A device for implanting a substance into subcutaneous tissue or the dermis of a patient can include a housing, a hypodermic needle, a rod, and a bolt-action rod displacement mechanism. The hypodermic needle can include a lumen that is preloaded with a dermal filler thread. The rod can be configured to fit within the lumen of the hypodermic needle. Upon displacement within the lumen, the rod can cause displacement of the dermal filler thread within the lumen. The bolt-action rod displacement mechanism can be configured to displace the rod within the lumen away from a starting position toward the dermal filler thread.
