Magnetic Driver Auto Injector Actuation Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional injection devices are cumbersome, expensive, and prone to mechanical failures due to the use of springs, requiring frequent replacement and recalibration, and lack the ability to easily swap medications or needles, making them inefficient and costly for medical applications, especially in emergency situations.
Innovation Solution
A magnetic driver-based injection device with a hollow guide shell, actuator magnet, and driver magnet that allows for quick and adjustable injection force, enabling easy cartridge swapping and recocking, and compatibility with various medication types and needle sizes, without the need for electricity or compressed air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If springs are used to provide injection force, then the device can deliver fluid into the desired object, but the springs wear over time causing injection force and depth to gradually change, requiring frequent replacement and recalibration
Solution Approach 1:
The patent replaces the mechanical spring system with a magnetic field-based actuation system. A driver magnet and actuator magnet interact to provide injection force without physical contact or wear. The magnetic field generates the necessary force to push the plunger and deliver fluid, eliminating the degradation issues associated with repeated mechanical compression and decompression of springs.
2Ease of operation
If a locking device is used to retain the spring in a cocked state, then the device can be prepared for injection, but the user must overcome the large amount of potential energy and force stored in the spring to disengage the locking mechanism, which is cumbersome
Solution Approach 1:
The patent replaces the spring-based energy storage and release mechanism with a magnetic field-based system. The driver magnet and actuator magnet interact to provide the necessary force for actuation without requiring the user to overcome large stored potential energy. The magnetic interaction allows for easier and more controlled actuation.
3Productivity
If conventional syringes are used for injection, then the device can deliver fluid, but a substantial amount of time lapses between initial insertion and completion of injection, allowing the patient to move or jerk suddenly
Solution Approach 1:
The patent implements a pre-loaded magnetic actuation system where the driver magnet is positioned to immediately engage the actuator magnet upon activation. This preliminary positioning of the magnetic field allows for instantaneous force application, eliminating the time delay associated with manual syringe operation and ensuring rapid fluid delivery before patient movement can occur.
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 magnetic driver system reduces the actuation force required for injection, allows for rapid and reliable fluid delivery, and enables the device to be reused with different medications and needles, enhancing efficiency and reducing costs by eliminating the need for frequent device replacement.
Implementation Method 1
The driver magnet selectively exerts an injection force on the actuator magnet to engage the injection pin with the cartridge
Data Source
AI summary
A device has a hollow guide shell including an injection end and a longitudinal axis. An actuator magnet is disposed in the hollow guide shell. An injection pin is coupled to the actuator magnet. A driver magnet is positioned on the device radially outward from the actuator magnet. A fluid cartridge is disposed in the injection end of the hollow guide shell, the fluid cartridge including a needle and a plunger. The driver magnet selectively exerts an injection force on the actuator magnet in a direction oriented towards the injection end of the hollow guide shell to engage the injection pin with the fluid cartridge. A liquid, gas or other agent can selectively be ejected from the cartridge by the device to inject the fluid, gas or other agent into another object.