Peritoneal Dialysis Effluent Optical Detection for Early Peritonitis
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Solution Overview
Problem
Current methods for detecting peritonitis in patients undergoing peritoneal dialysis are often delayed, relying on laboratory tests that are not immediate and can lead to undue patient distress, as existing onsite detection methods, such as reagent test strips and light-based turbidity detection, are not reliable for early-stage detection.
Innovation Solution
An automated system for peritoneal dialysis machines that uses an illumination source and detector to analyze the optical characteristics of peritoneal effluent at a cellular scale, distinguishing white blood cells and other components based on scattering events, allowing for early detection of peritonitis by monitoring changes in cell counts and trends over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard laboratory tests (Gram stain, cell count, culturing) are performed, then diagnostic accuracy is improved, but detection time is delayed until patient presents with symptoms
Solution Approach 1:
The patent replaces manual laboratory mechanical testing procedures (Gram stain, cell count by microscopy, culturing) with an automated optical detection system that uses light scattering measurements to detect white blood cells and diagnose peritonitis, enabling immediate detection without laboratory processing delays
Solution Approach 2:
The detection system is integrated directly into the peritoneal dialysis machine, allowing the machine itself to perform diagnostic detection of peritonitis through automated optical sensing of the dialysis fluid, eliminating the need for separate laboratory testing
2Loss of time
If reagent test strips are used for immediate detection, then detection time is reduced, but reliability is insufficient for early stage detection
Solution Approach 1:
The patent replaces chemical reagent test strip methods with an optical detection system that measures light scattering properties of cells in the dialysis fluid, providing more reliable and quantitative detection of white blood cells in early stage peritonitis
Solution Approach 2:
The patent uses light scattering as an intermediary physical phenomenon to detect the presence and concentration of white blood cells, providing a more sensitive and reliable indicator of early stage peritonitis compared to chemical test strips
3Extent of automation
If light-based turbidity detection is used, then automated detection is enabled, but signal-to-noise ratio is poor reducing reliability
Solution Approach 1:
The patent measures light scattering at specific angles (particularly side-scattering at 90 degrees) rather than overall turbidity, allowing differentiation of white blood cell signals from background noise and improving the signal-to-noise ratio for automated detection
Solution Approach 2:
The patent changes the measurement parameter from overall light transmission/turbidity to angular-resolved light scattering intensity, enabling better discrimination of cellular components and improving detection reliability in automated systems
4Ease of operation
If patients manually inspect effluent for turbidity, then simple detection method is used, but detection is delayed and unreliable for blind or visually impaired patients
Solution Approach 1:
The patent replaces manual visual inspection by patients with automated optical sensing integrated into the dialysis machine, eliminating the need for patient visual assessment and providing reliable detection regardless of patient vision capabilities
Solution Approach 2:
The system performs self-detection of peritonitis through automated optical sensors in the dialysis machine that independently monitor the dialysis fluid for signs of infection without requiring patient intervention or observation
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
Enables early and reliable detection of peritonitis, reducing patient distress and potentially fatal complications by providing immediate alerts through visual, audible signals, or system interrupts when changes in white blood cell counts or trends indicate the onset of peritonitis.
Implementation Method 1
the detector is arranged to detect illuminant scattered by the effluent. The detector detects that scattered illuminant at a cellular scale of resolution
Data Source
AI summary
The invention provides, inter alia, automated medical methods and apparatus that test PD effluent in a flow path (e.g., with an APD system or CAPD setup) to detect, for example, the onset of peritonitis, based on optical characteristics of the effluent resolved at cellular scales of distance. For example, according to one aspect of the invention, an APD machine includes, in an effluent flow path, apparatus for early stage peritonitis detection comprising an illumination source and a detector. The source is arranged to illuminate peritoneal effluent in a chamber that forms part of the flow path, and the detector is arranged to detect illuminant scattered by the effluent. The detector detects that reflected or scattered illuminant at a cellular scale of resolution, e.g., on a scale such that separate cellular-sized biological (or other) components in the effluent can be distinguished from one another based on scattering events detected by the detector.