LIST of books about Biomedical DSP.
h**p://www.dsprelated.com/books-1/hf/all/Biomedical_DSP.php
Another book "Biomedical DSP. Tompkins" recently was in Uplo@d/Downlo@d forum.
You must search while being inside forum.
Also companies which produces biomedical equipment give standards to which the eqiupment is sertified. Learning this standards you may find something useful for you.