Hydrogel-Based Dwell Time Indicator for Peritoneal Dialysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current peritoneal dialysis systems lack an efficient method to optimize and control the dwell time of dialysis solution within the patient's peritoneal cavity, leading to suboptimal waste removal and excess water management, especially in manual CAPD treatments where patients struggle to determine when to end the dwell phase without automated feedback.
Innovation Solution
A hydrogel material that expands predictably with absorbed dialysis fluid, equipped with electrical contacts, is used to trigger a signal or alarm when the optimal dwell time is reached, allowing for automatic switching to the drain phase without requiring a power source, and can be integrated into APD machines or CAPD disposable sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual timing method is used for dwell phase, then device complexity is reduced, but measurement precision of dwell time is insufficient
Solution Approach 1:
The hydrogel material serves itself as both the timing mechanism and the indicator. It automatically absorbs dialysate fluid during the dwell phase, expands predictably over time, and triggers an electrical signal when optimal dwell time is reached, eliminating the need for external power sources or complex electronic timing systems
Solution Approach 2:
The patent changes the physical state of the hydrogel material from compressed to expanded as it absorbs dialysate fluid. This parameter change (volume expansion) is directly correlated with time elapsed during the dwell phase, providing a natural, passive timing mechanism that improves measurement precision without adding system complexity
2Ease of operation
If automated feedback system is implemented, then dwell time control is improved, but device complexity increases
Solution Approach 1:
The hydrogel material provides automatic feedback by expanding in response to absorbed dialysate and triggering an electrical signal when optimal dwell time is achieved. This feedback mechanism guides the patient to drain the dialysate at the correct time, improving ease of operation without requiring complex automated control systems
Solution Approach 2:
The hydrogel material acts as an intermediary between the dialysate fluid and the electrical signaling system. It absorbs the dialysate, translates the absorption into mechanical expansion, and converts this expansion into an electrical signal that triggers the alarm, simplifying the overall control system
3Ease of operation
If power-independent alert mechanism is used, then ease of operation is improved, but reliability of timing may be compromised
Solution Approach 1:
The hydrogel material undergoes a phase transition from a compressed state to an expanded state as it absorbs dialysate fluid. This physical transformation is driven by osmotic pressure and hydrogel swelling properties, providing a reliable, passive timing mechanism that does not depend on external power sources
Solution Approach 2:
The patent replaces traditional mechanical or electronic timing systems with a chemically-driven hydrogel expansion mechanism. The hydrogel's absorption of dialysate fluid creates a predictable expansion that mechanically triggers an electrical signal, providing reliable timing without requiring batteries or complex electronic components
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 enables precise timing of the dwell period, ensuring efficient waste removal and ultrafiltration, while providing a power-independent alert mechanism for patients performing CAPD, optimizing dialysis efficiency and patient compliance.
Implementation Method 1
The dialysate contacts the patient's peritoneal membrane in the peritoneal cavity. Waste, toxins and excess water pass from the patient's bloodstream through the peritoneal membrane and into the dialysate. The transfer of waste, toxins, and water from the bloodstream into the dialysate occurs due to diffusion and osmosis
Implementation Method 2
The transfer of waste, toxins, and water from the bloodstream into the dialysate occurs due to diffusion and osmosis
Implementation Method 3
a material is used, such as a hydrogel material, which increases in volume in a controlled and predictable way as the material absorbs water or dialysis fluid over time
Data Source
AI summary
A dialysis apparatus includes a housing; a first electrical contact carried by the housing; a hydrogel material located within the housing; a second electrical contact connected to the hydrogel material, the hydrogel material located so as to be contacted by a liquid flowing through the housing; and wherein the hydrogel material expands as the material absorbs the liquid such that the second electrical contact is moved and eventually engage the first electrical contact.