Capsular Bag Size Measurement Using Optical Angle Indicator
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Solution Overview
Problem
Current methods for measuring the capsular bag size in the eye are inaccurate and often require linear measurements at the periphery, which is challenging due to corneal variations and the need for invasive procedures, limiting the precision of accommodating intraocular lens implantation.
Innovation Solution
An angle indicator is inserted into the capsular bag, which expands to match the bag's size, allowing for the measurement of the angle between its arms to determine the bag's diameter, providing a more accurate and non-invasive method independent of corneal magnification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultrasound is used to measure capsular bag size, then central thickness of the natural crystalline lens can be determined, but it cannot reliably read out to the perimeter of the lens and cannot image the entire lens
Solution Approach 1:
The patent replaces ultrasound (acoustic field) with optical methods (camera imaging) to measure capsular bag size. The optical system can capture images of the entire lens and capsular bag structure, allowing measurement from the center to the perimeter, overcoming the limitations of ultrasound in this regard.
Solution Approach 2:
The patent introduces a camera as an intermediary device to capture images of the capsular bag and lens. This intermediary allows non-contact measurement of the entire structure without requiring invasive insertion of measurement tools like the capsular tension ring.
2Measurement precision
If a capsular tension ring is inserted into the eye to measure capsular diameter, then linear measurement of peripheral gap can indicate capsular diameter, but the ring remains resident in the eye which may be undesirable
Solution Approach 1:
The patent uses a camera as an intermediary to capture images of the capsular bag from outside the eye. This allows measurement of capsular diameter without inserting any physical ring or marker into the eye, eliminating the harmful effect of foreign object presence while maintaining measurement accuracy.
Solution Approach 2:
The patent replaces the mechanical insertion of a capsular tension ring with an optical imaging system. The camera captures images that can be analyzed to determine capsular diameter, eliminating the need for physical insertion and subsequent presence of a foreign object in the eye.
3Ease of operation
If linear dimension is measured through the cornea using a camera, then measurement can be taken, but corneal variations and magnification effects reduce measurement accuracy
Solution Approach 1:
The patent uses a camera as an intermediary to capture images of the capsular bag and lens from outside the eye. By measuring the image dimensions rather than attempting to measure through the cornea, the system avoids corneal magnification effects while maintaining non-invasive operation.
Solution Approach 2:
The patent replaces direct linear measurement through the cornea with optical imaging. The camera captures the entire capsular bag and lens structure, allowing measurement of actual dimensions without being affected by corneal variations or magnification, thereby improving precision while maintaining ease of operation.
4Productivity
If accommodating intraocular lens is inserted without accurate capsular bag size measurement, then implantation can proceed, but the lens may end up slightly expanded or squeezed resulting in shift in nominal base power and reduction in accommodation range
Solution Approach 1:
The patent performs capsular bag size measurement using optical imaging before the intraocular lens implantation surgery. This preliminary measurement allows for accurate preoperative planning and selection of the appropriate lens size, ensuring precise fit and avoiding postoperative power shifts or reduced accommodation range.
Solution Approach 2:
The patent replaces inaccurate mechanical measurement methods with optical imaging to determine capsular bag size before surgery. This substitution provides more reliable and accurate measurements, enabling precise lens selection and implantation while maintaining surgical efficiency.
Data Source
AI summary
A system for measuring the size of a capsular bag of an eye of a subject includes a size indicator and a sizing gauge. The size indicator is configured for insertion into a capsular bag and includes a peripheral portion and a pair of arms. The peripheral portion is configured to engage the capsular bag. Each of the arms has a proximal end and a distal end, the arms being joined to one another at the proximal ends. The peripheral portion is joined to the distal ends of the arms. The arms form an angle that depends on a size of the capsular bag into which the size indicator is placed.