| 摘要 |
<p>An improved method and application of laser drilling of narrow holes (14) through solid, e.g. metallic, ceramic or thermoplastic objects (2, 20), comprises the step of sluicing or flushing the back of said object during the drilling operation with a backing fluid under pressure (15, 17), preferably pure water or a pure inert gas. In laser drilling of narrow holes (14) through the wall of tubular objects (20), said backing fluid is passed through said tubular object during the drilling operation. A particularly advantageous application of the invention is the manufacture of narrow holes (14) through small-diameter, thin-walled injection needles (20) for medical use, such needles having typically a wall thickness of 0.1 mm, perforated by a number of holes (14) of 0.05 mm diameter or less.</p> |
