APD Tubing State Detection for Reliable Priming and Line Connection
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Solution Overview
Problem
The complexity and size of past machines and associated disposables for Automated Peritoneal Dialysis (APD) modalities have deterred widespread patient acceptance, as they are cumbersome and inconvenient compared to manual peritoneal dialysis methods.
Innovation Solution
The development of a tubing state detector system for APD systems, which includes light emitters and sensors to detect the presence or absence of tubing segments and the presence of liquid within them, ensuring proper priming and connection of patient lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If conventional APD machines and disposables are used, then automated peritoneal dialysis treatment can be provided, but the complexity and size of the system increases, making it cumbersome and inconvenient for patients
Solution Approach 1:
The system is divided into separate functional modules: a reusable cycler device that performs automated dialysis operations and a disposable fluid handling cassette that contains all fluid path components (spikes, tubing, connectors). This segmentation allows the complex automated functions to be contained in a compact reusable unit while the disposable unit remains simple and replaceable, reducing overall system complexity for the patient.
Solution Approach 2:
The fluid handling cassette is designed to be inserted into and nested within the cycler device. The cassette contains nested sub-components including spikes within the cassette body, tubing routed through channels, and connectors positioned within the assembly. This nested structure minimizes the overall footprint and makes the system more compact and patient-friendly.
2Ease of operation
If manual peritoneal dialysis methods are used, then the system is simpler and more convenient, but automation and reduced patient burden during waking hours cannot be achieved
Solution Approach 1:
The system enables patients to perform dialysis automatically during sleep without manual intervention. The cycler device autonomously executes the dialysis protocol, and the disposable cassette with pre-attached tubing and connectors requires no assembly or manipulation by the patient, making the automated system as easy to use as manual methods.
Solution Approach 2:
The disposable fluid handling cassette is pre-assembled with all necessary components (spikes, tubing, connectors) before use. The tubing is pre-primed and air-free, and connectors are pre-positioned for automatic connection to the cycler. This preliminary preparation eliminates the need for patient intervention during the dialysis process, maintaining ease of operation while enabling full automation.
3Productivity
If tubing segments are not properly detected, then the system operation continues, but errors occur in priming and connection of patient lines
Solution Approach 1:
Optical sensors provide real-time feedback on tubing segment presence and liquid level in the patient line. The system monitors these parameters continuously and can detect improper priming or connection issues before they affect treatment delivery, ensuring reliable operation while maintaining productive treatment schedules.
Solution Approach 2:
The system replaces manual visual inspection and mechanical checking of tubing priming with an optical detection system. Light emitters and sensors automatically detect the presence of tubing segments and liquid levels, providing more accurate and reliable detection than manual methods while requiring no additional patient time or effort.
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 tubing state detector system enhances the reliability and convenience of APD by ensuring accurate detection of tubing segments and liquid presence, reducing the risk of errors and improving patient safety and experience.
Implementation Method 1
An optical sensor is positioned on a side of the space opposite the first and second light emitters and arranged to receive light emitted by the first and second light emitters to determine a presence or absence of a tubing segment in the space
Implementation Method 2
The optical sensor may be arranged to receive light from the fill state light emitter to determine a presence or absence of liquid in the tubing segment
Data Source
AI summary
A medical treatment system, such as peritoneal dialysis system, may include control and other features to enhance patient comfort and ease of use. For example, a peritoneal dialysis system may include a control system that can adjust the volume of fluid infused into the peritoneal cavity to prevent the intraperitoneal fluid volume from exceeding a pre-determined amount. The control system can adjust by adding one or more therapy cycles, allowing for fill volumes during each cycle to be reduced. The control system may continue to allow the fluid to drain from the peritoneal cavity as completely as possible before starting the next therapy cycle. The control system may also adjust the dwell time of fluid within the peritoneal cavity during therapy cycles in order to complete a therapy within a scheduled time period. The cycler may also be configured to have a heater control system that monitors both the temperature of a heating tray and the temperature of a bag of dialysis fluid in order to bring the temperature of the dialysis fluid rapidly to a specified temperature, with minimal temperature overshoot.