St. Raphael is one of seven Archangels who stand before the throne of the Lord. He was sent by God to help Tobit, Tobiah and Sarah. At the time, Tobit was blind and Tobiah's betrothed, Sarah, had had seven bridegrooms perish on the night of their weddings. Raphael accompanied Tobiah into Media disguised as a man named Azariah. Raphael helped him through his difficulties and taught him how to safely enter marriage with Sarah. Tobiah said that Raphael caused him to have his wife and that he gave joy to Sarah's parents for driving out the evil spirit in her. He also gave Raphael credit for his father's seeing the light of heaven and for receiving all good things through his intercession. Besides Raphael, Michael and Gabriel are the only Archangels mentioned by name in the Bible. Raphael's name means "God heals." This identity came about because of the biblical story which claims that he "healed" the earth when it was defiled by the sins of the fallen angels. Raphael is also identified as the angel who moved the waters of the healing sheep pool.
O God, who gave blessed Raphael the Archangel unto thy servant Tobias to be the companion of his wayfaring : grant unto us thy servants ; that we may ever be protected by the guardianship of this same thine Archangel, and defended by his help. Through Christ our Lord. Amen.
As in real life, in my Traveller universe, Christians ask St Raphael for aid and protection on their journeys, and for aid in recovery when injured along the way.