A flexible, invasive, hand-held endoscopic device assembly intended to deliver microwave energy to tissues for coagulation, whilst allowing injection of a solution (e.g., vasoconstrictive agents) primarily to help control/stop serious bleeds (haemostasis) during endoscopic surgery. It includes a microwave antenna, a port with a distal needle, and proximal handpiece with controls for needle retraction. This is a single-use device.