Autoinjector Gas Canister Nesting for High Viscosity Delivery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing medical injection technologies struggle to efficiently deliver high volume and high viscosity medicaments, requiring significant user effort and often involving bulky devices that are difficult to manage.
Innovation Solution
The development of an autoinjector system that incorporates a gas canister to provide the necessary injection force, reducing the effort required by the user and allowing for easier handling due to its reduced volume design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a gas canister is used to provide injection force for high volume, high viscosity medicaments, then the user effort required is reduced, but the device volume increases
Solution Approach 1:
The gas canister is disposed within the plunger rod, creating a nested configuration where the gas canister (containing compressed gas) is placed inside the hollow plunger rod structure. This nesting arrangement allows the gas canister to provide the necessary injection force for high volume, high viscosity medicaments while minimizing the overall device volume, as the gas canister occupies space that would otherwise be empty within the plunger rod.
2Volume of moving object
If the gas canister is disposed within the plunger rod, then the device volume is reduced, but the complexity of the plunger rod structure increases
Solution Approach 1:
The gas canister is disposed within the plunger rod, creating a nested configuration where the gas canister (containing compressed gas) is placed inside the hollow plunger rod structure. This nesting arrangement allows the gas canister to provide the necessary injection force for high volume, high viscosity medicaments while minimizing the overall device volume, as the gas canister occupies space that would otherwise be empty within the plunger rod.
3Reliability
If an interlock mechanism is added to prevent accidental firing, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The interlock mechanism prevents the button from being depressed (and thus prevents accidental firing) unless a needle is properly attached to the container. The interlock engages with the needle attachment structure, creating a preliminary protective action that blocks the firing pathway until the correct configuration (needle attached) is achieved. This approach provides reliable accidental firing prevention while adding minimal complexity, as the interlock utilizes the existing needle attachment geometry rather than requiring a completely separate locking mechanism.
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 autoinjector system effectively delivers high volume, high viscosity medicaments with reduced user effort, achieving the desired delivery time while ensuring the device is more manageable and user-friendly.
Implementation Method 1
a gas canister configured to travel with the plunger rod and containing a compressed gas, wherein the gas canister is configured to release the compressed gas to drive the plunger rod to dispense the medicament out of a distal end of the container
Data Source
AI summary
A medicament delivery device includes a housing, a container disposed within the housing and configured to contain medicament, a plunger slidably disposed within the container, a plunger rod configured to push the plunger through the container to dispense the medicament when the container contains medicament, and a gas canister configured to travel with the plunger rod and containing a compressed gas, wherein the gas canister is configured to release the compressed gas to drive the plunger rod to dispense the medicament out of a distal end of the container.