| 摘要 |
A hypodermic needle (20), according to the present invention, includes a hollow shaft having a substantially cylindrical inner surface (22), and a substantially cylindrical outer surface (24). The needle includes a beveled surface (26) extending between and connecting the inner surface and the outer surface of the needle tip. A cutting edge of the needle is formed between the beveled surface (26) and the internal surface (22) of the needle. The hypodermic needle avoids trauma, tearing, and other unnecessary tissue damage during penetration of tissue, and during threading of the probe through blood vessels, tunnel incisions or cavities. An alternative embodiment of the hypodermic needle has a cutting edge which includes a rounded (40) or blunted section at a trailing portion of the cutting edge.
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