Single-Use Syringe Plunger With Impulse Reduction To Limit Fluid Spray
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing syringes with breakable plunger rods face issues where the breakage of the connection results in a high contact impulse, leading to the spraying of residual fluids, posing a risk of contamination.
Innovation Solution
A syringe design incorporating a breakable connection between the plunger's proximal and distal portions, equipped with an impulse reduction system featuring sloped braking surfaces or elastic elements to mitigate the contact impulse upon breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a breakable connection is provided between the proximal and distal portions of the plunger rod, then the syringe is disabled after use to prevent re-use, but the contact impulse upon breakage causes residual fluids to spray from the tip
Solution Approach 1:
An impulse reduction system is disposed between the proximal and distal portions of the plunger rod to cushion the contact impulse before it can cause fluid spray. This system includes a compressible element that compresses upon breakage, absorbing the impact energy and preventing the harmful fluid spray effect.
2Strength
If the breakable connection is made strong enough to resist breakage during normal use, then structural integrity is maintained, but the breaking force required may be excessively high
Solution Approach 1:
The breakable connection is designed with specific material properties and geometric parameters that allow it to withstand normal use forces while failing at a controlled, reasonable breaking force. The connection strength parameters are optimized to balance durability during operation with ease of breaking after use.
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 impulse reduction system effectively reduces the contact impulse, minimizing fluid spray and preventing contamination, while ensuring easy breakage of the connection under controlled conditions.
Implementation Method 1
The braking surfaces are designed to slidingly engage with each other to create a motion-resistive force between the proximal portion and the distal portion
Implementation Method 2
an elastic element, such as a spring or similar device, disposed within a gap that separates the proximal portion from the distal portion
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A syringe including a plunger rod assembly including a proximal portion (36) a distal portion (34) with a stopper (38) for expelling fluids from the syringe and a breakable connection between the proximal portion and the distal portion is disclosed. An impulse reduction system (50), which may be an elastic element or braking surfaces, reduces the contact impulse imparted by the proximal portion upon the distal portion when the connection between the distal portion and proximal portion breaks is also disclosed.