Hypodermic Needle Destruction via Joule Heating and Compression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The safe and cost-effective disposal of used hypodermic needles is challenging due to the risk of needle stick injuries and the complexity and expense of handling hazardous medical waste, with existing methods either requiring complex equipment or leaving the needle in a state that can still cause injury.
Innovation Solution
A method and apparatus that preheats a containment cylinder and applies an axial compressive force to a used hypodermic needle, using electrodes to vaporize liquids and soften the needle, allowing it to be compressed into a compact, non-sharp mass for safe disposal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire syringe assembly is disposed of in a sharps bin, then needle stick injuries are prevented, but disposal costs and complexity increase significantly
Solution Approach 1:
The invention separates the needle from the syringe assembly, allowing the needle to be destroyed in a dedicated device while the syringe can be processed separately or reused. This segmentation enables targeted destruction of the hazardous component without requiring disposal of the entire assembly in complex sharps bin systems.
Solution Approach 2:
The invention replaces the mechanical containment system (sharps bins) with a thermal destruction system. Instead of mechanically containing and transporting hazardous needles in specialized bins, the system uses controlled heating to vaporize and destroy the needle material, eliminating the need for complex sharps bin infrastructure.
2Ease of manufacture
If high electrical current is applied to incinerate the needle, then the needle is destroyed, but complex equipment is required and residue disposal remains a problem
Solution Approach 1:
The invention changes the destruction mechanism from high-current electrical incineration to controlled thermal heating. By adjusting temperature and time parameters rather than using extreme electrical currents, the system achieves effective needle destruction with simpler equipment that doesn't require specialized high-power electrical infrastructure.
Solution Approach 2:
The invention extracts and vaporizes the liquid contents and organic materials from the needle through controlled heating, separating these components from the metal needle structure. This extraction approach eliminates the residue disposal problem by completely vaporizing organic contaminants rather than leaving ash or slag that requires further handling.
3Ease of operation
If only the needle tip is bent, then the needle appears deactivated, but it remains sharp and requires continued treatment as hazardous waste
Solution Approach 1:
The invention applies thermal energy to change the physical state of the needle material, transitioning it from solid metal to vapor phase. This parameter change completely eliminates the sharp hazard rather than merely deforming the tip, ensuring reliable neutralization that eliminates the need for continued hazardous waste classification.
Solution Approach 2:
The invention utilizes phase transition of the needle material from solid to vapor through controlled heating. This complete phase change ensures total destruction of the hazardous sharp object, unlike tip-bending methods that only alter shape while maintaining the fundamental sharp hazard that requires ongoing special waste handling.
4Reliability
If large numbers of sharps bins are supplied and incinerated, then hazardous waste is managed, but considerable expense is incurred and environmental pollution increases
Solution Approach 1:
The invention enables on-site destruction of needles at the point of use, eliminating the need for collection, transport, and centralized incineration of sharps bins. The system serves itself by destroying waste immediately where it is generated, avoiding the energy and costs associated with the entire waste management supply chain including bin manufacturing, distribution, collection, and incineration.
Solution Approach 2:
The invention replaces the mechanical waste management system (sharps bins requiring collection and incineration) with a thermal destruction system. This substitution eliminates the need for physical bin infrastructure and the associated manufacturing, distribution, and disposal cycles, significantly reducing energy consumption and environmental impact while maintaining reliable hazardous waste management.
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
This approach effectively reduces the risk of needle stick injuries and simplifies the disposal process by transforming the needle into a safe, compact form that can be handled as regular clinical waste, minimizing environmental impact and disposal costs.
Implementation Method 1
pre-heating a containment cylinder (118) in a housing (112) with a heater (300) surrounding the containment cylinder to vaporize the liquids prior to application of an axial compressive force to the needle (2)
Implementation Method 2
the used hypodermic needle is contacted at a sharp end with a second electrode (20) that provides a first current to flow in the used hypodermic needle (2) to vaporize liquids contained within or on the surface of the needle, and providing a subsequent second current whereby the second current causes the needle (2) to soften
Implementation Method 3
providing an axial compressive force to the needle (2) along an axis of the needle
Data Source
AI summary
Disclosed is an apparatus for processing a hypodermic needle, comprising: a containment cylinder (17) for receiving the needle; a first electrode (16) for contacting the needle near a first end; a second electrode (20) for contacting the needle at its sharp end; a control system, operable to cause a current to flow in the needle between said first and second electrodes, whereby said current causes the needle to soften and wherein the second electrode is arranged to move within the containment cylinder and to provide a compressive force to the needle, wherein the containment cylinder is arranged to be heated by a heater in the form of a heater coil (not shown) surrounding the containment cylinder during the processing.