Peritoneal Dialysis Pressure Control via Feedback Sensors
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Solution Overview
Problem
Existing peritoneal dialysis systems face challenges in accurately controlling peritoneal cavity pressure during fill cycles, which can lead to over-pressurization and errors in fluid balance calculations.
Innovation Solution
The implementation of an automated peritoneal dialysis system with integrated pressure sensors at both ends of the fluid circuit, allowing for real-time pressure monitoring and feedback-controlled flow regulation to maintain safe pressure levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a dialysate container is elevated to determine fill pressure by height difference, then the fill pressure is automatically controlled, but the system cannot prevent over-pressurization caused by patient-cycler level differences and introduces errors in fluid balance calculation
Solution Approach 1:
The system incorporates pressure sensors that continuously monitor the actual pressure in the peritoneal cavity during fill cycles. The controller receives this feedback and dynamically adjusts the pump operation to maintain pressure within safe limits, preventing over-pressurization regardless of patient-cycler level differences. This closed-loop feedback mechanism resolves the reliability issue while maintaining ease of operation.
Solution Approach 2:
The patent replaces the purely mechanical gravity-based pressure control system with an integrated sensor-controller-pump system. Instead of relying solely on container elevation and fluid column height, the system uses electronic pressure sensors and controlled pumping to achieve precise pressure regulation, eliminating the errors introduced by variable patient-cycler level differences.
2Extent of automation
If automated pumps are used to control fill volume, then the treatment can be automated, but the system is not foolproof against over-pressurization from fluid column height
Solution Approach 1:
The automated pump system is enhanced with real-time pressure feedback from sensors positioned to monitor peritoneal cavity pressure. The controller continuously compares actual pressure against safety thresholds and dynamically adjusts pump speed or stops infusion when limits are approached, ensuring reliable pressure control while maintaining full automation of the dialysis treatment.
Solution Approach 2:
The system performs preliminary pressure assessment before and during fill cycles. Pressure sensors detect potential over-pressurization conditions in advance, allowing the controller to preemptively adjust pump operation or terminate filling before dangerous pressure levels are reached, making the automated system foolproof against over-pressurization.
3Adaptability or versatility
If fill volume is regulated based on prescription, then the treatment is customized to patient needs, but errors in prescription or implementation can detrimentally affect patient health
Solution Approach 1:
The system implements real-time pressure feedback monitoring that overrides or adjusts prescription-based fill volumes when safety limits are approached. Even if the prescription calls for a specific fill volume, the pressure sensors and controller ensure that actual pressure remains within safe boundaries, providing a safety layer that prevents harmful errors in prescription implementation while maintaining treatment customization.
Solution Approach 2:
The system establishes safety margins and pressure thresholds beforehand that act as cushions against prescription errors. The controller is programmed with maximum safe pressure limits and will terminate or adjust filling before dangerous conditions can develop, even when prescription parameters are incorrect or suboptimal for the patient's current condition.
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 solution ensures accurate and safe peritoneal dialysis by preventing over-pressurization and improving the precision of fluid balance calculations, thereby enhancing patient safety and treatment efficacy.
Implementation Method 1
a pressure sensor in contact with a fluid circuit at the cycler has been described. The sensor indicates the pressure at the proximal end of the fill/drain line.
Implementation Method 2
Osmosis exchange with the patient's blood occurs across the peritoneal membrane, removing urea and other toxins and excess water from the blood.
Implementation Method 3
The removal of excess water results in a higher volume of fluid being removed from the patient than is infused. The net excess is called ultrafiltrate, and the process of removal is called ultrafiltration.
Data Source
AI summary
A treatment device system includes a treatment machine for generating a custom peritoneal dialysis solution and has at least one fluid conveyor. The treatment machine has a controller with a first memory and is configured to produce the custom peritoneal dialysis solution by causing the fluid conveyor to mix purified water and at least one concentrate. A water purifier is in fluid communication with, and provides the purified water to, the treatment machine. The water purifier has an internal central controller to control preparation of the purified water, the internal central controller having a second memory. Further, the controller of the treatment machine transmits data, based on a prescription sent from a server to the treatment machine, via a wired or wireless control line to the internal central controller of the water purifier.