Polymer Tissue Sealant with Cross-Linking for Moist Adhesion
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Solution Overview
Problem
Current tissue sealants and adhesives in biomedical applications face issues such as toxicity, allergenicity, infection risk, disease transmission, mechanical weakness, and high costs, with limited mechanical strength and reliability, especially in moist tissues and vascular applications.
Innovation Solution
Development of novel tissue sealant and adhesive compositions comprising polymers, cross-linking agents, and modifiers, including lactoferrin derivatives, which improve mechanical strength, resilience, toxicity, swelling, and infection rates, while being less allergenic and more biodegradable, with convenient delivery systems and indicators for enhanced application control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional biocompatible materials (collagen, gelatin, oxidized cellulose) are used for tissue sealing, then mechanical means and physical barriers are provided, but reliability is poor due to migration and infection propensity
Solution Approach 1:
The patent employs composite material structures combining hydrogel matrices with cross-linked polymer networks. This composite approach creates a stable, non-migrating sealant that resists infection while maintaining biocompatibility, directly resolving the reliability issues of traditional single-material approaches
Solution Approach 2:
The patent modifies key parameters of sealant materials including cross-linking density, molecular weight distribution, and hydrophilicity balance. These parameter changes enhance mechanical stability and reduce migration while maintaining appropriate degradation rates, thereby improving reliability without increasing infection risk
2Reliability
If thrombin and fibrin glue products are used, then greater reliability is achieved, but mechanical strength is lacking and adhesion to moist tissues is limited
Solution Approach 1:
The patent combines fibrin-based components with synthetic polymer cross-linking systems to create a composite sealant that retains the biological compatibility of fibrin while gaining enhanced mechanical strength and improved adhesion to moist tissues through the synthetic polymer network
Solution Approach 2:
The patent creates regions of varying cross-linking density and polymer concentration within the sealant structure. Areas closer to tissue interfaces have higher adhesion-promoting properties, while internal regions provide structural strength, optimizing both adhesion and mechanical properties locally
3Reliability
If cross-linked polymers are used in sealants (DuraSeal, CoSeal, BioGlue), then reliability increases, but toxicity, allergenicity, and infection risk increase
Solution Approach 1:
The patent carefully controls cross-linking parameters including agent concentration, reaction time, and temperature to achieve sufficient structural reliability while minimizing residual toxicities and allergenicities. The cross-linking density is optimized to balance strength with biocompatibility
Solution Approach 2:
The patent employs biodegradable cross-linked polymer structures designed to fulfill their sealing function temporarily and then degrade into non-toxic byproducts. This transient functionality reduces long-term toxicity and allergenicity while maintaining reliability during the critical healing period
4Duration of action of stationary object
If conventional sealants are used, then basic sealing function is provided, but biodegradation time is extensive and costs are high
Solution Approach 1:
The patent incorporates hydrolytically labile bonds and enzyme-cleavable linkages into the polymer structure at controlled frequencies. This allows the sealant to maintain structural integrity for the required duration and then undergo rapid biodegradation, reducing the time loss without compromising initial sealing reliability
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 new compositions provide improved mechanical strength, reduced toxicity and infection rates, faster biodegradation, and lower allergenic potential, making them more reliable and cost-effective for various biomedical applications, including vascular and dural repairs, with enhanced application precision.
Implementation Method 1
compositions comprising polymers, cross-linking agents, and modifiers
Implementation Method 2
including lactoferrin derivatives, which improve mechanical strength, resilience, toxicity, swelling, and infection rates
Data Source
AI summary
Compositions and methods for sealing, coating and adhering tissues are provided that utilize a polymeric system comprising at least a Polymer and a crosslinking agent; and, optionally, (i) a Gelation Disrupting Agent, (ii) an Augmentative Polymer or Monomer, (iii) an Adjunct Compound (iv) an Antimicrobial Agent (v) an Adhesion Enhancer, (vi) a Crosslink Augmentating Agent or any combination thereof. Additionally, a Therapeutic Agent may be incorporated.