Given that the company he works for delayed in providing the assistance he needs and that this is likely to negatively and severely affect his health 80 percent just isn't good enough. He should sue the bastards, after his surgery is done and his recovery effected (so they can't cut him off completely in vengeance for taking legal action, fire him etc); I should think that such self-preservation would be considered a valid reason for delaying the legal action.
Good luck, and I hope you make a fast and full recovery as far as possible, do you want me to prepare some pain relief? it will take me some time, of course, to purchase the necessary reagents (that I can do right away, miss K's SO, but of course they will take a little time period for them to arrive and me to perform the synthesis). But should you wish it of me, then it will be done, just tell your other half to relay your answer to me through miss K. One condition, and one only-I am not prepared to bugger about with fentanyl or its analogs, or the hyperpotent oripavine derivatives. The reason for this is that they are too dangerous to handle, a sub-microscopic speck (and I have a very good microscope) would be enough to kill many people, just by skin contact assuming said people could each touch an equal portion of such a speck. More toxic on a weight basis than most nerve 'gas' agents.
But that aside, then assuming I can prepare the compound, I am willing to offer you my skills for no cost to you or to miss K. Whether or not you accept, you have my sympathy indeed, I know how shitty tendon injury is, been there myself, and the pain isn't going to go away, been stuck with it for decades now, busily sucking ass hole each and every day for somewhat over the past 20 years. And since you are miss K's loved one, my services are at your disposal without cost.