Rotational atherectomy segmented abrading head and method to improve abrading efficiency
First Claim
1. A high-speed rotational atherectomy device for opening a stenosis in an artery having a given diameter, comprising:
- a guide wire having a maximum diameter less than the diameter of the artery;
a flexible elongated, rotatable drive shaft advanceable over the guide wire, the drive shaft having a rotational axis;
an eccentric proximal segment defining a drive shaft lumen therethrough, wherein the proximal segment is mounted on the drive shaft;
at least one eccentric cylindrical segment separate from the eccentric proximal segment, the at least one eccentric cylindrical segment defining a drive shaft lumen therethrough, wherein the at least one eccentric cylindrical segment is mounted distally and separately from the proximal segment on the drive shaft, wherein the at least one eccentric cylindrical segment and the proximal segment are spaced apart along the drive shaft by a first flexibility gap;
an eccentric distal segment separate from the at least one eccentric cylindrical segment, the distal segment defining a drive shaft lumen therethrough, wherein the distal segment is mounted distally and separately from the at least one eccentric cylindrical segment on the drive shaft, wherein the at least one eccentric cylindrical segment and the distal segment are spaced apart along the drive shaft by a second flexibility gap.
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Accused Products
Abstract
The invention provides a rotational atherectomy system, device and method having, in various embodiments, a flexible, elongated, rotatable drive shaft comprising an eccentric abrading head comprising at least one eccentric abrading cylindrical segments attached to the drive shaft and in spaced proximity with proximal and a distal conical segments. Each individual abrading segment, comprises a first tissue removing surface, typically an abrasive coating on the outer surface, that is designed to abrade calcified, hard tissue and abrasive coating on the leading and trailing surfaces designed to abrade non-calcified, soft tissue. Each abrading segment, as well as the abrading head comprising the collective segments, has a center of mass spaced radially from the rotational axis of the drive shaft, facilitating the ability of the device to open the stenotic lesion to a diameter larger than the outer diameter of the enlarged abrading head when operated at high speeds.
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Citations
14 Claims
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1. A high-speed rotational atherectomy device for opening a stenosis in an artery having a given diameter, comprising:
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a guide wire having a maximum diameter less than the diameter of the artery; a flexible elongated, rotatable drive shaft advanceable over the guide wire, the drive shaft having a rotational axis; an eccentric proximal segment defining a drive shaft lumen therethrough, wherein the proximal segment is mounted on the drive shaft; at least one eccentric cylindrical segment separate from the eccentric proximal segment, the at least one eccentric cylindrical segment defining a drive shaft lumen therethrough, wherein the at least one eccentric cylindrical segment is mounted distally and separately from the proximal segment on the drive shaft, wherein the at least one eccentric cylindrical segment and the proximal segment are spaced apart along the drive shaft by a first flexibility gap; an eccentric distal segment separate from the at least one eccentric cylindrical segment, the distal segment defining a drive shaft lumen therethrough, wherein the distal segment is mounted distally and separately from the at least one eccentric cylindrical segment on the drive shaft, wherein the at least one eccentric cylindrical segment and the distal segment are spaced apart along the drive shaft by a second flexibility gap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification