Peritoneal Dialysis System Using Pressure Feedback for Exchange Control
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Solution Overview
Problem
Current peritoneal dialysis systems lack an evidence-based method to determine optimal exchange parameters such as time, volume, and formulation for Tidal Peritoneal Dialysis, leading to inefficiencies, patient discomfort, and increased costs due to the inability to accurately assess ultrafiltrate production and cavity emptiness.
Innovation Solution
A system with on-board sensors and a microprocessor that measures pressure changes to differentiate between ultrafiltrate-induced pressure and other factors, allowing for real-time adjustment of exchange points and fluid management, combining Tidal and Batch modalities to optimize treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed Dwell time is allocated for every given cycle, then the treatment protocol is simple to implement, but the system cannot accurately determine when ultrafiltration has ceased, leading to enhanced glucose absorption
Solution Approach 1:
The system continuously monitors intra-abdominal pressure during the Dwell phase and uses this feedback to detect when ultrafiltration has ceased. The pressure sensor provides real-time data to the microprocessor, which automatically terminates the Dwell phase at the optimal moment, eliminating the need for fixed time allocations and preventing glucose reversal.
2Duration of action of moving object
If the Dwell is allowed to proceed beyond the point when ultrafiltration has ceased, then the treatment duration is extended, but there is a danger of enhanced absorption of Glucose
Solution Approach 1:
The pressure monitoring system provides continuous feedback during the Dwell phase, enabling the microprocessor to detect the precise moment when ultrafiltration ceases and automatically terminate the phase. This feedback mechanism prevents both under-treatment and glucose reversal, optimizing the Dwell duration dynamically.
3Object-affected harmful factors
If the Dwell is terminated prematurely, then glucose absorption is prevented, but the patient does not receive the target dosage
Solution Approach 1:
The system uses pressure feedback to detect the exact moment when ultrafiltration stops, ensuring the Dwell phase continues long enough to achieve complete ultrafiltration and target dosage delivery, but terminates immediately when this goal is achieved, preventing both under-treatment and glucose reversal.
4Device complexity
If the drain volume is calculated based on an estimate of the expected UF, then the calculation is simple, but the likelihood of Drain pain occurs when the cavity is empty
Solution Approach 1:
The system uses real-time pressure feedback during the Drain phase to detect when the peritoneal cavity becomes empty. The microprocessor automatically terminates the Drain phase at this point, preventing the harmful effect of attempting to drain an already empty cavity, which causes patient discomfort. This eliminates the need for complex predictive calculations.
5Measurement precision
If on-board pressure sensors and microprocessor control are implemented, then evidence-based determination of exchange parameters is achieved, but the device complexity increases
Solution Approach 1:
The system uses the patient's own physiological pressure changes as the measurement signal, requiring only a simple pressure sensor and microprocessor to automatically perform measurements, calculations, and treatment adjustments. This self-service approach achieves precise evidence-based control without requiring complex external monitoring equipment or manual interventions.
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 approach enables evidence-based determination of exchange points, reduces patient discomfort, and optimizes treatment efficiency by accurately measuring ultrafiltrate production and cavity emptiness, thereby improving the quality and duration of dialysis.
Implementation Method 1
the peritoneal membrane of the patient's abdominal cavity as a filter to remove toxins via specialized solutions called dialysates
Implementation Method 2
the majority of the cleansing process takes place during the Dwell. It is this phase that removes the waste products, known as the Ultrafiltrate (UF), from the blood
Implementation Method 3
A system with on-board sensors and a microprocessor that measures pressure changes to differentiate between ultrafiltrate-induced pressure and other factors
Data Source
Figure 1A~1C
Figure 1D
Figure 2
AI summary
The invention relates to a system of performing an evidence Dialysis modality of Batch, Tidal or a combination of both. The system: isolates cavity volume changes due only to ultrafiltrate; determines the volume of a patient cavity; determines a full cavity; determines an objective time to initiate an exchange; and determines an empty cavity. One or more combination of these features provide for evidence base Fill, Dwell, and Drain sequences. The system comprises: a cassette having a heated region and a sensor region for measurements. A valve manifold supplies a patient connection with fluid. A microprocessor receives pressure measurements, controls the heated region and activates a volumetric pump to deliver or extract discrete increments of the fluid to the cassette from bags. Filtering pressure measurements to remove rapid fluctuations determines an accumulated pressure in the patient cavity. The volume of fluid in the patient cavity correlates to the accumulated pressure.