Peritoneal Dialysis Patient Line Filtration With Used-Fluid Bypass
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Solution Overview
Problem
Existing medical fluid delivery systems, particularly in peritoneal dialysis, face challenges in ensuring the quality and sterility of treatment fluids prepared online or at the point of use, with potential contamination risks during tubing connections and fluid preparation.
Innovation Solution
A peritoneal dialysis system with a cycler and water purifier, equipped with a control unit and disposable set, includes a patient line filter that separates fresh and used fluid pathways, using hydrophilic membranes and one-way valves to ensure only fresh fluid reaches the patient, while used fluid bypasses the filter, maintaining sterility and preventing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is placed in the patient line to sterilize fresh dialysis fluid, then the sterility and quality of treatment fluid is improved, but the risk of filter clogging by used fluid and toxin removal interference increases
Solution Approach 1:
The filter housing is divided into separate compartments: a fresh fluid compartment with filter membranes for sterilization, and a used fluid compartment with bypass passages. This segmentation allows fresh and used fluids to be processed separately, preventing used fluid from clogging the filter while maintaining sterility of the fresh fluid pathway.
Solution Approach 2:
One-way valves act as intermediaries to control fluid flow direction. The first one-way valve prevents used fluid from entering the fresh fluid compartment, while the second one-way valve ensures fresh fluid flows through the filter membranes. This intermediary mechanism protects the filter system from contamination and clogging while maintaining proper fluid separation.
2Reliability
If used dialysis fluid is filtered to remove contaminants, then fluid quality is improved, but the filter removes toxins that need to be retained in the peritoneal cavity
Solution Approach 1:
The filter housing separates the fresh fluid pathway with filter membranes from the used fluid pathway with bypass passages. This segmentation ensures that only fresh fluid undergoes filtration for sterility, while used fluid bypasses the filter membranes entirely, preventing unintended toxin removal from the peritoneal cavity.
Solution Approach 2:
One-way valves serve as intermediaries to direct used fluid through bypass passages that circumvent the filter membranes. This intermediary flow control mechanism ensures that used fluid does not contact the filter membranes, thereby preventing the removal of toxins that are meant to remain in the patient's peritoneal cavity.
3Ease of operation
If the patient line is kept simple for ease of operation, then device complexity is reduced, but the risk of contamination during tubing connections increases
Solution Approach 1:
The filter housing and one-way valves are pre-assembled as a single integrated unit that connects to the patient line. This preliminary assembly ensures sterility is maintained at the connection point, reducing contamination risk during tubing connections while keeping the overall system simple and easy to operate.
Solution Approach 2:
The one-way valves act as intermediary components that are integrated into the filter housing assembly. These valves provide automatic fluid direction control without requiring complex external mechanisms, maintaining ease of operation while preventing contamination through automated flow management.
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
The system effectively filters contaminants from medical fluids before infusion, ensuring the sterility and quality of treatment fluids, reducing the risk of patient complications and improving the reliability of home-based treatments.
Implementation Method 1
a filter having a membrane configured to filter the treatment fluid
Implementation Method 2
one-way valves positioned and arranged to prevent used treatment fluid returning from the patient from reaching the membrane
Data Source
AI summary
A peritoneal dialysis system includes a cycler configured to pump peritoneal dialysis fluid and a disposable set configured to receive the peritoneal dialysis fluid pumped by the cycler. The disposable set includes a filter having a fresh peritoneal dialysis fluid pathway and a membrane located along the fresh peritoneal dialysis fluid pathway and configured to filter the peritoneal dialysis fluid. The filter also includes a grid housing comprising a plurality of baffles configured to separate filtered fresh peritoneal dialysis fluid that has flowed through the membrane into plural fluid channels that form an interior region of the fresh peritoneal dialysis fluid pathway.