| 主权项 |
1. An apparatus for targeting a desired target site on a body tissue comprising a wall of a first body cavity of a patient, the apparatus comprising:
a target catheter having a longitudinally extending target catheter lumen surrounded by a tubular target catheter wall having an outer surface; a framing member having a collapsed condition in which the framing member is adapted for insertion into the first body cavity and an expanded condition in which the framing member is adapted for placement within the first body cavity, the framing member, when deployed into the expanded condition, having:
a longitudinal framing member core defining a central framing member axis;a framing member body which includes a three-dimensionally bulbous portion defining a maximum body footprint in a lateral dimension and having longitudinally spaced proximal and distal body ends which are both longitudinally spaced from the maximum body footprint, a diameter of the bulbous portion being significantly smaller at the proximal and distal body ends than at the maximum body footprint, the proximal body end being attached to the outer surface of the target catheter wall, anda protrusion located at the distal body end, the protrusion having a diameter which is smaller than the diameter of the maximum body footprint, the protrusion extending longitudinally distally from the distal body end of the bulbous portion; at least one target point carried by the framing member and adapted for placement adjacent the desired target site; and at least one target pathway attached to at least one target point, at least a portion of the target pathway extending through the target catheter lumen, and the target pathway being substantially spaced apart from the framing member body; wherein the framing member comprises a plurality of longitudinally extending multi-segment framing strands, the plurality of framing strands being radially arranged in an array lateral to the central framing member axis, each framing strand having a distal strand end longitudinally spaced from a proximal strand end by a strand body, the proximal and distal strand ends being connected to the framing member core with at least one of the proximal and distal strand ends of each framing strand being slidably connected to the central framing member core, the strand bodies of the plurality of framing strands each comprising a plurality of substantially rigid strand segments pivotally connected end-to-end with each other by interposed strand hinges; and wherein actuation of the slidable ones of the proximal and/or distal strand ends of at least one framing strand into motion along the central framing member core causes movement of at least a radially corresponding portion of the framing member between the expanded and collapsed conditions. |
