Delivery systems and catheters including lock and release connectors for implantable devices and methods for retaining, positioning, and deploying a medical device are disclosed. The lock and release connectors can include a body and at least one door engaged with the body, wherein the door is moveable from a first position to a second position. The lock and release connectors can further include at least one fastener connecting at least one end of the door to the body. The door can be integral with the body or connected and can comprise a shape memory material and/or other materials.
