Injection Locking Structure for Syringe Reuse Prevention
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Solution Overview
Problem
Existing syringe reuse prevention technologies fail to completely prevent reuse due to exposed needle coupling portions and plunger pressurization, leading to potential secondary infections and disease spread.
Innovation Solution
A disposable injection device with a locking structure that includes a locking module and an elastic spring, allowing the module to be raised and locked to the outer housing after use, and a separation guide mechanism to draw the syringe needle inside the housing, preventing further use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separable body is combined with a fixed body by a screw and covered by a reuse prevention cover, then the connection breakable portion can be broken to separate the bodies and prevent reuse, but the syringe needle coupling portion remains exposed and the plunger can still be pressed, failing to completely prevent reuse
Solution Approach 1:
The device is divided into distinct functional modules: an outer housing containing the needle coupling portion, a locking module that can be raised to lock the plunger, and a reuse prevention cover with breakable connections. This segmentation allows each module to perform its specific function independently, achieving complete reuse prevention through the locking mechanism while maintaining structural clarity.
Solution Approach 2:
The elastic spring is pre-compressed between the locking module and the outer housing before use. When the reuse prevention cover is broken and the locking module is raised, the spring automatically expands to lock the plunger in place, preventing further pressing without requiring additional manual intervention or complex locking mechanisms.
2Reliability
If the locking module is raised and locked to the outer housing using an elastic spring, then the pressed liquid cartridge is prevented from being pressed further and reuse is prevented, but the separation of the locking module from the outer housing may be difficult
Solution Approach 1:
The connection between the locking module and outer housing transitions from a static locked state to a dynamic separable state. The elastic spring maintains a pre-compressed state that provides locking force during use, but allows the locking module to be raised and separated after use by overcoming this spring force, enabling both secure locking and easy separation.
Solution Approach 2:
The elastic spring is pre-compressed between the locking module and the outer housing before use. This preliminary compression stores potential energy that automatically locks the plunger when the locking module is raised, while also providing a controlled resistance that guides the separation process without causing difficulty.
3Ease of operation
If the syringe needle coupling portion is exposed to the outside, then the syringe can be used for injection, but the exposed needle coupling portion allows the syringe to be reused after use
Solution Approach 1:
The needle coupling portion is extracted from the locking module and placed within the outer housing. After use, when the locking module is raised and locked, the needle coupling portion remains contained within the housing, physically preventing further access and reuse while maintaining injection functionality during the intended single use.
Solution Approach 2:
The needle coupling portion is nested within the outer housing, which acts as a protective container. After injection, the locking mechanism ensures the nested structure remains closed, preventing exposure of the needle coupling portion and eliminating infection risks from reuse while allowing normal injection operation.
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
Effectively prevents reuse by ensuring the syringe needle is drawn into the housing and locked, thereby preventing further injection and reducing the risk of infections.
Implementation Method 1
an elastic spring located in a compressed state at a lower end of the locking module in the outer housing
Implementation Method 2
when a locking module accommodating a liquid cartridge in which the injection of an injection solution is completed is additionally pressed, when the pressing force is removed, the pressed locking module is raised and lowered due to a restoring force of an elastic spring
Data Source
AI summary
A disposable injection device according to an embodiment has a locking structure to prevent reuse in which, in a state where a locking module accommodating a liquid cartridge in which the injection of an injection solution is completed is additionally pressed, when the pressing force is removed, the pressed locking module is raised and lowered due to a restoring force of an elastic spring located in a compressed state at a lower end of the locking module and locked to an outer housing, and thus the locking module is prevented from being further pressed, and smoothly separates the locking module from the outer housing through a separation guide portion having a tapered shape and formed on an upper end of the outer housing through a pressure head constituting an upper portion of a pressurizing piston unit in a state where in the injection of the injection solution is completed.