A flexible heating tube especially for medical use, e.g. for taking blood away from and returning it to the body, in which a flexible pipe of transparent plastics material is provided with at least one electrical helical resistance heating conductor and at least one helical filiform temperature measuring...http://www.google.com.au/patents/US4038519?utm_source=gb-gplus-sharePatent US4038519 - Electrically heated flexible tube having temperature measuring probe
