Medical Injector with Separate Autoreconstitution and Dose Setting Triggers

Solution Overview

Problem

Existing medical injectors lack the ability to perform dose setting after autoreconstitution and require separate activations for autoreconstitution and autoplunger drive, which can lead to failure or improper operation if not executed correctly.

Innovation Solution

A medical injector with a body containing mixable components, a displaceable plunger driven by a spring, and separate triggers for autoreconstitution and autoplunger activation, allowing for dose setting after reconstitution and subsequent automated plunger drive.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single activator button is used for both autoreconstitution and autoplunger drive, then device complexity is reduced, but reliability deteriorates due to potential failure or improper operation

Engineering Contradiction:

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The device divides the activation process into two separate triggers: a first trigger that activates autoreconstitution and a second trigger that activates the autoplunger drive. This segmentation allows each function to be independently controlled and verified, improving reliability while maintaining relatively simple device architecture.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If dose setting is not provided after reconstitution, then device complexity is reduced, but adaptability deteriorates due to inability to adjust dose

Engineering Contradiction:

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The device enables dose setting to be performed after reconstitution is complete, allowing the user to adjust the dose based on actual reconstitution results before initiating the plunger drive. This preliminary action ensures accurate dosing while maintaining a relatively simple overall device structure.

Inventive Principle:

Principle #10Preliminary action

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

Enables reliable autoreconstitution and dose administration with separate triggers for each function, reducing the risk of failure and ensuring accurate dose delivery.

Implementation Method 1

a spring disposed to advance the plunger

Methodology Applied

Scientific EffectSpring: Spring

Data Source

PatentUS10034980B2Medical injector with post-autoreconstitution dose setting and autoplunger drive

Publication Date: 2018.07.31

AI summary

A medical injector is provided herein having a body; a reservoir containing first and second mixable components; a stopper; a plunger disposed in the body; a spring disposed to advance the plunger; a first releasable retainer for releasably retaining the plunger in a first state against force of the spring; a first trigger for causing the first releasable retainer to release the plunger; a second releasable retainer for releasably retaining the plunger in a second state against force of the spring; and, a second trigger for causing the second releasable retainer to release the plunger. The spring causes the plunger to advance so that the stopper traverses at least a predetermined extent of advancement thereby causing mixing of the first and second mixable components. Advantageously, with the subject invention, a medical injector is provided which allows for autoreconstitution with subsequent dose setting and autoplunger activation being activated by separate triggers.