Intralenticular Lens Fixation via Laser-Ablated Fastening Region
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Solution Overview
Problem
The challenge in lens surgery is the limited predictability of refractive results due to inaccuracies in the positioning and alignment of intraocular lenses, particularly caused by the haptics attached to the lens body, which can lead to refractive errors and dissatisfaction in patients.
Innovation Solution
An apparatus and method using a laser device to create a precise accommodation space within the eye lens with a peripheral fastening region for an intralenticular intraocular lens, eliminating the need for haptics by defining a single axial position for the lens body, ensuring precise alignment and preventing vitreous humor prolapse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If haptics are attached to the lens body for fixation, then the intraocular lens can be positioned in the capsular bag, but the positioning accuracy and alignment predictability deteriorate due to haptics-induced inaccuracies
Solution Approach 1:
The patent removes the haptics component from the intraocular lens structure entirely. Instead of attaching fixation elements to the lens body, the invention creates a fastening region directly in the eye lens tissue through laser ablation that accommodates the lens body without requiring separate fixation structures. This extraction of haptics eliminates the source of positioning inaccuracies while simplifying the overall system.
Solution Approach 2:
The patent replaces the mechanical haptic-based fixation system with a laser-created fastening region in the eye lens tissue. The femtosecond laser ablates precise cavities and fastening structures directly into the lens capsule and lens tissue, substituting mechanical attachment elements with a precisely engineered tissue-based anchoring system that provides superior positioning accuracy.
2Adaptability or versatility
If multiple axially spaced apart annular grooves are created for haptic engagement, then the surgeon can choose relative position along the ocular axis, but the positioning precision and alignment accuracy deteriorate
Solution Approach 1:
The patent removes the multiple annular grooves and haptic engagement structures entirely. Instead of creating multiple potential engagement zones that compromise precision, the invention creates a single, precisely defined fastening region in the eye lens at the optimal axial position, determined by preoperative biometry measurements, eliminating the need for multiple positioning options that reduce accuracy.
Solution Approach 2:
The patent performs preliminary planning using biometry measurements to determine the exact axial position and dimensions of the fastening region before surgery. The femtosecond laser creates the precisely positioned fastening region and accommodation space in advance during the same surgical procedure, eliminating the need for multiple grooves that would require intraoperative selection and compromise precision.
3Reliability
If the intraocular lens is fixed in a predetermined axial position without haptics, then positioning stability improves, but the device complexity increases due to laser-based fastening region creation
Solution Approach 1:
The patent combines the lens implantation procedure with the creation of the fastening region into a single integrated process. The femtosecond laser both creates the accommodation space and the fastening region in the eye lens tissue during the same surgical procedure, merging multiple steps into one cohesive treatment that achieves stable positioning without requiring complex separate fixation devices.
Solution Approach 2:
The patent replaces complex mechanical haptic-based fixation systems with a laser-ablation-based fastening region created directly in the eye lens tissue. The femtosecond laser precisely ablates the fastening region and accommodation space, substituting mechanical attachment structures with a tissue-engineered anchoring system that provides superior positioning stability.
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 approach provides a more stable and precise positioning of the intraocular lens, reducing the risk of refractive errors and secondary cataracts by ensuring the lens is fixed in a predetermined position, thereby enhancing the accuracy of optical correction and maintaining the natural separation between eye chambers.
Implementation Method 1
a laser device for separating tissue of the eye lens and capsular bag in a focus of pulsed laser radiation. The laser device emits pulsed laser radiation and focuses the latter into the eye
Data Source
AI summary
An apparatus for refractive lens surgery on the human eye, including: a laser device for separating tissue of the eye lens and capsular bag in a focus of pulsed laser radiation, a focus positioning device for setting and adjusting a location of the focus, a measuring apparatus for gathering the relative position of the eye lens and capsular bag, and a control device which reads data from the measuring apparatus and controls the focus positioning device, and which is designed to define and specify a pattern for the focus to the focus positioning device, the pattern separating tissue layers in the eye lens for the purposes of generating an accommodation space for an intralenticular intraocular lens. The accommodation space includes a cutout for a dimensionally-stable lens body of the intraocular lens and a peripheral fastening region for fixing the dimensionally-stable lens body at a single, predetermined, axial position.