Thoracic Arch Spring Teaching Aid Shear Force Prevention
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Solution Overview
Problem
Conventional thoracic arch spring teaching aids are prone to deformation and breakage due to shear forces when repeatedly pressed, making them unreliable for simulating cardiopulmonary resuscitation training.
Innovation Solution
The thoracic arch spring teaching aid features arch-shaped spring pieces with limit spring plates above and below, having extension portions that curve away from the base, mounted on a spacer and guided by a mechanism to distribute pressure, preventing shear forces and maximizing deformation without breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the thoracic arch spring is pressed from the top down during teaching, then the spring pieces deform to simulate cardiopulmonary resuscitation, but the portion in contact with the limit plates forms a shear zone subjected to large shearing force causing deformation and breakage
Solution Approach 1:
The limit plates are designed with curved ends instead of straight edges. The curved surface distributes the pressing force more evenly across the spring pieces, avoiding concentration of stress at specific contact points. This curvature design eliminates the formation of shear zones that would otherwise occur with flat limit plates, preventing deformation and breakage while maintaining the teaching function.
Solution Approach 2:
The limit plates are pre-installed with curved surfaces that are specifically shaped to match the expected deformation pattern of the spring pieces. This preliminary design ensures that when pressing occurs during teaching, the force is immediately distributed along the curved surface, preventing the formation of harmful shear zones before they can cause damage.
2Adaptability or versatility
If the spring pieces are repeatedly pressed to simulate multiple resuscitation scenarios, then teaching versatility is improved, but the shear zone accumulates stress leading to eventual breakage
Solution Approach 1:
The curved ends of the limit plates create a progressive contact area that increases as spring pieces deform. This design allows repeated pressing cycles without stress concentration, enabling the teaching aid to withstand multiple resuscitation scenario demonstrations while extending the service life of the spring pieces.
Solution Approach 2:
The curved geometry of the limit plates changes the stress distribution parameters during deformation. Instead of creating a concentrated shear zone, the curved surface transforms the stress field to distribute forces more uniformly, allowing the spring pieces to undergo repeated deformation cycles without accumulating damaging stress.
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 enhances the durability and service life of the teaching aid by avoiding shear zones during deformation, ensuring consistent performance and extended usability in training scenarios.
Implementation Method 1
the spring pieces is deformed upon pressed
Data Source
AI summary
A thoracic arch spring teaching aid, comprising a thoracic arch spring (1) having a contour similar to that of the sternum of the human body. The thoracic arch spring (1) has an area enclosed therein as a simulated thoracic cavity (100); the thoracic arch spring (1) comprises a plurality of arch-shaped spring pieces (11); limit spring plates (21, 22) for pressing the spring pieces (11) are provided above and/or below the thoracic arch spring (1); the limit spring plates (21, 22) comprise base portions (210, 220) contacting the spring pieces (11) and extension portions (211, 221, 211′, 221′) located at two sides of the base portions (210, 220); the extension portions (211, 221, 211′, 221′) extend along the projections of the spring pieces (11) on the plane where the base portions (210, 220) are located. The teaching aid can prevent the spring pieces (11) from forming a shearing force region when the spring pieces (11) are pressed; thus, deformation or breakage is avoided, and the service life is prolonged.