Detachable volume measuring apparatus, tissue expansion apparatus comprising same and breast volume measuring method using same

A tissue expansion apparatus comprising:

• a dome worn on a body tissue of a wearer;
• a suction apparatus configured to generate a negative pressure within the dome;
• and
• a volume measuring apparatus mounted to the suction apparatus and configured to measure a volume of the body tissue received in the dome,
• wherein the suction apparatus includes a pump configured to generate a negative pressure within the dome, a first flow line connecting an interior of the dome to an inflow port of the pump, a second flow line connecting an outflow port of the pump to the external atmosphere, a control valve having a first port connected to the first flow line and a second port connected to the second flow line, and a first control unit configured to control the pump and the control valve, and
• the volume measuring apparatus includes an inlet into which outside air is introduced, an outlet configured to supply the outside air to the second flow line of the suction apparatus, a housing having the inlet and the outlet, a flow line connecting the inlet to the outlet in the housing, first and second pressure sensors provided at two different points of the flow line, and a second control unit configured to output a differential pressure measured by the first and second pressure sensors to the suction apparatus.