Adjustable Ligation Instrument Jaw Gap Width for Tissue Necrosis Prevention
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Solution Overview
Problem
Existing ligation instruments face challenges in accurately placing a ligation instrument on a target organ with the appropriate pinching force, leading to potential tissue necrosis from excessive force or secretion leakage due to insufficient tightening.
Innovation Solution
A system comprising a ligation instrument with rotatably connected jaw parts and an adjustable locking feature, along with an assistive device that includes a shaft, launch pad, handling feature, and transmission feature, allowing for precise adjustment of the pinching force and placement of the ligation instrument on the target organ.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ligation instrument is placed with excessive pinching force to ensure secure ligation, then the reliability of ligation is improved, but tissue necrosis occurs due to excessive force
Solution Approach 1:
The patent applies parameter changes by providing multiple predetermined gap widths (first gap width larger than second gap width) that correspond to different pinching forces. The locking feature can be set at different positions to achieve different gap widths, allowing the pinching force parameter to be adjusted between a first level (larger gap) and a second level (smaller gap), thereby resolving the contradiction between reliable ligation and tissue damage prevention
Solution Approach 2:
The patent implements dynamics by making the gap width adjustable through the locking feature's movable positioning mechanism. The gap width is not fixed but can be dynamically changed between predetermined positions during the ligation process, enabling adaptation to different tissue types and surgical requirements while maintaining appropriate pinching force
2Object-affected harmful factors
If the ligation instrument is placed with insufficient pinching force to avoid tissue damage, then tissue necrosis is prevented, but secretion leakage occurs due to inadequate tightening
Solution Approach 1:
The patent resolves this contradiction by providing multiple pinching force parameters through different gap widths. The first gap width provides smaller pinching force suitable for preventing tissue necrosis in delicate tissues, while the second gap width provides larger pinching force for ensuring secure ligation and preventing secretion leakage in tissues requiring stronger compression
Solution Approach 2:
The patent applies local quality by allowing different pinching force levels to be applied to different target organs or tissue types based on their specific requirements. The locking feature enables selection of appropriate gap width for each specific surgical situation, tailoring the pinching force to the local tissue characteristics
3Adaptability or versatility
If the pinching force is made adjustable to optimize ligation for different tissues, then the adaptability is improved, but the device complexity increases due to additional adjustment mechanisms
Solution Approach 1:
The patent applies segmentation by dividing the locking feature into distinct components: a movable portion that can be positioned at different locations and a fixed portion with predetermined positioning positions. This segmented structure allows simple movement between discrete gap width positions without requiring complex continuous adjustment mechanisms
Solution Approach 2:
The patent implements dynamics through the movable portion of the locking feature that can be easily repositioned between predetermined locations. This provides adjustable pinching force capability while maintaining relative simplicity, as the movement is constrained to discrete positions rather than requiring continuous control
4Object-affected harmful factors
If the gap width between jaw parts is increased to reduce pinching force, then tissue necrosis is prevented, but the ligation security is reduced
Solution Approach 1:
The patent directly addresses this contradiction by providing multiple predetermined gap width parameters. The first gap width (larger) is optimized for preventing tissue necrosis by reducing pinching force, while the second gap width (smaller) is optimized for improving ligation security by increasing pinching force. The locking feature enables selection between these parameters based on surgical requirements
Data Source
AI summary
Ligation instrument comprising a first jaw part having a distal end and a proximal end, a second jaw part having a distal end and a proximal end and a locking feature; wherein the first jaw part and the second jaw part are configured to be rotatably connected around their respective proximal end sides; the locking feature is composed of a combination of a portion installed on the distal end side of the first jaw part and a portion installed on the distal end side of the second jaw part, the locking feature is configured to connect between the distal end side of the first jaw part and the distal end side of the second jaw part so that a target organ can be held between an inner surface of the first jaw part and an inner surface of the second jaw part, a width of a gap between the inner surface of the first jaw part and the inner surface of the second jaw part can be adjusted and a force with which the target organ is compressed can be changed by adjusting the width.