Tapered Implant Thread Forming Tool Trajectory Control
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Solution Overview
Problem
Implants often deviate from their intended trajectory during placement due to varying bone density, leading to suboptimal positioning and potential jamming issues in guided surgery, especially with tapered bone-condensing implants.
Innovation Solution
A combination of a thread forming tool and implant with a tapering thread design, where the thread forming section's dimensions and pitch match the implant's, allowing for precise placement and uniform bone distribution, reducing deviations and improving stability through passive threading and guided surgery techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a tapered implant design is used for bone condensing, then bone condensation capability is improved, but trajectory deviation increases
Solution Approach 1:
The implant is divided into functionally distinct sections: a tapered apical portion for bone condensation and a coronal portion with different geometry for stable positioning. This segmentation allows each section to optimize its function without compromising the other, resolving the contradiction between bone condensation capability and trajectory accuracy.
Solution Approach 2:
Different portions of the implant have different geometric properties - the apical portion is tapered for bone condensation while the coronal portion has specific dimensional relationships that ensure trajectory control. This local differentiation of properties allows the implant to simultaneously achieve bone condensation and maintain accurate trajectory.
2Strength
If the implant diameter increases from apical to coronal end, then bone condensation is improved, but deviation from anticipated path increases
Solution Approach 1:
A thread forming tool is used to pre-create threads in the bone before implant insertion. This preliminary action prepares the bone structure to guide the implant along the correct trajectory, preventing deviation that would otherwise occur due to the implant's tapered design and varying bone density.
Solution Approach 2:
The thread forming tool acts as an intermediary that creates a preparatory thread structure in the bone. This intermediate structure serves as a guide pathway that constrains the implant during insertion, ensuring it follows the anticipated trajectory despite the implant's tapered geometry.
3Manufacturing precision
If guided surgery is used for precise placement, then positioning accuracy is improved, but jamming in guide sleeve occurs due to trajectory deviation
Solution Approach 1:
The thread forming tool creates preparatory threads in the bone that preemptively counteract the tendency of the tapered implant to deviate from the guide sleeve trajectory. By pre-shaping the bone structure, the system prevents the jamming issue before it occurs during implant insertion.
Solution Approach 2:
Threads are formed in the bone as a preliminary step before implant insertion. This preparatory action modifies the bone structure to accommodate the implant's tapered geometry while maintaining trajectory control, preventing guide sleeve jamming.
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 2a~2b
AI summary
A combination of, a thread forming tool and an implant is disclosed. The thread forming tool has a thread forming section with a helical thread having at least one cutting surface for cutting a thread in bone. The implant comprises a bone apposition surface having at least one helical thread for position at least partially in the thread of the bone. A longitudinal cross-sectional shape of at least a portion of the helical thread of the thread forming section substantially corresponds to a longitudinal cross-sectional shape of at least a portion of the helical thread of the implant.