Medical Pump Pressure Control via Mathematical Model
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Solution Overview
Problem
Existing methods for controlling internal body pressure during medical interventions, such as arthroscopy and laparoscopy, face challenges due to the need for additional space and increased infection risk with pressure sensors, and inaccuracies in measuring actual body pressure due to differences between supply line and internal pressure.
Innovation Solution
A mathematical model using a state space representation of the system, including the pump motor, supply line, pressure sensor, and body cavity, estimates internal body pressure without additional sensors by comparing actual and estimated pressures and using feedback to correct observer errors, allowing precise pressure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor is introduced immediately into the body interior, then the measurement precision of internal body pressure is improved, but the device complexity and infection risk increase
Solution Approach 1:
The patent uses the supply line as an intermediary medium to transmit pressure information from the body interior to an external pressure sensor. The mathematical model acts as a mediator that translates the measured supply line pressure into an estimate of the actual body interior pressure, eliminating the need for direct sensor placement while maintaining measurement capability.
Solution Approach 2:
The patent creates a virtual copy of the body interior pressure measurement system through mathematical modeling. Instead of physically placing a sensor in the body cavity, the system creates a computational model that replicates the pressure conditions based on measurements taken from the supply line, providing indirect but accurate pressure information.
2Measurement precision
If a pressure sensor is introduced immediately into the body interior, then the measurement precision of internal body pressure is improved, but the reliability decreases due to increased infection risk
Solution Approach 1:
The supply line serves as an intermediary that allows pressure measurement without direct sensor contact with the body interior. This indirect measurement approach eliminates the infection risk associated with introducing foreign objects into the body cavity while still providing the necessary pressure data through the fluid medium already present in the system.
3Device complexity
If pressure is measured in the supply line, then the device complexity is reduced, but the measurement precision of internal body pressure deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the measured supply line pressure is continuously fed into the mathematical model, which then generates an estimated body interior pressure. This feedback loop allows the system to compensate for the non-linear pressure differences between the supply line and body interior, maintaining measurement precision without increasing device complexity.
Solution Approach 2:
The mathematical model dynamically adjusts multiple parameters including flow speed, line dimensions, and pressure differential coefficients to accurately translate supply line pressure measurements into body interior pressure estimates. By changing and optimizing these parameters in real-time, the system overcomes the inherent inaccuracy of direct supply line pressure measurement.
4Device complexity
If traditional pressure control methods are used, then the device complexity is low, but the productivity and pressure regulation speed decrease
Solution Approach 1:
The patent employs a feedback control system where the estimated body interior pressure is continuously compared against the desired pressure setpoint. The mathematical model dynamically adjusts pump operation parameters based on this feedback, enabling rapid and accurate pressure regulation that responds quickly to changing conditions while maintaining relatively simple device architecture.
Solution Approach 2:
The system transitions from static pressure control to dynamic control by continuously updating the mathematical model parameters and pump operation based on real-time pressure measurements and flow conditions. This dynamic adaptation allows the system to respond rapidly to changing surgical conditions, improving pressure regulation speed without significantly increasing device complexity.
Data Source
AI summary
The present invention relates to a method for controlling the internal body pressure, e.g., the joint pressure using a medical-technical fluid pump, and to a device for carrying out said method.