The whole team is in charge of launching a product to a target customer. You gotta to have certain a target customer, people who are willing to use the product. The project manager would then put together all the documents required to get the project going. However, marketing is the team in charge of delivering the message to all the “target customers.” If you don’t have an effective marketing team, you could have a really good product that nobody is willing to buy because no one knows about it.
Additionally, whenever you test the product, you gotta have as many subjects as possible, they all should have different characteristics, weight, height, etc.. If the medical device (let’s say a hip joint prosthesis replacement) reaches succeed, then you can move to the next point of your timeline in the project.