Denmark-based foundation Novo has helped Inogen, a manufacturer of oxygen therapy equipment and services, raise $20m.
Novo led the round on Wednesday last week.
Heath Lukatch, Novo partner and Inogen chairman, said: "Inogen has created a unique success model rooted in patient satisfaction that is rarely found in the therapeutic oxygen industry and Novo is proud to support Inogen’s vision and its substantial growth to meet market demand."
Inogen is also backed by venture firms Versant Ventures, Accuitive Medical Ventures, Avalon Ventures, Arboretum Ventures, according to its website.
The latest fundraising takes Inogen to as much as $90.8m raised in its history, according to Global Corporate Venturing analysis.
In 2009 Inogen raised $3.1m, according to a Securities and Exchange Commission filing. In 2007, Inogen raised $12.7m and $27.6m, according to two different filings. In 2006 it said it had raised $9.5m of a planned $14.5m, as well as raising $7m, according to two different filings. In 2004 the company said it had raised $5.9m, in another filing.