| http://www.w3.org/ns/prov#value | - a first leg having a first end means for engaging the inner surface of the cannula; and a second leg connected with said firs leg, said second leg having a second end means for engaging the inner surface of the cannula, and means for moving said first and second end means away from each other, said first and second end means including means for applying a radially outwardly directed force to the i
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