Trauma Center: Under the Knife Tips

This operation is, in my opinion, the hardest non-GUILT operation in this game. Before you give up on it, though, here's a good strategy for beating it:

1) When several appear, inject them, then cut, but DON'T REMOVE until all have been cut.

2) When Angie mentions the Healing Touch... use it! That's your cue, and if you miss it, you can't win.