CPC A61B 17/22 (2013.01) [A61B 2017/22038 (2013.01); A61B 2017/22051 (2013.01); A61B 2017/22084 (2013.01)] | 20 Claims |
1. A medical instrument comprising:
a tube;
a sheath provided around the tube and coaxial with the tube;
an inflatable balloon provided at a distal end of the sheath, the balloon being configured to receive a fluid from a lumen of the sheath, and the balloon having:
a central opening along a longitudinal axis thereof, and into which the tube extends;
a proximal portion;
a middle portion adjacent to and distal of the proximal portion; and
a distal portion adjacent to and distal of the middle portion, the distal portion including a planar distal-facing surface and a distal neck distal of and perpendicular to the distal-facing surface,
wherein, in response to inflation, a maximum diameter of the middle portion is less than or equal to a maximum diameter of the proximal portion, and is less than a maximum diameter of the distal portion; and
an extraction member provided at a distal end of the tube, distal to the balloon, and movable axially relative to the balloon.
|