Application: an Implanted Ventricle Assist Device and a Total Heart.
The recently implanted Ventricle Assist Device and Total Heart were originally conceived and crudely designed in the early 1970's.
Their original design was a cam drum, then an hydro-pneumatic cylinder and then a ball screw.
None of these systems yielded the required reliability nor the required high force output that was needed from a very light actuator
which must be stroked an average 80 times a minute [which is more than 84 million times in 2 years].
Then in the early 1980's the answer came.
The Roller Screw is the muscle of choice for modern artificial hearts.
