Study on Coronary Sinus Reducer for Refractory Angina

This study checks if a device called the Coronary Sinus Reducer helps people with refractory angina, which is a type of chest pain that doesn't get better with usual medicines. The trial will use a sham-controlled method, meaning some participants will get the real device, and others will get a pretend treatment, but neither will know which they received. The study is for people who can't have other heart procedures like bypass surgery.

• The study lasts 12 months, and participants need to stick with their current medications.
• Participants must be over 18 and agree to follow-ups and tests.
• People with certain conditions, like recent heart issues or severe lung problems, cannot join.

Participants will be assessed to ensure they have the right kind of heart condition for the study. They should also be able to handle some medical tests. This study aims to see if the Reducer can safely help reduce chest pain for those who don't have other treatment options.