A retrieval device (10; 100; 800) having a contracted state and an expanded state, comprising: a sheath (12; 104; 804); a drive member; at least three support members (26, 28, 30; 158, 160, 162) each having at least two lumens, a proximal end fixed to the sheath (12; 104; 804), and a distal end movable relative to the sheath (12; 104; 804); and at least three movable members (18, 20, 22; 152, 154, 156) movable relative to the support members (26, 28, 30; 158, 160, 162), each of the at least three movable members (18, 20, 22; 152, 154, 156) including a first leg (18a, 20a, 22a), a second leg (18c, 20c, 22c), and a U-shaped bend (18b, 20b, 22b) located between the first and second legs of the respective movable member and distally of the distal ends of the at least three support members (26, 28, 30; 158, 160, 162), wherein each movable member (18, 20, 22; 152, 154, 156) extends from a first end thereof coupled to the drive member through a lumen of one support member (26, 28, 30; 158, 160, 162) of the at least three support members (26, 28, 30; 158, 160, 162) along the respective first leg (18a, 20a, 22a), forms the respective U-shaped bend (18b, 20b, 22b), and extends through a lumen of a different support member (26, 28, 30; 158, 160, 162) of the at least three support members (26, 28, 30; 158, 160, 162) along the respective second leg (18c, 20c, 22c), wherein each of the at least three movable members (18, 20, 22; 152, 154, 156) are configured to slide distally within more than one of the at least three support members (26, 28, 30; 158, 160, 162) during transition of the retrieval device (10; 100; 800) from the contracted state to the expanded state, wherein one or more of proximal ends of the second legs (18c, 20c, 22c) include a stop sized to engage a proximal end of a support member (26, 28, 30) after moving a distance distally during a first phase of a movement of the retrieval device from the contracted state toward the expanded state, wherein during the first phase the support members extend generally parallel to one another, wherein, during a second phase of the movement of the retrieval device from the contracted state toward the expanded state beginning after the stop has engaged the respective proximal end of one of the support members, the first legs of the at least three movable members are configured to move further distally relative to the support members and second legs of the movable members remain stationary relative to the support members, wherein, during the second phase, distal portions of the movable members and the support members expand radially outwardly. a sheath (12; 104; 804); a drive member; at least three support members (26, 28, 30; 158, 160, 162) each having at least two lumens, a proximal end fixed to the sheath (12; 104; 804), and a distal end movable relative to the sheath (12; 104; 804); and at least three movable members (18, 20, 22; 152, 154, 156) movable relative to the support members (26, 28, 30; 158, 160, 162), each of the at least three movable members (18, 20, 22; 152, 154, 156) including a first leg (18a, 20a, 22a), a second leg (18c, 20c, 22c), and a U-shaped bend (18b, 20b, 22b) located between the first and second legs of the respective movable member and distally of the distal ends of the at least three support members (26, 28, 30; 158, 160, 162), wherein each movable member (18, 20, 22; 152, 154, 156) extends from a first end thereof coupled to the drive member through a lumen of one support member (26, 28, 30; 158, 160, 162) of the at least three support members (26, 28, 30; 158, 160, 162) along the respective first leg (18a, 20a, 22a), forms the respective U-shaped bend (18b, 20b, 22b), and extends through a lumen of a different support member (26, 28, 30; 158, 160, 162) of the at least three support members (26, 28, 30; 158, 160, 162) along the respective second leg (18c, 20c, 22c), wherein each of the at least three movable members (18, 20, 22; 152, 154, 156) are configured to slide distally within more than one of the at least three support members (26, 28, 30; 158, 160, 162) during transition of the retrieval device (10; 100; 800) from the contracted state to the expanded state, wherein one or more of proximal ends of the second legs (18c, 20c, 22c) include a stop sized to engage a proximal end of a support member (26, 28, 30) after moving a distance distally during a first phase of a movement of the retrieval device from the contracted state toward the expanded state, wherein during the first phase the support members extend generally parallel to one another, wherein, during a second phase of the movement of the retrieval device from the contracted state toward the expanded state beginning after the stop has engaged the respective proximal end of one of the support members, the first legs of the at least three movable members are configured to move further distally relative to the support members and second legs of the movable members remain stationary relative to the support members, wherein, during the second phase, distal portions of the movable members and the support members expand radially outwardly.