Hypodermic Needle Destruction via Joule Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for disposing of used hypodermic needles are unsafe and costly, as they can lead to needlestick injuries and require specialized handling, and existing solutions often result in non-reproducible or partially sharp needle fragments, complicating safe disposal and increasing environmental pollution.
Innovation Solution
An apparatus that clamps a syringe assembly and applies a controlled electrical current to soften and compress the needle into a compact, non-sharp mass, using a containment cylinder to ensure consistent and safe processing, which can be cooled and removed for disposal as regular waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If used hypodermic needles are disposed of in sharps bins, then safety from needlestick injuries is improved, but disposal cost and complexity increase significantly
Solution Approach 1:
The invention extracts the harmful sharp needle component from the syringe assembly by selectively removing and destroying only the needle, while leaving the syringe body intact for separate disposal. This separates the hazardous element from the non-hazardous container, allowing simplified disposal of the syringe without requiring specialized sharps bin handling.
Solution Approach 2:
The invention changes the physical state and geometry of the needle through controlled deformation and melting processes. The needle is first deformed to remove its sharp characteristics, then melted to complete destruction, transforming it from a hazardous sharp object to a safe molten mass that can be disposed of with regular waste.
2Reliability
If high electrical current is used to incinerate the needle, then needle destruction is achieved, but equipment complexity increases and residue disposal remains problematic
Solution Approach 1:
The invention replaces complex mechanical incineration equipment with a simpler electrical current delivery system. Instead of using furnaces or incinerators, the patent uses controlled electrical current passed through the needle to generate heat directly in the needle material, achieving destruction through Joule heating rather than external combustion.
Solution Approach 2:
The invention introduces a water-cooled anvil as an intermediary component that serves multiple functions: it provides a cooling surface to quench the molten needle metal, acts as a heat sink to absorb excess thermal energy, and provides structural support during the destruction process. This intermediary enables controlled cooling and solidification without requiring complex residue handling systems.
3Object-affected harmful factors
If only the needle tip is bent, then some sharpness is reduced, but the needle remains potentially injurious and requires continued special handling
Solution Approach 1:
The invention applies partial action by first deforming only the critical tip region of the needle to remove its sharp characteristics, then applying excessive action by melting the entire needle to ensure complete destruction. This two-stage approach first addresses the immediate hazard (sharp tip) then ensures total elimination of the hazard through complete melting.
4Reliability
If compressive force is applied to melt the needle, then needle destruction is achieved, but buckling occurs leading to non-reproducible results and bent sharp needles
Solution Approach 1:
The invention replaces mechanical compression with electrical heating as the primary destruction mechanism. By passing electrical current through the needle, heat is generated directly within the needle material through Joule heating, causing uniform melting without the mechanical buckling and deformation problems associated with compressive forces. This substitution of thermal energy for mechanical force achieves reliable and reproducible destruction.
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 apparatus effectively reduces the risk of needlestick injuries and environmental hazards by transforming used needles into a safe, compact form that can be disposed of without specialized handling, lowering disposal costs and improving handling safety.
Implementation Method 1
A voltage is applied across the length of the needle... causing a current to flow through the needle, heating and thus, softening it
Implementation Method 2
The coalesced needle can then be cooled and disposed of
Data Source
Figure 1~2b
Figure 3a~3e
Figure 4
AI summary
Disclosed is an apparatus for processing a hypodermic needle (2), comprising: means for softening the needle; and means (120) for providing a compressive force to the needle.