Engineered Skin-Contact Surface for Friction Reduction
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Solution Overview
Problem
Conventional devices that contact skin or external tissue, such as earphones, baby bottles, and breast pumps, often cause skin irritation and discomfort due to high friction, which existing surface structures fail to adequately address.
Innovation Solution
A surface with engineered features, including dome-shaped protrusions with specific geometric parameters such as a pitch of 100 microns or less and a height of 100 microns or less, designed to directly engage external tissue, providing reduced friction and improved comfort by optimizing the material's durometer and shape for low friction and skin compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional smooth surface is used for skin contact, then the device structure is simple and easy to manufacture, but friction is high causing skin irritation and discomfort
Solution Approach 1:
The contacting portion is segmented into multiple discrete dome-shaped surface features arranged in a pattern, rather than a continuous smooth surface. This segmentation reduces the effective contact area with skin, minimizing irritation while maintaining structural manageability through repetitive geometric units
Solution Approach 2:
The surface features are designed with specific local geometric properties (dome shape, 20-50 micron diameter, spaced 40-60 microns apart) that optimize the local interaction with skin. This localized engineering of surface properties reduces friction and irritation at the contact points while the overall structure remains relatively simple
2Object-affected harmful factors
If a structured surface with surface features is used to reduce friction, then user comfort is improved, but manufacturing precision requirements increase
Solution Approach 1:
The surface features are designed with specific parameter ranges (dome diameter 20-50 microns, spacing 40-60 microns, height 10-30 microns) that balance friction reduction effectiveness with manufacturability. These parameter specifications provide clear manufacturing targets while allowing reasonable tolerances for production processes
Solution Approach 2:
The dome-shaped (spheroidal) geometry of surface features is chosen because it is relatively simple to manufacture using standard molding or machining techniques compared to more complex geometries. The curved surface naturally reduces contact pressure points and friction while being compatible with conventional manufacturing methods
3Object-affected harmful factors
If the pitch between surface features is reduced to increase coverage, then friction reduction is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The surface features are spaced at intervals (pitch of 40-60 microns) that provide sufficient friction reduction without requiring complete continuous coverage. This partial action approach achieves the necessary friction reduction while maintaining manufacturability and avoiding the complexity of densely packed or continuous surface structures
Data Source
Figure 1A~1B
Figure 1C
Figure 1D~1F
AI summary
An apparatus structured to contact external tissue, such as skin, of a user includes an elastomeric contacting portion that is structured to directly engage the external tissue. The contacting portion has an engineered surface (64A, 64B) that includes a plurality of non- random, predesigned surface features (70, 74B, 76B, 78B) designed to reduce friction and improve user comfort. In one implementation, the pitch (P) between each immediately adjacent pair of the surface features (70, 76B) is less than or equal to a predetermined maximum pitch value, and the height (H) of each of the surface features (70, 76B) is less than or equal to a predetermined maximum height value.