METHOD AND DEVICE FOR OPTIMIZING THE MEASUREMENT ACCURACY IN VIVO WHEN MEASURING INVASIVE BLOOD PRESSURE USING A FLUID-FILLED CATHETER-MANOMETER SYSTEM

摘要

Method and device for optimizing the measuremant accuracy in vivo when measuring invasive blood. pressure using a fluid-filled catheter- manometer system, comprising: - a catheter (1), filled with a sterile fluid - a pressure line (2) filled with a sterile fluid, having one or more stopcocks or couplings, which is connected to the catheter (1) - a pressure transducer-flush system unit (3), filled with a sterile fluid, connected to the pressure line (2) and also connected to a pressurised storage bag (4) filled with a sterile fluid - a pressure transducer (5), integrated into the pressure transducer- flush system unit (3) and provided with a membrane which converts the pressure signal into an electric signal and transmits said electric signal to a medical signal processing device (6) a flush system (7), integrated into the pressure transducer-flush system unit (3) and ensuring that a continuous flush from the storage bag (4) to the catheter (1) inlet is maintained, provided with a manually operable element for temporarily, briefly opening the flush system and closing it again, or for temporarily opening the flush system for a longer time - a medical signal processing device (6) connected to the pressure transducer (5) characterized in that it comprises a method and device which: - calculates the natural frequency and the damping coefficient of the fluid-filled catheter-manometer system - and, using these data, calculates the dynamic response diagram of the fluid-filled catheter-manometer system - and, using these data, calculates the inverted dynamic response diagram of the fluid-filled catheter-manometer system - and uses said inverted dynamic response diagram as a so-called amplifier, also known as a filter, with which the signal measured by the pressure transducer is processed, before calculating the invasive blood pressure signal and the invasive blood pressure values therefrom.