Flat-Tip Vitrectomy Probe Retinal Safety
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Solution Overview
Problem
Conventional vitrectomy probes have limitations in proximity to the retina due to their geometry, restricting the removal of overlying vitreous humor before underlying retina procedures, which can lead to traction or tears.
Innovation Solution
A vitrectomy probe with a tubular body and a distal tip featuring a flat outer and inner surface, manufactured using an improved spin forming or resistance welding process, allowing for a closer approach to the retina without contact, enabling more effective vitreous removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional vitrectomy probe geometry is used, then the probe can be manufactured with standard designs, but the probe cannot approach closer to the retina without contact risk
Solution Approach 1:
The patent applies curvature by forming the distal tip of the tubular body with a spherical geometry. This curved, rounded tip eliminates sharp edges and allows the probe to approach the retina more closely without risking contact or trauma. The spherical shape is achieved through spin forming or resistance welding processes that create a smooth, rounded distal surface.
Solution Approach 2:
The patent applies local quality by creating a flat inner surface at the distal tip while maintaining a rounded outer shape. This localized flat surface provides a reference plane for port positioning and cutting geometry, while the overall spherical tip ensures safety near the retina. The port is positioned at a specific distance from this flat inner surface to optimize cutting performance.
2Productivity
If the port is positioned closer to the retina for better vitreous removal, then more extensive vitreous can be removed, but the risk of retinal traction or tears increases
Solution Approach 1:
The spherical distal tip geometry allows the port to be positioned closer to the retinal surface while maintaining a safe distance through the curved profile. The rounded shape acts as a buffer that prevents direct contact between the port or cutting members and the retina, enabling more aggressive vitreous removal without increasing retinal trauma risk.
3Manufacturing precision
If standard spin forming or resistance welding processes are used, then manufacturing is straightforward, but achieving precise flat surfaces at the distal tip is difficult
Solution Approach 1:
The patent applies preliminary action by forming the spherical distal tip first through spin forming or resistance welding, then subsequently machining or finishing the inner surface to create the precise flat reference plane. This sequence allows the curved outer shape to be established before the precise flat inner surface, making the manufacturing process more feasible than attempting to create both simultaneously.
Solution Approach 2:
The patent replaces traditional mechanical machining processes with spin forming or resistance welding for creating the spherical distal tip. These alternative processes can more easily produce precise curved surfaces and flat reference planes compared to conventional mechanical machining, particularly for small-scale ophthalmic instruments.
Data Source
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AI summary
Microsurgical probes having a distal tip with a flat outer surface and a flat inner surface, and methods of forming such probes, are disclosed.