Well those are not deities - Marbas is from the Ars Goetia 9 one of the the books in the Lesser Key of Solomon) and has gained a reputation for healing, and Raphael is an angelic who’s name means the “Healing of God”.
You can evoke them or use the sigil method the same as any other entity. This question is asked and our responses are here How do I get started in summoning magick and make contact?
Always use the search first - you have 14 years of posts at your disposal and will get an answer much faster, and we also like you to extend an existing discussion over staring new ones. The posting guidelines are here in the FAQ