Normally-Closed Valve Teat for Infant Feeding
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Solution Overview
Problem
Existing teats often allow liquid to flow whenever there is a pressure difference, leading to discomfort and increased risk of ingesting air during bottle feeding, as they do not mimic the natural breast feeding mechanism effectively, where liquid intake involves a normally closed system.
Innovation Solution
A teat with a normally-closed valve that is openable only under suction forces, integrated within a valve body configured to prevent changes in its closed-opened condition due to deformation during liquid intake, ensuring a direct relation with the sucking mechanism and minimizing disruption from peristaltic tongue movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a teat is designed with always-open liquid outlet holes to allow liquid flow whenever there is a pressure difference, then liquid intake is facilitated, but the infant experiences discomfort and increased risk of ingesting air because this does not mimic natural breast feeding
Solution Approach 1:
The teat employs a dynamic valve mechanism that transitions between closed and open states based on suction pressure. The valve remains closed during normal conditions and only opens when sufficient suction is applied by the infant, mimicking the natural breast feeding mechanism where milk flows only when the infant actively sucks. This dynamic behavior eliminates continuous liquid flow that causes discomfort and air ingestion.
Solution Approach 2:
The teat utilizes parameter changes in suction pressure to control valve state. When suction pressure exceeds a threshold value, the valve opens to allow liquid flow; when suction pressure drops below the threshold, the valve closes to stop flow. This parameter-based control replicates the on-demand flow characteristic of breast feeding, preventing the harmful effects of continuous flow while maintaining ease of liquid intake when needed.
2Device complexity
If a teat uses simple open holes for liquid outlet, then device complexity is reduced, but the feeding process is disrupted by unexpected liquid flow and choking
Solution Approach 1:
The valve mechanism introduces dynamic control to the teat structure, transitioning from a static open-hole design to a dynamically controllable flow system. The valve responds to suction pressure changes by opening or closing, providing reliable control over liquid flow timing and preventing feeding disruptions while maintaining relatively simple overall device complexity.
Solution Approach 2:
The valve system implements feedback control where the suction pressure exerted by the infant is sensed by the valve mechanism, which then adjusts the liquid flow accordingly. This feedback loop ensures that liquid flows only when the infant is actively sucking, preventing choking and feeding disruptions while maintaining a simple and reliable feeding process.
3Speed
If a teat allows continuous liquid flow under pressure difference, then liquid delivery speed is increased, but the stop-go functionality of breast feeding is lost causing confusion to the infant
Solution Approach 1:
The valve mechanism transforms continuous liquid delivery into dynamic stop-go flow patterns. The valve opens rapidly when suction threshold is reached, enabling quick liquid delivery, then closes when suction decreases, creating the natural stop-go rhythm of breast feeding. This dynamic control maintains high liquid delivery speed when needed while adapting to the infant's feeding rhythm.
Solution Approach 2:
The teat implements periodic liquid flow corresponding to the infant's sucking rhythm. Liquid flows in periodic bursts when suction is applied, then stops when suction ceases, replicating the periodic nature of breast feeding. This periodic action maintains efficient liquid delivery while providing the adaptability and rhythm that infants expect from natural feeding, preventing confusion.
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
This design prevents unexpected liquid flow and maintains a stop-go functionality similar to breast feeding, reducing discomfort and air ingestion, while allowing natural peristaltic tongue movements, thus enhancing the feeding experience.
Implementation Method 1
a deformable hollow mouthpiece for a user of the teat to suck on during a liquid intake action for the purpose of displacing liquid in a downstream direction through the teat body
Implementation Method 2
the valve being openable under the influence of suction forces exerted to the mouthpiece by a user of the teat during a liquid intake action
Data Source
AI summary
A teat (1) comprises a hollow teat body (10) including a deformable hollow mouthpiece (11) and a normally-closed valve (30) arranged at a level of the mouthpiece (11) or a level more downstream, the valve (30) being openable under the influence of suction forces exerted to the mouthpiece (11) by a user of the teat (1) during a liquid intake action. The valve (30) is included in a valve area (32) of a valve body (31) that is configured and arranged to prevent a closed-opened condition of the valve (30) from being changed under the influence of deformation of the mouthpiece (11) inflicted by a user of the teat (1) during a liquid intake action, so that the closed-opened condition of the valve (30) is controllable by means of suction forces exerted to the mouthpiece (11) by a user of the teat (1) during a liquid intake action.