This study is about testing a device called the Coronary Sinus Reducer for people with a heart condition called refractory angina. Angina is chest pain due to reduced blood flow to the heart, and "refractory" means it doesn't improve with standard treatments. The study will see if the device is safe and works well for people who can't have other treatments like surgery. This study is randomized, which means participants are chosen by chance to get the treatment or not, and it's double-blinded, meaning neither the doctors nor the participants know who gets the actual treatment.
- Duration: Participants will be part of the study for at least 12 months.
- Visits: Regular visits to the clinic will be needed for check-ups.
- Eligibility: Must be 18 or older with specific heart conditions and agree to follow-up visits.
Participating in this study might help improve angina symptoms, but there are risks involved, and not everyone with angina will qualify. You should discuss with your doctor to see if joining this study is right for you.