Polypeptide Antibiotic-Coated Fluidic Channels for Pathogen Capture
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Solution Overview
Problem
Existing technologies are inadequate in effectively capturing and removing bacterial pathogens and toxins from fluids, particularly in the treatment of sepsis, endotoxemia, and bacteremia, due to limitations in adsorption efficiency and specificity.
Innovation Solution
A multidirectional fluidic channel coated with a polypeptide antibiotic, such as polymyxin or vancomycin, is used to capture and adsorb pathogens and toxins from fluids, utilizing a substance coating the channel walls that is covalently bonded and combined with crosslinking agents to enhance adsorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adsorption materials are used to capture pathogens and toxins from fluids, then the device structure is simple, but the adsorption efficiency and specificity are insufficient
Solution Approach 1:
The patent changes the chemical parameters of the adsorption surface by coating channel walls with polypeptide antibiotics (polymyxin B, vancomycin) at controlled concentrations (0.5-50 mM). This chemical modification dramatically improves adsorption efficiency and specificity for bacterial pathogens and toxins while maintaining a relatively simple microfluidic channel structure
Solution Approach 2:
The patent creates a composite structure by combining conventional microfluidic channel materials with polypeptide antibiotic coatings. This composite approach integrates the mechanical integrity of the channel structure with the high-specificity adsorption properties of polypeptide antibiotics, achieving both structural simplicity and high adsorption efficiency
2Reliability
If non-specific adsorption materials are used, then the manufacturing process is simple, but the specificity for capturing target pathogens and toxins is low
Solution Approach 1:
The patent achieves high specificity by changing the chemical nature of the coating material to polypeptide antibiotics with known specific binding properties. Polymyxin B specifically targets Gram-negative bacteria and endotoxins, while vancomycin targets Gram-positive bacteria. The specificity is controlled by parameters including polypeptide concentration (0.5-50 mM), crosslinking agent concentration (1-20% v/v), and coating time (1-24 hours)
3Productivity
If high concentrations of polypeptide antibiotic are used to enhance adsorption, then the adsorption efficiency improves, but the cost and potential toxicity increase
Solution Approach 1:
The patent extracts the toxic free polypeptide antibiotic from the fluid stream by immobilizing it on the channel walls through covalent bonding. This extraction of the toxic form while retaining the functional form (immobilized coating) allows high adsorption capacity without exposing patients to free toxic polypeptide antibiotics in the treated fluid
Solution Approach 2:
The patent uses crosslinking agents (hexamethylene diamine, polyethylene glycol) as intermediaries to covalently bond polypeptide antibiotics to the channel wall. This intermediary approach creates stable immobilized coatings that maintain high adsorption capacity while preventing leaching of toxic free polypeptide into the treated fluid
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 provides efficient and specific capture and removal of bacterial pathogens and toxins, improving treatment outcomes for conditions like sepsis and bacteremia by enhancing the adsorption process.
Implementation Method 1
a multidirectional fluidic channel coated with a polypeptide antibiotic and/or other materials... capture and adsorb pathogens and toxins from fluids
Implementation Method 2
a substance coating at least a portion of the at least one inner wall... covalently bonded and combined with crosslinking agents to enhance adsorption
Data Source
AI summary
A device for the capture and adsorption of blood-borne materials of interest comprising a fluidic cartridge with at least one inlet and at least one outlet; a multidirectional fluidic channel between the at least one inlet and the at least one outlet; said multidirectional fluidic channel comprising at least one inner wall; and a substance coating at least a portion of the at least one inner wall of the multidirectional fluidic channel.