Threaded Jaw Opener for Reproducible MRI Positioning
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Solution Overview
Problem
Existing jaw opening devices are uncomfortable and non-reproducible for magnetic resonance imaging (MRI) tests, failing to maintain precise jaw positions for diagnostic purposes.
Innovation Solution
A biocompatible device with tilting mouthpieces and a threaded mechanism to maintain calibrated jaw openings from closed to maximum, using a wheel to measure and adjust jaw separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a scissor-type device with pivot arms is used to exert pressure on the jaw, then jaw opening force is provided, but the device cannot maintain jaw opening positions for MRI measurement
Solution Approach 1:
The patent replaces the scissor-type mechanical linkage system with a threaded rod and nut mechanism. The threaded connection converts rotational motion of the adjustment handle into precise linear displacement, allowing the movable arm to be positioned and locked at specific angles. This substitution enables both force application and position maintenance, resolving the contradiction between providing jaw opening force and maintaining the opening duration for MRI scans.
2Measurement precision
If a jaw stretching device with piston arm is used, then jaw opening measurement is enabled, but the device is not comfortable and not reproducible for MRI tests
Solution Approach 1:
The patent incorporates a dynamic adjustment mechanism where the movable arm can be positioned at any angle within the measurement range through threaded rod rotation. This continuous adjustability allows customization to individual patient anatomy and comfort requirements, while the threaded locking mechanism ensures reproducible positioning. The design eliminates the fixed-position limitations of piston-based devices, improving both comfort and reproducibility for MRI testing.
3Device complexity
If a device with fixed arm positions is used, then simple structure is achieved, but calibrated jaw opening maintenance across continuous range is not possible
Solution Approach 1:
The patent incorporates a calibrated ruler with degree markings that allows preliminary setting and verification of arm positions before MRI scanning. The threaded adjustment mechanism enables precise positioning at predetermined angles, and the position can be locked and reproduced. This preliminary calibration capability maintains manufacturing precision requirements while keeping the device structure relatively simple through the use of basic mechanical components with accurate scaling.
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
Enables precise and reproducible jaw positioning for MRI tests, providing comfort and accuracy in measuring and maintaining jaw openings.
Implementation Method 1
a threaded link (7) on which the threaded rings (4, 5) can move, with a wheel (8) housed between the two rings (4, 5) and solidly fixed
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a device for maintaining the jaw opening, comprising a first arm (1) attached at one end to a first threaded ring (4) with a first projection (11), a second arm (2) attached at one end to a second threaded ring (5) with a second projection (12), a tilting mouthpiece (6) attached to each arm (1, 2) at the other end, a threaded link (7) where the threaded rings (4, 5) are located, a pin (3) that attaches the arms (1, 2) together in a central area, a wheel (8), solidly attached to the threaded link (7), located between the two threaded rings (4, 5), a ruler (9) with a calibrated slot (10), wherein the first projection (11) is solidly attached to the ruler (9) and the second projection (12) is fixed to the ruler (9) with the ability to slide along the calibrated slot (10).