APD Cassette Pressure Sensing With Flexible Sheet Preconditioning
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Solution Overview
Problem
Existing automated peritoneal dialysis (APD) systems face issues with pneumatic cassette sealing delays, acoustic noise, and user dissatisfaction due to manual intervention and supply management, necessitating an improved APD machine.
Innovation Solution
A peristaltic pump-based APD system with a disposable cassette and integrated peristaltic pump actuator, featuring a user-friendly interface, color-coded bag markers, and automated fluid management, including a moveable raceway and pinch valve actuators for efficient dialysis fluid handling and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If pneumatic cassette sealing is used in automated peritoneal dialysis systems, then automated fluid management is achieved, but sealing delays and acoustic noise occur
Solution Approach 1:
The patent extracts the pneumatic sealing mechanism from the system and replaces it with a manual disconnect design. The disposable cassette is designed to be easily disconnected from the cycler without requiring pneumatic sealing, thereby eliminating sealing delays and acoustic noise while maintaining automated fluid management during the treatment period.
Solution Approach 2:
The system is segmented into a reusable cycler unit and a disposable cassette. The disposable cassette contains all fluid path components and is designed for single-use, eliminating the need for repeated sealing operations. This segmentation allows automated fluid management during use while avoiding the sealing delays associated with reusable systems.
2Extent of automation
If pneumatic cassette sealing is used in automated peritoneal dialysis systems, then automated fluid management is achieved, but acoustic noise increases
Solution Approach 1:
The patent removes the pneumatic sealing mechanism that generates acoustic noise and replaces it with a manual disconnect design. The disposable cassette connects to the cycler without requiring pneumatic actuation, thereby eliminating the source of acoustic noise while preserving automated fluid management capabilities during treatment.
3Device complexity
If manual intervention is required for supply management, then system complexity is reduced, but user dissatisfaction increases
Solution Approach 1:
The system employs a disposable cassette that is pre-filled and pre-configured with all necessary fluid paths and connections. The cassette is designed to be self-contained and self-explanatory with color-coded markers, allowing users to easily load and disconnect without requiring complex manual intervention or supply management skills, thereby improving user satisfaction while maintaining reasonable system complexity.
Solution Approach 2:
The patent implements color-coded markers on the disposable cassette and corresponding receptacles to guide users during loading and disconnect operations. This visual guidance system simplifies the user interface, reduces errors, and improves ease of operation without adding mechanical complexity to the system.
4Device complexity
If patients manually handle drain bags at the end of treatment, then device complexity is reduced, but ease of operation worsens
Solution Approach 1:
The patent extracts the drain bag handling function from manual patient operation and integrates it into the disposable cassette design. The cassette is pre-configured with drain connections and fluid paths, allowing patients to simply disconnect the entire cassette from the cycler without needing to manually handle or transfer drain bags, thereby improving ease of operation while maintaining reasonable device complexity.
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 enhances user experience by automating fluid handling, reducing noise, and optimizing supply management, allowing patients to disconnect easily at the end of treatment without manual handling of drain bags.
Implementation Method 1
A peristaltic pump actuator of the cycler is provided
Implementation Method 2
A pressure sensor of the cycler is provided
Data Source
AI summary
A medical fluid system includes a medical fluid pump actuator; a medical fluid carrying set including a flexible sheet; a temperature sensor positioned and arranged to sense a temperature of the medical fluid flowing through the medical fluid carrying set; a pressure sensor positioned and arranged to contact the flexible sheet when the medical fluid carrying set is loaded for operation with the medical fluid pump actuator; and a control unit configured to (i) precondition the flexible sheet for operation with the pressure sensor by causing the medical fluid pump actuator to apply pressure to the flexible sheet and (ii) use an output from the temperature sensor in a compensation algorithm that modifies an output from the pressure sensor.