Series D round for US medical devices company Ventus Medical boosts funding for Stanford lecturer.

Ventus Medical, a US-based maker of medical devices for sleep disorders, has raised $40m in its series D round.

Ventus previously raised $16m in its series C in January 2008.

The company’s website said its investors have been Johnson & Johnson Development Corporation, the corporate venturing unit of healthcare company Johnson & Johnson, and venture capital firms Mohr Davidow Ventures and De Novo Ventures.

Ventus’ founder, Rajiv Doshi, was previously a principal at De Novo while teaching at…