Protease-Sensing Ocular Inserts for Low-Volume Tear Biomarkers
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Solution Overview
Problem
Current diagnostic methods for ocular biomarkers in tear fluid are time-consuming, require specialized skills, and struggle with low concentration detection due to small sample volumes, making them impractical for widespread clinical use, especially for pathogens like HSV-1, which can cause rapid eye deterioration.
Innovation Solution
A wearable ocular insert with protease-responsive reporters bound to the surface, allowing prolonged exposure and enhanced collection of biomarkers, combined with a lateral flow assay for sensitive detection of pathogens like HSV-1, using antibodies and indicator solutions to increase the signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional diagnostic methods (Schirmer's strip, microcapillary tube, or swab) are used to collect tear fluid, then the collection procedure is simple, but the sample volume is too small (1-10 microliters) to detect low concentration biomarkers effectively
Solution Approach 1:
The ocular insert is worn in advance to collect and concentrate biomarkers from tear fluid over an extended period before diagnostic analysis. This preliminary collection phase allows accumulation of sufficient biomarker quantity (improving parameter 26) while using a simple wearable device rather than complex collection equipment (maintaining parameter 36).
Solution Approach 2:
The invention extracts and isolates specific biomarkers of interest from the complex tear fluid matrix using the ocular insert as a selective collection medium. This extraction process concentrates the target biomarkers (improving parameter 26) while the insert itself remains a simple device without complex mechanisms (maintaining parameter 36).
2Measurement precision
If ELISA or PCR assays are conducted on collected tear fluid, then quantitative or qualitative determination of biomarkers is achieved, but the procedures are time consuming and require specific skills
Solution Approach 1:
The ocular insert performs preliminary concentration and pre-enrichment of biomarkers directly in the eye over wear time, preparing the sample in advance for faster downstream analysis. This preliminary action (improving parameter 28) reduces the time required for subsequent diagnostic procedures (improving parameter 25) by eliminating the need for extensive sample preparation and concentration steps.
Solution Approach 2:
The ocular insert acts as an intermediary device that bridges the gap between simple tear fluid collection and complex laboratory analysis. It pre-concentrates biomarkers in a convenient wearable format (improving parameter 28), enabling faster and more accessible diagnostic testing without requiring specialized laboratory infrastructure (improving parameter 25).
3Measurement precision
If protease-responsive peptides are used as reporters, then pathogen-specific detection is achieved, but the reporter must be incorporated within a complex FRET fluorophore or require separate separation mechanisms
Solution Approach 1:
The invention merges the protease-responsive peptide directly with a simple fluorescent reporter molecule into a unified sensor construct. This combination (improving parameter 28) eliminates the need for complex FRET fluorophores or separate separation mechanisms (reducing parameter 36), creating a straightforward fluorescent sensor that changes emission properties upon protease cleavage.
Solution Approach 2:
The invention replaces complex mechanical or magnetic separation mechanisms with a purely optical detection system based on fluorescence. The protease-responsive peptide is directly coupled to a fluorescent reporter, allowing detection through optical property changes (improving parameter 28) without requiring mechanical separation devices or external magnets (reducing parameter 36).
4Quantity of substance
If non-wearable diagnostic sensors are used, then protease detection can be performed, but the device cannot be worn for extended periods to accumulate sufficient protease for detection
Solution Approach 1:
The ocular insert serves itself by being worn directly in the eye, where it automatically collects and concentrates protease from tear fluid over extended periods. This self-service approach (improving parameter 26) is enabled by the simple wearable design that requires no external power sources or complex mechanisms (improving parameter 33).
Solution Approach 2:
The wearable ocular insert performs preliminary accumulation of protease from tear fluid over an extended wear period before diagnostic readout. This preliminary accumulation (improving parameter 26) is made possible by the convenient wearable design that can remain in place for hours (improving parameter 33), allowing time-integrated collection of sufficient protease quantities.
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 rapid, accurate, and cost-effective detection of ocular pathogens by increasing the concentration and accessibility of biomarkers, facilitating early diagnosis and treatment of infections like HSV keratitis.
Implementation Method 1
each reporter is bound to the ocular insert via a peptide sequence that is selectively cleaved by a targeted protease
Implementation Method 2
The hydrogel may be crosslinked solely by the protease-cleavable peptide
Data Source
AI summary
An ocular insert containing one or more reporters is described. Each reporter is bound to the ocular insert via a peptide sequence selectively cleaved by a targeted protease. Each peptide sequence is hydrolytically stable in tear fluid for at least 30 minutes in absence of the targeted protease. A biocompatible fluid container containing one or more sensors is described. Each sensor contains reporters bound to one or more surfaces contacting the biocompatible fluid and released from the surface when exposed to specific pathogens. A wearable ocular insert directly capturing biomarkers for ocular disease is described. The biomarkers are detected either once released from the ocular insert or directly onto the surface of the ocular insert. A lateral flow device comprising a modified Schirmer's strip and at least one test region is described. The test region comprises immobilized peptides, antibodies or aptamers, and a lateral flow device weighing no more than 4 g.