Static Patient Pressure Measurement in Peritoneal Dialysis
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Solution Overview
Problem
During peritoneal dialysis, existing methods fail to accurately determine static patient pressure due to interference from dynamic pressure components, particularly when the patient line is kinked or closed, leading to potential risks for the patient.
Innovation Solution
An apparatus with a pressure chamber and a control unit that builds up a measurement pressure and opens a blocking element to isolate the patient line, allowing for the measurement and evaluation of static pressure, enabling detection of line closures or kinks and adjusting suction pressure accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pump is stopped and pressure is measured to determine static patient pressure, then the static pressure portion can be detected, but the measurement is falsified when the patient line is closed or kinked
Solution Approach 1:
The system performs a preliminary pressure build-up phase before the actual measurement. A blocking element is closed and pressure is built up in an isolated pressure chamber to a predetermined measurement pressure. This preliminary action ensures that when the blocking element is subsequently opened for measurement, the pressure can be reliably applied to the patient line regardless of its initial state, enabling accurate static pressure determination even when the line was previously closed or kinked.
2Adaptability or versatility
If suction pressure is increased to compensate for assumed large vertical difference, then the pump can handle perceived patient position, but patient safety is compromised due to falsified pressure values
Solution Approach 1:
The system uses feedback from the pressure measurement to correctly determine patient position and adjust suction pressure accordingly. By measuring the actual static patient pressure after building up pressure in the isolated chamber and opening the blocking element, the system receives accurate feedback about the vertical difference between patient and pump. This prevents falsified pressure values from triggering incorrect suction pressure adjustments, thereby eliminating the safety risk while maintaining adaptability to actual patient position.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate determination of static patient pressure, preventing misinterpretation of line closures and ensuring safe operation by differentiating between free and obstructed patient lines, thereby optimizing pump suction pressure.
Implementation Method 1
the control unit is configured such that it effects a pressure build-up in the pressure chamber to a measurement pressure in a first step
Implementation Method 2
with a pressure measurement device furthermore being provided that is arranged such that it measures the pressure in the pressure chamber or a pressure correlated with it
Implementation Method 3
a blocking means, in particular a valve by which the patient line is blockable
Data Source
AI summary
The present invention relates to an apparatus for determining the static patient pressure, wherein the apparatus comprises a pump in communication with a patient line for conveying a dialysis solution into the abdomen of the patient, and blocking means, in particular a valve by which the patient line is blockable, wherein the apparatus has a pressure chamber that is in fluid communication with the patient line with an open blocking element, with a pressure measurement device furthermore being provided that is arranged such that it measures the pressure in the pressure chamber or a pressure correlated with it; and wherein the apparatus comprises a control unit that is configured such that it effects a pressure build-up in the pressure chamber to a measurement pressure in a first step and opens the blocking element in a second step so that the patient line or a part section thereof is acted on by the measurement pressure of the pressure chamber and with the apparatus having an evaluation unit that evaluates the measured pressure after the opening of the blocking element.