An intervertebral prosthesis for implantation between adjacent vertebrae of the human spine is shown. The navigation apparatus determines whether a travel condition of the vehicle that is driven by using the sensors disposed in the vehicle, in terms of the driving operation concerning the fuel consumption rate of the vehicle. A removable closure member is mounted on the inlet end portion to close the conduit when not in use or during building construction, so that ingress of material or detritus into the drainage pipe is inhibited. The first layer transmits, when the first layer judges that the packet is to be hopped to the next node, the packet to the next node by making the packet cut through the first layer. Thus, the amount of the pattern data is small even if the repeat times of the timing pulses for one period in the horizontal scanning period are large. A pump is attached to the valve and the pressurized fluid is added to the pressurized fluid section, after which the valve is closed.