Repositionable closure device

A method for grasping tissue, comprising:

• mounting a closure device on a cap;
• attaching the cap to a distal end of an endoscope, the closure device comprising a first ring structure having a first distal portion and a first medial portion, a second ring structure having a second distal portion and a second medial portion, the first and second distal portions being movable between an open position, where the first and second distal portions form an angle relative to one another for receiving target tissue therebetween, and a closed position, where the first and second distal portions are drawn toward one another for gripping the target tissue, and an anvil about which the first and second medial portions are formed;
• and
• moving proximally one of the anvil and the first and second rings relative to the other one of the anvil and the first and second rings to move the first and second distal portions between the open position or the closed position.

A method for grasping tissue, comprising:

• mounting a closure device on a cap;
• attaching the cap to a distal end of an endoscope, the closure device comprising a first tissue capture structure having a first distal portion and a first medial portion and a second tissue capture structure having a second distal portion and a second medial portion, the first and second distal portions being movable between an open position, where the first and second distal portions form an angle relative to one another for receiving target tissue therebetween, and a closed position, where the first and second distal portions are drawn toward one another for gripping the target tissue, and an anvil about which the first and second medial portions are formed;
• and
• moving proximally one of the anvil and the first and second tissue capture structures relative to the other one of the anvil and the first and second tissue capture structures to move the first and second distal portions between the open position or the closed position.