Re-frame the issue: It's not "Patient Restraint", it's "Passenger Safety". What good are the gurney locks in an accident if the patient/passenger isn't held by some sort of safety system just like the crew? It's just happy coincidence that the best places to put gurney belts happen to cross over the patient/passenger at points above the elbow and knee which also happen to prevent him injuring himself when having a seizure... or while trying to kill you. This idea brought to you by overly litigious Americans.