Autoinjector Gas-Driven Mixing for Difficult Dual-Cartridge Drugs

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Solution Overview

Problem

Existing dual container injector/autoinjectors require manual mixing and multiple user steps, leading to delays, inadequate mixing, and user dissatisfaction, especially for difficult-to-mix drugs that need high-intensity and long-duration mixing.

Innovation Solution

A mixing and drug delivery system with a housing containing two medicament containers, a fluid communication assembly, a pressurized gas chamber, mixing activation mechanism, and a needle delivery assembly, which automates the mixing and delivery process using solenoid valves and a power source to control the transfer and mixing of medicament components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If manual mixing is used in dual container injectors, then device complexity is reduced, but mixing effectiveness and treatment speed deteriorate

Engineering Contradiction:

Improvedevice complexityVSAvoidtreatment speed

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The system performs mixing automatically without requiring user intervention. The control system activates the mixing mechanism, monitors the mixing process, and transitions to delivery phase automatically, making the system self-sufficient and eliminating manual mixing steps

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces manual mechanical mixing with an automated mixing mechanism controlled by a control system. The mixing assembly is actuated automatically through fluid communication pathways and control mechanisms, substituting human-operated mechanical actions with automated system control

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Device complexity

If multiple user steps are required for mixing and delivery, then ease of operation deteriorates, but device complexity remains manageable

Engineering Contradiction:

Improvedevice complexityVSAvoidease of operation

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

The patent combines multiple functions (mixing, delivery, and control) into a single integrated system. The mixing assembly and delivery mechanism are merged into one device with unified control, eliminating the need for separate operations and reducing the number of user steps required

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The system prepares the medicament for delivery in advance by automatically completing the mixing process before the delivery phase. The control system initiates mixing, monitors completion, and prepositions the system for immediate delivery, eliminating the need for user intervention between mixing and delivery steps

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If manual mixing is used, then device complexity is reduced, but mixing intensity and homogeneity deteriorate

Engineering Contradiction:

Improvedevice complexityVSAvoidmixing homogeneity

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent replaces manual mixing with an automated mixing mechanism that provides consistent, high-intensity mixing. The control system regulates the mixing assembly to deliver precise mechanical action, ensuring uniform drug-solvent mixing that cannot be achieved through manual shaking

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The control system monitors the mixing process and adjusts the mixing mechanism accordingly. Sensors detect mixing progress and provide feedback to the control system, which modulates the mixing assembly to achieve optimal homogeneity and detect when mixing is complete

Inventive Principle:

Principle #23Feedback

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 system ensures efficient, high-intensity mixing and automated delivery of difficult-to-mix drugs with minimal user intervention, reducing treatment delays and improving user experience.

Implementation Method 1

a pressurized gas chamber at least partially disposed in the housing to pressurize the mixing system

Methodology Applied

Scientific EffectGas pressure: Pressure Increase

Implementation Method 2

controlling a solenoid valve in fluid communication with the pressurized gas chamber

Methodology Applied

Scientific EffectSolenoid actuation: Solenoid

Data Source

PatentUS20260027308A1Automated and semi-automated mixing and automated delivery autoinjector

Publication Date: 2026.01.29 WINDGAP MEDICAL INC

AI summary

An automated, and/or semi-automated, reciprocating medicament mixing and injector system, where the energy provided to transfer medicament components back and forth between containers or cartridges can be redirected to deliver the mixed medicament components. A pressurized gas source can drive the flow through a plurality of valves to mix medicament between containers. In a fully automated embodiment, a user activated button advances a magnet to power solenoid valves to control mixing, and then dispensing the medicament. In a semi-automated embodiment, a user activated button releases pressurized gas, and mixing button routes the gas through alternating valves fluidly coupled to the containers to mix the medicaments.