| 摘要 |
<p>This invention is an elongated hollow spinal needle (30) that is less prone to causing post-dural puncture headache by having a modified pencil-like point (34) with a rounded shoulder (38) at the juncture between the modified pencil-like point and the body (32) of the spinal needle. A side port (40) is formed in the hollow needle at a position adjacent the rounded shoulder. The leading edge of the side port is located not more than 1.5 times the external diameter of the hollow needle from the tip (36) of the pencil-like point to reduce the bending moment between the tip and the side port. The cross-sectional area of the side port is configured to be equal to or incrementally larger than the cross-sectional area of the lumen of the hollow needle.</p> |
