As a veterinarian, I have many assistants who I believe could do a great job at this... But I have met equally as many, if not more, that would make me very uncomfortable if they were acting catheters. I think this is something that requires actual training to know why and how and maintenance and managing problems or complications. I also think this would decrease pay for current LVTs who go through rigorous training and would  be able to get cheaply replaced in some practices by "unlicensed" vet techs.