Methods of advancing a cannula system into a body

摘要

A method for advancing a device positioned coaxially with respect to a cannula comprises rigidizing a portion of the cannula and advancing the device until a first preestablished limit of relative displacement between the cannula and the device is reached. The method further comprises relaxing the portion of the cannula and advancing the cannula until a second preestablished limit of relative displacement between the cannula and the device is reached.

主权项

1. A method for advancing a device positioned coaxially with respect to a cannula, said method comprising:
rigidizing a portion of said cannula via an actuator coupled to said cannula; advancing said device until a first preestablished limit of relative displacement between said cannula and said device is reached, wherein advancing said device comprises moving a displacement limiting coupling parallel to a longitudinal axis of said cannula; relaxing said portion of said cannula; and advancing said cannula until a second preestablished limit of relative displacement between said cannula and said device is reached, wherein advancing said cannula comprises moving the actuator parallel to a longitudinal axis of said device.