Pulsed Laser Cataract Treatment for Localized Lens Micro-Disruption
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Solution Overview
Problem
Conventional cataract surgery methods face challenges such as uncontrolled tissue disruption, thermal and mechanical damage to adjacent tissues, and energy propagation issues due to ultrasound and laser-based techniques, which can harm delicate eye structures.
Innovation Solution
A laser-operated apparatus using pulsed laser radiation with specific wavelength and pulse duration for impulsive heat deposition, coupled through an optical waveguide, to achieve micro-disruption of cataractous lens tissue without significant thermal or acoustic effects on surrounding tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical tools are used to tear the lens tissue apart, then the cataract can be removed, but it is difficult and time consuming to carefully tear the lens tissue without creating uncontrolled stresses in the adjacent tissue
Solution Approach 1:
The patent replaces mechanical tools (scalpels, forceps) with ultrasonic energy to disrupt lens tissue. The ultrasonic transducer delivers controlled acoustic energy that emulsifies the cataractous lens material through cavitation and mechanical vibration, eliminating the need for manual tearing while providing precise control over the disruption process and minimizing uncontrolled stresses to adjacent tissues.
Solution Approach 2:
The patent utilizes changes in ultrasonic energy parameters (frequency, amplitude, pulse duration) to optimize lens tissue disruption while protecting surrounding structures. By controlling the ultrasonic energy delivery parameters, the system achieves effective emulsification of the cataract while limiting thermal and mechanical effects on adjacent healthy tissues.
2Productivity
If ultrasonic energy is used to disintegrate hard lens tissue, then the disruption is effective and quick, but thermal effects can result in heating or burning of the cornea
Solution Approach 1:
The patent employs pulsed ultrasonic delivery rather than continuous wave ultrasonic energy. By delivering ultrasonic energy in controlled pulses with appropriate duty cycles and intervals, the system achieves effective lens tissue emulsification during the pulse duration while allowing thermal dissipation during the intervals, thereby preventing cumulative heating and burning of the cornea and other adjacent structures.
Solution Approach 2:
The system dynamically adjusts ultrasonic parameters including pulse duration, repetition frequency, and amplitude to balance effective tissue disruption with thermal management. These parameter changes enable rapid emulsification of hard lens material while maintaining corneal temperature within safe limits.
3Productivity
If ultrasonic energy is used for phacoemulsification, then the lens structure is disrupted, but acoustic cavitation and shock waves can propagate and further perturb tissue centimeters away from the transducer
Solution Approach 1:
The patent introduces a phacoemulsification tip or probe as an intermediary between the ultrasonic transducer and the lens tissue. This intermediary structure confines and directs the ultrasonic energy and resulting cavitation bubbles primarily at the lens-material interface, preventing widespread propagation of shock waves through the aqueous humor to distant ocular structures such as the cornea and retina.
Solution Approach 2:
The phacoemulsification tip acts as a localized barrier that contains the acoustic cavitation effect. The tip design (including its geometry and material properties) helps confine the cavitation bubbles and shock waves to the immediate vicinity of the lens disruption site, preventing them from propagating centimeters away to affect other sensitive ocular tissues.
4Productivity
If conventional laser radiation is used to generate ultrasonic energy, then tissue can be disrupted, but the laser energy can propagate and damage other parts of the eye such as the cornea and retina
Solution Approach 1:
The patent replaces laser-based optical systems with direct electrical coupling to an ultrasonic transducer. This substitution eliminates the intermediate step of converting electrical energy to optical energy and back to mechanical ultrasonic energy, thereby preventing laser energy propagation through the ocular media. The direct electrical-to-mechanical energy conversion confines the ultrasonic energy generation to the transducer location, protecting the cornea and retina from laser exposure.
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
Efficient disruption of cataractous lens tissue with minimal propagation of energy to adjacent tissues, reducing the risk of thermal and mechanical damage, and enabling precise, controlled fragmentation.
Implementation Method 1
A laser-operated apparatus using pulsed laser radiation with specific wavelength and pulse duration for impulsive heat deposition, coupled through an optical waveguide, to achieve micro-disruption of cataractous lens tissue without significant thermal or acoustic effects on surrounding tissues
Data Source
AI summary
An apparatus for aiding the removal of cataracts in which an optical fiber delivers sufficient optical energy of the correct wavelength, pulse duration to achieve controlled non-thermal and non-acoustic dissolution of hard cataract tissue.