Althea Medical is a medical device start-up company that develops a catheter-based solution for treating patients with massive and sub-massive pulmonary embolism. The company has developed an over-the-wire novel system, which combines the efficiency of large-bore thrombectomy with an easy-to-use delivery method that minimizes patient risks, and a mechanical clot removal system used for capture and removal of all or most of the thrombus bulk.