How to Clean and Sterilize Reusable Medical Instruments

Understanding how to clean and sterilize reusable medical instruments correctly is critical for infection prevention, patient safety, and instrument longevity. In hospitals, ambulatory surgery centers (ASCs), dental clinics, and sterile processing departments, even small mistakes during reprocessing can lead to contamination risks, damaged instruments, or failed sterilization cycles.

Many healthcare professionals focus heavily on the autoclave itself, but the reality is that sterilization success depends on the entire workflow before the sterilizer cycle even begins. Dried blood, poor rinsing, incorrect detergents, wet packs, or skipped inspections can all compromise outcomes.

This guide explains the proper process for cleaning reusable surgical instruments, how sterilization works, and the best practices for different instrument types and materials.

Cleaning vs Disinfection vs Sterilization

Before discussing the workflow, it is important to understand the difference between the three main stages of instrument reprocessing.

One of the most important sterile processing principles is simple:

You cannot sterilize a dirty instrument.

If organic material remains on an instrument, sterilization may fail regardless of the autoclave cycle settings.

Step-by-Step Guide to Cleaning and Sterilizing Reusable Medical Instruments

Step 1: Point-of-Use Cleaning

The reprocessing workflow starts immediately after the procedure. Blood and bioburden begin drying quickly, and once debris hardens onto an instrument, cleaning becomes significantly more difficult.

At the point of use, staff should remove visible debris as soon as possible and keep instruments moist during transport if required by the IFU. Hinged instruments should remain open, and multi-part devices should be disassembled when appropriate.

Why this step matters

Prevents dried bioburden
Improves cleaning effectiveness
Reduces corrosion risk
Supports successful sterilization later in the process

Step 2: Safe Instrument Transport

Reusable medical instruments should be transported safely to the decontamination area using covered trays or closed containers.

Improper transport can damage delicate instruments before cleaning even begins. Fine scissors, microsurgical tools, and sharp devices are especially vulnerable during handling.

Best practices during transport

Step 3: Sorting and Disassembly

Once instruments enter decontamination, they should be sorted carefully according to type, complexity, and cleaning requirements.

Hinged instruments should be opened fully so cleaning solutions can reach hidden surfaces. Lumened devices and multi-part instruments should be disassembled according to manufacturer instructions.

This step is especially important for:

Suction instruments
Cannulas
Box locks and ratchets
Orthopedic sets
Devices with internal channels

How to Clean Reusable Medical Instruments Properly

Cleaning is the foundation of sterile processing. If cleaning is incomplete, sterilization effectiveness is compromised.

Step 4: Manual Cleaning

Manual cleaning remains one of the most important parts of instrument reprocessing, even in facilities with advanced automated equipment.

Healthcare teams should use enzymatic or neutral pH detergents approved by the IFU. Instruments are typically brushed under water to reduce aerosolization and cleaned carefully around serrations, hinges, ratchets, and box locks.

Areas that require extra attention

Common mistake

One of the most common sterile processing mistakes is assuming ultrasonic cleaners replace manual cleaning entirely. Many manufacturers still require manual preparation before automated cleaning cycles.

Step 5: Ultrasonic Cleaning and Mechanical Washing

Mechanical cleaning systems help improve consistency during instrument reprocessing.

Ultrasonic cleaners are particularly effective for removing debris from hinges, serrations, and difficult-to-reach crevices. Washer-disinfectors help standardize cleaning cycles and reduce manual variability across sterile processing departments.

Ultrasonic cleaning is especially useful for:

Needle holders
Hemostats
Rongeurs
Hinged scissors
Lumened devices

One common mistake healthcare facilities make is assuming ultrasonic cleaning replaces manual cleaning entirely. Many manufacturer IFUs still require manual preparation before automated processing.

This section is ideal for linking to your sterile processing equipment collection, especially ultrasonic cleaners, washer-disinfectors, and decontamination supplies.

Step 6: Rinsing and Drying

After cleaning, instruments should be rinsed thoroughly to remove detergent residue. Residual chemicals may damage instruments over time or interfere with sterilization.

