Factor Xa Reagent Composition for Slower Coagulation Detection
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Solution Overview
Problem
Existing methods for detecting and measuring factor Xa inhibitors in test samples are limited by rapid coagulation rates, which can lead to inaccurate or incomplete detection, particularly when higher sample volumes and concentrations are used.
Innovation Solution
The use of factor Xa reagents containing guanidine derivatives, such as alkylated guanidines, which modulate factor Xa activity to slow down coagulation rates, allowing for greater sample volumes and concentrations, and the inclusion of chromogenic or fluorogenic substrates for accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If factor Xa inhibitors are detected using conventional methods, then detection can be performed, but rapid coagulation rates cause inaccurate or incomplete detection
Solution Approach 1:
The patent introduces guanidine derivatives that chemically modify the reaction environment to slow down the coagulation rate. By changing the chemical parameters of the assay system, the rapid coagulation process is transformed into a slower, more measurable reaction, enabling accurate detection of factor Xa inhibitors even at higher concentrations and with larger sample volumes.
2Measurement precision
If higher sample volumes and concentrations are used, then more accurate detection can be achieved, but rapid coagulation prevents complete reaction
Solution Approach 1:
Guanidine derivatives are added to the assay system to alter the reaction kinetics. This chemical modification extends the effective reaction time by slowing down coagulation, allowing the assay to complete fully even when higher sample volumes and concentrations are used, thereby achieving more accurate detection results.
3Device complexity
If conventional factor Xa reagents are used, then simple composition is maintained, but coagulation rates are too rapid for accurate measurement
Solution Approach 1:
The patent creates a composite reagent system combining factor Xa, substrate, and guanidine derivatives. This composite formulation integrates multiple functional components: factor Xa provides the enzymatic activity, substrate provides the measurable signal, and guanidine derivatives provide reaction rate modulation. The combination achieves accurate detection while maintaining relatively simple reagent composition.
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
This approach enables more accurate and reliable detection of factor Xa inhibitors by slowing down reaction rates, facilitating the use of higher sample volumes and concentrations, and providing clinically relevant results.
Implementation Method 1
Factor Xa (FXa) is the activated form of coagulation factor X, or thrombokinase. Factor X is an enzyme that promotes coagulation of a test sample. An example factor Xa inhibitor is an anticoagulant that functions by selectively blocking activity of factor Xa
Implementation Method 2
The substrate may be or include a chromogenic substrate. The method may include measuring activity of the factor Xa based on a state of the substrate
Data Source
AI summary
An example composition includes factor Xa, a substrate, one or more of guanidine derivatives, and, in some cases, heparin. An example method for detecting an anticoagulant in a sample includes combining or contacting the sample with the composition and measuring activity of the factor Xa based on a state of the substrate. The composition modulates the activity of the factor Xa in the sample, where modulation includes reducing a rate of coagulation of the sample caused by factor Xa. A presence of the anticoagulant is based on the activity of the factor Xa.