The amount of the transaction was not disclosed.
Amadeus Capital Partners, which joined Montezemolo & Partners as an investor in Bellco, will support the company in its next stage of development.
Led by Chairman Antonio Leone, Bellco provides therapies and systems for the treatment of renal failure, multiple organ failure, sepsis and congestive heart failure.
Last year, the company introduced new dialysers for both chronic and acute renal failure and launched a new generation of patented dialysers to treat sepsis and acute lung injury in intensive care units, as well as the first dialysis system for new-born babies.
Bellco currently employs some 370 people at its two plants in Mirandola and Toulouse, France, and at subsidiary operations in Spain, Belgium, Sweden and Canada. In 2012, the company generated over €100m revenue and EBITDA approaching €15m.