Apparatus for percutaneously performing myocardial revascularization having controlled cutting depth and methods of use
First Claim
1. Apparatus for percutaneously performing myocardial revascularization comprising:
- a first catheter adapted for insertion into the left ventricle, the first catheter having a lumen and a distal endface movable to a plurality of sites on an endocardial surface;
a stabilizer element disposed on the first catheter, the stabilizer element contacting the endocardial surface to stabilize the first catheter against the endocardial surface;
a cutting head movable from a retracted position within the lumen of the first catheter to an extended position wherein the cutting head extends beyond the distal endface of the first catheter to form a channel in cardiac tissue; and
means for limiting extension of the cutting head in the extended position.
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Accused Products
Abstract
Apparatus and methods for percutaneously performing myocardial revascularization are provided using a catheter having an end region that is directable to contact a patient'"'"'s endocardium at a plurality of positions. A cutting head is disposed within a lumen of the catheter and coupled to a drive tube that rotates and reciprocates the drive shaft. One or more stabilizing elements are disposed on the distal end to retain the catheter in position when the cutting head is actuated. The cutting head and drive tube include a lumen through which severed tissue is aspirated. Mechanisms are provided for controlling the maximum extension of the cutting head beyond a distal endface of the catheter, independent of the degree of tortuosity imposed on the catheter. Mechanisms and methods also are provided for providing the operator with information to assess the desirability of treating a proposed site.
1458 Citations
40 Claims
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1. Apparatus for percutaneously performing myocardial revascularization comprising:
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a first catheter adapted for insertion into the left ventricle, the first catheter having a lumen and a distal endface movable to a plurality of sites on an endocardial surface; a stabilizer element disposed on the first catheter, the stabilizer element contacting the endocardial surface to stabilize the first catheter against the endocardial surface; a cutting head movable from a retracted position within the lumen of the first catheter to an extended position wherein the cutting head extends beyond the distal endface of the first catheter to form a channel in cardiac tissue; and means for limiting extension of the cutting head in the extended position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of percutaneously performing revascularization of a patient'"'"'s cardiac tissue, the method comprising:
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providing a first catheter adapted for insertion into the left ventricle comprising a stabilizer element and a cutting head movable from a retracted position to an extended position; advancing a distal region of the first catheter transluminally to a position within a patient'"'"'s left ventricle; deploying the stabilizer element to stabilize the distal region of the first catheter in contact with an endocardial surface; rotating the cutting head; and advancing the cutting head from the retracted to the extended position to bore a channel into the patient'"'"'s cardiac tissue, the channel having a predetermined maximum depth substantially independent of a degree of bending imposed on the first catheter. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification