Friction Control Device with Segmented Contact Surface
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Solution Overview
Problem
Existing methods for reducing static friction between medical devices and human tissue are inefficient, often requiring high power consumption, causing discomfort, and lacking flexibility in controlling friction levels or adjusting for different surface materials, with limited ability to achieve localized control.
Innovation Solution
A friction control device with a contact surface arrangement and an actuator assembly that induces a relative separation of contact surface regions based on the elasticity and properties of the human tissue, breaking local surface pinnings to reduce static friction, allowing for controlled sliding without overcoming static frictional forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If vibrations are induced within the body of the entire device to reduce friction, then dynamic friction is reduced, but power consumption increases and device weight increases
Solution Approach 1:
The patent extracts the vibration generation function from the entire device body and concentrates it only at the contacting surface. This is achieved by incorporating vibrations directly into the contact surface arrangement or by using a separate vibration mechanism that operates only at the interface, thereby reducing overall power consumption and device weight while maintaining friction reduction benefits.
Solution Approach 2:
The patent applies vibrations locally only at the contacting surface rather than throughout the entire device body. This localized approach reduces the energy required to generate vibrations and minimizes the weight increase, while still achieving effective friction reduction at the critical interface with human tissue.
2Object-affected harmful factors
If vibrations are propagated across the entire device surface, then friction reduction is achieved, but localized control is not possible
Solution Approach 1:
The patent segments the contacting surface into multiple independent regions, each capable of being vibrated or deformed separately. This segmentation enables localized control of friction reduction at different areas of the device-tissue interface, allowing adaptation to varying tissue properties and application requirements across different surface regions.
Solution Approach 2:
The patent implements local quality by enabling different regions of the contacting surface to have independent vibration or deformation characteristics. This allows each local area to be optimized for its specific function or tissue type, providing adaptability and localized control while maintaining overall friction reduction across the entire interface.
3Speed
If large lateral forces are applied to overcome static friction, then device movement is achieved, but tissue damage or irritation occurs
Solution Approach 1:
The patent uses mechanical vibrations at the contacting surface to reduce static friction, enabling device movement with minimal lateral forces. The vibrations prevent strong adhesive bonds from forming between surface asperities, allowing smooth gliding that avoids tissue damage and irritation while maintaining effective device mobility.
Solution Approach 2:
The patent introduces vibrations or surface deformations as an intermediary mechanism that facilitates device movement without requiring direct application of large lateral forces to the tissue. This intermediary action reduces the mechanical stress on tissue while enabling effective device gliding.
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 device achieves reduced static friction, enabling smooth gliding with minimal resistance, reducing tissue damage and irritation, and allowing for adjustable friction levels and localized control across different skin types.
Implementation Method 1
a flexible unitary layer adapted to accommodate lateral stretching outwards from the layer along directions parallel with a plane defined by a lower major surface of the layer
Data Source
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AI summary
A friction control device (44) is adapted to induce a lateral strain (or stretching) within a human tissue surface to which the device is applied, in order thereby to reduce the static friction between the device and the human tissue surface. The strain is induced by means of an actuator arrangement adapted to effect a relative separation of a plurality of contact surface regions (40) of the device, such that when said regions are pressed onto the receiving surface, the relative separation induces a strain in at least the region of the receiving surface falling between the locations of the applied regions. The extent of separation matches or exceeds the minimum extent necessary to overcome static friction.