Control system for a stent delivery system

A stent delivery system comprising:

• a first shaft;
• a second shaft, the second shaft movable relative to the first shaft and coaxially extending within the first shaft;
• a stent having a first end portion operably connected to the first shaft by a first constraining member and a second end portion operably connected to the second shaft by a second constraining member so that the first and second constraining members, in response to movement of the second shaft to the first shaft, apply a longitudinal tension to or release the longitudinal tension from the first end portion of the stent and the second end portion of the stent;
• and
• a control system comprising:
• a housing having a chamber formed therein;
• a first drive at least partially positioned and movable within the housing and operably connected to the first shaft;
• a second drive at least partially positioned and movable within the housing and operably connected to the second shaft;
• a biasing member, the biasing member comprising a spring:
• and
• a pressure controller operably connected to the housing, the pressure controller changing the pressure within the chamber and to move the second drive relative to the first drive so that movement of the second drive relative to the first drive in a first direction causes the second shaft to move relative to the first shaft to expand the stent operably connected thereto and movement of the second drive relative to the first drive in a second direction causes the second shaft to move relative to the first shaft to reconstrain the stent from an expanded configuration to a constrained configuration so that the longitudinal tension is applied to the first end portion and the second end portion of the stent in the constrained configuration by movement of the second drive relative to the first drive in the second direction.