Cannula Delivery Tip With Internally Bundled Bristles
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Solution Overview
Problem
Existing brush tips for dispensing materials in medical and dental fields face challenges such as a meticulous mounting process, potential shedding, and clogging due to secure binding, which balance acceptable shedding and flow.
Innovation Solution
A delivery tip with internally bundled bristles secured by an elliptical disk within a cannula, where the disk's minor axis is smaller than the cannula's minor axis, allowing secure bundling and unimpeded fluidic distribution, with attachment means for containment structures like syringes or reservoirs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bristles are securely bound with a disk inside the cannula, then shedding is reduced, but the risk of clogging increases
Solution Approach 1:
The cannula is divided into multiple sections: a wider proximal section for inserting the binding disk and bristle bundle, and a narrower distal tip section for material discharge. This segmentation allows the disk to be securely positioned without blocking the bristle bundle, preventing clogging while maintaining holding strength.
Solution Approach 2:
The cannula has different cross-sectional dimensions at different locations. The proximal section has a larger cross-section to accommodate the binding disk, while the distal tip has a smaller cross-section optimized for material flow. This local variation in geometry resolves the contradiction between secure binding and preventing clogging.
2Reliability
If the binding disk has the same cross-section as the cannula, then the bristles are securely held, but material flow is blocked
Solution Approach 1:
The cannula is segmented into a proximal section with larger cross-section for disk insertion and a distal tip with smaller cross-section for material discharge. This allows the disk to be held securely without blocking the flow path.
Solution Approach 2:
The cannula exhibits local quality variation with different cross-sectional areas at different positions. The proximal section accommodates the binding disk while the distal tip maintains optimal dimensions for material flow, resolving the contradiction between holding strength and flow rate.
3Manufacturing precision
If the cannula tip is narrowed for precise material delivery, then dispensing precision is improved, but the binding disk may block the flow
Solution Approach 1:
The cannula is segmented into a proximal section for disk insertion and a distal tip for precise delivery. This segmentation allows the binding disk to be positioned in the wider proximal section, preventing blockage, while the narrowed distal tip maintains dispensing precision.
Solution Approach 2:
The cannula has different cross-sectional dimensions at different locations: the proximal section is wider to accommodate the binding disk without blockage, while the distal tip is narrowed for precise material delivery. This local quality variation resolves the contradiction between preventing flow blockage and achieving dispensing precision.
Data Source
AI summary
A delivery tip for flowable materials with bristles extending therefrom. The tip is a cannula with a tapered outlet and features a bristle bundle with a binding disk that interfaces with the cannula at some point within the cannula but has a smaller cross-section than the cannula at that point. The bristle bundle then extends out of the tapered outlet. The delivery tip is connected to a material reservoir with flowable material. When positive pressure is applied to the reservoir, material then will flow through the cannula, around the disk, into the bristles and out the outlet for distribution to a desired surface.