Cannulated Screw Curved Head Guide Wire Alignment
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Solution Overview
Problem
Conventional cannulated screws face difficulties in accurately locating and inserting a guide wire during removal, especially when the fractured region is hard to identify visually, leading to inconvenience and potential misalignment.
Innovation Solution
A cannulated screw design featuring a head portion with a curved concave center surface and a washer with a concave surface, guiding the guide wire to the center and facilitating easy insertion into the connection hole, even when deviated, ensuring accurate and quick location and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional cannulated screw with a simple cylindrical head is used, then the structure is simple and easy to manufacture, but the guide wire cannot be easily located and inserted into the center hole during removal
Solution Approach 1:
The head portion is designed with a curved surface instead of a flat surface, creating a concave shape that naturally guides the guide wire toward the center hole. This curvature provides a self-aligning mechanism that facilitates accurate insertion without requiring complex positioning systems or additional components.
2Measurement precision
If the fractured region is difficult to identify with naked eyes, then the surgical precision is maintained, but the guide wire insertion becomes difficult and requires indirect checking with apparatus
Solution Approach 1:
The curved surface of the head portion serves as a self-guiding mechanism that automatically aligns the guide wire with the center hole. This self-service feature eliminates the need for external apparatus or indirect checking methods, allowing the structure itself to provide the alignment function that would otherwise require additional equipment.
3Reliability
If the guide wire deviates from the center portion, then the conventional design requires re-insertion, but the curved surface design guides the wire back to center
Solution Approach 1:
The curved surface provides continuous geometric feedback to the guide wire during insertion. As the guide wire contacts the curved surface, the geometry naturally directs it toward the center hole, providing real-time alignment feedback that corrects deviations without requiring removal and re-insertion of the wire.
Data Source
AI summary
A cannulated screw includes: a body portion that comprises a screw thread formed by protruding along an outer surface and has a through-hole at a center of the body portion; and a head portion that has one side surface combined to one end of the body portion, another side surface formed in a curved surface in which a center portion has a concave shape, and a connection hole communicating with the through-hole at a center of the head portion.