Peritoneal Dialysis Patient Line With Dual-Pathway Filter Drainage
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Solution Overview
Problem
Existing medical fluid delivery systems, particularly in peritoneal dialysis, face challenges in ensuring the quality and purity of treatment fluids prepared online or at the point of use, with contaminants often introduced during tubing connections and mixing processes.
Innovation Solution
A medical fluid delivery system with a sterilizing filter in the patient line that filters fresh fluid before infusion and bypasses used fluid to prevent contamination, using a dual-pathway system with check valves to ensure only fresh fluid reaches the patient and used fluid is diverted away, ensuring the filter remains unobstructed and effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pathway filter is used in the patient line, then fluid filtration is simple, but used fluid clogs the filter and cannot be drained
Solution Approach 1:
The filter is divided into two separate pathways: a first pathway for fresh fluid delivery that includes the filter membrane, and a second pathway for used fluid drainage that bypasses the filter membrane. This segmentation allows each pathway to perform its specific function without interference, resolving the contradiction between simple filter structure and reliable fluid drainage.
Solution Approach 2:
A one-way valve is introduced as an intermediary component to control fluid direction. The one-way valve allows fresh fluid to pass through the filter while preventing used fluid from entering and clogging the filter membrane. This intermediary enables the filter to maintain its filtering function while allowing continuous drainage of used fluid.
2Reliability
If fresh and used fluid pathways are separate, then filter clogging is prevented, but system complexity increases
Solution Approach 1:
The filter housing serves multiple functions: it houses both the first pathway with the filter membrane and the second bypass pathway, and contains the one-way valve mechanism. This multi-functionality reduces overall system complexity by consolidating components into a single integrated unit rather than requiring separate systems for filtration and drainage.
Solution Approach 2:
The filter assembly merges the filtration function (first pathway) with the drainage function (second pathway) into a single component. The one-way valve is integrated within the filter housing, combining what could be separate components into one unified device, thereby maintaining reliability while minimizing added complexity.
3Adaptability or versatility
If online fluid mixing is used, then treatment flexibility is improved, but contamination risk increases
Solution Approach 1:
The filter is positioned to filter fresh fluid before it is infused into the patient, performing preliminary purification of the treatment fluid. This preliminary action removes contaminants that may have been introduced during online mixing and tubing connections, allowing flexible fluid preparation while maintaining patient safety.
Solution Approach 2:
The filter uses a disposable membrane that can be discarded after use, eliminating the need for complex sterilization and maintenance of the filtration system. This allows for flexible online fluid mixing with disposable components that ensure contamination-free treatment while being cost-effective and easy to replace.
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, maintaining fluid purity and preventing reinfusion of used fluid, thereby enhancing patient safety and system reliability.
Implementation Method 1
a filter having a membrane configured to filter the treatment fluid
Implementation Method 2
a one-way valve located at an exit end of the first fluid pathway, the one-way valve positioned and arranged to prevent fluid flowing in the second direction from reaching the membrane
Data Source
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AI summary
A medical fluid treatment system includes a source of purified water; at least one concentrate for mixing with the water from the source to form a treatment fluid; a disposable set including a pumping portion, a concentrate line in fluid communication with the concentrate source and the pumping portion, and a patient line in fluid communication with the pumping portion, the patient line including a filter having a membrane configured to filter the treatment fluid, the filter configured such that (i) fresh treatment fluid flowing from the pumping portion towards a patient flows through the membrane and (ii) used treatment fluid flowing through the filter from the patient to the pumping portion bypasses the membrane; and a medical fluid delivery machine including a pump actuator operable with the pumping portion of the disposable set.