Infusion Pipe Arc Cross-Section for Ophthalmic Flow and Insertion
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Solution Overview
Problem
Conventional infusion pipes face difficulties in achieving a high flow rate and easy joining to cannulas attached to the eyeball during ophthalmic operations, due to the thin cannula piercing part and the circular cross-section of the insertion part, which restricts water flow and insertion ease.
Innovation Solution
The infusion pipe features an insertion part with an arc-shaped cross-section, where the arc height is between 30% and 90% of the virtual circular cross-section's outer diameter, facilitating easier insertion and increasing flow rate by reducing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the insertion part has a circular cross-section, then the structure is simple and easy to manufacture, but the flow rate is limited and insertion is difficult
Solution Approach 1:
The patent applies asymmetry by changing the cross-section of the insertion part from a symmetric circular shape to an asymmetric arc shape. This asymmetric design allows the insertion part to be inserted more easily into the cannula piercing part while maintaining a higher flow rate, directly resolving the contradiction between simplicity and performance.
Solution Approach 2:
The patent changes the geometric parameters of the insertion part by defining the arc height as a specific proportion (30-90%) of the outer diameter. This parameter optimization balances the flow rate enhancement with the insertion ease, transforming the design from a simple circular cross-section to an optimized arc-shaped cross-section.
2Ease of operation
If the cannula piercing part is made thin for easy insertion, then the insertion is easier, but the water flow capacity is reduced
Solution Approach 1:
The patent applies curvature by using an arc-shaped cross-section for the insertion part instead of a flat or circular shape. This curved geometry allows the insertion part to conform to the cannula piercing part more easily while maintaining adequate flow capacity through the optimized arc dimensions.
Solution Approach 2:
The asymmetric arc shape of the insertion part allows it to navigate the thin cannula piercing part more easily than a symmetric circular shape, while the specific arc height proportion ensures sufficient flow capacity is maintained despite the reduced dimensions.
3Productivity
If the insertion part diameter is increased to improve flow rate, then the flow rate increases, but the insertion becomes more difficult
Solution Approach 1:
The patent optimizes the parameters by setting the arc height to a specific proportion (30-90%) of the outer diameter. This parameter relationship allows the insertion part to maintain adequate flow rate while being thin enough to insert easily into the cannula piercing part, resolving the contradiction between flow rate and insertion ease.
Solution Approach 2:
The arc-shaped cross-section provides a curved geometry that facilitates easier insertion into the cannula piercing part compared to a flat or circular shape, while the optimized arc dimensions ensure sufficient flow rate capacity is maintained.
Data Source
AI summary
An infusion pipe capable of achieving a flow rate higher or the same as that of a conventional product, and of easily joining to a cannula attached to an eyeball. The infusion pipe of the present invention is used in an ophthalmic operation with the infusion pipe joined to a cannula attached to an eyeball, and includes an insertion part to be inserted, at the time of joining to the cannula, inside a cannula piercing part, which is a part of the cannula for piercing the eyeball. A cross-section of the insertion part is an arc shape from which a part of a circle is cut out.