Endoscopic Instrument Curved Disk Force Transmission
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Solution Overview
Problem
Endoscopic instruments with thin shank diameters face challenges in transmitting sufficient forces to the tool, particularly when the instrument head needs to be pivotable, due to design constraints and the need for versatility in application through narrow openings.
Innovation Solution
The use of two curved disks of different radial sizes, where the larger disk is positioned closer to the tool axis and the smaller disk further out, optimizes force transmission by varying the moment applied to the jaw parts based on the application purpose, allowing for higher forces in specific directions and additional degrees of freedom in pivot movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the shank diameter is reduced to enable passage through narrow openings, then the versatility and accessibility of the instrument is improved, but the force transmission capability to the tool is deteriorated
Solution Approach 1:
The patent transitions from a single-dimension force transmission approach to a two-dimensional arrangement by positioning curved disks at different radial distances from the tool axis. This dimensional change allows force application in multiple directions while maintaining a compact shank diameter, resolving the contradiction between small size and force capability.
Solution Approach 2:
The patent changes the radial position parameter of the curved disks relative to the tool axis. By varying the radial distance, the moment arm is optimized to maximize force transmission in specific directions, enabling sufficient force application despite the reduced shank diameter.
2Length of moving object
If the shank diameter is reduced, then the instrument can be led through narrow openings, but the ability to muster necessary forces in the tool is deteriorated
Solution Approach 1:
The patent applies local quality by concentrating force transmission at specific radial positions rather than uniformly distributing it. The curved disks are strategically positioned at different radial distances to create localized force application points, maximizing force magnitude in critical areas while maintaining overall compact dimensions.
3Adaptability or versatility
If the instrument head is made pivotable, then the versatility of application is improved, but the complexity of force transmission mechanism is increased
Solution Approach 1:
The curved disks serve multiple functions: they transmit force from the pull means, enable pivot movement of the instrument head, and provide directional force control. This multi-functionality reduces the need for separate mechanisms, thereby limiting the increase in complexity despite the added pivot capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables the application of larger forces in desired directions, enhances the versatility of the instrument by allowing pivot movement in both directions, and reduces manufacturing costs through the use of identical components, while maintaining efficient force transmission with minimal friction loss.
Implementation Method 1
the radial distance of the curved disk to the rotation axis is decisive for the force to be applied onto the respective jaw part, since this with a given force determines the moment with which the jaw part can be moved
Data Source
AI summary
An endoscopic instrument includes a shank (2) with an instrument head (9) arranged at the distal shank end (1) and includes a tool with two jaw parts (11, 12). The jaw parts (11, 12) are pivotable relative to one another and can be controlled from the proximal instrument end via a pull elements (5-8) led in the shank (2). At least one jaw part (11, 12) includes two curved disks (36, 37), on which the pull elements (5-8) engages in each case. Two curved disks (36, 37) of a different radial size are provided for each jaw part (11, 12). The radially larger curved disk is arranged closer to the longitudinal middle axis (14) of the tool than the radially smaller curved disk.