There is HeaLight.
https://aytubio.com/healight/
Proof of Concept
An abstract led by the team at Cedars-Sinai Medical Center was published in the United European Gastroenterology Journal, October 2019, titled “Internally Applied Ultraviolet Light as a Novel Approach for Effective and Safe Anti-Microbial Treatment.” Here, the authors show that UVA light exhibits significant in vitro bactericidal effects in an array of clinically important bacteria. Additionally, this is the first study using intracolonic UVA application, which reports that UVA exposure is not associated with endoscopic or histologic injury. These findings suggest that UVA therapy can potentially provide a safe and effective novel approach to antimicrobial treatment via phototherapy on internal organs.
https://www.ueg.eu/education/document/internally-applied-ultraviolet-light-as-a-novel-approach-for-effective-and-safe-anti-microbial-treatment/208958/