| http://www.w3.org/ns/prov#value | - A cannula assembly for supporting a viewing elements comprising:a cannula having a length extending between a proximal end and a distal end; a clamp assembly, said clamp assembly including: a ring sized to substantially encircle said cannula, said ring including a pair of adjacent free ends; a mechanism engaged to said ring operable to bias said free ends towards one another to engage said ring to
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