Sorry to hear your situation; but think in this way, it is his luck to have you as his father who can provide him better care.
May I also contribute to your case referring your concern?
1) If each electrode from one channel is placed on each bicep muscle, what is the track of the electrical pulse? From one electrode, through arm, chest (clavicle, sternum, clavicle), other arm, to another biceps?
Suggestion: In each channel, one pair of electrodes (red and black) on one side of biceps, don't cross the chest. WRONG placement: The red electrode on one side and the black electrode from the same channel on the side biceps. The current will pass through the chest and may affect the heart.
1)It seems that the current is in close proximity to the epiphysial regions- I understand that it may harm the epiphysial plate and disturb long bone growth. Suggestion: Electrical stimulation may not directly affect the growth plate, we just worry if the current is too strong, a strong contraction of the muscle will pull a traction force to the site. Usually, a visible contraction is enough, don't worry, it is easy to control.
2) In spite of the safe/not safe issue, do you have any idea what could be the most optimal electrode placement? The actual difficulty is the length of new-born child limbs: the smallest commercial electrodes are 32mm in diameter while his forearm length is approximately 5 mm long.
Suggestion: Actually, we can cut the carbon electrodes into the optimum sizes we need and they will be fully functional. 5 mm maybe too challenging, one rule is that the space between two electrodes should be more or less as the size of the electrode ie. electrodes contract -> short circuit. If the electrodes are too small, the density of the current will be high. Perhaps can wait for free months to let him grow in size first.
3) May you advise the most appropriate type of electrical stimulation and its parameters? In one of the files available in „download section” on this website, it is advised to use the following parameters: Very Weak Muscles / Marked Atrophy 10Hz @ 400 us 2 sec ON / 2 sec OFF (minimum) minimum 1 hr day Minimal contraction.
Suggestion: I think it is hard to recommend the most suitable parameter since it is hard to do control trial research on paediatric cases. Since both the web site and Wendy suggested 10 Hz, I think their clinical experience is convincing enough. For adults, muscle re-education we use 35-50Hz, 150-200us.
If you want to test different parameter, I suggest you can see which parameter requires less current to produce the contraction, then it would be better.
Best regards, Chris