According to the story behind their design, the Blonskys - husband and wife - had visited the zoo and seen an elephant twirling in circles. A zookeeper explained to them elephants do this before giving birth.
Which, by the way, they don't, because centrifugal force isn't necessary for birth.
If the Apparatus For Facilitating The Birth Of A Child By Centrifugal Force was in fact some clever piece of art critiquing medicalisation of birth, then the Blonskys played a blinder, as the patent documentation is delivered entirely straight-faced and with huge attention to detail.
You can enjoy the full technical specifications of the birth centrifuge here https://patents.google.com/patent/US3216423A/en