Deformable Ear Tip for Acoustic Seal and Comfort
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Solution Overview
Problem
Conventional stethoscope ear tips cause discomfort due to high pressure on irregular ear canals and fail to provide an effective acoustic seal, allowing ambient noise to interfere with sound delivery.
Innovation Solution
The ear tip design consists of three sections: a first section connected to the sound-transmitting device, a deformable second section with a bulbous shape that compresses to increase in diameter, and a third section forming a flume that enters the ear canal, providing a comfortable fit and acoustic seal without penetrating the ear canal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hard conventional ear tips are used to create a sound-proof seal, then acoustic seal is improved, but user comfort deteriorates due to high pressure on the sensitive exterior ear canal
Solution Approach 1:
The ear tip employs a flexible, compliant material that can deform and conform to the irregular surface of the user's ear canal. This flexibility allows the ear tip to create an effective acoustic seal without applying excessive pressure, thereby maintaining both seal quality and user comfort.
Solution Approach 2:
The invention changes the physical parameters of the ear tip material from hard and rigid to soft and compliant. This parameter change enables the material to adapt to varying ear canal shapes and sizes while distributing pressure evenly, resolving the contradiction between achieving a tight seal and avoiding discomfort.
2Object-generated harmful factors
If hard conventional ear tips are used to maximize sound isolation, then sound exclusion is improved, but the ear tip forms a poor acoustic seal allowing ambient sound to infiltrate
Solution Approach 1:
The compliant material allows the ear tip to mold itself to the unique contours of each user's ear canal, creating a custom-fit acoustic seal that effectively blocks ambient sound infiltration while maintaining comfort.
Solution Approach 2:
The ear tip design accommodates the asymmetric and irregular nature of human ear canals by using a material that can deform to match these unique geometries, rather than forcing a symmetric rigid shape that fails to seal properly.
3Reliability
If spring-loaded means are used to force ear tips into the ear, then acoustic seal is improved, but pressure-related discomfort and potential injury worsens
Solution Approach 1:
The flexible ear tip material naturally conforms to the ear canal without requiring spring-loaded forcing mechanisms. The material's compliance allows it to create an effective seal through gentle adaptation rather than aggressive insertion, eliminating the need for spring-loaded components that cause pressure injury.
Solution Approach 2:
The invention replaces the mechanical spring-loaded forcing system with a passive compliant material system. Instead of using mechanical force to achieve the seal, the ear tip relies on its material properties to naturally conform and seal, substituting active mechanical action with passive material adaptation.
4Reliability
If adhesive layers are used to achieve a tight fit, then acoustic seal is improved, but device complexity and manufacturing difficulty worsen
Solution Approach 1:
The ear tip achieves its acoustic seal through the inherent properties of the flexible material itself, eliminating the need for additional adhesive layers. This single-material solution simplifies both the device structure and the manufacturing process compared to composite designs requiring multiple materials and bonding steps.
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 design enhances comfort by distributing pressure over a larger area and effectively seals the ear canal, significantly reducing ambient noise while maintaining clear sound transmission.
Implementation Method 1
The second and third sections are deformable under an axial force in a range of between about 2.22 to about 5.56 Newtons from a relaxed state to a compressed state. The flume tip exhibits a compression diameter increase of up to 50%.
Data Source
AI summary
An ear tip is adapted to deliver sound to an ear canal. The ear tip includes a first section, a second section and a third section. The first section is connectable to a sound-transmitting device. The second section has a first end, a second end and walls defining a bulbous section. The first end is connected to and in open communication with the first section. The second end is connected to and in open communication with the third section. The third section includes walls defining a flume and an outlet port adapted for open communication with the ear canal. The outlet port has a maximum outer diameter of about 11 millimeters. In a relaxed state, a ratio of a maximum outer diameter of the second section to a maximum diameter of the third section is between about 1.25 and about 2.5.