Reflective Cannula Laser Energy Delivery
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Solution Overview
Problem
Conventional fiber-optic laser energy delivery devices face issues with erosion, aberrant energy emission, and reduced lifespan due to back-scatter and overheating, particularly when used in medical and industrial applications, where precise directional control and safety are critical.
Innovation Solution
The implementation of a laser energy conduit with a reflective material between the conduit and a hollow sheath, along with a transparent capillary tube, allows for controlled emission of laser energy at angles up to 60°, reducing aberrant emissions and overheating by reflecting stray energy and maintaining an air environment around the beveled distal end of the optical fiber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If laser energy is delivered at high power levels to vaporize tissue, then surgical effectiveness is improved, but the optical fiber and metal cannula become damaged due to back-scatter and aberrant emissions
Solution Approach 1:
A reflective coating (silver, gold, or dielectric) is applied to the interior surface of the metal cannula to act as an intermediary that redirects back-scattered laser energy away from the optical fiber and cannula walls. This mediator prevents direct interaction between harmful laser energy and the device components, allowing high power delivery without damage
Solution Approach 2:
The reflective coating converts the harmful back-scattered laser energy into a beneficial directional reflection that protects the device. The previously harmful aberrant emissions are redirected in controlled directions that prevent damage to the optical fiber and cannula, transforming the problem into a protective mechanism
2Adaptability or versatility
If the optical fiber is bent at sharp angles to navigate confined spaces, then access to target areas is improved, but laser energy leaks from the fiber due to exceeded bend radius limits
Solution Approach 1:
The reflective coating on the cannula interior serves as a mediator that captures laser energy attempting to escape from bent fiber sections and redirects it back toward the intended emission direction, preventing energy loss while allowing the fiber to be positioned at various angles
Solution Approach 2:
The reflective coating adds a dimensional element to the energy management system by creating a reflective environment within the cannula that redirects energy in three-dimensional space, allowing the fiber to bend in multiple directions without losing energy
3Productivity
If the distal end of the optical fiber is exposed to allow direct energy emission, then delivery efficiency is improved, but the fiber becomes vulnerable to erosion and damage from back-scatter
Solution Approach 1:
The reflective coating acts as a protective intermediary between the exposed fiber end and the back-scattered laser energy. It redirects harmful emissions away from the fiber while allowing the fiber to remain exposed for efficient energy delivery
Solution Approach 2:
The reflective coating provides beforehand protection by being applied to the cannula interior before the fiber is inserted and before laser delivery begins. This pre-established protective layer prevents erosion and damage throughout the procedure
4Strength
If metal cannula is used to protect the optical fiber, then mechanical protection is improved, but sparks are generated when laser energy vaporizes the metal due to aberrant emissions
Solution Approach 1:
The reflective coating serves as an intermediary that prevents aberrant laser emissions from directly striking the metal cannula walls. By redirecting these emissions, the coating eliminates the condition that causes metal vaporization and spark generation while maintaining the cannula's protective function
Solution Approach 2:
The reflective coating converts potentially harmful aberrant emissions into beneficial protective reflections. The energy that would otherwise damage the metal cannula is redirected in controlled directions, preventing spark generation while maintaining mechanical protection
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 solution enhances the efficiency and longevity of laser energy delivery, preventing damage to the device and surrounding tissues by ensuring precise directional control and reducing overheating, thereby improving safety and operational lifespan.
Implementation Method 1
a reflective material is positioned between the laser energy conduit and the hollow sheath for reflecting stray laser energy that is emitted from the laser energy conduit
Implementation Method 2
maintaining an air environment around the beveled distal end of the optical fiber
Data Source
AI summary
Improved laser energy delivery devices, providing greater transmission efficiency, longevity of use and safety are described. In one embodiment, a device for delivering laser energy includes a conventional optical fiber within a metal or plastic cannula provided with a laser energy emission window. A reflective material is disposed in a space between the distal end portion of a metal or plastic sheath and the optical fiber, as well as about any extension or endpiece of the distal end of the sheath. The reflective material reflects aberrant emissions of laser energy from the optical fiber as it erodes, and laser energy backscattered from the target tissue away from the distal end of the sheath back into the optical fiber or out of the distal end of the sheath, thereby preventing damage due to overheating. Other embodiments include devices that transmit laser energy more safely, efficiently and durably laterally from the axis of the optical fiber.