The Johnson & Johnson-backed medical device company has raised almost $50m in its latest round of funding, as clinical tests for its new system continue.

US-based implantable device maker Neuropace has secured $49m in funding, according to a filing with the US Securities and Exchanges Commission, from an overall planned offering of $62m.

Although the investors in the round were undisclosed, Neuropace previously raised $23m in funding, in September 2008, from Kleiner Perkins Caufield Byers (KPCB), Interwest Partners and Domain Associates.

Prior to that round, Neuropace’s series B round attracted $30m in financing, in 2005, from the above backers, as well as VC firms…