Attenuated RF Capsulorhexis Probe for Capsule Integrity
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Solution Overview
Problem
Conventional methods for performing capsulorhexis in cataract surgery are challenging due to the difficulty in controlling cutting tools, leading to radial tears, vitreous loss, and complications such as retinal detachment and infection, and require skilled surgeons to achieve a continuous, circular opening that is properly sized and positioned for safe lens removal and intraocular lens placement.
Innovation Solution
A capsulorhexis apparatus using a probe with a pulse generator that delivers radio-frequency (RF) pulses with predetermined attenuation profiles to control energy delivery, ensuring efficient cutting without excessive coalescence or overheating, utilizing intra-pulse and inter-pulse attenuation techniques to maintain a localized thermal effect and reduce collateral damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cutting tools are used for capsulorhexis, then the procedure requires skilled surgeons to achieve a continuous circular opening, but this leads to radial tears, vitreous loss, and complications
Solution Approach 1:
The patent replaces mechanical cutting tools with an automated RF energy delivery system. The RF probe delivers controlled radiofrequency energy to the capsule tissue, creating a continuous circular opening without requiring manual manipulation of cutting instruments. This substitution eliminates the skill-dependent variability and mechanical tearing associated with conventional cystotome-based techniques.
Solution Approach 2:
The patent employs controlled RF energy parameters including specific power levels, pulse durations, and attenuation profiles to optimize capsule cutting. By precisely controlling the RF energy delivery parameters, the system achieves reliable continuous capsular openings while minimizing thermal damage and preventing radial tears, regardless of surgeon skill level.
2Productivity
If high energy RF pulses are used for efficient cutting, then the cutting speed improves, but excessive coalescence and overheating occur causing thermal damage
Solution Approach 1:
The patent uses pulsed RF energy delivery with specific pulse durations and inter-pulse intervals. This periodic action allows the tissue to cool between pulses, preventing excessive heat accumulation and coalescence while maintaining efficient cutting during the active pulse periods. The pulsed regime balances cutting efficiency with thermal safety.
Solution Approach 2:
The patent implements pre-set RF energy attenuation profiles that automatically reduce energy delivery as the cutting progresses. This preliminary anti-action prevents overheating and excessive coalescence before they can occur, by anticipating the thermal accumulation problem and counteracting it through controlled energy reduction during the procedure.
3Ease of operation
If manual capsular incision techniques are used, then the initial incision can be made, but controlling the path of the cutting tip is extremely difficult leading to tags and irregular openings
Solution Approach 1:
The patent replaces manual mechanical manipulation of cutting tips with an automated RF energy delivery system. The RF probe automatically creates the continuous circular opening through controlled energy delivery, eliminating the difficulty of manually controlling cutting tip path and the resulting tags and irregularities.
Solution Approach 2:
The RF energy delivery system is self-guiding along the intended capsular path. The energy naturally follows the curved path of the probe against the capsule, automatically creating a smooth circular opening without requiring manual coaxing or manipulation by the surgeon.
4Device complexity
If a small or misplaced capsular opening is created, then the initial procedure may be simpler, but the lens nucleus removal and intraocular lens insertion become more difficult increasing operation complexity
Solution Approach 1:
The automated RF capsulorhexis system provides real-time feedback through the surgeon's tactile sensation of probe contact and visual monitoring of the opening formation. This feedback ensures the probe follows the correct path and creates a properly sized and positioned circular opening, preventing the creation of small or misplaced openings that would complicate subsequent steps.
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 enables a safer and more controlled capsulorhexis procedure, reducing radial tears, improving capsule integrity, and facilitating proper lens placement, while minimizing thermal damage and complications like vitreous loss and secondary cataract formation.
Implementation Method 1
A capsulorhexis apparatus using a probe with a pulse generator that delivers radio-frequency (RF) pulses with predetermined attenuation profiles to control energy delivery, ensuring efficient cutting without excessive coalescence or overheating, utilizing intra-pulse and inter-pulse attenuation techniques to maintain a localized thermal effect
Data Source
AI summary
A capsulorhexis apparatus includes a capsulorhexis probe configured for insertion into an eye through an incision and a pulse generator configured to deliver at least one radio-frequency (RF) pulse to the capsulorhexis probe. The delivered RF pulse has a pre-determined attenuation profile such that the power level of the delivered RF pulse is substantially attenuated over the RF pulse's duration. In some embodiments, the pulse generator is configured to deliver a series of two or more RF pulses to the eye, such that the energy of each of the second and subsequent pulses of the series is substantially attenuated relative to the energy of the immediately preceding pulse.