Occlusive implant delivery devices and associated methods

Apparatus for delivering an occlusive implant to a treatment site, the apparatus comprising:

• a delivery system comprising an outer sheath having a distal tip sized and configured for transcervical insertion, an inner sheath slidably received within the outer sheath and having a distal tip sized and configured for transcervical insertion, and an elongate pusher member received within the inner sheath;
• wherein the inner sheath has a distal-most first position in which the distal tip of the inner sheath is located distally of the distal tip of the outer sheath, and is retractable to a second position in which the distal tip of the inner sheath is closer to the distal tip of the outer sheath;
• an occlusive implant sized and configured for insertion into a fallopian tube, and slidably received within the inner sheath about the pusher member;
• and
• a reciprocation drive configured to reciprocate the pusher member longitudinally within the inner sheath as the inner sheath retracts proximally toward the distal tip of the outer sheath.