APPARATUS FOR ACCURATELY CONTROLLING NEEDLE EXTENSION

摘要

Devices are illustrated which provide for accurately controlling the extension of a needle from a protective sheath to increase accuracy and improve the outcome of the treatment procedure.

主权项

1. A medical device comprising:
a needle comprising a proximal portion and a distal portion, wherein the distal portion of the needle comprises a sharpened tip; a sheath comprising a proximal portion, a distal portion, and a lumen extending between the proximal portion and the distal portion of the sheath, the lumen being defined by an inner surface of the sheath, wherein at least a portion of the needle is movably disposed through the lumen of the sheath; a plurality of spaced apart first engagement members affixed to one of the proximal portion of the needle or the inner surface of the sheath; a second engagement member affixed to the other of the proximal portion of the needle or the inner surface of the sheath, wherein the second engagement member is configured to releasably engage each of the first engagement members to provide incremental movement of the sheath relative to the needle.