Incisor-dilator with tapered balloon
First Claim
1. A device for incising and dilating stenotic tissue within a lumen of a vessel, the device comprising:
- a catheter having a distal end;
a probe mounted on the catheter proximate the distal end, the probe having a distal portion which includes a tapered section having a proximally increasing cross-section;
at least three blades moveable between a first configuration where the blades are retracted into the probe and a second configuration where the blades extend along the tapered section of the probe for incising the stenotic tissue and wherein a distal end of at least one of the blades is pivotably attached to the probe; and
an inflatable balloon for dilating the stenotic tissue, the balloon being mounted proximally to the probe.
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Accused Products
Abstract
The present invention is a device for incision and dilation of stenotic segments within the vascular system of a patient. Structurally, the present invention includes a rigid ellipsoidal dilation probe mounted at the distal end of a catheter. A series of longitudinally oriented blades project radially from the surface of the probe. A tapered inflatable balloon is also mounted on the catheter in a position that is proximal to the dilation probe. In use, the probe and catheter are advanced over a guidewire to reach the targeted stenotic segment. The probe and blades are then advanced through the stenotic segment to incise the stenosis. The balloon may then be inflated to adopt a tapering fusiform shape, allowing the balloon to be advanced through the stenosis to further dilate the stenosis. Alternatively, the balloon may be positioned across the stenosis and inflated to dilate the stenosis. The fusiform shape of the balloon matches the tapering geometry of many coronary arterial vessels, decreasing the chances that a segment of the vessel will be overpressurized by the inflating balloon.
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Citations
18 Claims
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1. A device for incising and dilating stenotic tissue within a lumen of a vessel, the device comprising:
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a catheter having a distal end;
a probe mounted on the catheter proximate the distal end, the probe having a distal portion which includes a tapered section having a proximally increasing cross-section;
at least three blades moveable between a first configuration where the blades are retracted into the probe and a second configuration where the blades extend along the tapered section of the probe for incising the stenotic tissue and wherein a distal end of at least one of the blades is pivotably attached to the probe; and
an inflatable balloon for dilating the stenotic tissue, the balloon being mounted proximally to the probe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device for incising and dilating stenotic tissue within a lumen of a vessel, the device comprising:
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a catheter;
a probe secured to the catheter, the probe having a distal portion, the distal portion including a tapered section having a proximally increasing cross-section; and
a blade including a distal end which is pivotably attached to the probe and extends through the tapered section of the probe for incising the stenotic tissue. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for incising, and dilating a stenotic tissue within a lumen of a vessel, the method comprising the steps of:
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providing a device which includes (i) a catheter having a distal end, (ii) a substantially rigid probe having a distal portion which includes a tapered section having a proximally increasing cross-section, (iii) at least three blades being adapted for selectively extending from the tapered section, the blades being moveable between a first configuration where the blades are retracted into the probe and a second configuration where the blades extend along the tapered section of the probe for incising the stenotic tissue and wherein a distal end of at least one of the blades ls pivotably attached to the probe, and (iv) an inflatable balloon for dilating the stenotic tissue, the balloon being mounted on the catheter proximally to the probe;
advancing the device through the vessel to position the distal end of the device proximate the stenotic tissue;
extending the at least three blades at least partly from the probe from the first configuration toward the second configuration;
advancing the probe through the stenotic tissue to incise the stenotic tissue; and
inflating the balloon to dilate the stenotic tissue. - View Dependent Claims (18)
providing a guidewire;
positioning the guidewire in the vessel; and
advancing the device over the guidewire.
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Specification