JULLSURG

Cleaning and Sterilization Validation

Disclaimer: This guidance should be used alongside your institution’s official cleaning and decontamination policies.

1. Introduction to Instrument Cleaning

Cleaning is the first and most critical step in reprocessing reusable medical instruments.

• Instruments that are not properly cleaned cannot be effectively sterilized.
• Organic debris (blood, tissue, proteins) can shield microorganisms, allowing them to survive sterilization.
• This creates a serious risk of cross-infection between patients.

Definition:
Cleaning is the removal of visible and invisible contamination using water and detergents, preparing devices for safe handling and further decontamination.

2. General Precautions (Staff Safety)

Healthcare workers handling contaminated instruments must be protected.

Key measures include:

• Use of Personal Protective Equipment (PPE):
• Gloves
• Fluid-resistant gowns
• Face shields / masks
• Training on blood-borne pathogen safety
• Proper disposal of biohazardous waste
• PPE required when exposure risk is reasonably anticipated

3. Manual Cleaning

Overview

• Oldest and most flexible cleaning method
• Suitable for all instrument types, especially delicate ones
• Limitation: variation in effectiveness between workers
• Risk: direct exposure to contamination

Procedure

1. Soaking
• Use lukewarm water or detergent (preferably enzymatic)
• Minimum: ~10 minutes
• Softens dried debris
2. Brushing
• Use medium-soft brush
• Clean:
• Surfaces
• Joints
• Serrations
• Lumens (internal channels)
• Perform underwater to avoid aerosol formation
3. Rinsing
• Use clean water
• Repeat cleaning if debris remains
4. Important Notes
• Use fresh detergent solution for each session
• Follow manufacturer instructions for instruments and detergents

4. Ultrasonic Cleaning

Purpose

Removes microscopic debris not eliminated by manual cleaning.

Mechanism

• Uses cavitation (microscopic bubbles collapsing)
• Dislodges particles from hard-to-reach areas

Key Points

• Follow manufacturer’s recommended cycle time
• Change solution regularly
• Rinse after cleaning (preferably with distilled water)
• Dry instruments before sterilization

5. Automatic Washers

Used in high-volume settings for efficiency and consistency.

Types

6. Washer-Disinfectors

Provide different levels of disinfection:

• Low-level: Eliminates vegetative bacteria
• Intermediate-level: Targets mycobacteria (partial reduction)
• High-level: Significant reduction of resistant organisms

Effectiveness depends on:

• Proper cleaning
• Correct cycle parameters

7. Washer-Sterilizers

• Combine cleaning + steam sterilization
• Suitable for:
• Trays
• Pans
• Not suitable for heat-sensitive items

Quality assurance:

• Use biological indicators to verify sterilization

8. Preparation Before Automatic Washing

• Follow manufacturer instructions
• May include:
• Pre-soaking
• Pre-cleaning
• Incorrect assumptions about machine capability can compromise safety

9. Use of Instrument Cassettes

• Hold instruments during washing and sterilization
• Must allow free flow of water and detergent
• Recommended only with automatic washers
• After cleaning:
• Dry
• Wrap for sterilization

10. Maintenance of Washing Equipment

• Risk: Biofilm formation in moist internal areas
• Can lead to contamination

Prevention

• Regular preventive maintenance
• Periodic disinfection of internal components
• Follow manufacturer guidelines

11. Multi-Step (Tunnel) Washers

Features

• Fully automated system:
• Soaking
• Ultrasonic cleaning
• Washing
• Rinsing
• Drying

Advantages

• High efficiency
• Minimal manual handling
• Consistent results

Limitation

• High cost → suitable only for large facilities

Key Takeaway

Effective sterilization depends on proper cleaning.
Every step—from manual cleaning to automated systems—must be performed correctly to ensure patient safety and infection control.