A medical device system may include an elongate shaft having a lumen extending from a proximal end to a distal end, a release wire disposed within the lumen of the elongate shaft configured to releasably attach a medical device to the distal end of the elongate shaft, and a securement member releasably coupled to the proximal end of the elongate shaft and fixedly attached to a proximal end of the release wire. A proximal portion of the securement member may be configured to translate proximally away from the proximal end of the elongate shaft upon application of a proximally-directed force to the proximal portion of the securement member and radially inward directed force to the distal portion of the securement member while the elongate shaft is maintained in a fixed position.
