Three venture capital firms rather than original backer Boston Scientific provide $20m for US-based medical equipment company TyRx.

US-based medical equipment company TyRx has raised $20m from its venture capital (VC) investors, although US-based peer and previous investor Boston Scientific was not named as part of the consortium.

VC firms HLM Venture Partners, Clarus Ventures and Pappas Ventures provided the $20m of equity, with a further $4m of debt provided by Comerica Bank.

TyRx raised $25m in February 2008 from Clarus and Pappas. Boston Scientific invested an undisclosed amount in January 2005 after three years co-developing coatings for…