Oldelft was founded in 1939 as a company specialized in optics. In the 1980s, the company started with the development of ultrasound probes. Oldelft was the first company to deliver a TEE solution. It has delivered TEE (transesophageal echocardiography) probes to all major ultrasound companies.
In 1998 Oldelft Ultrasound split off from the Oldelft mother company and started operating as a separate business unit within Delft Instruments. In 2019, Smile Invest acquired the majority interest from Gimv.