I just saw your comment and am wondering what you think of the BiWaze. I participated in a demonstration with my medical equipment supplier and a rep for BiWaze just yesterday. It seemed to work well as a replacement for my vest that I have had for 5 years. My pulmonary doc has agreed to prescribe, so the device is on order for me to "rent" and paid by Medicare. I do not know how the long the process will take to receive it. Good luck in your efforts; hoping this will do the job.