By Chelsea Naso (July 1, 2014, 4:50 PM EDT) -- Investment banks and potential buyers have approached the private equity owners of ConvaTec, a medical supplies company that was once a unit of Bristol-Myers Squibb Co., to discuss a sale that could value the company between $8 billion and $9 billion, sources told Bloomberg on Tuesday. Avista Capital Partners and Nordic Capital won't start a formal sales process until later this year and are also considering an initial public offering for the Luxembourg-domiciled company. A sale could pave the way for yet another health care tax inversion, as ConvaTec would offer an American acquirer the ability to shift its legal domicile out of the U.S. and away from the 35 percent corporate income tax. ...