Intraocular Lens Cartridge Radial Lubricant Feed Duct
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Solution Overview
Problem
Existing cassettes for intraocular lenses in ophthalmic surgery often damage the lens during lubricant introduction due to inadequate hole design, hinder proper folding, and fail to maintain the lens's initial position, leading to complications during insertion.
Innovation Solution
A cassette design with pivoting parts forming a tubular chamber and a radial lubricant feed channel that allows lubricant introduction when closed, preventing direct contact with the lens and ensuring even distribution, thus minimizing damage and ensuring proper folding and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a small straight hole is used for lubricant introduction, then the cassette structure is simple, but the intraocular lens can be damaged when lubricant is injected
Solution Approach 1:
The feed channel is designed to extend radially from the cassette wall into the receiving chamber, changing the lubricant introduction path from axial (through the cap) to radial (through the cassette body). This dimensional change allows lubricant delivery without requiring the cap to be opened, preventing lens damage while maintaining structural simplicity
Solution Approach 2:
The feed channel is pre-formed as an integrated feature of the cassette body during manufacturing, eliminating the need for post-manufacturing modifications or complex assembly steps. The channel geometry is designed upfront to ensure safe lubricant delivery
2Object-affected harmful factors
If lubricant is introduced through a hole in the closed cassette, then lens protection is improved, but folding of the lens is hindered
Solution Approach 1:
The feed channel is positioned and sized to deliver lubricant locally to specific areas of the receiving chamber without creating obstacles in the folding path. The channel geometry is optimized to allow lens folding movements while maintaining effective lubricant distribution
3Object-affected harmful factors
If a recess in the cover is used for lubricant supply, then the cassette can be closed, but the needle can easily slip off and damage the lens
Solution Approach 1:
The lubricant introduction function is extracted from the cap assembly and integrated directly into the cassette body through the feed channel. This eliminates the need for cap opening and recess-based access, removing the risk of needle misalignment and lens damage while simplifying the lubricant supply operation
4Quantity of substance
If the feed channel extends too far into the receiving chamber, then lubricant distribution is improved, but the lens position can be altered
Solution Approach 1:
The feed channel geometry (length, diameter, orientation) is precisely controlled within specific parameter ranges to achieve optimal lubricant distribution while maintaining lens position stability. The radial extension distance is optimized to provide adequate lubricant flow without interfering with lens folding or final positioning
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 cassette design safely supplies lubricant to the intraocular lens without damaging it, ensuring proper folding and stable positioning within the injector, reducing the risk of complications during eye insertion.
Implementation Method 1
a lubricant supply device with which a fluid lubricant can be supplied, preferably radially, into the receiving chamber for the intraocular lens
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
The invention relates to a cartridge (6) for holding an intraocular lens (26), comprising two cartridge parts (7, 8) which can pivot relative to each other about a longitudinal axis (A) of the cartridge (6); one cartridge part (7) includes a channel-type main element (10) and an adjoining plate-type wing (11), and another cartridge part (8) includes a channel-type main element (12) and an adjoining plate-type wing (13); in the closed state of the cartridge (6), the two main elements (10, 12) form at least one portion of a holding chamber (16) for the intraocular lens (26); the cartridge (6) further comprises a lubricant feeding device (17) that allows a lubricant for the intraocular lens (26) to be fed into the holding chamber (16) from outside the cartridge (6) when the cartridge (6) is closed; the lubricant feeding device (17) includes a first feed duct (18) that is formed in one cartridge part (7, 8) and runs into the holding chamber (16); the disclosed cartridge (6) is characterized in that the first feed duct (18) is formed in a web (19) of one cartridge part (7), said web (19) extending into the holding chamber (16).