymmetrical proximal and distal portions which are asymmetrical relative to each other;
helically winding one or more strands of wire about the elongated mandrel thereby forming an elongated, flexible drive shaft which has an enlarged diameter tissue removal section defined by wire turns of the drive shaft; and
immersing at least the enlarged diameter tissue removal section of the drive shaft into an acidic solution to dissolve at least the enlarged diameter portion of the mandrel from within the drive shaft. - View Dependent Claims (27)
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28. A method of manufacturing a drive shaft having an enlarged diameter tissue removal section comprising the steps of:
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preparing an elongated mandrel by securing an enlarged diameter portion to an elongated mandrel shaft which has a generally constant diameter along its length, the enlarged diameter portion having proximal and distal portions which are asymmetric relative to each other, and the enlarged diameter portion of the mandrel being made from a material that is dissolvable in nitric acid;
helically winding about the elongated mandrel one or more strands of wire made from a material that does not readily dissolve in nitric acid, thereby forming an elongated, flexible drive shaft which has an enlarged diameter tissue removal section defined by wire turns of the drive shaft; and
immersing at least the enlarged diameter tissue removal section of the drive shaft into an acidic solution to dissolve at least the enlarged diameter portion of the mandrel from within the drive shaft. - View Dependent Claims (29)
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Specification