We had an occation to try from the third party vendor for Hitachi one /Maternity wing unit for the Gynaec use.
Since it involves higher cost , our Medical Chief didn't want to take risk.Then we solved the problem with the supplier who was also doing annual maintenance.
But now a number of vendor are there, if go in the internt, we can see a lot.
Some are
www.allimaging.com www.devisultraserve.com www.cvsxducers.com and
www.prioritymedical.com