Suction Instrument Varying Inner Diameter Cannula
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Solution Overview
Problem
Existing suction instruments for anatomical passageways often face issues with obstructions due to tissue and debris accumulation, particularly in areas difficult to access, which can prolong medical procedures and complicate the application of effective suction during ENT surgeries.
Innovation Solution
The design of a suction instrument with a cannula featuring a varying cross-sectional area along its length, where the smallest area is located at the distal end, facilitating easy access and clearance of obstructions, and potentially incorporating a tapered interior surface to prevent clogs through turbulent flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a suction instrument with constant inner diameter is used, then the structure is simple and easy to manufacture, but obstructions occur frequently in hard-to-reach areas and are difficult to clear
Solution Approach 1:
The cannula is designed with a varying inner diameter where the distal portion has a smaller diameter than the proximal portion. This local variation in geometry creates a tapering effect that directs debris toward the narrower distal end, preventing obstructions from forming in hard-to-reach areas while maintaining overall structural simplicity
Solution Approach 2:
Instead of the conventional design where the largest diameter is at the distal end for maximum debris collection, this invention inverts the approach by having the smallest diameter at the distal end. This reversal prevents debris accumulation by creating a geometry that naturally channels material toward the opening, eliminating the need for complex clearing mechanisms
2Quantity of substance
If the distal end of the cannula has a larger diameter, then debris collection capacity is improved, but obstructions become more likely and harder to clear
Solution Approach 1:
The cannula employs local quality variation by having different diameters at different portions. The proximal portion maintains a larger diameter for adequate debris collection capacity, while the distal portion transitions to a smaller diameter to prevent obstruction formation, optimizing both collection and clearance functions through localized geometric differences
Solution Approach 2:
The varying diameter geometry is built into the cannula structure during manufacturing, creating a preliminary configuration that proactively prevents obstructions before they can form. The tapering design guides debris flow in advance toward the distal opening, eliminating the need for reactive clearing actions during procedural use
3Ease of operation
If a varying cross-sectional area design is implemented, then obstruction clearance is improved, but manufacturing complexity increases
Solution Approach 1:
The invention applies parameter changes by varying the inner diameter along the length of the cannula. This continuous or stepped change in the diameter parameter creates the obstruction-preventing geometry while remaining compatible with standard manufacturing processes such as tube drawing or extrusion, where diameter variations can be achieved through controlled deformation or multi-stage forming
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
This design reduces the likelihood of obstructions occurring in hard-to-reach areas, allowing for efficient suction application and reducing procedural time by enabling easy access and clearance of debris, thus enhancing the operational efficiency of suction instruments in anatomical passageways.
Implementation Method 1
potentially incorporating a tapered interior surface to prevent clogs through turbulent flow
Data Source
AI summary
A suction instrument includes a grip portion and a cannula. The grip portion includes a suction port and defines a first lumen. The cannula extends distally from the grip portion. The cannula defines a second lumen in fluid communication with the first lumen of the grip portion. The cannula includes a proximal portion and a distal portion. The proximal portion of the cannula defines a first portion of the second lumen. The first portion of the second lumen has a first cross-sectional area. The distal portion terminates into an open distal end. The distal portion of the cannula defines a second portion of the second lumen. The second portion of the second lumen has a second cross-sectional area. The second cross-sectional area is smaller than the first cross-sectional area.