Steerable tissue manipulation medical devices and related methods of use

A method for manipulating tissue within a body of a patient, the method comprising:

• introducing a medical device into the body, the medical device including:
• a tubular member having a proximal end, a distal end, and a lumen extending between the proximal end and the distal end;
• and
• an elongate member having a proximal end and a distal end, wherein at least a portion of the elongate member is movably disposed within the lumen of the tubular member, wherein the distal end of the elongate member includes an end-effector, wherein a portion of the elongate member between the proximal end and the distal end is configured to transition from a first state to a second state when the portion is advanced out of the lumen of the tubular member, and wherein the portion is proximal of the end-effector;
• advancing the medical device to a desired location in the body;
• deploying the elongate member by sliding the elongate member relative to the tubular member such that the portion transitions from the first state to a second state, and
• manipulating the end-effector.