| http://www.w3.org/ns/prov#value | - The apparatus of claim 44, wherein said clamp assembly comprises:a ring sized to substantially encircle the cannula, said ring including a pair of adjacent free ends; a pair of opposing arms, each extending from a corresponding one of said free ends of said ring, said arms defining a slot extending therebetween; a mechanism connected to said arms operable to compress said arms toward each other; a
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