Absorbent Article Conductive Indicators for Removable Wetness Detection
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Solution Overview
Problem
Existing absorbent articles for personal hygiene lack effective and cost-efficient monitoring systems for detecting fluid distribution and voiding patterns, particularly those that can be used without exposing reusable sensors to moisture and are environmentally friendly.
Innovation Solution
An absorbent article with a conductive indicator on the backsheet and a removable detection device that measures resistance or capacitance changes in response to voiding events, featuring channels in the absorbent core to avoid overlap with exudates and using color-changing indicators for accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reusable sensor is used to monitor exudate conditions, then monitoring capability is improved, but the sensor is exposed to moisture which compromises reliability and requires complex signal processing
Solution Approach 1:
The system is divided into two separate parts: a disposable absorbent article containing the indicator that contacts exudates, and a reusable detection device that remains dry. This segmentation allows the sensor to monitor conditions without direct exposure to moisture, maintaining reliability while preserving monitoring capability.
Solution Approach 2:
An electrical indicator layer is introduced as an intermediary between the exudate and the detection device. The indicator changes electrical properties when exposed to exudate, allowing the detection device to measure conditions indirectly without the sensor itself contacting moisture.
2Measurement precision
If complex signal processing is implemented to determine wetness events, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The system uses electrical property changes in the indicator layer (analogous to color changes in optical indicators) that provide direct, intuitive signals for wetness detection. The indicator's electrical conductivity or capacitance changes clearly indicate exudate presence, eliminating the need for complex mathematical and statistical manipulations.
3Area of stationary object
If the indicator pattern overlaps with channels in the absorbent core, then detection coverage is improved, but measurement precision decreases due to false readings from channel areas
Solution Approach 1:
The indicator pattern is designed with spatially varying properties: it extends beyond the channel areas to provide comprehensive coverage, but specifically avoids overlapping with channels where exudate accumulation would cause false readings. This local quality differentiation ensures accurate measurement while maintaining adequate detection coverage.
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
Provides accurate and cost-effective monitoring of exudate presence and distribution, allowing for timely replacement of absorbent articles while minimizing material waste and sensor exposure to moisture.
Implementation Method 1
a detection device that can be removably attached to the absorbent article such to become in electrical communication with said indicator when attached to said article to measure a change in resistance or capacitance in response to a voiding event
Implementation Method 2
a detection device that can be removably attached to the absorbent article such to become in electrical communication with said indicator when attached to said article to measure a change in resistance or capacitance in response to a voiding event
Implementation Method 3
The function of the absorbent core is to absorb and retain the exudates for a prolonged amount of time
Implementation Method 4
The majority of currently marketed absorbent articles comprise as absorbent material a blend of comminuted wood pulp with superabsorbent polymers (SAP) in particulate form
Data Source
AI summary
An absorbent article for personal hygiene such as a diaper, or training pant, or incontinence insert, the absorbent article comprising: a liquid permeable topsheet; a liquid impermeable backsheet; an absorbent core positioned between said topsheet and backsheet, an indicator for indicating the presence of exudates and being positioned on a body-facing side of said backsheet, the indicator comprising an electrically conductive material, the article further comprising a detection device that can be removably attached to the absorbent article such to become in electrical communication with said indicator when attached to said article to measure a change in resistance or capacitance in response to a voiding event, wherein the absorbent core comprises a core wrap enclosing absorbent material therein and wherein a top layer of the core wrap is joined to a bottom layer of the core wrap to form one or more channels substantially free of absorbent material, and wherein the indicator comprises a pattern that extends inboard and/or outboard of said channel(s) such that it does not substantially overlap with said channel(s).