Mandible Bone Fragment Fixing Device with Two-Stage Drill
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Solution Overview
Problem
Current bone fragment-fixing methods using external fixation techniques are unstable, lead to increased surgical time and patient burden, and result in aesthetic and functional inconveniences due to protruding bone fragments and frictional heat during cutting.
Innovation Solution
A bone fragment-fixing device with a supporting portion on the inner mandible surface, a connecting portion that protrudes externally, and a drill assembly featuring a two-stage blade to reduce frictional heat and stabilize bone fragments, allowing for reduced surgical steps and improved aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If external fixation methods are used to fix bone fragments, then the fixation can be applied from the outer surface, but the support is not stable and the bone fragments are strained
Solution Approach 1:
The patent inverts the conventional external fixation approach by placing the supporting portion on the inner surface of the mandible instead of the outer surface. The supporting portion contacts the inner surface of the bone fragment, while the fixing portion extends outward to be fixed to the outer surface of the mandible. This inversion allows stable support from within while maintaining ease of external application and avoidance of muscle interference.
2Reliability
If fixation is performed on all of the original bone and bone fragments, then complete fixation is achieved, but treatment steps increase and surgical time becomes longer
Solution Approach 1:
The fixing device is segmented into three functional portions: a supporting portion for contacting and stabilizing the bone fragment, a connecting portion for bridging the inner and outer surfaces, and a fixing portion for external fixation to the mandible. This segmentation allows the device to achieve complete fixation functionality while simplifying the surgical procedure to a single device application rather than multiple separate fixation steps.
3Reliability
If bone fragments are fixed by advancing outward, then the bone fragments are secured, but they protrude outward causing inconveniences in beauty and daily life
Solution Approach 1:
The device inverts the fixation approach by supporting the bone fragment from the inner surface rather than pushing it outward from the external surface. The supporting portion is positioned on the inner surface of the mandible, contacting the inner surface of the bone fragment, which prevents protrusion and maintains aesthetic appearance while still achieving secure fixation through the external fixing portion.
4Productivity
If a single thick blade is used to cut the mandible, then the cutting is efficient, but a lot of frictional heat occurs between the blade and the mandible
Solution Approach 1:
The cutting operation is segmented into two stages using two different blades: a first blade with larger thickness for initial cutting that removes material efficiently, and a second blade with smaller thickness for final cutting that generates less frictional heat. This segmentation allows the surgical procedure to achieve both high cutting efficiency and reduced thermal damage to surrounding tissues.
Data Source
AI summary
A bone fragment-fixing device of the present invention including: a supporting portion for supporting, on an inner side of a mandible, a bone fragment generated by cutting the mandible; a connecting portion which is connected to one side of the supporting portion and protrudes to a height corresponding to the outer side of the mandible along the cut surface of the bone fragment; and a fixing portion connected to the connecting portion and formed in a shape corresponding to the mandible around the bone fragment.