Elastomeric Implant Membrane Texturing for Shear Resistance
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Solution Overview
Problem
Current breast implants face challenges in providing a natural feel and appearance while ensuring biocompatibility and ease of manufacturing, particularly in resisting shear forces and capsular contraction, especially in multi-chamber designs with complex membrane junctions.
Innovation Solution
An adjustable implant with an elastomeric membrane featuring a textured exterior surface, formed by casting in a mold with textured inner surfaces, allowing for expansion and contraction to create a cohesive gel-filled chamber, which exerts a contracting force on the gel, providing a stable and natural feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-chamber implant design with complex membrane junctions is used, then size and shape variability is improved, but resistance to shear forces deteriorates
Solution Approach 1:
The implant is divided into multiple chambers (first chamber filled with cohesive gel, second chamber filled with saline or silicone gel) separated by a shared wall membrane. This segmentation allows independent volume control of each chamber, enabling size and shape variability while maintaining structural integrity through the shared wall design that distributes shear forces across multiple load-bearing surfaces.
2Reliability
If shell coatings and texturing are applied, then capsular contraction is reduced, but manufacturing complexity increases
Solution Approach 1:
The outer shell is provided with specific surface texturing (e.g., dimpled or roughened surfaces) only on the external surface that contacts surrounding tissue, while the internal surfaces and membrane junctions maintain smooth finishes. This localized texturing approach reduces capsular contraction at the tissue interface without adding complex manufacturing steps to the entire implant structure.
3Object-affected harmful factors
If saline is used as filling material, then biocompatibility is improved, but fluid motion and deformation increase
Solution Approach 1:
The implant utilizes the dynamic properties of saline filling material in the second chamber, allowing controlled fluid motion that can be adjusted through volume variation. The saline's low viscosity enables natural fluid dynamics that can be modulated by the chamber volume, providing a balance between biocompatibility and controlled stability through adjustable parameters.
4Object-affected harmful factors
If silicone gel is used as filling material, then natural properties are improved, but gel bleed and capsular contraction risks increase
Solution Approach 1:
The implant separates silicone gel into a dedicated first chamber with a cohesive gel formulation that has high viscosity and low mobility, enclosed by a robust membrane. This segmentation isolates the silicone gel from direct contact with surrounding tissues, reducing gel bleed risks while maintaining the natural feel and appearance benefits through the cohesive gel's properties.
5Adaptability or versatility
If access ports and valves are added for volume adjustment, then adaptability is improved, but device complexity and potential failure points increase
Solution Approach 1:
The implant employs a single access port that provides universal access to both the first chamber (cohesive gel) and second chamber (saline/silicone gel) through a shared valve mechanism. This multi-functional access system allows volume adjustment of either or both chambers through one port, reducing the number of separate access points while maintaining full adaptability for size and shape customization.
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 enhances biocompatibility, manufacturing efficiency, and resistance to shear forces, offering a natural feel and appearance while reducing capsular contraction risks, with the elastomeric membrane's textured surface improving tissue adhesion and interaction.
Implementation Method 1
The membrane can be pre-stressed prior to filling. For example, pre-stressing can include expanding the volume of the cavity substantially beyond both the volume of the membrane when cured and the volume of the finished implant.
Implementation Method 2
The outer surface of the membrane can be textured, for example, to improve adhesion and/or interaction with breast tissue. For example, channels, ridges, or other features of a textured surface may be imparted to the outer surface of the implant during formation of the outer layers of the implant, for example, by casting in a mold.
Data Source
AI summary
A method of forming an implant includes providing a preformed shell formed from at least one cured elastomeric layer. The preformed shell includes an outer surface, an inner surface, and an opening for accessing an interior volume of the preformed shell. The method further includes expanding the preformed shell to an expanded state, in which the interior volume is greater than the interior volume of the preformed shell at a time of forming the preformed shell and forming an inner zone having at least one inner elastomeric layer on at least a portion of the inner surface of the preformed shell, while the shell is in the expanded state, thereby forming a multi-zone shell. The method further includes reducing the interior volume of the multi-zone shell, thereby contracting the at least one inner elastomeric layer of the inner zone and causing texturing of the at least one inner elastomeric layer.