| 摘要 |
A medical apparatus ( 29 ) for accessing a remote anatomical site is provided. The medical apparatus ( 29 ) includes a handle assembly ( 33 ) for releasably retaining a cannula ( 31 ). The handle assembly ( 33 ) includes a collar ( 40 ) slidable along a body portion ( 37 ) between a lock position for holding catches ( 36 ) on flexible detent arms ( 34 ) in an inward position and in engagement with a recess ( 30 ) in the cannula ( 31 ) to retain the cannula ( 31 ), and a release position for allowing the catches ( 36 ) to move radially outwardly to release the cannula ( 31 ). A channel ( 28 ) defined in the body portion ( 37 ) contains keys ( 68 ) that allow for insertion of the cannula ( 31 ) when aligned with grooves ( 64 ) defined in an outer surface of the cannula ( 31 ). A pair of grip tabs ( 48 ) extend radially in opposite directions from the collar ( 40 ) for manually moving the collar ( 40 ) to the release position and a pair of flexible arms ( 44 ), acting as springs, extend in opposite directions from the grip tabs ( 48 ) in outwardly bowed sections to bias the collar ( 40 ) to the lock position to retain the cannula ( 31 ) to the handle assembly ( 33 ).
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