Smartphone-Mounted Opto-Mechanical Reader for Phosphate Detection
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Solution Overview
Problem
Current methods for monitoring serum phosphate levels in patients with chronic kidney disease are inadequate, particularly due to the need for frequent administration of phosphate binders and limited access to laboratory-based equipment, leading to poor compliance and infrequent monitoring, which can result in elevated phosphate levels and increased morbidity and mortality.
Innovation Solution
A portable, cost-effective phosphate sensing system that uses a paper-based microfluidic chip and a smartphone-mounted opto-mechanical reader for colorimetric analysis, allowing for point-of-care measurement of serum phosphate levels with a small blood sample volume, enabling frequent and accessible monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laboratory-based photometric and electro-chemiluminescence equipment is used for serum phosphate measurement, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent employs disposable test strips impregnated with colorimetric reagents that react with phosphate in serum samples. These single-use strips eliminate the need for complex, expensive laboratory equipment while providing adequate measurement precision for clinical monitoring. The disposable nature ensures consistency and eliminates calibration requirements.
Solution Approach 2:
The invention replaces complex optical measurement systems (photometers and electro-chemiluminescence equipment) with a simple smartphone-based colorimetric detection system. The smartphone camera captures color changes from the reaction between phosphate and reagents on the test strip, using software algorithms to quantify phosphate levels without requiring sophisticated hardware.
2Reliability
If frequent serum phosphate monitoring is implemented, then patient outcomes are improved, but loss of time and resource requirements increase
Solution Approach 1:
The portable phosphate monitoring system enables patients to perform self-testing at home using minimal sample volumes (a few drops of blood or urine). The automated smartphone-based analysis eliminates the need for laboratory visits, allowing frequent monitoring without significant time investment. Patients can obtain results immediately and adjust their phosphate binder intake accordingly.
Solution Approach 2:
The system uses pre-impregnated test strips with stable colorimetric reagents that require no preparation. Serum or urine samples can be collected at home and analyzed immediately, eliminating the need for prior laboratory scheduling and sample transport. This preliminary preparation of reagents and simplified sampling enables frequent monitoring.
3Measurement precision
If phosphate binder administration frequency is increased, then serum phosphate control is improved, but ease of operation deteriorates due to pill burden
Solution Approach 1:
The portable monitoring system provides immediate feedback on serum phosphate levels, allowing patients and clinicians to adjust phosphate binder dosing in real-time. This feedback loop enables optimization of binder frequency and dosage, potentially reducing the total pill burden while maintaining adequate phosphate control. Patients can see the direct impact of dietary or medication changes on their phosphate levels.
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 provides accurate and reliable measurements of serum phosphate levels, correlating strongly with laboratory tests, facilitating better management of phosphate levels and reducing the risk of cardiovascular complications, especially in resource-limited settings and for patients with chronic kidney disease.
Implementation Method 1
one or more light sources configured to illuminate a test sample holder having assay reagent(s) contained therein and control sample holder disposed in the opto-mechanical reader along an optical path aligned with a camera of the mobile phone
Data Source
AI summary
A portable colorimetric assay system includes an opto-mechanical reader configured to be detachably mounted to a mobile phone having a camera or other camera-containing portable electronic device. The opto-mechanical reader includes one or more light sources configured to illuminate a test sample holder and control sample holder disposed in the opto-mechanical reader along an optical path aligned with a camera of the mobile phone or other camera-containing portable electronic device. One or more serum separation membranes are disposed in the opto-mechanical reader and define a sample receiving pad configured to receive a blood sample. A moveable serum collection membrane is membrane is also disposed in the reader and is configured to contact the sample receiving pad in a first position and moveable to a second position where the serum collection membrane is disposed inside the test sample holder.