Longitude Capital has announced it has closed its fourth fund with $585 million in capital commitments.

The new fund — Longitude Venture Partners IV — will invest in biotechnology, medical technology and health solutions companies.

Longitude Capital, with offices in Menlo Park, Calif., Greenwich, Conn., and Boston, is a healthcare venture capital firm. Founded in 2006, the firm invests in privately held and publicly traded companies through a variety of investment approaches. These include traditional venture capital investing and special situations, such as spin-outs, equity-linked transactions and private investments in public equities.