| http://www.w3.org/ns/prov#value | - When a trocar or other surgical instrument is inserted through the valve seat opening 48 into the housing 6 of the cannula assembly, it will engage the valve plug 34 and cause the support plate 54 to pivot against the force of the spring 58 towards the side 46 of the housing so that the valve plug 34 is out of engagement with the valve seat 32.
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