Dual-Lumen PD Pressure Sensing for Intraperitoneal Control
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Solution Overview
Problem
Existing automated peritoneal dialysis (APD) systems generate significant disposable waste, requiring cumbersome setup procedures and potential errors due to the use of disposable items like cassettes and tubes, which can be costly and space-consuming.
Innovation Solution
The APD system converts fluid-carrying components into reusable parts that are disinfected after use, minimizing disposable items and using a reusable dialysis fluid pump, heater, and inline filtration to reduce waste and simplify setup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intraperitoneal pressure is monitored continuously during peritoneal dialysis, then patient safety and treatment efficacy are improved, but device complexity and cost increase
Solution Approach 1:
The pressure sensor is integrated into the dialysis fluid container closure system, combining the sealing function with pressure monitoring function in a single integrated component. This eliminates the need for separate pressure monitoring equipment and reduces overall system complexity while enabling continuous intraperitoneal pressure monitoring during peritoneal dialysis treatment
Solution Approach 2:
A membrane seal acts as an intermediary between the dialysis fluid container and the pressure sensor, allowing pressure transmission from the intraperitoneal cavity to the sensor while maintaining fluid isolation. This enables accurate pressure monitoring without direct contact between the sensor and dialysis fluid, simplifying the overall system architecture
2Measurement precision
If pressure sensor is integrated into the dialysis fluid container, then monitoring accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The closure system is divided into distinct functional modules: an outer container closure, an inner seal assembly with membrane, and a pressure sensor assembly. This segmentation allows each component to be manufactured separately using optimized processes, then assembled together, reducing overall manufacturing complexity while maintaining measurement precision
Solution Approach 2:
The pressure sensor system uses a membrane seal that creates a pressure transmission pathway without requiring direct sensor contact with dialysis fluid. This indirect measurement approach simplifies manufacturing by allowing the sensor to be housed in a protected environment while still accurately measuring intraperitoneal pressure through the membrane interface
3Ease of operation
If real-time pressure monitoring is implemented, then treatment control is improved, but data management complexity increases
Solution Approach 1:
The pressure sensor provides real-time feedback on intraperitoneal pressure conditions during dialysis treatment. This feedback is transmitted to the dialysis machine control system, which automatically adjusts treatment parameters or alerts the clinician when pressure thresholds are exceeded, simplifying treatment control while managing data complexity through automated decision-making algorithms
Solution Approach 2:
The pressure monitoring system is integrated into the existing dialysis machine control architecture, allowing the same control system to manage both traditional dialysis parameters and pressure monitoring data. This multi-functional approach eliminates the need for separate data management systems, reducing overall complexity while enabling comprehensive treatment control
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 reduces waste, simplifies setup, and ensures accurate fluid handling with controlled pressure and temperature, providing a cost-effective and efficient APD solution.
Implementation Method 1
the pressure sensor being differentially pressurized by the intraperitoneal pressure
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A peritoneal dialysis ("PD") system includes a housing; a dialysis fluid pump housed by the housing; a dual lumen patient line extending from the housing; a filter set including a final stage filter located along a first line, and which includes a second line in parallel with the first line, the first line in fluid communication with a first lumen of the dual lumen patient line, and the second line in fluid communication with a second lumen of the dual lumen patient line; a pressure sensor located within the housing and positioned so as to sense a static or substantially static PD fluid pressure in the second lumen while fresh PD fluid is pumped through the first lumen and the final stage filter; and a control unit configured to use the sensed static or substantially static pressure in a pressure control routine for the dialysis fluid pump.