Abstract: A transponder implanter for implanting an encapsulated transponder in living tissue, including a lancet, the lancet having a sharpened end and an interrupted cross sectional perimeter dimensioned to receive therein the encapsulated transponder. The lancet is connected to a lancet puller supported by a lancet barrel. A biasing member is interposed between the lancet puller and the lancet barrel and controlled by a release operably engagable to the lancet puller and capable of holding the lancet puller in a first position and resisting a biasing force operably applied to the lancet by the biasing member that tends to withdraw the lancet into the barrel. The release is also capable of releasing the puller such that the lancet withdraws into the barrel and a pushrod holds the encapsulated transponder substantially stationary relative to the barrel as the lancet is withdrawn.