Abrasive drive shaft device for rotational atherectomy
First Claim
1. An abrasive drive shaft atherectomy device comprising a flexible, elongated drive shaft having a central lumen for receipt of a guide wire therein around which the drive shaft may be rotated, the drive shaft being comprised of at least one helically wound wire and having proximal, intermediate and distal segments, wire turns of the proximal segment of the drive shaft having a generally constant diameter, turns of the intermediate segment of the drive shaft having a diameter that progressively increases distally through a proximal portion of such intermediate segment and having a diameter that progressively decreases distally through a distal portion of such intermediate segment, thereby defining an enlarged diameter segment of the drive shaft, at least part of the enlarged diameter intermediate segment including an external coating of an abrasive material to define an abrasive segment of the drive shaft, the intermediate segment of the drive shaft including a gap between adjacent wire turns to define a sonolucent window in the intermediate segment.
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Accused Products
Abstract
An abrasive drive shaft atherectomy device for removing stenotic tissue from an artery. The device includes a flexible, elongated drive shaft having a central lumen for receipt of a guide wire therein and around which the drive shaft may be rotated. The drive shaft is made from one or more helically wound wires. Wire turns of the proximal segment of the drive shaft have a generally constant diameter. Wire turns of a segment of the drive shaft near its distal end have an enlarged diameter. At least part of the enlarged diameter segment includes an external coating of an abrasive material to define an abrasive segment of the drive shaft which, when rotated at high speeds, is usable to remove stenotic tissue from an artery. In a preferred embodiment, the device includes a bushing disposed in the enlarged diameter segment for supporting the enlarged diameter turns of the drive shaft. A gap may be provided in the turns of the drive shaft to permit imaging therethrough by an ultrasound imaging device disposed in the central lumen of the drive shaft. Preferably the drive shaft is made from inner and outer coaxial wire layers helically wound in opposite directions so that the outer layer tends to radially contract and the inner layer tends to radially expand when the drive shaft is rotated in a predetermined direction. In one such embodiment, a toroidal collar is positioned between the inner and outer layers of the enlarged diameter abrasive segment of the drive shaft.
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Citations
114 Claims
- 1. An abrasive drive shaft atherectomy device comprising a flexible, elongated drive shaft having a central lumen for receipt of a guide wire therein around which the drive shaft may be rotated, the drive shaft being comprised of at least one helically wound wire and having proximal, intermediate and distal segments, wire turns of the proximal segment of the drive shaft having a generally constant diameter, turns of the intermediate segment of the drive shaft having a diameter that progressively increases distally through a proximal portion of such intermediate segment and having a diameter that progressively decreases distally through a distal portion of such intermediate segment, thereby defining an enlarged diameter segment of the drive shaft, at least part of the enlarged diameter intermediate segment including an external coating of an abrasive material to define an abrasive segment of the drive shaft, the intermediate segment of the drive shaft including a gap between adjacent wire turns to define a sonolucent window in the intermediate segment.
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47. An abrasive drive shaft atherectomy device comprising a flexible, elongated drive shaft having a central lumen for receipt of a guide wire therein around which the drive shaft may be rotated, the drive shaft being comprised of at least one helically wound wire and having proximal, intermediate and distal segments, wire turns of the proximal segment of the drive shaft having a generally constant diameter, turns of the intermediate segment of the drive shaft having a diameter that progressively increases distally through a proximal portion of such intermediate segment and having a diameter that progressively decreases distally through a distal portion of such intermediate segment to a diameter not larger than the diameter of the proximally segment of the drive shaft, thereby defining an enlarged diameter segment of the drive shaft, at least part of the enlarged diameter intermediate segment including an external coating of diamond chips secured directly to the drive shaft wire by a bonding material to define an abrasive segment of the drive shaft, the coating of diamond chips being of a generally uniform thickness throughout the length of the abrasive segment and the thickness of the bonding material between substantially all of the diamond chips and the drive shaft being not more than about 15 μ
- m, the atherectomy device further including a bushing disposed within the intermediate segment of the drive shaft, the bushing having an outer surface engaging and supporting the wire turns of at least the central portion of the intermediate segment, the bushing having an inner longitudinal bore therethrough which is generally coaxial with the drive shaft lumen, the bushing bore having a low friction inner surface and being sized to receive the guide wire therein.
- View Dependent Claims (48)
- 49. An abrasive drive shaft atherectomy device comprising a flexible, elongated drive shaft having a central lumen for receipt of a guide wire therein around which the drive shaft may be rotated, the drive shaft being comprised of at least one helically wound wire and having proximal, intermediate and distal segments, wire turns of the proximal segment of the drive shaft having a generally constant diameter, turns of the intermediate segment of the drive shaft having a diameter that progressively increases distally through a proximal portion of such intermediate segment and having a diameter that progressively decreases distally through a distal portion of such intermediate segment, thereby defining an enlarged diameter segment of the drive shaft, at least part of the enlarged diameter intermediate segment including an external coating of an abrasive material to define an abrasive segment of the drive shaft, the device further including a bushing disposed within the intermediate segment of the drive shaft, the bushing having an outer surface engaging and supporting the wire turns of at least a central portion of the intermediate segment, and having an inner longitudinal bore therethrough, the bore being generally coaxial with the drive shaft lumen.
