Balloon catheter

A catheter comprising:

• an elongated catheter shaft defining a first lumen and a second lumen, the elongated catheter shaft having a proximal end and a distal end;
• a first port fluidically coupling the first lumen to the second lumen;
• a balloon coupled to an exterior of the elongated catheter shaft;
• a second port fluidically coupling the second lumen to the balloon;
• an activating member moveable between a first position and a second position, wherein the activating member prevents fluid from flowing from the balloon to the first port in the first position, and wherein the activating member allows fluid to flow from the balloon to the first port in the second position;
• and
• a tether having a proximal end and a distal end, wherein the distal end of the tether is coupled to the activating member, and wherein a movement of the proximal end of the tether in a proximal direction causes the activating member to transition from the first position to the second position,
• wherein the proximal end of the tether is attached to the elongated catheter shaft proximal to the distal end of the elongated catheter shaft, and
• wherein an elasticity of the elongated catheter shaft is greater than an elasticity of the tether.