A cerebrospinal-fluid-pressure-measuring device , comprising: a pressure gauge including: a hollow cylindrical body configured for inserting through a skull and having a lower end , an upper end , an inner surface, and an outer surface ; a membrane attached to the lower end , the membrane being configured to move under a pressure of cerebrospinal fluid within the skull; and a plurality of coils including a stationary coil and a moving coil , the stationary coil being disposed in the hollow cylindrical body and connected to the inner surface of the hollow cylindrical body so as to remain stationary with respect to the hollow cylindrical body , the moving coil being disposed in the hollow cylindrical body and connected to the membrane so that the moving coil moves with respect to the stationary coil when the membrane moves under the pressure from the cerebrospinal fluid, one of the plurality of coils being configured as a transmitting coil and another of the plurality of coils being configured as a receiving coil; and a control unit configured to contact the upper end of the hollow cylindrical body so as to apply an input signal to the transmitting coil and receive an output signal from the receiving coil in response to the input signal, and to generate an indication of the pressure of the cerebrospinal fluid responsively to the output signal. a pressure gauge including: a hollow cylindrical body configured for inserting through a skull and having a lower end , an upper end , an inner surface, and an outer surface ; a membrane attached to the lower end , the membrane being configured to move under a pressure of cerebrospinal fluid within the skull; and a plurality of coils including a stationary coil and a moving coil , the stationary coil being disposed in the hollow cylindrical body and connected to the inner surface of the hollow cylindrical body so as to remain stationary with respect to the hollow cylindrical body , the moving coil being disposed in the hollow cylindrical body and connected to the membrane so that the moving coil moves with respect to the stationary coil when the membrane moves under the pressure from the cerebrospinal fluid, one of the plurality of coils being configured as a transmitting coil and another of the plurality of coils being configured as a receiving coil; and a hollow cylindrical body configured for inserting through a skull and having a lower end , an upper end , an inner surface, and an outer surface ; a membrane attached to the lower end , the membrane being configured to move under a pressure of cerebrospinal fluid within the skull; and a plurality of coils including a stationary coil and a moving coil , the stationary coil being disposed in the hollow cylindrical body and connected to the inner surface of the hollow cylindrical body so as to remain stationary with respect to the hollow cylindrical body , the moving coil being disposed in the hollow cylindrical body and connected to the membrane so that the moving coil moves with respect to the stationary coil when the membrane moves under the pressure from the cerebrospinal fluid, one of the plurality of coils being configured as a transmitting coil and another of the plurality of coils being configured as a receiving coil; and a control unit configured to contact the upper end of the hollow cylindrical body so as to apply an input signal to the transmitting coil and receive an output signal from the receiving coil in response to the input signal, and to generate an indication of the pressure of the cerebrospinal fluid responsively to the output signal. <EOS>