The high price tag is probably due more to the test & documentation than to the cost of the technology (components) itself.
The patient wore electrodes and an iPod sized transmitter on their chest hanging from a neck-strap
Also, don't forget you are connecting the patient to circuit ground. Ground currents that are not an issue to unbroken skin can become a hazard. There is a reason an operating theater has antistatic measures taken.
There is a reason an operating theatre has antistatic measures taken.