Got past that. Lex's hand is too uber to work on the console. You have to disable the force bar on the holding cell with the nursebot in it, then find the other console in the security room that activates the nursebot controls. Have the nursebot move over to Caynan's arm, and pick it up off the ground (the closed pincer button). Move the nursebot as close as you can to the hand scan reader and then power it off (red power button). Read Caynan's logbook for the security code for the door. Then enter it in the security room console. It will say something about insufficient weight entered.
Exit the console and walk right behind the nursebot. You'll notice a square on the ground behind the nursebot. Stepping on this, with the security code already entered correctly, and the nursebot holding Caynan's hand up to the monitor will open the door.
If that doesn't work, no worries. I'm making a save at every fight, though im almost on 9th slot and will have to overwrite first.
Remember right when you open that door is a hallway. In the middle of the hallway is a little coridoor where the elevator is, and to the end of the hallway is a room with experimental test subjects encased in carbonite. 😜
This room is your target, but patrolling this hallway is a sentrybot (nasty bugger). You have to hide in that mid-hallway coridoor and wait for it to pass, then walk through.
If you can't get past the console for technical reasons, i've made a zipfile of my first 6 saves. By the sixth save, Dane was put out of his misery; Caynan is still alive, the unarmed guard in the top level was alive (last time I checked), and the guard in the Icarus top level bay is alive, though he's holding a logbook you might want to check out.
Sadly, I think I had put the combat on hard mode accidentally. Later i'm going to see if I can edit the save file with a text editor, maybe that could reset things.