Razor-like Cutting Edges for Tissue Resection
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Solution Overview
Problem
Existing tissue resection instruments face inefficiencies in cutting performance due to dull cutting edges, which require high rotational speeds to effectively remove tissue, leading to potential blade deformation and reduced effectiveness.
Innovation Solution
A motor-driven tissue resection device featuring a rotating inner sleeve with razor-like cutting edges and strengthening ribs, configured with acute sharpness angles less than 20° and 30° respectively, to enhance cutting efficiency while maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high rotational speeds are used to remove tissue with dull cutting edges, then tissue removal rate is improved, but blade deformation and reduced effectiveness occur
Solution Approach 1:
The patent changes the geometric parameters of the cutting edge by reducing the sharpness angle to less than 20°, which fundamentally alters the cutting mechanism from tearing to slicing. This parameter change allows effective tissue removal at lower rotational speeds, preventing blade deformation while maintaining high productivity
Solution Approach 2:
The patent applies local quality by creating a distinct razor-like edge section with different geometric properties (sharpness angle < 20°) compared to the rest of the cutting surface. This localized sharp edge concentrates stress effectively, enabling high tissue removal rates without requiring high rotational speeds that would cause blade deformation
2Productivity
If cutting edges are made sharper to improve cutting performance, then cutting efficiency is improved, but edge strength and durability decrease
Solution Approach 1:
The patent creates a localized razor-like edge section with acute sharpness angle (< 20°) that is spatially separated from the main cutting surface. This local sharp edge provides high cutting efficiency while the broader strengthening rib structure maintains overall edge strength and durability
Solution Approach 2:
The cutting edge is segmented into distinct functional zones: a razor-like edge section with sharpness angle < 20° for cutting, and a strengthening rib section with larger cross-section for structural support. This segmentation allows each zone to optimize its function without compromising the other
3Strength
If rotational speed is reduced to prevent blade deformation, then blade durability is improved, but tissue removal rate decreases
Solution Approach 1:
By changing the sharpness angle parameter to less than 20°, the patent transforms the cutting mechanism to require significantly lower rotational speeds for effective tissue removal. The razor-like edge geometry concentrates force more efficiently, maintaining high tissue removal rates even at reduced speeds, thus preserving blade durability
Data Source
AI summary
Methods and devices for resecting tissue from the interior of a patient's body using a inner and outer sleeves with respective cutting windows where an inner cutting window includes reinforced section to permit increased sharpness of sections of the inner window.