A Non-randomized, Open-Label Study to Evaluate the Safety and Effectiveness of the Dayspring Technology for Patients With Breast Cancer Related Lymphedema (BCRL) After Lymphatic Surgery

This study is evaluating a device called Dayspring Technology — a type of compression therapy — in women who have arm swelling (lymphedema) after breast cancer surgery. Researchers want to see if this device is safe and effective when used after lymphatic surgery. **You may be eligible if...** - You are 18 or older - You have been diagnosed with upper arm lymphedema (swelling) following breast cancer treatment - You have had or will have lymphatic surgery with the study's designated surgeon - There is a measurable volume difference of more than 3% between your arms **You may NOT be eligible if...** - You have active or recurring cancer, or completed chemotherapy, radiation, or primary surgery less than 3 months ago - You have an open wound, active skin infection, or conditions that prevent safe device use - You have a blood clot history (DVT or pulmonary embolism) in the past 6 months - You have congestive heart failure, chronic kidney disease, epilepsy, or pulmonary edema - You are pregnant or planning to become pregnant - You have swelling in both arms Talk to your doctor to see if this trial is right for you.