Thank you for your assistance. We will try asking more questions the next time this happens. I don't know if the emergency room could give us the name of the manufacturer. I assume that we are "stuck" with whatever brand the hospital purchases. Another type might require surgery if it is available. We were curious to know if this was a problem other people faced but so far no one has replied to say this has happened to them. This tells us that we need to be asking more questions and we will do that.