Absorbable Composite Yarns for Controlled Tissue Load Transfer
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Solution Overview
Problem
Current medical devices such as sutures and meshes made from non-absorbable materials can cause long-term tissue reactions and infections due to their inability to gradually transfer load to surrounding tissues, leading to uncontrolled acidic by-product production and limited site-specific mechanical support.
Innovation Solution
Development of absorbable/biodegradable composite yarns with distinct physicochemical and biological properties, combining monofilament and multifilament yarns made from specific polyesters like glycolide, l-lactide, and ε-caprolactone, which exhibit modulated absorption and strength retention profiles, allowing for controlled degradation and bioactive agent delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If non-absorbable materials are used for sutures and meshes, then long-term mechanical support is provided, but tissue reactions and infections occur due to inability to transfer load to surrounding tissues
Solution Approach 1:
The patent applies parameter changes by transitioning from non-absorbable materials to absorbable/biodegradable polyesters with controlled degradation rates. The composition parameters (monomer ratios, molecular weight, crystallinity) are adjusted to achieve specific absorption profiles that match tissue healing timelines, allowing gradual load transfer while maintaining initial mechanical support.
Solution Approach 2:
The patent utilizes composite materials by combining different absorbable/biodegradable polyester components with distinct degradation characteristics. This creates a multi-phase absorption profile where faster-degrading components provide initial support and slower-degrading components maintain strength during later healing stages, effectively resolving the contradiction between immediate mechanical support and long-term tissue compatibility.
2Reliability
If absorbable fibers are combined with non-absorbable fibers, then tissue ingrowth is permitted in the non-absorbable component, but the non-absorbable component causes long-term presence and potential complications
Solution Approach 1:
The patent extracts the non-absorbable component from the composite material system entirely, replacing it with fully absorbable/biodegradable polyesters. This eliminates the long-term presence of foreign material while preserving the tissue ingrowth function through appropriately designed porous structures and degradation timelines that allow cellular infiltration and matrix deposition.
Solution Approach 2:
The patent changes the fundamental parameter of material absorbability from partial (non-absorbable component) to complete (fully absorbable/biodegradable). By adjusting degradation rate parameters to match tissue regeneration timelines, the material provides temporary structural support for tissue ingrowth then fully integrates into the regenerated tissue without permanent foreign body presence.
3Loss of substance
If rapid degradation occurs in absorbable materials, then quick absorption is achieved, but insufficient mechanical support is provided during healing period
Solution Approach 1:
The patent segments the degradation process into distinct phases by incorporating multiple polyester components with different degradation rates. Fast-degrading components (e.g., polyglycolide) provide initial structural framework and rapid absorption, while slow-degrading components (e.g., polycaprolactone) maintain mechanical strength during the critical healing period, creating a temporally segmented support system.
Solution Approach 2:
The patent employs composite materials with complementary degradation profiles. The synergistic combination of polyesters with different hydrolysis rates creates a multi-phase absorption pattern where faster-degrading components clear early to reduce foreign body response, while slower-degrading components persist to provide mechanical reinforcement throughout the healing timeline.
4Strength
If slow degradation occurs in absorbable materials, then prolonged mechanical support is provided, but extended tissue reaction and delayed absorption occur
Solution Approach 1:
The patent segments the material composition into phases with staggered degradation kinetics. The slow-degrading component provides extended mechanical support as intended, while the fast-degrading component accelerates initial absorption to reduce prolonged foreign body presence. This temporal segmentation resolves the contradiction by distributing absorption events across different time scales.
Solution Approach 2:
The patent uses composite materials where the fast-degrading component accelerates early absorption to minimize prolonged foreign body reaction, while the slow-degrading component maintains mechanical support. The composite structure creates a biphasic absorption profile that simultaneously achieves rapid initial clearance and prolonged structural reinforcement.
5Ease of manufacture
If single-component yarns are used, then manufacturing is simplified, but modulated absorption profiles and site-specific mechanical support cannot be achieved
Solution Approach 1:
The patent merges multiple polyester components with distinct degradation and mechanical properties into a single composite yarn structure. This integration allows the yarn to exhibit modulated absorption profiles and site-specific mechanical support characteristics while maintaining manufacturing efficiency through established fiber blending and yarn spinning technologies.
Solution Approach 2:
The patent applies composite materials by combining different absorbable/biodegradable polyesters within a single yarn construction. The composite nature enables tailored absorption kinetics and spatially varying mechanical properties along the yarn length or across different yarn zones, achieving versatility without sacrificing manufacturability through conventional textile processing.
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
These composite yarns provide prolonged healing periods, minimize tissue reactions, and facilitate tissue regeneration by gradually transferring mechanical load, reducing the risk of infection and allowing natural tissue shape retention, while also enabling controlled release of bioactive agents.
Implementation Method 1
absorbable/biodegradable composite yarns having at least two fibrous components with distinctly different individual physicochemical and biological properties
Implementation Method 2
This arrangement benefits from a coating of an absorbable polyester having a melting temperature of less than 100°C, which preferably contains at least one bioactive agent
Data Source
AI summary
The present invention is directed to absorbable/biodegradable composite yarns, each comprising at least two types of fibrous components having distinctly different absorption and strength retention profiles and the use of these composite yarns to construct surgical implants, such as sutures and meshes with integrated physicochemical and biological properties, modulated through varying the individual yarn content and controlling the geometry of these constructs.