Magnetic Autoinjector Structure for Concealed Needle Drug Delivery
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Solution Overview
Problem
Existing injectors face challenges such as complex working principles with piston rods and springs, risk of infection with needleless designs, and safety issues due to exposed needles, limiting their ease of use and compactness.
Innovation Solution
A magnetic autoinjector design utilizing stationary and needle magnets with opposite poles to drive the injection process, eliminating the need for a piston rod and spring mechanism, featuring a closed cylindrical body with a transfer channel for drug delivery and locking elements to secure the needle when not in use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a standard long injector with piston rod and spring is used, then the injection function is achieved, but the device complexity increases and the size becomes larger
Solution Approach 1:
The patent replaces the traditional mechanical piston rod and spring mechanism with a magnetic field-based pushing structure. Magnets are positioned inside the fixed holder and inner holder in such a way that the same poles are facing each other, creating repulsive force that pushes the drug solution without mechanical contact, thereby simplifying the device while maintaining injection functionality
Solution Approach 2:
The patent extracts and removes the unnecessary mechanical components (piston rod and spring) from the injection system, keeping only the essential function of pushing the drug solution through magnetic repulsion between strategically positioned magnets
2Object-affected harmful factors
If a needleless jet injector is used, then the safety is improved, but the device complexity increases due to special apparatus
Solution Approach 1:
The patent uses magnetic repulsion force between magnets to propel the drug solution through the needle and into the patient, replacing complex mechanical jet injection apparatus with a simpler magnetic field-based system that achieves needleless injection safety
3Ease of operation
If the needle is fixed outside the injector body, then the injection function is achieved, but the safety decreases due to exposed needle
Solution Approach 1:
The patent nests the needle inside the inner holder, which is itself contained within the injector body. The needle is pushed through the patient's skin by magnetic force, then automatically retracts back into the inner holder, keeping it concealed and safe when not in use
4Reliability
If a spring mechanism is used for piston movement, then the injection function is achieved, but the device size increases
Solution Approach 1:
The patent replaces the space-consuming spring mechanism with a compact magnetic field-based pushing structure. Magnets positioned within the existing holder spaces create repulsive force to move the drug solution, eliminating the need for large spring components and reducing overall device size
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 automatic, safe, and compact drug injection without exposed needles, ensuring a seamless and efficient delivery of a certain dose intradermally, subcutaneously, or intramuscularly.
Implementation Method 1
with the same poles facing each other in order to ensure that they apply a repulsive force
Implementation Method 2
with the opposite poles facing each other and with liquid medication between them, in order to ensure that they apply a pulling force to each other
Data Source
Figure 1
AI summary
The invention requires first aid and emergency intervention to oneself or others; It is about the magnetic autoinjector, which is used in cases where intradermal, subcutaneous or intramuscular injection is needed in the living body and provides a safe and easy use.