Axially Aligned Inhaler Stem Block for Upright Aerosol Delivery

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Solution Overview

Problem

Conventional metered dose inhalers are difficult to use for users with small or weak hands, and they suffer from inefficient and inconsistent drug delivery due to particle size and distribution issues, with particles depositing in the oropharyngeal region and on the tongue, leading to reduced efficacy.

Innovation Solution

A stem block for a metered dose inhaler with an axial alignment of the expansion chamber, exit orifice, and outlet, designed for upright use, which enhances atomization efficiency and improves drug delivery by controlling droplet size and distribution, reducing oropharyngeal deposition, and allowing for reusable components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional metered dose inhalers are actuated in upside-down configuration to avoid dip tube, then manufacturing cost is reduced, but ease of operation deteriorates for users with small or weak hands

Engineering Contradiction:

Improvemanufacturing costVSAvoidease of operation

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

The patent inverts the conventional inhaler configuration by orienting the mouthpiece upward and the canister downward, allowing the user to hold and actuate the inhaler in a natural upright position. This inversion resolves the contradiction by maintaining the cost-effective no-dip-tube design while dramatically improving ease of operation for users with weak hands, as the actuation force is applied in a more ergonomic direction

Inventive Principle:

Principle #13The other way round (Inversion)

2Productivity

If conventional metered dose inhalers deliver aerosolized medicine, then drug delivery is achieved, but particle size distribution causes oropharyngeal deposition reducing efficacy

Engineering Contradiction:

Improvedrug deliveryVSAvoidoropharyngeal deposition

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent modifies the local geometry of the aerosol generation and delivery pathways, specifically the chamber shape, exit orifice dimensions, and outlet configuration. These localized geometric modifications control the aerosol flow dynamics and particle size distribution, ensuring that particles remain in the optimal 1-2 μm range for lung deposition while minimizing larger particles that would deposit in the oropharyngeal region

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent optimizes critical parameters including the exit orifice inner diameter (0.25-0.6 mm), outlet inner diameter (3-7 mm), and the axial alignment of components. By precisely controlling these parameters, the aerosol is atomized into the desired particle size range, improving lung delivery efficiency and reducing oropharyngeal deposition

Inventive Principle:

Principle #35Parameter changes

3Productivity

If expansion chamber inner diameter is narrower than stem passage, then atomization efficiency is enhanced, but device complexity increases

Engineering Contradiction:

Improveatomization efficiencyVSAvoiddevice complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent merges the expansion chamber, exit orifice, and outlet into a single axially-aligned integrated structure. This consolidation achieves the desired atomization efficiency through progressive narrowing (from stem passage to expansion chamber to exit orifice) while minimizing device complexity by eliminating separate components and simplifying the overall geometry

Inventive Principle:

Principle #5Merging (Combining)

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

The stem block design improves user-friendliness, enhances drug delivery to the lungs, reduces environmental impact by allowing inhaler reuse, and maintains superior atomization efficiency compared to conventional inhalers.

Implementation Method 1

an expansion chamber fluidly connected to the stem passage to receive an aerosol from the hollow dispensing member

Methodology Applied

Scientific EffectPressure differential: Pressure Gradient

Implementation Method 2

an exit orifice fluidly connected to the expansion chamber for receiving the aerosol from the expansion chamber. The outlet may be conical

Methodology Applied

Scientific EffectFluid flow:

Data Source

PatentUS20260091181A1Inhaler and Stem Block for Inhaler

Publication Date: 2026.04.02 1000739373 ONTARIO LTD

AI summary

An improved stem block for an inhaler that is fired in an upright orientation, providing easier and more reliable delivery of aerosols. The disclosed stem block demonstrates atomization efficiency that is superior to the performance of a conventional metered dose inhaler. The stem block has a passage that connects to a narrower expansion chamber. The expansion chamber connects to an exit orifice that is narrower than the expansion chamber. The exit orifice further connects to a conical outlet for dispensing an aerosol. The passage, the expansion chamber, and the exit orifice are axially aligned.