Device and method for locating anatomical cavity in a body

Assembly for a device for locating a region which is situated in a body, comprising:

• a hollow needle for locating the region;
• a fluid-filled reservoir which is in communication with said needle;
• and
• a pump for pressurizing the fluid;
• a measuring device for creating a pressure-measurement signal which is related to pressure prevailing in the fluid-filled reservoir;
• a signal-converter designed for converting said pressure-measurement signal created by said measuring device into a converted signal which is suitable for further processing;
• and
• a reproduction device designed for processing the converted signal to emit an acoustic signal which is related to the converted signal;
• wherein said converted signal and said acoustic signal are both continuously representative of the instantaneous pressure prevailing in the fluid in order to provide that the acoustic signal is always an acoustic reproduction of the instantaneous pressure prevailing in the fluid such that changes in said pressure directly lead to changes in the acoustic signal.