Re: Repurposing medical devices
Repurposing unrelated equipment is a great tradition. In terms of medical equipment, the standard way of waterproofing a microphone has often been a condom.
Didn't Trevor Baylis create the prototype of his wind-up radio from a musical box and the motor from a toy car? (I think that's what Wikipedia says).
My boss in my first "proper" job had spent some time in his youth working at a hospital in India and one of his favourite stories was his creation of a heart rate monitor (or maybe a cardiograph?) by repurposing an electric typewriter. No idea how that worked, but if anyone could do it, it would have been he.
M.