Lateral Flow Assay for Amniotic Fluid Detection
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Solution Overview
Problem
Current methods for diagnosing premature rupture of membranes (PROM) are inaccurate, leading to high false-negative rates and unnecessary obstetric interventions, which can result in serious maternal and neonatal complications.
Innovation Solution
A lateral flow assay test using a mixture of monoclonal and polyclonal antibodies specific to amniotic fluid proteins, such as PP12 and alpha-fetoprotein, is employed to detect fetal membrane rupture, reducing false negatives to virtually zero by utilizing a swab sample processed in a buffer solution and applied to a test strip with capillary action, providing a timely and accurate diagnosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current diagnostic methods are used for PROM, then the diagnostic process is simple, but the accuracy is low with high false-negative rates
Solution Approach 1:
The patent combines multiple antibodies (monoclonal and polyclonal) specific to different amniotic fluid proteins on a single lateral flow assay strip. This merging of multiple detection targets into one test device enables simultaneous detection of multiple biomarkers (PP12, alpha-fetoprotein, prolactin), thereby improving diagnostic accuracy and reducing false-negative rates without requiring multiple separate tests
Solution Approach 2:
The lateral flow assay strip utilizes composite material structures including conjugate pads containing antibody-protein complexes, nitrocellulose membranes for antigen capture, and control mechanisms. This composite structure enables sophisticated multi-antibody functionality while maintaining a user-friendly single-strip format, resolving the contradiction between enhanced measurement precision and device complexity
2Reliability
If current diagnostic methods are used for PROM, then the test procedure is simple, but false-positive diagnoses occur leading to unnecessary interventions
Solution Approach 1:
The patent merges multiple specific antibodies against different amniotic fluid proteins (PP12, alpha-fetoprotein, prolactin) onto the same lateral flow assay strip. This combination approach enhances diagnostic reliability by requiring multiple positive detections, thereby reducing false-positive rates and preventing unnecessary obstetric interventions while maintaining a unified test system
Solution Approach 2:
The lateral flow assay strip incorporates control mechanisms that provide immediate visual feedback on test validity. The strip includes control lines that indicate whether the test was performed correctly and whether sufficient sample was applied, enabling real-time quality control and reducing false-positive diagnoses through built-in validation feedback
3Measurement precision
If current diagnostic methods are used for PROM, then the testing process is quick, but the false-negative rate exceeds 10%
Solution Approach 1:
The patent combines multiple antibodies and biomarkers into a single lateral flow assay test, enabling simultaneous detection of multiple amniotic fluid proteins (PP12, alpha-fetoprotein, prolactin) in one quick test. This merging approach maintains the speed advantage of point-of-care testing while dramatically improving detection sensitivity and reducing false-negative rates below 10%
Solution Approach 2:
The lateral flow assay strip is designed as a self-contained, user-friendly device that automatically performs sample processing, antibody binding, and result visualization without requiring complex external equipment or prolonged processing time. The capillary action-based fluid flow and built-in control mechanisms enable the test to complete multiple detection functions quickly and autonomously, maintaining rapid testing while enhancing sensitivity
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 solution significantly reduces false-negative diagnoses, enabling early and accurate detection of PROM, thereby minimizing complications and optimizing perinatal outcomes by providing a more reliable and user-friendly diagnostic tool.
Implementation Method 1
a liquid sample is obtained by placing a long handled swab into the patient's vaginal vault. This sample is then placed into a buffer solution, contained within a vial. After a swab has had enough time to release the markers into the buffer
Implementation Method 2
The fluid sample then migrates by capillary action to the site of the monoclonal and polyclonal antibodies, wherein the antibodies specifically bind to the specific antigen present in the sample
Data Source
AI summary
A method is taught for the accurate determination of the premature rupture of membranes (PROM), defined as spontaneous rupture of membranes before the onset of uterine contractions. More specifically, a lateral flow assay strip tests for at least two antigens to greatly limit or eliminate the possibility of false negatives. A built-in timer in the cassette holding the lateral flow assay further increases the accuracy of the test. A collection buffer vial with self-contained shipping and dropper caps and built-in stand is also taught.