Silicone Gel Skin Adhesion Shear Strength Residue
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Solution Overview
Problem
Silicone gels used in medical devices are fragile under shear stresses, leading to gel residue issues, particularly when subjected to repeated rubbing or high tensions, such as with ostomy bags, without compromising their adhesion to the skin.
Innovation Solution
A silicone gel composition with enhanced static shear strength and adhesion properties is achieved by incorporating a specific range of silicone resin with siloxy units and alkenyl groups, improving penetrability, tack, and adhesive power, while maintaining effective skin adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If silicone gel is used for skin adhesion in medical devices, then adhesion to skin is achieved, but static shear strength is insufficient leading to gel residue under stress
Solution Approach 1:
The patent modifies the chemical composition parameters of the silicone gel by incorporating specific ratios of crosslinking agents and reinforcing fillers. This changes the molecular structure and physical properties of the gel, increasing its static shear strength while maintaining adhesion. The gel transitions from a fragile state to a more robust state that resists shear forces without leaving residue.
Solution Approach 2:
The patent creates a composite silicone gel material by combining base silicone polymer with crosslinking agents (such as silane crosslinkers) and reinforcing fillers (such as colloidal silica or fumed silica). This composite structure provides both the adhesion properties of silicone gel and the mechanical strength needed to prevent residue formation under shear stress.
2Strength
If silicone gel is made more resistant to shear stress, then gel residue is prevented, but adhesion to skin may be compromised
Solution Approach 1:
The patent creates different zones within the silicone gel with varying properties. The outer layer or surface portion maintains softer, more adhesive characteristics for skin contact, while the inner bulk or crosslinked network provides enhanced shear strength. This local differentiation allows the gel to adhere reliably to skin while resisting shear forces that would cause residue.
Solution Approach 2:
The composite structure allows separation of functions: the base silicone polymer provides adhesion to skin, while the crosslinking agents and reinforcing fillers provide shear strength. This multi-component system ensures that improving one property (shear strength) does not necessarily compromise the other (adhesion), as each component contributes differently to these properties.
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 improved silicone gel composition exhibits significantly increased static shear strength, preventing residue formation even under prolonged stress, and maintains strong adhesion to the skin, suitable for medical devices like dressings and ostomy bags.
Implementation Method 1
adhere rapidly to dry skin
Implementation Method 2
maintain a moist environment around the wound and thus make it possible to maintain the hydration of the damaged tissues
Data Source
AI summary
Items that adhere to the skin for medical or paramedical use and methods of making and using the same are described.