Reusable Injector Housing for Controlled Injection Depth
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Solution Overview
Problem
Existing injection devices require dexterity for proper injection depth and are not easily reusable, posing challenges in ease of use and sustainability.
Innovation Solution
A reusable housing device with a top and bottom body configuration, allowing for controlled injection depth through movable parts and releasable attachment, featuring a needle cover and plunger rod mechanism for ergonomic handling and visual/tactile feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional injection device is used, then the device structure is simple, but the ease of operation deteriorates due to difficulty in grasping and controlling injection depth
Solution Approach 1:
The housing device is divided into a bottom body and a top body that can be detachably connected. The bottom body receives the injection device and provides structural support, while the top body contains the plunger rod and provides ergonomic handling. This segmentation allows each part to be optimized independently for its specific function while improving overall ease of operation.
Solution Approach 2:
The housing device acts as an intermediary between the user and the injection device. It provides a user-friendly interface through the top body with recesses for finger placement, while the bottom body interfaces with the injection device components. This intermediary structure mediates the interaction, making injection depth control easier without complicating the core injection mechanism.
2Loss of substance
If a reusable housing device is implemented, then sustainability is improved, but device complexity increases due to multiple components and assembly requirements
Solution Approach 1:
The device is segmented into reusable components (bottom body, top body, needle cover) that can be detached and reused, versus disposable components (injection device with needle and medical container). This allows the complex housing structure to be reused multiple times, reducing waste while accepting the complexity of multiple components as a trade-off for sustainability.
Solution Approach 2:
The design implements a mixed strategy where the housing device (bottom body and top body) is recovered and reused, while the injection device components are discarded after single use. This selective recovery approach reduces overall waste and improves sustainability, justifying the increased device complexity through environmental benefits.
3Measurement precision
If blocking features are added to control injection depth, then measurement precision is improved, but device complexity increases due to additional blocking mechanisms
Solution Approach 1:
The blocking features are pre-configured in the housing device to automatically engage at specific injection depths. The radially deformable legs and radial stops are positioned in advance to provide tactile feedback and physical blocking at the predetermined injection depth, eliminating the need for complex real-time control mechanisms during the injection process.
Solution Approach 2:
The blocking features provide tactile feedback to the user through the top body when the injection needle reaches the predetermined depth. The radially deformable legs engage with the injection device casing, creating a noticeable resistance or click that signals proper injection depth has been achieved, improving measurement precision through sensory feedback.
Data Source
AI summary
This housing device includes a bottom body extending a longitudinal axis A, the bottom body being configured for receiving an injection device having an injection needle, a casing, a medical container arranged within the casing, and a needle guard axially movable with respect to the casing. The housing device also includes a top body, axially movable with respect to the bottom body between an initial position and an injection end position distally located with respect to the initial position, the top body including a proximal end and a plunger rod configured for pushing a stopper of the injection device in order to expel a medical product contained within the medical container; releasable attachment features for allowing releasable attachment and detachment of the top body and the bottom body; and a needle cover, axially movable with respect to the bottom body between an initial position and a retracted position proximally located with respect to the initial position.