Clinical Evaluation of the Safety and Performance of Microwave Coagulation Using the HS1 Instrument

Inclusion Criteria: * Patient or authorised representative able to comprehend and sign the Informed Consent form. * Actual or potential non-variceal bleeding in the upper GI, including angiodysplasia or AVM malformations such as Dieulafoy's lesion with a Glasgow-Blatchford score of greater than 1 Exclusion Criteria: * As stated in the contraindications in the HS1 IFU; * Aged \<18 years of age * Those described as vulnerable populations in EN ISO 14155; * Patients with a known coagulopathy (congenital); * Concurrent participation in another experimental intervention or drug study * Unwilling or unable to provide informed consent. * A patient whose Glasgow-Blatchford score is 1 or less