Chiyo using a Reincarnation Ninjutsu on Gaara: the One's Own Life Reincarnation.
Reincarnation Ninjutsu (転生忍術, Tensei Ninjutsu, literally meaning: Life Transfer Ninja Techniques" or "Reincarnation Ninja Techniques) are techniques that usually require or accomplish the transfer of life force between people. These techniques are generally classified as kinjutsu because the restoration of one life typically requires the sacrifice of the life of the user.