Self-filling Bone Screw with Cutting Teeth
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Solution Overview
Problem
Existing bone screw technologies require preparation of a core hole before insertion, which is time-consuming and may damage the bone structure, and they often need pre-filling with bone material for fusion.
Innovation Solution
A self-filling bone screw design with cutting teeth that engage the bone to create a hole and a bone thread to advance into it, eliminating the need for a pre-drilled hole and pre-filled material, allowing for minimal structural damage and integration with surrounding bone material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a core hole is prepared before insertion, then the bone screw can be inserted with proper alignment, but the procedure becomes time-consuming and causes additional structural damage to the bone
Solution Approach 1:
The cutting teeth are pre-configured on the bone screw to perform the hole creation function during insertion itself, eliminating the need for a separate preliminary core hole preparation step. The cutting teeth automatically engage and cut the bone as the screw is inserted, combining alignment and hole creation into one action.
2Reliability
If a core hole is prepared before insertion, then the bone screw can be inserted with proper alignment, but the bone structure suffers additional damage
Solution Approach 1:
The functions of alignment and hole creation are merged into a single insertion operation. The cutting teeth on the bone screw perform both the alignment guidance and the bone cutting simultaneously, eliminating the separate core hole preparation step that causes additional structural damage.
3Reliability
If the tubular body is pre-filled with bone material, then fusion can be promoted, but the procedure becomes more complex and time-consuming
Solution Approach 1:
The bone screw automatically collects and fills its own tubular body with bone material during the insertion process. The cutting teeth generate bone material in-situ that is directly captured and stored in the tubular body, eliminating the need for manual pre-filling operations and reducing procedural complexity.
4Reliability
If the tubular body is pre-filled with bone material, then fusion can be promoted, but the procedure becomes more time-consuming
Solution Approach 1:
The bone material collection and filling action is performed preliminarily during the insertion process itself. The cutting teeth generate and deposit bone material into the tubular body as the screw is being inserted, so that by the time insertion is complete, the tubular body is already filled and ready for fusion, eliminating separate pre-filling time.
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 quicker and less invasive bone screw implantation with minimal structural damage, promoting a more intact bone healing process and suitable for both strong and osteoporotic bones, while allowing for use in minimally invasive surgery.
Implementation Method 1
the cutting teeth engage the bone and create a hole
Implementation Method 2
the bone thread is configured to cut into the bone when the bone screw is screwed-in into the bone
Data Source
Figure 1~4
Figure 5~8
Figure 9~10
AI summary
A bone screw including a tubular body (1) with a bone thread (5) in at least a portion of its outer wall, the tubular body having an open first end (2) and an open second end (3); wherein at the open first end (2) a plurality of cutting teeth (4) is provided and wherein at the second end (3) a structure (31, 310) for engagement with a screwing-in tool (100) is provided.