Bilayer Tympanic Membrane Graft Insertion Device
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Solution Overview
Problem
Current tympanoplasty procedures face challenges with graft displacement and poor approximation of grafts to the perforation site, leading to inadequate healing and variable outcomes due to the lack of effective devices to hold grafts in place during the healing process.
Innovation Solution
The development of bilayer tympanic membrane graft insertion devices with a 'T' shape design, featuring flexible arms and a post, made from biodegradable materials, which can be used to securely hold both underlay and overlay grafts in place using a constrained configuration, allowing for proper adhesion and healing, and can be removed or dissolved once the membrane has healed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional tympanoplasty procedures are used without specialized holding devices, then the surgical procedure can be performed with simpler equipment, but graft displacement occurs and graft approximation to the perforation site is poor
Solution Approach 1:
A post device serves as an intermediary element inserted through the perforation to provide a stable anchor point. The post mediates between the surgical field and the graft material, enabling reliable positioning without requiring complex suture techniques or multiple support structures
Solution Approach 2:
The underlay graft is positioned on the post, followed by the overlay graft which encapsulates the post and underlay graft. This nested arrangement creates a stable, self-contained structure that maintains graft position while using simple, sequential placement rather than complex simultaneous positioning
2Manufacturing precision
If grafts are placed without a constrained configuration device, then the placement procedure is faster, but graft approximation to the perforation and remnant tympanic membrane is poor
Solution Approach 1:
The underlay and overlay grafts are pre-positioned on the post in a controlled manner before final insertion. This preliminary arrangement ensures proper approximation to the perforation edges and remnant tympanic membrane is achieved before the graft is secured in place, reducing the need for time-consuming adjustments during surgery
Solution Approach 2:
The device allows dynamic adjustment during placement, where the post can be manipulated to optimize graft positioning. The flexible nature of the graft materials on the post enables fine-tuning of approximation before final securing, achieving precision without requiring overly complex fixed-positioning mechanisms
3Reliability
If multiple surgical procedures are performed to ensure proper graft positioning, then graft position stability can be improved, but the surgical time and anesthesia exposure increase
Solution Approach 1:
The post device performs multiple functions simultaneously: it anchors the underlay graft, provides a framework for overlay graft placement, maintains spacing between graft layers, and facilitates approximation to the perforation edges. This multi-functionality achieves reliable healing outcomes in a single procedure rather than requiring multiple sequential surgeries
Solution Approach 2:
The underlay and overlay graft placement procedures are merged into a single integrated operation using the post as a common reference structure. Both grafts are positioned and secured together in one surgical session, reducing total anesthesia exposure while maintaining the reliability that would otherwise require separate procedures
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 devices ensure improved sound transmission and healing by maintaining graft position during the healing process, reducing the need for extensive surgical time and anesthesia, and allowing for complete closure of perforations without the need for removal, enhancing the success rate of tympanoplasty procedures.
Implementation Method 1
The devices can include one or more biodegradable materials... The devices can be removed or dissolved once the membrane has healed
Data Source
AI summary
The devices described herein are used for holding an undelay graft and an overlay graft in place for repair a tympanic membrane. The devices include a post having a proximal end and a distal end; and first and second arms, each having a proximal end and a distal end. The distal end of the post is flexibly joined to the proximal end of the first arm and to the proximal end of the second arm. When the device is in a deployed configuration, the first arm and the second arm extend substantially perpendicularly from the post; and when the first arm and the second arm are clamped into a constrained configuration, the first arm and the second arm extend substantially parallel to a central axis of the post.