What I found so far is focused ultrasound treatment for heart valve calcifications by Cardiowave, but their treatment is not available for the public yet. They did trials in France and The Netherlands.
Does anyone know similar treatment/ company/ organization / clinic who can be of any help?
There are elements of your relatives case that make adequate commenting very difficult.
For instance, what is their age, what is their leaflet anatomy (bi or tri leaflet), what is the valve area, and is there calcification of the aortic root and what is their NYHA grade.
Aortic stenosis is a condition with high morbidity and mortality if untreated.
Elderly patients can do quite well depending on leaflet anatomy with transcutaneous aortic valve replacement (TAVI) - this is preferred for more elderly patients because the replacement valves don’t last as long as tissue or metallic valves (which last from 10ish to 30ish years respectively).
Due to the high morbidity and mortality associated with it, really the best thing your relative can do is listen to their cardiologist and cardiothoracic surgeon.
No-one really wants to have a zipper or go on bypass and it can be quite confronting but hunting down unproven miracle cures for a procedure that is exceptionally routine and has generally excellent results for patients with minimal comorbidities is a fools errand in my opinion
-The severity of aortic stenosis determines whether any intervention is indicated. Only a cardiologist or cardiac surgeon can reliably make this determination.
-The aortic stenosis procedure with the strongest evidence base is transcatheter aortic valve replacement, or TAVR. See the PARTNER 3 trial, https://www.nejm.org/doi/full/10.1056/NEJMoa1814052
-Bear in mind that only a cardiologist or cardiac surgeon can apply the available evidence to a patient and make a recommendation. In some cases of severe aortic stenosis, despite the PARTNER trials, an open surgical valve repair is still a better option. Only a cardiac surgeon can decide this after reviewing all of a patient's information.
-The evidence base for other interventions is weak. These options should probably not be considered outside of the context of a clinical trial. You can look for clinical trials here: https://clinicaltrials.gov/ct2/home
-Echoing other commenters, you should know that any procedure on the aortic valve has a risk of stroke. This would include any procedure that removes calcifications and possibly releases them into the blood. Only an interventional cardiologist or cardiac surgeon is qualified to discuss these risks in detail.
I guess I just don’t see the reason for pursuing a treatment option outside of what is recommended by a specialist who has assessed the person in question.
I assume that removing a clot in the aortic by ultrasounds could have consequences when the debris accumulate in another part of the blood stream. This technology should be used with great care (probably, I'm not an expert in aortic plumbing) and probably in combination with anticoagulants. Ask a professional about by-pass and valve replacement instead.
Just an opinion. This is not medical advice and your mileage may vary. Think that if something goes wrong you will want a real physician close and the blood resources that only an hospital can provide ready to use.
I think it goes without saying - do your own research and consult a physician. PubMed is a great resource.