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US 6,551,289 B1Granted
Outer needle of anesthetic needle assembly for epidural
AssigneeDr. Japan Co., Ltd.
InventorsAkio Higuchi, Hayato Hyugaji
Life of this patent
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Abstract
A outer needle of an anesthetic needle assembly to be injected into an epidural area, has a distal end which is cut and bent to form an annular cutting edge. The distal end is gently bent so that an anesthetic needle having a forward end can slide readily out of the annular cutting edge. The annular cutting edge has a wave-like configuration with an extended circular or rectangular annulus with round corners and outwardly expanded sides.
Claims8
An outer needle of an anesthetic needle assembly to be injected into an epidural area comprising a distal end formed with an annular cutting edge, wherein
- the distal end is gently curved, and
- the annular cutting edge has a forward half portion in the form of bifurcated convex surfaces over a plane including outer major and minor axes of said annular cutting edge, said annular cutting edge having an outer frontal corner part with a cutting angle that is larger than a crossing angle between said major axis and a longitudinal line of an outer surface of said outer needle in a plane including said major axis and perpendicular to said minor axis.
Dependencies are inferred from the claim text.