Piedmont Stone Center PLLC, a health care company that treats kidney stones, has raised $425,301, according to a filing with the Securities and Exchange Commission.

The initial capital contribution was $28,353 with the balance payable in mandatory annual capital contributions through Jan. 1, 2022, according to the filing.

The money was raised in the form of equity from three investors.

Piedmont Stone Center, which has offices in Virginia and North Carolina, uses the mobile lithotripter to provide non-surgical treatment using Extracorporal Shock Wave Lithotripsy to target kidney stones in their patients.

Lithotripsy is an alternative to surgical kidney stone removal which lasts 30 to 90 minutes and has a recovery time of one to three days.

In the United States, about five million people currently suffer from kidney stones, according to the company website.

The company has been led by Charles Hauser, chief executive officer, since 1997.

Hauser received his BA in chemistry from the UNC-Chapel Hill and his MBA from UNC-Greensboro.

He served as the director of personnel at Forsyth County Hospital Authority, Inc. from 1975 to 1978. He served as the president of Piedmont Medical Research Associates Inc., which he co-founded, from 1980 to 2006.