Injection Training Damper Unit with Nested Piston
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Solution Overview
Problem
Current automatic injection training devices lack accurate simulation of resistance during medicament injection and are not easily reusable, necessitating improved designs for frequent and realistic training.
Innovation Solution
The training device incorporates a damper unit with a piston assembly and actuation assembly, featuring a first energy accumulating member, such as a helical spring, to simulate the resistance of a regular injection device, allowing for realistic damping and easy reloading, with a reload unit facilitating the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a training device uses a simple discharge mechanism without damping, then the device structure is simpler, but the simulation accuracy of injection resistance is insufficient
Solution Approach 1:
The damper unit is nested within the housing assembly, with the piston assembly contained within the damper housing. This nested configuration allows the damping mechanism to be integrated into the existing device structure without significantly increasing overall complexity, while still providing accurate simulation of injection resistance through the fluid-filled piston system
Solution Approach 2:
The damper unit utilizes a fluid (hydraulic or pneumatic) contained within the piston assembly to create resistance during the discharge mechanism's movement. The fluid's incompressibility and viscosity provide a realistic simulation of the resistance encountered during actual medicament injection, thereby improving simulation accuracy without requiring complex mechanical spring systems
2Productivity
If a training device uses a non-reloadable design, then the device structure is simpler, but the productivity and frequency of use are limited
Solution Approach 1:
The device is segmented into distinct functional modules: a reusable housing assembly containing the discharge mechanism and damper unit, and a replaceable cartridge containing the medicament reservoir and needle. This segmentation allows the cartridge to be quickly exchanged between uses while the expensive housing assembly remains in place, thereby increasing productivity without significantly increasing overall device complexity
Solution Approach 2:
The cartridge is designed as a disposable component that is discarded after use, while the housing assembly is recovered and reused. This approach allows frequent replacement of consumable parts (cartridges) without requiring complex reloading mechanisms in the permanent housing, thus improving productivity while maintaining reasonable device complexity
3Reliability
If a training device uses a complex reset procedure, then the reliability of the discharge mechanism is improved, but the ease of operation deteriorates
Solution Approach 1:
The complex reset and reloading procedures are extracted from the main housing assembly and transferred to the disposable cartridge. The cartridge is pre-assembled and pre-loaded with the medicament reservoir and needle in a controlled manufacturing environment, ensuring reliability without requiring complex user operations. The user simply replaces the entire cartridge rather than performing complex reset procedures, thereby improving ease of operation while maintaining discharge mechanism reliability
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 device provides a realistic simulation of medicament injection with adjustable resistance, enabling frequent use and easy reloading, enhancing training accuracy and convenience.
Implementation Method 1
a first energy accumulating member, in particular a first helical spring, which is operationally associated with the damper housing such that, due to an output axial force from the first energy accumulating member, the damper housing is moveable in relation to the piston assembly and in relation to the outer housing
Implementation Method 2
the damper housing and the piston assembly are configured such that the damper housing slides in a proximal direction relative to the piston assembly during injection simulation
Data Source
Figure 1~2
Figure 3
Figure 4~5C
AI summary
Automatic injection training device with a housing assembly comprising an outer housing, an actuation assembly, and a damper unit comprising a damper housing and a piston assembly that is arranged in said damper housing. The damper housing slides in a proximal direction relative to the piston assembly when an injection is simulated.