Systems and methods for tissue removal

Abstract A system for removing a tissue specimen through a body opening defining a tissue margin. The system comprises a shield including a band made of flexible cut resistant material; the band having an inner surface and an outer surface interconnected by a top end and a bottom end and by a first end and a second end. The band is configured to define a central lumen having a longitudinal axis. The central lumen has a lumen diameter that is perpendicular to the longitudinal axis. The band is split such that the band is movable into a reduced configuration where at least a portion of the outer surface at the first end overlaps and is in juxtaposition with the inner surface at the second end to form a spiral and define an overlapping portion; the shield being configured to have a variable lumen diameter by varying the overlapping portion. The system also comprises a locking mechanism configured to fix the lumen diameter. The locking mechanism includes a plurality of inner abutments formed on the inner surface and a plurality of outer abutments formed on the outer surface. Each of the plurality of inner abutments being configured to contact one of the plurality of outer abutments or the first end to prevent reduction of the lumen diameter in a locked configuration. A portion of the band is jogging outwardly to form a ridge in the inner surface defining an increased lumen diameter.