In a printing system, a document data transmitting unit transmits document data generated by a document generating device, to a document storing device. The method comprises the steps of: forming an oxide film on a silicon substrate, forming a polysilicon electrode film on the oxide film, and supplying deuterium ions by an ion implanter on the interface of the oxide film 4 and the silicon substrate via the polysilicon electrode film. The most reliable leak detection method known is the detection of infiltrated air in a blood line, but this only works in blood lines under negative pressure. The bladder is positionable within the helmet so as to substantially wrap around side portions of the cranium, temple areas of the cranium, a rear occipital protuberance portion of the cranium and an upper portion of the cranium without compromising the fluid flow path. Another suture strand extends between a proximal button and distal button of the deployed assembly to maintain the doughnut-shaped bundle structure.