Surgical Scissors With Lateral Restraint Channel
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Solution Overview
Problem
Conventional surgical scissors are ineffective in cutting tough fibrous tissues like ligaments, prone to blade splaying, and often require frequent sharpening and replacement due to misalignment and lack of robustness, leading to imprecise cuts and increased procedural time.
Innovation Solution
The design incorporates a channel member on the handle portions that extends to restrain relative lateral movement of the blade portions, preventing splaying and maintaining alignment during cutting, achieved through a U-shaped or closed loop configuration that is integral or attached to the handle, allowing for effective cutting of tough tissues without increasing bulk or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If stiffer blades are used to prevent splaying, then blade stability is improved, but the scissors become bulkier and heavier
Solution Approach 1:
The invention introduces a restraining member that extends laterally beyond the handle portion in a direction perpendicular to the cutting plane, constraining blade movement in a different dimensional space rather than increasing blade thickness in the original plane
Solution Approach 2:
The restraining member acts as an intermediary element between the handle portions, providing lateral constraint without requiring the blades themselves to be thicker or stiffer
2Stability of the object's composition
If thicker blades are used to prevent splaying, then blade stability is improved, but the scissors become heavier and more expensive to manufacture
Solution Approach 1:
The restraining member extends laterally beyond the handle portion in a direction perpendicular to the cutting plane, constraining blade movement in a different dimensional space rather than increasing blade thickness
Solution Approach 2:
The restraining member serves as an intermediary structure that provides lateral constraint without requiring increased blade thickness or weight
3Ease of manufacture
If conventional pivot pins are used to hold blades together, then ease of manufacture is improved, but blade alignment deteriorates due to loosening
Solution Approach 1:
The restraining member replicates the alignment function previously provided by the pivot pin, creating a redundant constraint system that maintains blade alignment even when the pivot pin loosens
Solution Approach 2:
The restraining member provides preventive constraint against lateral movement before misalignment can occur, compensating for potential pivot pin loosening during use
Data Source
AI summary
Scissors, especially surgical scissors, having first and second elongate members each having a handle portion and a blade portion and being connected by a pivot between the handle portions and the blade portions for relative pivotal movement generally in a cutting plane during a cutting stroke. At least one of the handle portions supports a channel member having a length that extends toward, embraces and extends beyond the handle portion of the other elongate member to restrain movement of the handle portions out of the cutting plane and thus to resist relative lateral movement of the blade portions away from each other during the cutting stroke. The scissors are robust and are able to cleanly, effectively and accurately cut tough or slippery items which might otherwise cause the blades to splay away from each other.