Health care company Piedmont Stone Center PLLC raised $238,712 in equity, according to a filing Friday with the Securities and Exchange Commission.

According to the filing, the initial contribution was $23,871 with the balance payable in mandatory annual capital contributions through Jan. 1, 2023.

The Winston-Salem-based company raised the money from two investors. The company did not specify what the proceeds would be used for.

This contribution follows the $425,301 raised in equity by the company in January 2018.

Piedmont Stone Center uses extracorporeal shock wave lithotripsy, an alternative to surgical kidney stone removal, to target kidney stones in patients.

Using shock waves from outside of the body, the lithotripsy procedure causes the stone to be broken into tiny pieces.

While surgical removal of kidney stones may result in an extended hospital stay and recovery taking up to six weeks, with Lithotripsy, an overnight stay in the hospital is not normally required and recovery time typically takes one to three days.

The Piedmont Stone Center was incorporated in 2005.

The company has facilities in North Carolina and Virginia.

Companies relying on a Reg D exemption do not have to register their offering of securities with the SEC, but they must file what’s known as a Form D electronically with the SEC after they first sell their securities.