Lead locking system and method for implantable stimulators

A header lock assembly includes a header lock pin and mating lead lock collar that provide a releasable coupling for attaching one or more leads to a device. The header lock assembly is configured to engage the lead to assure closure while not applying undue pressure on the lead. One or more notches in the header lock pin allow the lead to pass the header lock pin unimpeded while the header lock assembly is in an unlocked configuration. Rotation of the header lock pin engages a circumferential groove in the lead lock collar to secure the lead to the header. A slot in the top of the header lock pin provides an interface surface with a lead locking tool for rotating the header lock pin. The slot orientation provides a visual indication of the header lock assembly being in a locked or unlocked configuration.