Safety Syringe Plunger Release Mechanism for De-aeration
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Solution Overview
Problem
Existing safety syringes with complex designs involving limiting arms and notches fail to allow complete de-aeration without an additional operating step, and the connection between the protective cylinder and syringe cylinder is not released at the end of the injection process, preventing full displacement of the plunger.
Innovation Solution
A safety syringe design featuring a syringe cylinder with a plunger rod, a protective cylinder, and a spring mechanism, where the plunger tip's release movement in the distal direction allows the fingers between the cylinders to be released, enabling complete de-aeration and proper needle shielding without additional steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If limiting arms and notches are used to control plunger movement, then the safety mechanism is activated, but the connection between protective cylinder and syringe cylinder is not released, preventing complete de-aeration
Solution Approach 1:
The plunger rod is designed with a release movement capability that is activated in advance when the plunger tip abuts the distal front wall. This preliminary action of the release movement prepares the fingers for subsequent release, allowing complete de-aeration to occur without requiring additional operating steps after safety mechanism activation.
Solution Approach 2:
The fingers are designed as dynamic elements that can change their state from engaged to released. The release movement of the plunger rod dynamically actuates the fingers to move from their initial engaged position to a released position, enabling the connection between protective cylinder and syringe cylinder to be released automatically during the injection process.
2Reliability
If the connection between protective cylinder and syringe cylinder is maintained, then safety is ensured, but additional operating steps are required for de-aeration
Solution Approach 1:
The syringe is designed to perform the release function automatically through the self-contained release movement mechanism. When the plunger tip abuts the distal front wall, the release movement is automatically triggered, which in turn releases the fingers without requiring any additional manual operating steps from the user. The system serves itself by using the injection force to activate the release mechanism.
3Stability of the object's composition
If fingers securely join protective cylinder and syringe cylinder, then stability is maintained, but release mechanism adds complexity
Solution Approach 1:
The release movement of the plunger rod serves multiple functions: it enables complete de-aeration by releasing the fingers, and it simultaneously activates the safety mechanism. This multi-functionality reduces the need for separate complex release mechanisms while maintaining stable cylinder connection during normal 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
Enables complete de-aeration of the syringe before drawing injection liquid and ensures the needle is safely shielded after use, simplifying the operation and preventing accidental needle exposure.
Implementation Method 1
a spring means located between protective cylinder and syringe cylinder, which forces the two cylinders apart
Data Source
AI summary
Syringe assemblies are described with at least two co-axially positioned cylinders that move relative to one another by action of a spring. Aspects of the syringe assemblies include a protective unit in which a first cylinder of a first length is attached to a second cylinder of shorter second length. In different embodiments, a protective unit is formed of a single or singularly fabricated cylinder. The different protective units may be used with a syringe in which action of a plunger to push a plunger tip into contact with a distal wall of the syringe cylinder to discharge fluid located inside the syringe but does not immediately release the protective unit relative to the syringe cylinder to shield a needle.