摘要：

A percutaneous access device includes an inner tube (12) and an outer tube (14) disposed about at least a portion of the inner tube (12). The outer tube (14) may be sized to span from a skin incision in a patient to a site proximate the spine of the patient. The distal end of the outer tube (12) may be adapted to releasably engage a bone anchor (102). The inner tube (12) may be adjustable relative to the outer tube (14) between a first position and a second position in which the distal end of the inner tube (12) contacts the bone anchor (100). A bone anchor assembly (100) includes a bone anchor (102) having a distal bone engaging portion (106) and a receiving member (108) having a recess (114) for receiving a spinal fixation element. The proximal end of the receiving member (108) may have an arcuate groove (130) formed on an exterior surface thereof to facilitate connection of the distal end of the outer tube.

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