During the Battle of Uhud, Hazrat Ubayy (ra) was struck by an arrow which pierced into his median vein, which carries blood to the head, chest, back and to the hands and feet. Subsequently, the Holy Prophet (sa) sent a physician to treat him, who then cut the vein and then branded it with his own hand.
(Sheikh Shah Moinuddin Ahmad Nadvi, Siyar al-Sahabah, Vol. 3 [Karachi, Pakistan: Dar al-Ishaah Urdu Bazar, 2004] 141, 142) (Urdu Lughat, Vol. 22, p. 29, Urdu Lughat Board, Karachi)