Vacuum Bell in the Children’s Hospital.
The Vacuum Bell at the Children's Hospital of the King's Daughters, Norfolk, USA. Cradle of the Nuss procedure https://www.youtube.com/watch?v=Zqhd7jSua6o&fbclid=IwAR0xiOqbz76d1Ng2pVNaO_BJ2lAOy5oukp-cVPLBKadcyCrpTsfbE_ZtyUw