Root Canal Tweezers With Offset Grip for Jam-Free File Handling
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Solution Overview
Problem
Existing root canal therapy tools, such as lockable forceps, suffer from issues like loosening and jamming of locking clasps, which hinder secure grasping and handling of endodontic files.
Innovation Solution
Tweezers with offset cylindrical faces and a reverse action mechanism that securely grasp endodontic files without a locking clasp, allowing for stable handling and improved visibility during procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lockable forceps with locking clasp are used to hold endodontic files, then the files can be secured during root canal therapy, but the locking clasp may loosen or jam, causing unintentional release or prevention of engagement
Solution Approach 1:
The patent removes the locking clasp mechanism entirely from the forceps design. Instead of using a locking mechanism that can loosen or jam, the invention uses a simple friction-based grip where the forceps arms are positioned to naturally hold the endodontic file through contact friction alone, eliminating the problematic locking component.
Solution Approach 2:
Rather than using a mechanism that locks and secures the file through active engagement, the inverted approach uses passive friction holding. The forceps are designed with an offset axis that creates a natural gripping position, where the file is held by friction between the forceps arms and the file surface, reversing the traditional locking approach.
2Reliability
If traditional forceps with locking mechanism are used, then files can be held securely, but the complexity of the locking mechanism increases the risk of jamming and loosening
Solution Approach 1:
The invention extracts and removes the entire locking clasp mechanism from the forceps design, retaining only the essential gripping function through simplified friction-based contact between the forceps arms and the endodontic file, thereby reducing device complexity while maintaining reliability.
Solution Approach 2:
The forceps are designed with segmented arms that can independently contact the file at optimal points. The offset axis creates distinct contact zones on opposite sides of the file, allowing each arm to contribute to the gripping force separately, simplifying the overall mechanism while maintaining secure holding.
3Ease of operation
If offset cylindrical faces are used on the tweezers, then the grasping of endodontic files is improved with better contact and control, but the manufacturing precision requirements increase
Solution Approach 1:
The invention specifies an offset angle parameter (between 10-30 degrees) for the cylindrical faces rather than requiring precise perpendicular alignment. This parameter change allows for easier manufacturing while achieving the desired gripping effect, where the offset creates optimal contact points on the file without demanding extreme manufacturing precision.
Solution Approach 2:
The use of cylindrical (curved) surfaces instead of flat faces allows for more flexible contact with the endodontic file. The curved surfaces can accommodate slight variations in file geometry and positioning, reducing the impact of manufacturing tolerances while maintaining good grasping contact and control.
Data Source
AI summary
Tweezers for use in conducting root canal therapy and methods of conducting root canal therapy using the tweezers are described, the tweezers including: a pair of elongate arms; the arms are moveable between a closed condition and an open condition and are biased towards the closed condition; a grasping formation is provided at the end of each of the arms; the grasping formations have substantially part cylindrical faces to grasp opposite sides of a substantially cylindrical item; and wherein the axes of the cylindrical faces are offset from a direction perpendicular to the length of the arms.