Cannula Delivery Tip With Internal Bristle Bundles
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Solution Overview
Problem
Existing brush tips for dispensing flowable materials in medical and dental applications face challenges such as a meticulous mounting process, potential shedding, and clogging, which affect the secure binding and flow of materials.
Innovation Solution
A delivery tip with internally bundled bristles secured by a restriction member within a cannula, allowing for secure attachment and effective distribution of flowable materials without hindering fluid discharge, featuring a cannula with varying cross-sections and a restriction member with a smaller cross-sectional area for secure bundling and flow facilitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If external flocked spreading means are mounted on the syringe surface, then material distribution is achieved, but the mounting process becomes meticulous and shedding occurs
Solution Approach 1:
The patent inverts the conventional approach by moving the bristles from the external surface to the internal surface of the cannula. Instead of mounting flocked means on the outside, the delivery tip now has bristles that are internally positioned and bound by a restriction member within the cannula, reversing the location and mounting approach to eliminate shedding issues
Solution Approach 2:
The restriction member is nested within the cannula, and the bristles are nested within the restriction member. This nested structure allows the bristles to be securely held inside the cannula without external mounting, creating a compact integrated assembly that eliminates shedding while maintaining material distribution capability
2Reliability
If external fibrous spreading means are securely bound, then shedding is reduced, but clogging occurs
Solution Approach 1:
The restriction member provides localized secure binding of the bristles at specific internal locations within the cannula, while the rest of the bristle bundle remains free to distribute material. This localized quality approach ensures shedding prevention at the binding point without causing overall clogging, as the bristles maintain their distribution function in the material flow path
Solution Approach 2:
The restriction member acts as an intermediary between the bristles and the cannula wall. It provides the necessary binding force to prevent shedding while maintaining a configuration that allows material flow through and around the bristles, preventing clogging by mediating the interaction between the fibrous bundle and the flowable material
3Reliability
If bristles are bundled internally with a restriction member, then shedding is reduced, but the cross-sectional geometry must be carefully matched
Solution Approach 1:
The restriction member utilizes an asymmetric cross-sectional geometry where one dimension (first dimension) matches the cannula interior for secure engagement, while the other dimension (second dimension) is smaller to allow material flow. This asymmetric design provides secure bundling without requiring perfect geometric matching in all dimensions, simplifying the overall design while maintaining reliability
Data Source
AI summary
A delivery tip for flowable materials with bristles or fibers extending therefrom. The tip is a cannula with a tapered outlet and features a bristle or fiber bundle with a binding restriction member that interfaces with the cannula at some point within the cannula but has a smaller cross-sectional area for flow passage than the cannula at that point. The bristle or fiber bundle extends out of the tapered outlet. The delivery tip may connect to a material reservoir with flowable material. When positive pressure is applied to the reservoir, material then will flow through the cannula, around the restriction member, into the bristles or fibers and out the outlet for distribution to a desired surface.