Oscillating Capsulotomy Blade for Smooth Lens Capsule Cutting
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Solution Overview
Problem
Existing capsulotomy devices for cataract surgery often result in unintentional tears in the lens capsule due to uneven cutting forces, and there is a need for a more efficient mechanism to form a smooth and continuous aperture in the capsule during surgery.
Innovation Solution
A capsulotomy device with a cutting blade that oscillates rotationally about a central pivot through a simple mechanism involving an axially extending rod, allowing for precise cutting of the anterior lens capsule using a unitary one-piece construction with spoke members and a driving mechanism for manual or automatic activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hand-held cutting needle and forceps is used to form a continuous aperture in the capsule, then the capsule can be opened for lens removal, but unintentional tears in the capsule occur due to uneven cutting forces
Solution Approach 1:
The cutting blade is designed to oscillate between forward and backward positions during rotation, creating dynamic cutting action that allows controlled, even forces to be applied continuously to the capsule, preventing tears while maintaining ease of operation
Solution Approach 2:
The oscillating cutting blade performs periodic forward and backward movements during each rotation cycle, ensuring that cutting forces are distributed evenly over time and across the capsule surface, thereby preventing unintentional tears while maintaining continuous aperture formation
2Reliability
If a dedicated cutting tool with oscillating cutting element is used, then even cutting forces can be applied to avoid capsule tears, but the device complexity increases
Solution Approach 1:
The oscillating cutting action is combined with rotational movement in a single integrated blade assembly, where the blade both rotates and oscillates simultaneously, achieving reliable capsule cutting without requiring separate complex oscillating and rotating mechanisms
Solution Approach 2:
The cutting blade is designed to oscillate between forward and backward positions during rotation, creating dynamic cutting action that allows controlled, even forces to be applied continuously to the capsule, preventing tears while maintaining ease of operation
3Manufacturing precision
If multiple separate components are used in the cutting mechanism, then precise control of cutting forces is achieved, but the number of parts increases
Solution Approach 1:
The oscillating cutting action is combined with rotational movement in a single integrated blade assembly, where the blade both rotates and oscillates simultaneously, achieving reliable capsule cutting without requiring separate complex oscillating and rotating mechanisms
Solution Approach 2:
The cutting blade is segmented into multiple spokes radiating from a central pivot, with each spoke containing a cutting edge, allowing precise control of cutting forces through the spoke structure while maintaining a relatively simple overall part configuration
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 device provides a smooth and continuous cut in the lens capsule with reduced parts, minimizing unintentional tears and ensuring precise cutting during cataract surgery.
Implementation Method 1
at least a portion of the tool holder is adapted in the device's operative state to reciprocate in the distal and proximal directions to urge oscillating rotation of the cutting blade
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A capsulotomy device has a tool holder. The tool holder includes a cutting blade at its distal end and is arranged to move in a distal direction in the device to form an operative state of the device where the cutting blade projects out of a distal end of the capsulotomy device. The at least a portion of the tool holder is adapted in the device's operative state to reciprocate in the distal and proximal directions to urge rotation of the cutting blade.