Bone Fixation Device with Covering Part for Expansion
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Solution Overview
Problem
Current bone fixation techniques face issues such as cancellous bone fragments jamming expansion devices, inadequate control over medical filler distribution, and incomplete bone coverage, leading to ineffective bone fixation and potential filler leakage or spreading.
Innovation Solution
A bone fixation device comprising an expansion part and a covering part, where the covering part prevents bone fragments from entering the expansion part, allowing smooth expansion and contraction, and controls medical filler distribution to ensure complete coverage and effective bone propping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical-type hole expansion device is used to expand the bone hole, then the hole expansion effect is achieved, but cancellous bone fragments fall into the device causing it to jam and become unable to be removed
Solution Approach 1:
The patent introduces a covering device as an intermediary component between the expansion device and the bone fragments. This covering device prevents bone fragments from directly contacting and jamming the expansion device, allowing the expansion function to be performed reliably while enabling easy removal of the expansion device after use.
Solution Approach 2:
The patent divides the bone fixation system into separate functional components: a covering device that prevents fragmentation, an expansion device that creates the hole, and a fixation device that provides final stabilization. This segmentation allows each component to perform its specific function without interfering with others, particularly preventing the expansion device from being jammed by bone fragments.
2Reliability
If a filling-type hole expansion device with balloon is used, then the hole expansion effect is achieved, but the balloon may detach from the nozzle or rupture during high-pressure liquid insertion
Solution Approach 1:
The patent extracts the balloon expansion function from a complex balloon-nozzle assembly and integrates it directly into the expansion device structure. This eliminates the separate balloon component that could detach or rupture, while maintaining the effective hole expansion capability through a more reliable integrated design.
3Device complexity
If no hole expansion is performed and a covering device is placed directly into the bone, then the covering device acts as both expansion and fixation device, but the medical filler cannot be poured accurately and may spread out or leak
Solution Approach 1:
The patent performs hole expansion as a preliminary action before placing the covering device and injecting medical filler. This pre-expansion creates a properly sized and shaped cavity that enables accurate filler placement, preventing spreading and leakage, while the covering device then provides the necessary containment during the filling process.
4Reliability
If a mechanical-type hole expansion device is left inside the body without a covering device, then the expansion structure is maintained, but the medical filler cannot fully cover the expansion device and the bone cannot be fully propped up
Solution Approach 1:
The covering device serves as an intermediary that enables complete medical filler coverage of the expansion device. It provides a containment structure that allows the medical filler to be injected and distributed fully around the expansion device, ensuring complete bone support while maintaining the expansion structure's stability.
Data Source
AI summary
A device for bone fixation comprises an expansion part and a covering part. The expansion part has a fixing end and a top end and provides an expansion structure for being adjustable between a state of expansion and contraction. The covering part has a front end and a joining end, wherein the front end thereof is joined to the top end of the expansion part, and the joining end thereof is attached to the fixing end of the expansion part. The covering part is employed to cover the expansion structure. After the expansion part and the covering part are added to the bone, the covering part is unfurled to spread to the expansion state, and the medical filler is injected or pushed into the covering part.