Fluid Pump Height Correction for Surgical Pressure Accuracy
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Solution Overview
Problem
Existing medical fluid pumps lack a method to accurately determine the difference in height level between the pump and the patient's body cavity, leading to incorrect pressure measurements and potential tissue damage during minimally invasive surgeries.
Innovation Solution
A method that uses pressure sensors to measure the hydrostatic pressure in the fluid line, combined with torque measurements from the pump's motor, to determine the patient's height level relative to the pump, thereby correcting pressure measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pump is positioned at a different height level than the body cavity, then the pump can be placed in a convenient position for surgery, but the pressure measurement becomes inaccurate due to hydrostatic pressure differences
Solution Approach 1:
The system continuously monitors pressure measurements and uses feedback control to compensate for hydrostatic pressure errors. The controller adjusts the pump output based on the measured height difference and corresponding hydrostatic pressure calculation, ensuring accurate cavity pressure regulation despite pump positioning variations.
Solution Approach 2:
The system changes the reference parameter for pressure measurement by calculating and applying a correction factor based on the vertical distance between the pump and body cavity. This parameter adjustment compensates for hydrostatic pressure effects, allowing accurate pressure control regardless of pump position.
2Measurement precision
If a pressure sensor is placed in the body cavity to measure actual pressure, then measurement accuracy improves, but the risk of contamination and space requirements increase
Solution Approach 1:
The system introduces an intermediary calculation method that uses the known vertical distance between the pump and body cavity to determine hydrostatic pressure. This intermediary approach allows indirect measurement of cavity pressure through pump pressure measurements plus calculated correction, eliminating the need for physical sensors in the sterile field.
Solution Approach 2:
The patent replaces the mechanical/physical pressure sensor in the body cavity with a computational approach. Instead of using a physical sensor that requires placement in the cavity, the system uses mathematical calculation based on fluid mechanics principles (hydrostatic pressure) to determine the correction factor, substituting physical measurement with computational analysis.
3Ease of operation
If the pump is positioned far from the body cavity to allow surgical access, then surgical accessibility improves, but the height difference increases causing larger pressure measurement errors
Solution Approach 1:
The system performs preliminary measurement of the vertical distance between the pump and body cavity before surgery begins. This advance measurement allows the controller to pre-calculate the hydrostatic pressure correction factor, ensuring accurate pressure control is established before surgical procedures commence, regardless of the pump's distant position.
Solution Approach 2:
The vertical distance measurement serves as an intermediary parameter that links pump position to pressure correction. By measuring and using this intermediate value, the system can compensate for any height difference, allowing the pump to be positioned optimally for surgical access while maintaining pressure measurement accuracy through calculation-based correction.
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 method allows for precise regulation of cavity pressure, ensuring safe and effective expansion of body cavities during surgery by accurately accounting for height differences between the pump and the patient.
Implementation Method 1
measure the hydrostatic pressure in the fluid line
Implementation Method 2
combined with torque measurements from the pump's motor
Data Source
AI summary
Subject matter of the invention is a method for determining the difference in height level between a medical fluid pump and the body cavity of a patient for the correction of the measurement of the fluid pressure existing at the outlet end.