I’m going to echo the Raphael thing. Also try Marbas. But here’s a few more options. I have successfully healed myself and others with the following. For one, the rite of deification is incredibly valuable. That is available through J.S. Garrett, OR you can do it yourself by getting Anthology 3, or watching JS explain it on YouTube. The short version is this(not to give it all away)- you evoke the spirit of the human target, make an animal sacrifice and command the target’s spirit to consume the animal’s life force as its blood spills. Then you dismiss the target back to his body. Also, animal sacrifice empowers any healing ritual that requires a great deal of force, such as healing a brain, heart, lungs, or something major. I’ve done this myself.
Now, if none of that is for you, can you get your hands on this person? If so, lay your right hand on him, get yourself into a deep focus, like a trance. Mentally call Raphael into you. Now see yourself filled and surrounded with either green or blue light. See that energy travel up your right arm and into the target, command healing “I command So-and-so’s brain to be healed, restored to full balance and health. I thank the Universe that he is healed. By the hand of Raphael and by the power of my own Divinity, he is healed.” Hold the visualization of the light for a minute and then see the brain being healed, even the microscopic cells being healed. Feel gratitude and joy for the healing and have the target give thanks as well.
Now, if that’s not possible either, my last advice is to use a clay effigy or a human-shaped candle, and let it stand in his place. Use the same process I just gave you while burning incense and blue candles. Except this time, anoint the effigy or candle with healing oil. Also, invoke/evoke Raphael or Marbas to assist you as you do this.
After you’ve done one of these things, continue the Raphael mantra given by @Lady_Eva for several days. Also, keep up the gratitude and visializations of him being healed.