Ra Medical Systems, Inc. is a medical device company. The Company is focused on commercializing excimer lasers for use in the treatment of dermatological and vascular diseases. It develops, manufactures and markets medical devices targeting the dermatology and vascular specialties. It operates through two segments: the vascular segment and the dermatology segment. The Company’s laser technology is used for the treatment of psoriasis, vitiligo, atopic dermatitis, leukoderma, and peripheral artery disease (PAD). Its Destruction of Arteriosclerotic Blockages by Laser Radiation Ablation (DABRA) is an excimer laser and disposable catheter system treatment of vascular blockages resulting from lower extremity vascular disease. Pharos is its excimer laser device that emits highly concentrated ultraviolet light and is used as a tool in the treatment of dermatological skin disorders.