Optical Fiber Ferrule Laser Welding for Sterilization-Resistant Bonding
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Solution Overview
Problem
Existing methods for coupling optical fibers to ferrules in surgical instruments, such as adhesives and soft soldering, are prone to failure due to heat, chemicals, and affect optical energy transmission, leading to unreliable connections.
Innovation Solution
Laser welding is used to fuse optical fibers to ferrules, creating a secure and reliable bond that maintains optical performance and withstands high temperatures and chemical exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesives are used to bond optical fibers to ferrules, then the bonding process is simple, but the connection is prone to failure under heat and chemical exposure
Solution Approach 1:
The patent replaces adhesive bonding (chemical system) with laser welding (thermal/physical system). The laser beam melts and fuses the optical fiber to the ferrule, creating a metallurgical bond that eliminates the reliability issues of adhesives under heat and chemical exposure while maintaining manufacturing simplicity through automated laser processing
Solution Approach 2:
The patent changes the bonding mechanism from low-temperature adhesive curing to high-temperature laser welding. This parameter change in bonding temperature and energy input creates a fundamentally different bond type that withstands autoclaving and chemical sterilization processes that would degrade adhesive bonds
2Strength
If soft soldering is used to couple optical fibers, then the connection provides mechanical strength, but it affects optical energy transmission
Solution Approach 1:
The patent replaces soft soldering (metallurgical joining with filler metal) with direct laser welding (fusion welding). This eliminates the introduction of foreign solder materials that could interfere with optical transmission, while the precise laser melting and fusion process maintains strong mechanical bonding between the optical fiber and ferrule
Solution Approach 2:
The patent extracts the harmful element (solder material) from the bonding process. By using direct laser welding without filler metals, the process eliminates materials that could contaminate or interfere with optical energy transmission while still achieving the necessary mechanical strength through direct fusion of the base materials
3Ease of manufacture
If existing bonding methods are used, then the process is straightforward, but the connection fails under autoclaving conditions
Solution Approach 1:
The patent fundamentally changes the bonding temperature parameter from room temperature adhesive application to high-temperature laser welding. This creates a bond that is inherently resistant to subsequent thermal cycling during autoclaving, as the laser-welded joint can withstand temperatures significantly higher than those encountered during sterilization
Solution Approach 2:
The laser welding process creates a pre-strengthened bond that cushions against subsequent thermal stress. The high-temperature fusion bond created beforehand provides a safety margin that protects the connection during autoclaving, preventing the failure that would occur with adhesive-bonded joints exposed to the same thermal conditions
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 laser-welded connections provide improved chemical, mechanical, and temperature resistance, reducing the risk of failure and maintaining effective optical energy transmission.
Implementation Method 1
applying a laser beam to the end of the optical fiber, wherein the laser beam melts a portion of the optical fiber
Implementation Method 2
applying a laser beam to the end of the optical fiber, wherein the laser beam melts a portion of the optical fiber
Implementation Method 3
securing, through the cooling of the melted portion of the optical fiber, the optical fiber to the ferrule
Data Source
AI summary
Certain embodiments disclosed herein provide systems and methods for coupling an optical fiber to a ferrule. For example, certain aspects provide a method for coupling an optical fiber to a ferrule including inserting the optical fiber through a ferrule such that an end of the optical fiber protrudes beyond an end of the ferrule and applying a laser beam to the end of the optical fiber, wherein the laser beam melts a portion of the optical fiber. The method further includes securing, through cooling of the melted portion of the optical fiber, the optical fiber to the ferrule, wherein the laser beam melts a portion of the optical fiber to create a fluid which seals the optical fiber to the ferrule upon solidifying.