Peritoneal Dialysis Cycler Drainage Breakpoint Control
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Solution Overview
Problem
Current tidal peritoneal dialysis treatments are inefficient due to a second low flow phase during drainage, which wastes time and causes abdominal pain in patients, as the abdominal cavity is not completely emptied, leading to unnecessary suction pressure.
Innovation Solution
A device with a processor and sensor that interrupts the drainage at a breakpoint, allowing a residual volume to remain in the abdominal cavity, optimizing fluid use and reducing treatment time, and adjusting parameters like target volume and dwell time to enhance comfort and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the abdominal cavity is completely emptied during drainage, then the dialysis fluid is fully removed, but the drainage time is excessively long and causes patient discomfort
Solution Approach 1:
The system performs preliminary detection of the breakpoint during the drainage phase, identifying the optimal interruption point before complete emptying occurs. This allows the system to stop drainage at the precise moment when further drainage becomes inefficient, thereby reducing drainage time while maintaining adequate fluid removal.
Solution Approach 2:
The system continuously monitors drainage parameters (flow rate, pressure) and uses this feedback to detect the breakpoint condition. When the breakpoint is detected, the system automatically interrupts drainage, creating a closed-loop control system that optimizes drainage time based on real-time physiological conditions.
2Quantity of substance
If the abdominal cavity is completely emptied during drainage, then all dialysis fluid is removed, but low flow phases cause abdominal pain due to suction pressure
Solution Approach 1:
The system proactively detects the approaching breakpoint through continuous monitoring of drainage parameters and interrupts drainage before the low flow phase begins. This preliminary action prevents the harmful suction pressure from developing, thereby avoiding abdominal pain while still achieving sufficient fluid removal.
Solution Approach 2:
The system uses the natural breakpoint in the drainage curve as a beneficial signal to interrupt drainage. By converting what would normally be a harmful low-flow phase into a useful interruption point, the system eliminates patient discomfort while maintaining effective dialysis fluid removal.
3Loss of time
If the drainage is interrupted at breakpoint with residual volume, then drainage time is reduced, but not all dialysis fluid is removed
Solution Approach 1:
The system dynamically adjusts the drainage strategy by interrupting at the detected breakpoint rather than completing full drainage. This dynamic approach optimizes the trade-off between drainage time and fluid removal efficiency, achieving sufficient dialysis without the diminishing returns of complete emptying.
Solution Approach 2:
The system changes the drainage parameter from complete emptying to breakpoint interruption, fundamentally altering the drainage endpoint. This parameter change reduces drainage time while maintaining adequate fluid removal, as the residual volume at breakpoint is sufficient for effective dialysis.
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
Significantly shortens the drainage period, increases the time for active dialysis, reduces patient discomfort by avoiding low flow phases, and optimizes the use of dialysis fluid and treatment time without requiring specific patient positions.
Implementation Method 1
a sensor connected to the processor and adapted to sense during the draining a variable related to the draining of the dialysis fluid from the abdominal cavity
Implementation Method 2
Each draining is a complete draining, i.e. the abdominal cavity is substantially empty before each new filling of dialysis fluid... the abdominal cavity is filled with dialysis fluid... The drain period Dr, during which the spent dialysis fluid is drained out from the abdominal cavity, exhibits two phases
Implementation Method 3
PD performed with the aid of a cycler is called APD (Automated Peritoneal Dialysis), wherein the cycler performs the successive filling of dialysis fluid and draining of dialysis fluid
Data Source
AI summary
A device and a method for a peritoneal dialysis treatment having several cycles include a cycler controlled by a processor. The cycler fills the abdominal cavity with dialysis fluid, and drains the abdominal cavity. A sensor senses a variable related to the draining of the dialysis fluid. The draining is interrupted when the variable reaches a breakpoint at which the variable is radically changed, thereby leaving the residual volume of fluid.