| CPC A61M 25/0133 (2013.01) [A61B 34/30 (2016.02); A61B 18/24 (2013.01); A61B 2034/2061 (2016.02); A61B 2034/301 (2016.02); A61M 25/0113 (2013.01); A61M 25/0147 (2013.01); A61M 25/0158 (2013.01); A61M 2025/0166 (2013.01)] | 19 Claims |

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1. A medical system comprising:
a catheter comprising a lumen, a distal steerable segment, and a distal tip;
a sheath disposed within the lumen of the catheter; and
a control system coupled to the catheter, wherein the control system includes:
a memory operable to store desired position coordinates; and
a plurality of modes including a stiffening mode in which the control system actively maintains the distal tip at the desired position coordinates, wherein the sheath is extendable from the distal tip of the catheter while the control system actively maintains the distal tip at the desired position coordinates in the stiffening mode.
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