How to perform healing meditation

Hi All, I recently had an injury and I tried to used a visualization meditation to heal the affected area. However, to be blunt I feel it didn?t have much effect on the pain or the injury. While I understand that it may be that I have not developed the correct skills etc, to perform this healing meditation.
So any advice or links would be helpful. As just because this mediation didn?t work for me doesn?t mean that it doesn?t work at all, it could just be that I am not doing it right, so hence this posting.
Also has anyone had any positive results from this type of healing-practice. As due to the injury, performing any asana?s at the time was not practical.

Thanking you in advance.