Surgical Chisel Bent Blade Hammered Portion Alignment
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Solution Overview
Problem
In minimally invasive surgery for lumbar spinal canal stenosis, conventional angled chisels fail to advance in the direction of the blade due to the location of the hammered point, leading to inadequate bone cutting and increased risk of facet joint instability.
Innovation Solution
A surgical chisel with a bent blade and a hammered portion that extends opposite to the blade direction, allowing precise adjustment for advancing the chisel along the blade's direction, even when the tip is not initially inserted into the bone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the hammered point is located on the end of the handle for gripping, then the chisel is easy to grip and operate, but the chisel slides on the bone surface instead of advancing in the direction of the blade
Solution Approach 1:
The patent introduces an extended line portion as an intermediary element between the handle and the hammering surface. This extension redirects the hammering force along the extended line to align with the blade direction, mediating between the grip position and the cutting action to prevent sliding while maintaining grip comfort
2Productivity
If the chisel is hammered to advance the blade, then bone cutting is achieved, but the chisel slides on the bone surface when the tip is not inserted into the bone
Solution Approach 1:
The patent implements preliminary action by extending the handle to position the hammering point such that the extended line passes through or near the blade tip. This pre-positioning ensures that when hammering begins, the force is already aligned with the blade direction, preventing sliding before the blade tip inserts into the bone
3Productivity
If extensive bone is excised to achieve sufficient decompression at the approach side, then the spinal canal is adequately expanded, but facet joint instability increases
Solution Approach 1:
The patent applies local quality by enabling precise, localized bone removal through improved chisel control. The extended line mechanism allows the surgeon to target specific bone portions at the approach side with greater accuracy, removing only the necessary bone for decompression while preserving adjacent facet joint structures
Data Source
AI summary
A chisel includes a hammered portion to be hammered which is provided so as to project from a middle or an end of a handle and extend to pass through a portion on an extended line in the direction opposite to the direction of the blade. Even if the chisel is hammered in a state where a tip of the blade thereof is not inserted into a bone, the chisel easily advances in the direction of the blade, thereby reducing a possibility that the blade slides on a surface of the bone.