Syringe Tip Tapered Flow Path Reduces Viscous Material Adhesion

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Solution Overview

Problem

Conventional compules and syringe tips face issues with viscous materials adhering to the nozzle tip and outer wall, leading to inefficient application and low usage efficiency due to deformation and dripping during discharge.

Innovation Solution

A compule or syringe tip with a discharge structure featuring a flow path around a virtual central line and a tapered flow path between the flow path and the discharge opening, where the cross-sectional area gradually increases toward the discharge opening, reducing deformation and adhesion of viscous material.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a conventional discharge opening is used, then the viscous material can be discharged, but the material adheres to the annular tip surface and outer wall portion, causing deformation and dripping

Engineering Contradiction:

Improvedischarge shape precisionVSAvoidadhesion to unintended portions

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The discharge opening is divided into an inner circular discharge opening and an outer tapered flow path with a reduced diameter portion. This segmentation allows the viscous material to flow through distinct zones, with the reduced diameter portion acting as a constraint to prevent adhesion to the outer wall, thereby resolving the contradiction between achieving precise discharge shape and preventing harmful adhesion.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of enlarging the discharge opening to improve flow, the invention reduces the diameter of a specific portion of the flow path (the reduced diameter portion) to prevent adhesion. This inverted approach—using reduction rather than enlargement—solves the problem by creating a narrowing effect that controls material flow and prevents contact with the outer wall surface.

Inventive Principle:

Principle #13The other way round (Inversion)

2Productivity

If the discharge opening diameter is increased to improve flow, then discharge efficiency improves, but more material adheres to the outer wall portion

Engineering Contradiction:

Improvedischarge efficiencyVSAvoidmaterial adhesion loss

Core Design Contradiction:

ProductivityVSLoss of substance

Solution Approach 1:

The flow path structure varies locally: the discharge opening has a larger diameter for efficient flow, while a specific portion (the reduced diameter portion) has a smaller diameter to prevent adhesion. This local variation in dimensions allows the system to simultaneously achieve high discharge efficiency through the larger opening and minimize material loss by preventing contact with the outer wall through the narrowed section.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The reduced diameter portion acts as an intermediary element between the discharge opening and the outer wall portion. It mediates the flow of viscous material, guiding it through a constrained path that prevents direct contact with the outer wall, thereby reducing adhesion loss while maintaining discharge efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Manufacturing precision

If the discharge opening is enlarged to reduce deformation, then shape accuracy improves, but material adheres to the annular tip surface

Engineering Contradiction:

Improvedischarge shape accuracyVSAvoidadhesion to tip surface

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The discharge structure is segmented into multiple zones: a discharge opening for shape formation, a reduced diameter portion to prevent adhesion, and an outer wall portion. This segmentation allows the discharge opening to be optimized for shape accuracy while the reduced diameter portion independently handles the adhesion prevention function.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Rather than simply enlarging the discharge opening to improve shape accuracy, the invention uses a reduced diameter portion within the flow path to control material behavior. This inverted approach prevents adhesion to the tip surface by creating a narrowing that guides the material away from the outer wall, while the discharge opening maintains optimal dimensions for shape accuracy.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS20240252280A1Compule and syringe tip having discharge nozzle diameter widened at tip

Publication Date: 2024.08.01 SHOFU INC

AI summary

To provide a compule or syringe tip that can discharge viscous material in an intended shape by reducing deformation of the viscous material during discharge, can prevent viscous material from adhering to unintended portion by reducing an amount of viscous material that adheres to a nozzle tip, and can reduce dripping of viscous material to improve the anti-dripping property of the viscous material.To provide a compule or syringe tip having a discharge structure for discharging viscous material from a discharge opening, wherein the discharge structure comprises a flow path that is formed around a virtual central line and allows the viscous material to move, and a tapered flow path formed between the flow path and the discharge opening, wherein a cross-sectional area of the tapered flow path gradually increases toward the discharge opening.