Square Cross-Section Arthroscope with Polymer RF Shield
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Solution Overview
Problem
Current arthroscopes with metal sheaths are prone to damage from RF currents, and the square CCD chips used in them result in wasted space, leading to inefficiencies in manufacturing and functionality.
Innovation Solution
An arthroscope with a square or rectangular lateral cross-section and a non-conductive polymer protective cap that positions LEDs at the proximal end of tubes, allowing for variable view angles and protecting the imaging chip from RF currents, while optimizing space for larger imaging chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular arthroscope is used to avoid tissue trauma, then tissue trauma is reduced, but space is wasted when housing square CCD chips
Solution Approach 1:
The patent applies asymmetry by transitioning from a traditional circular arthroscope to a rectangular cross-section design. This asymmetric shape change allows the arthroscope to efficiently house square CCD chips without wasted space, while the rounded corners of the rectangular shape maintain tissue compatibility. The asymmetric optimization resolves the contradiction between space efficiency and tissue trauma prevention.
2Strength
If a metal sheath is used for the arthroscope, then structural strength is provided, but the imaging chip is vulnerable to RF current damage
Solution Approach 1:
The patent introduces a non-conductive polymer coating as an intermediary layer between the metal sheath and the imaging chip. This intermediary material provides electrical insulation that protects the imaging chip from RF current damage while allowing the metal sheath to maintain its structural strength. The polymer coating acts as a mediator that resolves the contradiction between structural integrity and RF protection.
3Illumination intensity
If LEDs are positioned around the cap, then illumination is provided, but space for the imaging chip is reduced
Solution Approach 1:
The patent relocates LEDs from a circular arrangement around the cap to a linear arrangement at the proximal end of light pipes. This dimensional change from radial to linear positioning eliminates the need for a ring of LEDs, thereby maximizing the space available for the imaging chip while still providing adequate illumination through the light pipes. The spatial reconfiguration resolves the contradiction between illumination requirements and imaging chip space.
4Adaptability or versatility
If multiple view angle scopes are kept in stock, then various viewing angles are available, but device complexity and inventory management become cumbersome
Solution Approach 1:
The patent implements multi-functionality by designing a single arthroscope with the capability to provide multiple viewing angles (0, 30, and 70 degrees) through a deflectable imaging chip. This universal design eliminates the need to maintain multiple specialized scopes in inventory, as one scope can perform the functions of several. The multi-functional approach resolves the contradiction between viewing angle versatility and inventory complexity.
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
The solution reduces manufacturing costs, enhances image sensitivity, minimizes image noise, and provides protection from RF damage, allowing for a low-profile, versatile arthroscope with adjustable angles, improving surgical visibility and efficiency.
Implementation Method 1
because the cap is constructed of a non-conductive polymer, the imaging chip is isolated and therefore protected from stray RF current
Implementation Method 2
the position of the LEDs allows irrigation fluid passing through the inflow channel to cool off the imaging chips and imaging sensor
Data Source
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AI summary
An arthroscope having an elongated core with a square radial cross section.