Silk-Polyurethane Tympanic Membranes for Sound Transmission
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Solution Overview
Problem
Existing materials for repairing tympanic membrane perforations, such as autografts and synthetic scaffolds, face challenges in mechanical property mismatch, transparency, donor site morbidity, and the need for improved mechanical and vibroacoustic properties.
Innovation Solution
A silk fibroin biocompatible polyurethane membrane matrix is developed, combining silk fibroin with biocompatible polyurethane, which alters mechanical and vibroacoustic characteristics, enhances strength and flexibility, and is fabricated to transmit sound waves between 20 Hz and 20 KHz, with tensile strength between 5 MPa to 100 MPa.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If autografts such as muscle fascia, fat, perichondrium and cartilage are used for tympanic membrane repair, then the graft material is biocompatible and available, but there is mismatch of graft mechanical properties with the tympanic membrane, non-transparency of grafts, and donor site morbidity
Solution Approach 1:
The patent combines silk fibroin with biocompatible polyurethane to create a composite membrane that integrates the biocompatibility of natural silk with the mechanical strength and flexibility of synthetic polyurethane, resolving the mechanical property mismatch while maintaining biocompatibility
Solution Approach 2:
The patent modifies the mechanical properties of the graft material by adjusting the polyurethane content and molecular weight, enabling tuning of tensile strength and elasticity to match tympanic membrane properties while maintaining transparency through controlled material composition
2Strength
If silk fibroin is used as a bioscaffold, then it has superior mechanical strength and toughness and is biodegradable, but adding blending components to affect mechanical properties remains a challenge and may compromise stability
Solution Approach 1:
The patent creates a stable composite by combining silk fibroin with biocompatible polyurethane, where the polyurethane provides mechanical enhancement without compromising the biodegradability or biocompatibility of the silk fibroin base material
Solution Approach 2:
The patent selectively incorporates polyurethane at specific concentrations (at least 1% w/w) to locally enhance mechanical properties where needed, while maintaining the overall stability and biodegradability of the silk fibroin matrix
3Reliability
If the membrane is made to transmit sound waves between 20 Hz and 20 KHz, then the vibroacoustic properties are improved for ear repair, but the mechanical properties must be precisely controlled with tensile strength between 5 MPa to 100 MPa
Solution Approach 1:
The patent controls tensile strength within the 5-100 MPa range by adjusting polyurethane content and molecular weight, which simultaneously optimizes vibroacoustic properties for sound transmission in the 20 Hz to 20 KHz frequency range
Solution Approach 2:
The silk polyurethane composite enables independent optimization of mechanical and acoustic properties, where polyurethane provides mechanical strength control while silk fibroin maintains vibroacoustic transparency and sound transmission capabilities
Data Source
AI summary
The present invention relates to the preparation of a membrane for use in the repair of the middle ear including perforations and damage to the tympanic membrane. More particularly, the invention provides for compositions and methods for preparing silk fibroin biocompatible polyurethane membranes using a solvent, which have improved biodegradation, mechanical and vibroacoustic properties.