Orthodontic Expansion Screw Spindle Obstruction
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Solution Overview
Problem
Existing orthodontic expansion screws face challenges in reproducibly preventing spindle twisting without a metal strip and require additional components for assembly, leading to inconsistencies in obstruction levels.
Innovation Solution
The orthodontic expansion screw incorporates a spindle with recesses or flattened regions on its threaded parts, combined with springy extensions on the bodies that resiliently press against the threads, providing a defined and reproducible obstruction without a metal strip, allowing for precise control of spindle position and preventing inadvertent twisting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal strip is used to press on the activating part of the spindle, then the spindle obstruction is well-defined, but additional components and assembly complexity are required
Solution Approach 1:
The invention merges the spindle obstruction function into the threaded part itself by integrating recesses or flattened regions directly into the threaded structure. This eliminates the need for separate metal strip components while maintaining the obstruction function, as the threaded part's modified geometry directly provides the desired spindle positioning and prevention of inadvertent twisting.
Solution Approach 2:
The invention extracts the obstruction function from a separate metal strip component and transfers it directly into the threaded part's geometry. By removing the need for additional metal strip components and their assembly, the design simplifies the overall structure while preserving the essential spindle obstruction and positioning capabilities.
2Device complexity
If the female thread is pinched to create obstruction, then no separate component is needed, but the pinching extent cannot be reproduced consistently
Solution Approach 1:
The invention applies preliminary action by pre-forming recesses or flattened regions into the threaded part during manufacturing. This pre-established geometry ensures consistent spindle obstruction characteristics across all produced units, eliminating the variability inherent in post-manufacturing pinching operations while maintaining structural integrity and functional reliability.
Solution Approach 2:
The invention changes the geometric parameters of the threaded part by introducing recesses or flattened regions with specific dimensions and positions. These controlled parameter modifications provide reproducible spindle obstruction without requiring inconsistent manual pinching, ensuring uniform performance across production batches.
3Reliability
If recesses or flattened regions are formed on the threaded part, then spindle obstruction is reproducible without additional components, but manufacturing complexity increases
Solution Approach 1:
The invention segments the threaded part's geometry by introducing discrete recesses or flattened regions at specific locations along the thread. This segmentation approach allows for standardized manufacturing processes that can be consistently applied across production, making the increased complexity manageable through modular design and repeatable fabrication 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
This solution ensures a well-defined and reproducible obstruction of the spindle, eliminating the need for a metal strip and reducing assembly complexity, while maintaining effective prevention of spindle rotation and twisting, ensuring consistent performance across multiple expansion screws.
Implementation Method 1
The extension resiliently presses against the thread of the at least one threaded part of the spindle in positions of the spindle in which the extension does not face any recess in the threaded part
Implementation Method 2
an springy extension, which is arranged on the first end of the body facing the activating part of the spindle, or on its second end facing the activating part of the spindle
Data Source
AI summary
The orthodontic expansion screw has two bodies, the mutual distance between which can be changed by a spindle means. The spindle has an activating part with a threaded part and is turned into a threaded hole of one of the two bodies. The bodies have a first end, which faces the activating part of the spindle, and a second end, which faces away from the activating part of the spindle. A linear guiding means engage both bodies and guide them while preventing a relative rotation of the bodies and prevent inadvertent twisting of the spindle relative to the bodies. The spindle's threaded part has a recess in which the at least one threaded part is inserted and has an extension externally that contacts the threaded part on a flattened region or in the recess, whereas it elastically presses against the threaded part.