Medical Fluid Pump Intraoperative Drag Coefficient Determination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for determining resistance coefficients of shaft and endoscope combinations in medical fluid pumps are time-consuming and inefficient, requiring significant fluid usage and unable to perform measurements within the body cavity, leading to prolonged intervention preparation times and potential tissue damage.
Innovation Solution
A method and apparatus that determine resistance coefficients by evaluating pressure behavior during the initial pump start, creating a characteristic curve stored in a memory device, allowing for rapid and accurate estimation of internal body pressure with minimal fluid usage, enabling measurements to be conducted within the body cavity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resistance coefficients are determined using traditional open-flow measurement methods, then measurement accuracy is achieved, but measurement time increases to 15-30 seconds and fluid consumption increases
Solution Approach 1:
The patent applies preliminary action by determining resistance coefficients during the initial pump start-up phase before the actual medical intervention begins. The system performs pressure behavior evaluation and characteristic curve determination during this pre-intervention period, so that when the intervention starts, the resistance coefficients are already known and stored in memory, eliminating the need for time-consuming 15-30 second measurements during the procedure.
Solution Approach 2:
The patent implements continuity of useful action by utilizing the pump's normal operational pressure generation for dual purposes: both for the medical intervention itself and for determining resistance coefficients. The pressure behavior during pump operation is continuously evaluated to extract resistance coefficient data, rather than requiring a separate dedicated measurement phase, thereby making the measurement process continuous with the treatment process.
2Ease of operation
If traditional open-flow measurement is performed outside the body cavity, then measurement simplicity is maintained, but the method cannot account for actual in-vivo conditions and requires additional fluid usage
Solution Approach 1:
The patent applies universality by making the pump system multi-functional: it serves both as the medical intervention device and as the measurement apparatus. The same pump that delivers fluid during treatment is also used to generate the pressure behavior needed for resistance coefficient determination. This eliminates the need for separate measurement equipment and reduces additional fluid consumption, as the measurement utilizes the pump's normal operational fluid delivery.
3Measurement precision
If resistance coefficients are determined for each instrument change, then accuracy for the specific instrument is ensured, but intervention preparation time increases significantly
Solution Approach 1:
The patent implements self-service by enabling the system to automatically determine and store resistance coefficients for different instruments without requiring manual intervention or separate measurement procedures. When an instrument is connected, the system autonomously performs pressure behavior evaluation during pump start-up, extracts the characteristic curve, determines the resistance coefficients, and stores them in memory, all without physician involvement, thus maintaining accuracy while improving preparation speed.
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
This approach significantly reduces measurement time to around 7 seconds, minimizes fluid consumption, and allows for immediate intervention, maintaining accuracy comparable to existing methods while ensuring safety by not exceeding estimated pressure values.
Implementation Method 1
a liquid flow is generated and the pressure drop relative to the ambient pressure is measured
Implementation Method 2
the data of a pressure sensor that is outside of the respective body cavity, is used as a basis for an estimation of the pressure in the body's interior
Implementation Method 3
the relationship shown in equation 1 will result: Δp=p1−p2
Data Source
AI summary
A medical apparatus for supplying fluids into body cavities includes a controllable fluid pump, a memory device, a feed line, a pressure sensor in the feed line, a medical instrument to be connected to the feed line. The pressure measured by the pressure sensor is an input variable of a mathematical estimation system, which mathematically describes a state space, which estimates the actual pressure in the body cavity and controls the output of the pump by means of this estimated value. The resistance coefficients ζ1 and ζ2 of the medical instrument required for the estimation of the pressure are determined when starting the pump. The pressure behavior is evaluated for a certain time, therefrom a characteristic curve is determined, and the characteristic curve is stored in a memory device of the pump.