Spherical Roller Itch Relief Without Skin-Damaging Scratching
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Solution Overview
Problem
Existing itch relief methods, such as scratching with fingernails or scratcher tools, cause damage to the delicate skin barrier, leading to open sores, increased infection risk, and psychological impact due to constant itching and marred appearance.
Innovation Solution
A spherical roller device with a heavier insert and lighter external layer, featuring regularly spaced protrusions, is designed to roll over the skin, interrupting itch pathways without physical rubbing or scraping, using a housing that prevents displacement and allows free rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scratching is performed using fingernails or typical scratcher tools, then itch relief is achieved, but skin damage occurs leading to open sores, increased infection risk, and inflammation
Solution Approach 1:
The patent changes the fundamental parameter of contact mechanism from scratching (friction-based) to rolling (pressure-based). The spherical roller applies controlled pressure through its weight and rolling motion, eliminating the shear forces that cause skin damage while maintaining itch relief through pressure stimulation of nerve endings
Solution Approach 2:
The spherical roller acts as an intermediary tool between the user's hand and the skin. It mediates the itch relief process by distributing pressure through its curved surface and rolling motion, preventing direct nail contact that causes damage while still providing effective pressure stimulation for itch relief
2Ease of operation
If repeated scratching is performed to relieve itch, then sensation relief is achieved, but the skin barrier is damaged leading to raised thick areas, bleeding, and infection
Solution Approach 1:
The device changes the operational parameter from repeated scratching motions to a single rolling motion. The spherical roller's weight and rolling action concentrate pressure on a small area, achieving itch relief in fewer strokes without the cumulative damage caused by repeated scratching
Solution Approach 2:
The spherical shape of the roller concentrates force through its curved surface during rolling contact. This curvature allows the device to apply focused pressure to stimulate nerve endings for itch relief while the rolling motion prevents prolonged pressure on any single point, protecting skin barrier integrity
3Force
If scratching is performed with force to relieve severe itch, then itch sensation is reduced, but inflammation and infection risk increase
Solution Approach 1:
The patent changes the force application parameter from shear force (scratching) to compressive force (rolling). The spherical roller's weight provides consistent downward pressure, and the rolling motion delivers this force in a controlled manner that stimulates nerve endings without causing the tissue damage and subsequent inflammation associated with forceful scratching
Data Source
AI summary
The present invention relates to an itch relief device which comprises a spherical roller having an insert and an external layer overmoulded over the insert, the insert being heavier than the external layer, and a housing. The housing further comprises a cavity for retaining the spherical roller and shaped to prevent displacement of the spherical roller within the housing, and an aperture having a maximum dimension smaller than an outer diameter of the spherical roller, a portion of the spherical roller protruding through the aperture to contact skin of a user, wherein the external layer comprises a plurality of regularly spaced protrusions extending outwardly, away from the insert, and wherein, as the housing is moved over the skin, contact with the skin induces the spherical roller to roll, thereby bringing successive ones of the protrusions against the skin.