Process and Device to control the internal body pressure during use of a medical-technical pump

A method for determining and controlling the internal body pressure in medical methods comprising the steps of:

• pumping a fluid by a pumping device via a supply line into a body cavity, wherein the fluid is able to flow through a second line out of the body cavity, and wherein the fluid is able to flow through a separate skin incision of the body cavity,
• controlling the pump comprised in the pumping device, wherein an input speed being the effective control variable for a state observer and at least the supply line containing a pressure sensor measuring the pressure in the line, wherein the pressure measured by the pressure sensor is a measurable state variable for calculating an observer error for a state observer, the state observer being described by a state space model, which describes the mathematical-physical relation, which estimates the actual pressure in the body cavity and controls the power of the pump by means of this estimated value.