A catheter comprising: an inner tubular member having a proximal end portion, a distal end portion and an exterior surface, the inner tubular member further having a fluid lumen defined therein； an outer tubular member movable relative to the inner tubular member, the outer tubular member having a proximal end, a distal end and an interior surface directed toward the exterior surface of the inner tubular member； characterized by the fluid lumen having a fluid flow port defined by the exterior surface along the distal end portion of the inner tubular member； a proximal seal extends from the interior surface of the outer tubular member toward the exterior surface of the inner tubular member, the proximal seal located proximal to the fluid flow port； a distal seal extends from the exterior surface of the inner tubular member toward the interior surface of the outer tubular member, the distal seal located distal to the fluid flow port； a pressure chamber is defined by the proximal seal, the distal seal, the exterior surface of the inner tubular member and interior surface of the outer tubular member, with the pressure chamber in fluid communication with the fluid flow port, wherein fluid introduced through the fluid flow port and into the pressure chamber applies a force on the proximal seal to urge the outer tubular member in a proximal direction； a spring is disposed to bias the outer tubular member in the proximal direction； and a dissolvable adhesive is provided to maintain the spring in a compressed configuration until the adhesive is dissolved.
