Needle assembly and methods useful for epidural anesthesia

Details Needle assembly and methods useful for epidural anesthesia Needle assembly and methods useful for epidural anesthesia

1994-04-05

1997-11-11

Bockelman, Mark

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604239, 604264, 604272, 604 51, A61M 5178

Patent

active

056858523

ABSTRACT:
The needle assembly of the present invention includes a hollow cannula having a sharp distal end, a hollow stylet having a blunt distal end with a radial opening and an interior deflection surface near the radial opening, and a mechanism for biasing the stylet in a first position where the blunt distal end of the stylet extends beyond the sharp distal end of the cannula. Preferably, the hollow cannula hub has a proximal end which is coupled, e.g., via insert molding, to a hollow cannula hub. Likewise, the stylet preferably includes a proximal end which is coupled, e.g., via insert molding, to a hollow stylet hub which is longitudinally movable within the hollow cannula hub. The mechanism for biasing typically comprises a spring inside the cannula hub which biases the stylet hub to the first position where the blunt distal end of the stylet extends beyond the sharp distal end of the cannula. The stylet is movable against the spring to a second position where the sharp distal end of the cannula extends beyond the blunt distal end of the stylet. A first indicator is provided on the cannula hub showing the position of the stylet relative to the cannula and a cannular orientation indictor on the cannula shows the direction of the radial opening.

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