Apologies for the delay in replying. This is very helpful. I was thinking direct injection into the CSF region using an insulin syringe. Does this reliably result in diffusion or drug/virus etc into the spinal tissue? Based on what you described above regarding the lumbar enlargement procedure, I probably got my language a little mixed up, my goal primarily is to inject into the CSF and let the substance diffuse into the spinal tissue if possible.