In one embodiment, a delivery apparatus handle, such as for a mechanical heartvalve frame can comprise an actuationknob with a toggle mechanism that can toggle the actuation knob from a firststate in which the actuation knob is operable to causethe linear or rotational movement of multiple elements or sets of elements,such as tubes that are attached to, e.g., a mechanical heartvalve frame to cause expansion or collapsing of the frame, to a second statein which only a single element or set of elements is moved,allowing for additional operations, such as, e.g., locking the frame and/orreleasing it from the delivery apparatus.
