Vertebral Surgery Instrument Guide Passage Design
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Solution Overview
Problem
Existing vertebral surgery instruments, such as those described in Japanese Patent No. 4574931, are complex and require a long assembly time, with limited movable range of the fixation rod, making it difficult to smoothly insert the rod into slits in vertebral implants.
Innovation Solution
A vertebral surgery instrument featuring an engagement part and guide parts that separate to guide the fixation rod into the slit, allowing for easy insertion with a simple configuration, and optionally including a cap part to restrict opposing parts and reduce the risk of breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pivot arm mechanism is used to insert the fixation rod, then the fixation rod can be inserted into the slits, but the instrument becomes complex and assembly time increases
Solution Approach 1:
The instrument is divided into a body and a separate guide part that can be attached to or integrated with the body. This segmentation allows the guide part to be positioned independently to facilitate fixation rod insertion without requiring a complex pivot arm mechanism, thereby simplifying the overall instrument structure while maintaining ease of operation.
Solution Approach 2:
The guide part serves as an intermediary element between the operator and the fixation rod. It provides a guided passage that directs the fixation rod into the slit of the vertebral implant, eliminating the need for complex pivot arm mechanisms while ensuring accurate and easy insertion.
2Stability of the object's composition
If a pivot arm swings along a predetermined plane, then the mechanism is constrained, but the movable range of the fixation rod is limited and smooth insertion becomes difficult
Solution Approach 1:
The guide part is designed to be dynamically adjustable or positionable, allowing it to adapt to different insertion angles and positions. This dynamic capability enables the fixation rod to be inserted smoothly without being constrained to a predetermined plane, while the guide part itself maintains structural stability during the insertion process.
3Ease of operation
If the engagement part engages with outer portions of opposing parts, then passage width is secured for smooth insertion, but the outer shape of the instrument becomes larger
Solution Approach 1:
The engagement part is designed to engage with specific local portions of the opposing parts (either inner or outer portions depending on the configuration). This localized engagement strategy allows the instrument to maintain a compact overall size while still providing sufficient passage width at the critical insertion point, balancing instrument miniaturization with ease of operation.
Data Source
AI summary
A vertebral surgery instrument includes: an engagement part for engaging with a pair of opposing parts provided on or attached to a vertebral implant in a state in which the vertebral implant is fixed to a vertebra, the pair of opposing parts forming a slit into which a fixation rod for fixing a plurality of vertebrae to each other is to be inserted; and a pair of guide parts that are provided integrally with or attached to the engagement part. The pair of guide parts are formed extending so as to separate from each other toward a side on which the fixation rod is to be inserted, in a state in which the engagement part is engaged with the pair of opposing parts, and the slit and a guide passage that is formed between the pair of guide parts are in communication with each other.