Injection Device Segmented Movable Element for Stability
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Solution Overview
Problem
Existing automatic injector devices for hypodermic syringes lack ease of operation, structural stability, and control, particularly when manufactured from inexpensive materials like plastics, and do not adequately protect users from needle exposure.
Innovation Solution
The design includes a housing with a movable element that slides between retracted and injection positions, featuring a syringe holder and a needle shield, allowing for secure grip and angled injections, with a spring mechanism for automatic injection and a light source for detecting blood vessel hits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the housing is made from inexpensive materials such as plastics, then manufacturing cost is reduced, but structural stability deteriorates
Solution Approach 1:
The movable element is divided into three distinct portions: a first portion that slides inside the tubular element, a second portion that slides on the outer surface, and a connection portion joining them. This segmentation allows each part to be optimized for its specific function while maintaining overall structural stability despite using plastic materials.
Solution Approach 2:
Different portions of the movable element have different functional requirements. The first portion requires smooth internal sliding surfaces, the second portion requires external sliding contact with the housing, and the connection portion requires structural strength. This local differentiation of properties enables the use of plastic materials while maintaining necessary structural stability in critical areas.
2Ease of operation
If the device is designed for easy operation, then ease of operation is improved, but control during injection deteriorates
Solution Approach 1:
The release mechanism is extracted as a separate, dedicated component that can be independently optimized for ease of activation. This separate mechanism allows the main injection control to remain simple while the release function provides the necessary operational ease through its specialized design.
Solution Approach 2:
The release mechanism transitions from a held, compressed state to an activated state through user input. This dynamic design allows the device to maintain control during storage and transport while providing ease of operation when needed, as the mechanism naturally wants to move from the high-energy compressed state to the released state.
3Ease of manufacture
If the movable element is designed to slide on the outer surface of the housing, then ease of manufacture is improved, but structural stability deteriorates
Solution Approach 1:
The movable element is segmented into portions that slide in different locations: one portion slides inside the tubular element while another portion slides on the outer surface. This segmentation distributes the sliding functions to different areas, allowing the outer surface sliding to be manufactured easily while the internal sliding provides structural support.
Solution Approach 2:
The connection portion merges the first and second portions into a single integrated movable element. This merging ensures that the forces experienced during injection are distributed throughout the entire element, maintaining structural stability even though parts of it slide on the outer surface where manufacturing is easier.
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 structurally stable, easy-to-use, and safe injection system that can be manufactured from plastics, offering improved control and protection against needle exposure, enhancing user safety and operational efficiency.
Implementation Method 1
a spring mechanism for automatic injection
Implementation Method 2
a light source for detecting blood vessel hits
Data Source
AI summary
Disclosed is an injection device for injecting a hypodermic syringe along an injection direction defining an injection axis. The injection device comprises a housing for being positioned at a user's skin, and a movable element movably arranged relative to the housing between a retracted position and an injection position.