Pressure measurement in the extracorporeal blood circuit
An extracorporeal circuit and pressure technology, which is applied in the measurement of fluid pressure, measuring device, and measuring fluid pressure through electromagnetic components, etc., can solve the problems of increased manufacturing and assembly costs, inability to make pressure signal indications, and difficulty in cleaning pressure measurement pipelines. To achieve the effect of reducing air contact, or avoiding air contact, and suppressing the risk of pollution
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no. 1 approach
[0051] overall approach
[0052] figure 1 An example of a pressure profile in millimeters of mercury (mmHg) is shown for a pressure sensor (here a PBE pressure sensor, which is explained in more detail below), where time t is in seconds (s).
[0053] In phase 1, the tube is inserted and filled with fluid into two clamping devices, at least one pressure sensor is integrated into each of the two clamping devices and the pressure is measured in the form of a force signal at the dialysis machine . The tubing system is filled by varying the flow pump speed of at least one pump. During this phase, the machines and pipes are also leak tested.
[0054] In phase 2, the pressure in the tube is kept constant. After a brief stabilization phase, already described step a) is performed for regression analysis and prediction of at least one correction function for finding a correction signal for correcting the drift signal using the corresponding pressure reference signal. In step a), th...
no. 2 approach
[0124] The second embodiment is similar to the first embodiment, so only the differences from the first embodiment are explained below.
[0125] The reference pressure measurement of the pressure signals PBE and PA in step c) (during treatment) can also be performed using the venous clamp SAKV and the arterial clamp SAKA as an alternative to the method described in the first embodiment.
[0126] To this end, as in the exemplary first configuration, the dialyzer flow is switched to a bypass and the tube clamps SAKV and SAKA are closed. Forms a pressure-tight connection in the tube. Stop the blood pump BP. However, due to the delay, the blood pump BP continues to rotate for a short time after it stops, so that the arterial part develops a negative pressure, and the venous part develops a positive pressure, and both have the same pressure ratio relative to each other over time . The PBE pressure signal is calibrated using a PV pressure reference sensor. The PA pressure signal...
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