Laser stent cutting
View Patent ↗A stent may be manufactured by providing a tube having a longitudinal axis therethrough, providing a stationary source of laser radiation, generating a beam of laser radiation using the source of laser radiation, and cutting a desired pattern into the tube by scanning the beam over a desired region of the tube.
1. A method of manufacturing a medical device from a workpiece, comprising:
generating a beam of radiation from a radiation source; and
directing the radiation beam onto the workpiece by scanning the radiation beam with a scanning galvanometer to redirect the radiation beam in a desired manner within a planar scan area so that a prescribed pattern is cut in the workpiece, wherein a conical mirror is positioned along an optical path between the radiation source and the workpiece, the conical mirror having an apex with an aperture through which the workpiece passes.
2. The method of claim 1 wherein the radiation beam is scanned within the planar scan area throughout which the beam is incident at a 90° angle.
3. The method of claim 1 wherein the workpiece is a tubular workpiece.
4. The method of claim 3 wherein the planar scan area is perpendicular to a longitudinal axis of the tubular workpiece.
5. The method of claim 1 wherein the scanning galvanometer comprises a first pivotable scanning mirror pivotable about a first axis and a second pivotable scanning mirror pivotable about a second axis, wherein the first and second axes are orthogonal to one another.
6. The method of claim 1 further comprising the step of positioning at least one optical element along an optical path between the radiation source and the workpiece.
7. The method of claim 6 wherein the optical element comprises a flat field telecentric lens.
8. The method of claim 1 wherein the directing step includes the step of focusing the beam in a flat focal plane prior to impinging on the workpiece.
9. The method of claim 1 wherein the workpiece comprises a biocompatible material.
10. The method of claim 9 wherein said biocompatible material is stainless steel.
11. The method of claim 1 wherein the medical device is a stent.
12. The method of claim 1 wherein the medical device is a catheter.
13. The method of claim 1 wherein the workpiece is translated along its longitudinal axis during the step of directing the radiation beam.
14. The method of claim 3 wherein the tubular workpiece is rotated about its longitudinal axis during the step of directing the radiation beam.
15. The method of claim 1 wherein the radiation beam is a laser beam.
16. The method of claim 15 wherein the laser beam is a pulsed laser beam.
17. The method of claim 1 wherein the workpiece is cut by scanning the radiation over a common path a plurality of times, wherein each subsequent scan over the common path removes additional material from the workpiece.