Two-Stage Medical Waste Grinder with Spring-Loaded Cutters

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Solution Overview

Problem

Current methods for disposing of medical waste, particularly sharps waste, require specialized containers and incineration, making traditional landfill disposal unsafe and costly, and existing point-of-use solutions are complex and expensive.

Innovation Solution

A two-stage grinder apparatus that reduces medical waste and its containers to a particle size suitable for safe unregulated disposal, using spring-loaded cutter stacks and a drive system powered by a low-horsepower motor, with stainless steel construction and lubrication to ensure effective sterilization and size reduction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If medical waste is disposed of through incineration in specialized facilities, then safety and proper disposal are ensured, but disposal costs increase and the process becomes complex

Engineering Contradiction:

Improvesafety of medical waste disposalVSAvoidcomplexity of disposal process

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces the thermal incineration process with a mechanical grinding system. The grinder uses rotating cutters with teeth to mechanically reduce medical waste into small particles, substituting the complex thermal processing system with a simpler mechanical size-reduction system that achieves safe disposal through physical fragmentation rather than combustion

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention changes the disposal parameter from thermal destruction (incineration) to mechanical size reduction (grinding). By transforming waste into small particles through mechanical action, the system achieves safe disposal without requiring high-temperature incineration facilities, thereby simplifying the disposal process while maintaining safety

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a two-stage grinding system is used to reduce waste to small particles, then disposal safety is improved, but device complexity increases

Engineering Contradiction:

Improvesafety of waste disposalVSAvoidcomplexity of grinder structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The grinding system is divided into two stages: a primary grinding stage with large cutters that perform initial size reduction, and a secondary grinding stage with smaller cutters that perform final particle size reduction. This segmentation allows each stage to be optimized for its specific function while working together to achieve the overall goal of safe waste disposal through progressive size reduction

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If spring-loaded cutter stacks are used to handle various medical waste, then adaptability is improved, but device complexity increases

Engineering Contradiction:

Improveability to handle various medical wasteVSAvoidcomplexity of cutter mechanism

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The cutter stacks are designed to be spring-loaded, allowing them to dynamically adjust to different types and volumes of medical waste. The springs enable the cutters to flex and adapt during operation, providing versatility in handling various waste materials while maintaining a relatively simple overall device structure through the use of elastic elements rather than complex control mechanisms

Inventive Principle:

Principle #15Dynamics

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 safe and efficient disposal of medical waste in traditional landfills by rendering sharps waste and containers unrecognizable, reducing disposal costs and simplifying the process for point-of-use applications without requiring skilled operators.

Implementation Method 1

The first stage includes spring loaded cutter stacks mounted on two adjacent shafts between two edge plates

Methodology Applied

Scientific EffectSpring: Spring

Implementation Method 2

each cutter turning opposite a fixed counter knife enabling a pinching action against the teeth of the cutter

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Implementation Method 3

the drive system is operably coupled to the first and second stages so as to drive each of the first and second stages

Methodology Applied

Scientific EffectElectromagnetic Induction: Electromagnetic Induction

Data Source

PatentUS10843201B2Two stage grinder particularly suitable for medical waste disposal

Publication Date: 2020.11.24 SPECTRUM MEDICAL LENDING LLC

AI summary

Featured are a two-stage grinder, an apparatus embodying same and methods related thereto. Such a medical waste grinder includes a first stage and a second stage. The first stage includes spring loaded cutter stacks mounted on two adjacent shafts between two edge plates, each of the cutter stacks including cutters arranged in a helix to create space, each cutter including a number of teeth per blade and including a major diameter and a minor diameter, each cutter turning opposite a fixed counter knife enabling a pinching action against the teeth of the cutter. The second stage includes spring loaded cutter stacks.