Pulsed Laser Cataract Lens Disruption With Reduced Tissue Stress
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Solution Overview
Problem
Conventional cataract surgery methods face challenges such as difficulty in carefully tearing lens tissue without causing uncontrolled stress, thermal and mechanical damage to adjacent tissues, and energy propagation issues leading to complications in the eye.
Innovation Solution
A laser-operated apparatus that utilizes impulsive heat deposition through a pulsed laser system with specific wavelength and pulse duration to achieve micro-disruption of cataractous lens tissue, minimizing energy propagation to surrounding tissues and incorporating irrigation and aspiration capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical tools are used to tear lens tissue apart, then the cataract can be broken down, 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 a laser-based system that uses photodisruption and acoustic cavitation to emulsify lens tissue. The laser probe delivers ultrasonic energy and optical radiation to break down cataract tissue without requiring mechanical tearing, thereby eliminating uncontrolled stresses on adjacent tissue while improving surgical efficiency.
Solution Approach 2:
The patent utilizes controlled changes in laser pulse duration, wavelength, and energy delivery parameters to achieve precise tissue disruption. By adjusting these parameters, the system can selectively emulsify cataract tissue while maintaining control over the extent and location of tissue disruption, preventing damage to surrounding structures.
2Productivity
If ultrasonic energy is used for phacoemulsification, then lens tissue can be effectively and quickly disintegrated, but thermal effects can result in heating or burning of the cornea
Solution Approach 1:
The patent introduces laser radiation as an intermediary mechanism to deliver energy to the lens tissue. Instead of relying solely on ultrasonic transducers that directly contact and heat the cornea, the laser probe delivers optical energy that is converted to mechanical and thermal effects at the focal point within the lens, minimizing direct thermal exposure to the cornea while maintaining effective tissue disintegration.
Solution Approach 2:
The system uses pulsed laser delivery with specific pulse durations and repetition rates to emulsify lens tissue. The periodic pulsed action allows for controlled energy deposition with intervals between pulses that prevent cumulative thermal buildup in the cornea, thereby maintaining surgical efficiency while protecting adjacent tissues from thermal damage.
3Productivity
If ultrasonic energy is used for phacoemulsification, then lens tissue can be broken down, but acoustic cavitation can propagate shock waves that perturb tissue centimeters away from the transducer
Solution Approach 1:
The patent employs a laser probe that delivers energy locally to the lens tissue with high spatial precision. The optical and acoustic energy is focused at the tip of the probe where the cataract tissue is located, creating localized emulsification without generating widespread shock waves that would perturb distant tissues. This localised energy delivery maintains effectiveness while minimizing harmful propagation.
4Productivity
If ultrasonic energy is used for phacoemulsification, then lens tissue can be emulsified, but free radicals formed during cavitation can damage delicate endothelial cells on the back surface of the cornea with oxidative stress
Solution Approach 1:
The patent replaces the ultrasonic cavitation mechanism that generates free radicals with a laser-based photodisruption mechanism. The laser energy directly breaks molecular bonds and emulsifies tissue through optical field effects rather than acoustic cavitation, thereby achieving effective lens emulsification without forming the free radicals that cause oxidative damage to corneal endothelial cells.
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 reduced thermal and acoustic exposure to adjacent tissues, preventing damage to the cornea and retina, and maintaining stable intraocular pressure.
Implementation Method 1
A source of pulsed laser radiation, the source being controllable to select a pulsing rate of the pulsed laser radiation; an optical waveguide configured to transmit the pulsed laser radiation from the source
Implementation Method 2
the light intensity which exits the optical waveguide is sufficient to produce microdisruption of the lens tissue by impulsive heat deposition
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.