CPC A61F 2/2436 (2013.01) [A61F 2/9517 (2020.05); A61M 25/0141 (2013.01); A61M 25/0147 (2013.01); A61F 2210/0014 (2013.01); A61M 25/0136 (2013.01); A61M 2025/0161 (2013.01); A61M 2025/0681 (2013.01)] | 25 Claims |
1. A steerable sheath comprising
an elongated sheath, two or more actuators including a first actuator and a second actuator, at least two different sheath steering points including a first steering point and a second steering point, means for connecting the first actuator with the first steering point including a proximal cable, and means for connecting the second actuator with the second steering point including a distal cable;
a proximal pull ring including an open ring having two spaced apart ends, the proximal pull ring having an open space between the two ends of the open ring, and a distal pull ring, and the distal cable extending through the open space of the proximal pull ring;
wherein the distal cable extends through a first hole in the distal pull ring and returns in the opposite direction through a second hole in the distal pull ring, so that the distal cable has two parallel portions extending through the open space;
wherein the first steering point bends a first portion of the sheath in a first direction, and the second steering point bends a second portion of the sheath in an opposite direction;
wherein the first steering point is located distal to the second steering point when the steerable sheath is in an undeformed state having a linear orientation;
wherein the first portion of the sheath comprises a first hypotube oriented for bending in the first direction and the second portion of the sheath comprises a second hypotube oriented for bending in the opposite direction;
wherein the first and second steering points are located at least 10° from each other, optionally 10°, 20°, 30°, 45°, 90°, 120°, 140°, 160°, or 180° from each other.
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