Medical instrument has two interfitting cannulas with curvature altered by twisting by means of cog wheels, or drive mechanism.

摘要

The implement has two interlocking and curved cannulas (1,2) which can be relatively twisted so that the total curvature of the interlocked cannulas can be altered by twisting. The appliance for twisting the cannulas is in the form of at least one cog wheel (3,4) or drive mechanism (6,8). The cannulas are of a size to be used for a biopsy, invasive therapy, or endsoscope.