| 主权项 |
1. A multi-mode tissue dissecting device for delivering one or more medical devices to a target site, the device comprising:
a cannula having a working channel extending therethrough and exiting at a distal opening, where the distal opening permits movement of the medical device in a direction parallel to an axis of the working channel; a dilation wedge, smaller than an outer diameter of the cannula and located at a distal end of the cannula and configured to permit mechanical dilation of a small opening in tissue into a larger opening as a first dissection mode; a dissecting surface located on a portion of the dilation wedge, the dissecting surface having a frictional coefficient greater than that of a frictional coefficient of the cannula such that the dissecting surface grips the tissue as the dissecting surface moves against the tissue to dissection of tissue as a second dissection mode; and an expandable dilation member located about an exterior surface of the cannula to separate tissue when expanded as a third dissection mode. |
