Atherectomy catheters devices having multi-channel bushings
First Claim
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1. An atherectomy catheter device having a multi-channeled bushing, the device comprising:
- an elongate body;
a tip extending from a distal end of the elongate body;
a drive shaft extending within the elongate body;
a bushing comprisinga bushing body,a hinge point on a side of the bushing body,a first channel extending proximally to distally through the bushing body,a second channel extending proximally to distally through the bushing body, overlapping with the first channel and having a diameter of the second channel that is less than a diameter of the first channel, and wherein the second channel is angled between 1° and
45°
relative to the first channel,a first opening at a distal end of the bushing body into the first channel, anda second opening at the distal end of the bushing body into the second channel, wherein the first and second openings overlap; and
a cutter having a distal cutting head with a cutting edge, an elongate cylindrical body, and a neck region extending between the distal cutting edge and the elongate cylindrical body, wherein the drive shaft is coupled to the elongate cylindrical body;
further wherein distal movement of the drive shaft extends the cylindrical body of the cutter within the first channel of the bushing and drives the tip about the hinge point to axially align the tip with the elongate body and at least partially cover the cutting edge, while proximal movement of the drive shaft extends the neck region of the cutter within the second channel of the bushing and drives the tip about the hinge point to angle the tip relative to the elongate body and at least partially expose the cutting edge.
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Abstract
Atherectomy catheters and methods of using them are described herein. In particular, described herein are optical coherence tomography (OCT) catheters that may include a distal tip that can be deflected away from the long axis of the device using a multi-channel bushing. The bushing may include at a hinge point that is offset (e.g., located on a side of the elongate body near the distal end of the elongate body) and a rotatable cutter near an imaging assembly that can be driven against the wall with a high mechanical advantage.
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Citations
20 Claims
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1. An atherectomy catheter device having a multi-channeled bushing, the device comprising:
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an elongate body; a tip extending from a distal end of the elongate body; a drive shaft extending within the elongate body; a bushing comprising a bushing body, a hinge point on a side of the bushing body, a first channel extending proximally to distally through the bushing body, a second channel extending proximally to distally through the bushing body, overlapping with the first channel and having a diameter of the second channel that is less than a diameter of the first channel, and wherein the second channel is angled between 1° and
45°
relative to the first channel,a first opening at a distal end of the bushing body into the first channel, and a second opening at the distal end of the bushing body into the second channel, wherein the first and second openings overlap; and a cutter having a distal cutting head with a cutting edge, an elongate cylindrical body, and a neck region extending between the distal cutting edge and the elongate cylindrical body, wherein the drive shaft is coupled to the elongate cylindrical body; further wherein distal movement of the drive shaft extends the cylindrical body of the cutter within the first channel of the bushing and drives the tip about the hinge point to axially align the tip with the elongate body and at least partially cover the cutting edge, while proximal movement of the drive shaft extends the neck region of the cutter within the second channel of the bushing and drives the tip about the hinge point to angle the tip relative to the elongate body and at least partially expose the cutting edge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An atherectomy catheter device having a multi-channeled bushing, the device comprising:
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an elongate body; a tip extending from a distal end of the elongate body; a drive shaft extending within the elongate body; a bushing comprising a bushing body, a pair of hinge points on either side of the bushing body that are offset from a midline along a distal-to-proximal axis of the bushing body, an inner flange positioned distal to the hinge points a first channel extending proximally to distally through the bushing body, a second channel extending proximally to distally through the bushing body and having a diameter along a length of the second channel that is less than a diameter along a length of the first channel, and wherein the first and the second channels overlap, and wherein the second channel is angled between 1° and
45°
relative to the first channel,a first opening at a distal end of the bushing body into the first channel, and a second opening at a distal end of the bushing body into the second channel, wherein the first and second openings overlap, and an outer flange portion distal to the inner flange portion; a cutter having a distal cutting head with a cutting edge, an elongate cylindrical body, and a neck region extending between the distal cutting edge and the elongate cylindrical body, wherein the drive shaft is coupled to the elongate cylindrical body; and further wherein distal movement of the drive shaft extends the cylindrical body of the cutter within the first channel of the bushing, drives the neck region against the inner flange portion and drives the tip about the hinge points to axially align the tip with the elongate body at least partially covering the cutting edge, while proximal movement of the drive shaft extends the neck region of the cutter within the second channel of the bushing, drives the distal cutting head against the outer flange portion, and drives the tip about the hinge points to angle the tip relative to the elongate body and at least partially expose the cutting edge. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. An atherectomy catheter device having a multi-channeled bushing, the device comprising:
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an elongate body; a hollow distal tip extending from a distal end of the elongate body; a drive shaft extending within the elongate body; a bushing comprising a bushing body, a pair of hinge points on either side of the bushing body that are offset from a midline along a distal-to-proximal axis of the bushing body, an inner flange positioned distal to the hinge points a first channel extending proximally to distally through the bushing body, a second channel extending proximally to distally through the bushing body and having a diameter along a length of the second channel that is less than a diameter along a length of the first channel, and wherein the first and the second channels overlap, and wherein the second channel is angled between 1° and
45°
relative to the first channel,a first opening at a distal end of the bushing body into the first channel, and a second opening at a distal end of the bushing body into the second channel, wherein the first and second openings overlap, and an outer flange portion distal to the inner flange portion; and a cutter having a distal cutting head with a cutting edge, an elongate cylindrical body, and a neck region extending between the distal cutting edge and the elongate cylindrical body, wherein the drive shaft is coupled to the elongate cylindrical body; further wherein distal movement of the drive shaft extends the cylindrical body of the cutter within the first channel of the bushing and drives the hollow distal tip about the hinge points to axially align the hollow distal tip with the elongate body at least partially covering the cutting edge, while proximal movement of the drive shaft extends the neck region of the cutter within the second channel of the bushing and drives the hollow distal tip about the hinge points to angle the hollow distal tip relative to the elongate body and at least partially expose the cutting edge.
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Specification