Patent ID: 9226734
Filing Date: 2016-01-05
CPC Classification: A61B

Claim Text:
1. An apparatus for obtaining a biopsy sample, comprising: a first cannula having a lumen surrounded by a lumen wall, said first cannula having a distal end with a sharp edge, said first cannula further having a slit beginning at a point proximal of said distal end and extending proximally, said wall between said distal end and said slit being smooth; a second cannula within said lumen of said first cannula, said second cannula having a lumen and a closed distal end tapering to a point, said second cannula having an outer diameter such that said second cannula has a close and rotatable fit with said wall of said first cannula, said second cannula further having a slit beginning at a point proximal of said tapering distal end surface and not in the tapering surface and bounded by at least one sharpened edge, wherein said cannulas have a first open relative position, in which said slits define an open passage from the exterior of said first cannula to the lumen of said second cannula, and a second closed position, in which said slits are rotationally offset from each other, and wherein change between said first position and said second position is accomplished by rotation of at least one of said cannulas, and wherein said slits are helical and extend about 360 degrees around said respective first and second cannulas.