Drying is equally important. Moisture trapped inside packaging, hinges, or lumens can lead to wet packs, corrosion, and sterility maintenance issues.

Poor drying can lead to:

Instrument rust
Wet packs
Packaging failure
Increased repair costs

Forced air drying is often recommended for lumened instruments to ensure internal channels are fully dry before sterilization.

Instrument Inspection and Maintenance

Step 7: Inspection and Function Testing

Every reusable surgical instrument should be inspected before packaging and sterilization.

Technicians should examine instruments for retained debris, corrosion, pitting, cracks, dull edges, and alignment problems. Hinged instruments should move smoothly, and cutting instruments should perform properly.

During inspection, check for:

Any instrument that fails inspection should be removed from service immediately.

Step 8: Instrument Lubrication

Certain instruments require lubrication after cleaning to reduce friction and prevent wear.

This is especially important for:

Hemostats
Needle holders
Clamps
Hinged surgical instruments

Only instrument-approved lubricants should be used according to IFU instructions.

Packaging and Sterilization

Step 9: Proper Instrument Packaging

Packaging protects instruments during sterilization and helps maintain sterility during storage.

Instruments should be arranged carefully without overcrowding trays. Hinged devices should remain open and unlocked, while delicate instruments should be protected with tip guards or dedicated organizers.

Packaging mistakes to avoid

Step 10: Sterilizing Reusable Medical Instruments

Steam sterilization is the most common method for reusable medical instruments in healthcare settings.

Before running a sterilizer cycle, facilities should confirm:

Correct cycle parameters
Proper tray arrangement
Instrument compatibility
IFU requirements
Appropriate load weight

Not all devices are steam compatible, especially instruments containing plastics, polymers, or sensitive materials.

Sterile Storage and Handling

Step 11: Maintaining Sterility After Processing

Sterility maintenance continues after the sterilization cycle is complete.

Sterile packs should be stored in clean, dry environments away from moisture and excessive handling. Torn packaging, crushed trays, or wet packs compromise sterility even when sterilization itself was successful.

Proper storage helps prevent:

Recontamination
Moisture damage
Packaging tears
Unnecessary reprocessing

How Different Instrument Types Should Be Processed

Different instruments require slightly different handling techniques.

Facilities should always follow the IFU for specialty devices and complex surgical instruments.

How Instrument Material Affects Reprocessing

Different materials react differently to chemicals, moisture, and heat exposure.

Mixed-material instruments should always be processed according to the most sensitive material component.

Common Sterile Processing Mistakes

Several common errors continue to cause instrument damage and sterilization failures across healthcare facilities.

These include:

Sterilizing instruments with visible debris
Overloading trays
Skipping inspection steps
Improper drying
Using incorrect chemicals
Mixing heavy and delicate instruments

Facilities that standardize workflows and consistently train staff usually experience fewer reprocessing failures and longer instrument lifespans.

Final Thoughts

Understanding how to clean and sterilize reusable medical instruments properly is essential for patient safety, infection prevention, and instrument longevity.

Facilities that follow standardized cleaning, inspection, packaging, and sterilization workflows reduce instrument damage, improve sterilization consistency, and create safer clinical environments.

To support your sterile processing workflow, shop sterile processing supplies, cleaning solutions, autoclaves, and reusable surgical instruments at MFI Medical.

Frequently Asked Questions

1. Can reusable medical instruments be disinfected instead of sterilized?

Critical instruments that contact sterile tissue must be sterilized. Disinfection alone is not sufficient for these devices.

2. Do I need an ultrasonic cleaner?

Ultrasonic cleaning is strongly recommended for hinged, serrated, and lumened instruments because it improves cleaning consistency and removes debris from difficult areas.

3. What is the most important step in instrument sterilization?

Cleaning and inspection are the most important steps because sterilization cannot compensate for retained debris.

4. How do healthcare facilities prevent rust on surgical instruments?

Proper rinsing, complete drying, approved lubricants, and correct storage conditions all help reduce corrosion and instrument damage.

5. Where can I buy sterile processing supplies and reusable surgical instruments?

You can browse sterile processing supplies and equipment, Metrex cleaning products, cleaners and disinfectants, and Sklar surgical instruments.