U.S. Patent 3,216,423

US Patent 3,216,423 is for an apparatus which utilizes centrifugal force to facilitate the birth of a child at less stress to the mother.

It's in the public domain, so feel free to build this deathtrap birthing-device in your basement.  

The best line in the specification is in column 6, line 49-53:

...the preferred condition where the number of g's employed in accomplishing the birth of the child is relatively high (say above 8 g's), the machine may be constructed as is indicated in FIG. 4.

8 g's?  I think childbirth the old fashion way is the better choice here.