- 90. An abrasive drive shaft atherectomy device comprising a flexible, elongated drive shaft having a central lumen for receipt of a guide wire therein around which the drive shaft may be rotated, the drive shaft being comprised of inner and outer co-axial wire layers helically wound in opposite directions so that the outer layer tends to radially contract and the inner layer tends to radially expand when the rive shaft is rotated in a predetermined direction, the drive shaft having proximal, intermediate and distal segments, wire turns of the proximal segment of the drive shaft having a generally constant diameter, wire turns of the outer layer of the intermediate segment of the drive shaft having a diameter that progressively increases distally through a proximal portion of such intermediate segment and having a diameter that progressively decreases distally through a distal portion of such intermediate segment, thereby defining an enlarged diameter segment of the drive shaft, at least part of the enlarged diameter intermediate segment including an external coating of an abrasive material to define an abrasive segment of the drive shaft, and further including a generally toroidal collar positioned in the intermediate segment of the drive shaft between the inner and outer layers of the drive shaft.
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111. The abrasive drive shaft atherectomy device comprising a flexible, elongated drive shaft having a central lumen for receipt of a guide wire therein around which the drive shaft may be rotated, the drive shaft being comprised of at least two helically wound wires forming inner and outer co-axial wire layers helically wound in opposite directions so that the outer layer tends to radially contract and the inner layer tends to radially expand when the drive shaft is rotated in a predetermined direction;
- and drive shaft having proximal, intermediate and distal segments, wire turns of the proximal segment of the drive shaft having a generally constant diameter, wire turns of the intermediate segment of the drive shaft having a diameter that progressively increases distally through a proximal portion of such intermediate segment and having a diameter that progressively decreases distally through a distal portion of such intermediate segment, thereby defining an enlarged diameter segment of the drive shaft, at least part of the enlarged diameter intermediate segment including an external coating of an abrasive material to define an abrasive segment of the drive shaft.
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112. The abrasive drive shaft atherectomy device comprising a flexible, elongated drive shaft having a central lumen for receipt of a guide wire therein around which the drive shaft may be rotated, the drive shaft being comprised of at least two helically wound wires forming inner and outer co-axial wire layer helically wound in opposite directions so that the outer layer tends to radially contract and the inner layer tends to radially expand when the drive shaft is rotated in a predetermined direction, the drive shaft having proximal, intermediate and distal segments;
- the outer wire layer extending along substantially the entire proximal segment of the drive shaft, terminating just proximal to the intermediate segment of the drive shaft and having a generally constant diameter;
wire turns of the inner layer of the drive shaft extending along substantially the entire length of the drive shaft, such wire turns having a generally constant diameter along substantially the entire proximal segment of the drive shaft, having a diameter that progressively increases distally through a proximal portion of the intermediate segment, and having a diameter that progressively decreases distally through a distal portion of the intermediate segment, thereby defining an enlarged diameter segment of the drive shaft, at least part of the enlarged diameter intermediate segment including an external coating of an abrasive material to define an abrasive segment of the drive shaft.
- the outer wire layer extending along substantially the entire proximal segment of the drive shaft, terminating just proximal to the intermediate segment of the drive shaft and having a generally constant diameter;
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113. An abrasive drive shaft atherectomy device comprising a flexible, elongated drive shaft having a central lumen for receipt of a guide wire therein around which the drive shaft may be rotated, the drive shaft being comprised of at least two helically wound wires forming inner and outer co-axial wire layers helically wound in opposite directions so that the outer layer tends to radially contract and the inner layer tends to radially expand when the drive shaft is rotated in a predetermined direction, the drive shaft having proximal, intermediate and distal segments;
- the inner wire layer extending along substantially the entire length of the drive shaft and having a generally constant diameter;
wire turns of the outer layer of the dive shaft extending along substantially all of the proximal and intermediate segments and at least partially along the distal segment of the drive shaft;
such wire turns of the outer layer having a diameter that is substantially constant along substantially the entire proximal segment of the drive shaft, that progressively increases distally through a proximal portion of the intermediate segment, and that progressively decreases distally through a distal portion of the intermediate segment, thereby defining an enlarged diameter segment of the drive shaft, at least part of the enlarged diameter intermediate segment including an external coating of an abrasive material to define an abrasive segment of the drive shaft. - View Dependent Claims (114)
- the inner wire layer extending along substantially the entire length of the drive shaft and having a generally constant diameter;
Specification