How Ultrasonic Cleaning Works for Industry and Labs

By Rachel Kohn |

Ultrasonic cleaning has become an indispensable tool for industries requiring the highest standards of cleanliness, particularly in the production of machined metal parts for critical applications in pharmaceuticals, laboratories, and manufacturing. The ability to remove contaminants from intricate surfaces with unparalleled precision and efficiency makes ultrasonic cleaning a cornerstone of quality control. This article delves into the core principles of how does ultrasonic cleaning work and its specific applications for machined metal components.

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Achieving Commercial-Grade Cleanliness with Cavitation

The effectiveness of ultrasonic cleaning lies in cavitation, a powerful yet controlled process:

• High-Frequency Sound Waves: Ultrasonic cleaners generate sound waves, typically in the range of 20 to 400 kHz, using transducers bonded to the cleaning tank.
• Microscopic Bubble Formation: As these waves propagate through a cleaning solution, they create alternating pressure zones. During low-pressure phases, microscopic vacuum bubbles form.
• Powerful Bubble Implosion: When these bubbles encounter high-pressure zones, they implode with significant energy release.
• Precision Contaminant Removal: The energy from these implosions creates localized, intense micro-jets that dislodge contaminants from the surfaces of immersed parts, reaching even the most intricate geometries.

Applications in Industrial and Laboratory Settings

• Machined Metal Parts: Removing machining oils, metal chips, and particulates from precision parts.
• Pharmaceutical Manufacturing: Cleaning equipment and components to meet stringent cleanliness standards.
• Laboratory Equipment: Decontaminating and cleaning sensitive lab instruments and components.
• Industrial Maintenance: Cleaning and restoring machinery parts and tools.
• Aerospace Industry: Cleaning critical components that require precision.
• Medical Device Manufacturing: Cleaning parts for medical devices.

The Ultrasonic Cleaning Process

1. Solution Selection: The cleaning solution is critical. It must be compatible with the metal and effective against the contaminants (e.g., machining oils, metal chips, particulates).
2. Part Immersion: Machined metal parts are carefully placed in the ultrasonic cleaner tank, ensuring complete submersion.
3. Ultrasonic Wave Generation: The generator activates the transducers, creating the high-frequency waves.
4. Cavitation and Cleaning: Cavitation bubbles form and implode, dislodging contaminants from all surfaces.
5. Cycle Duration: The cleaning cycle is tailored to the level of contamination and part complexity.
6. Rinsing and Drying: Parts are rinsed with clean water or a specific rinsing solution to remove residue, followed by thorough drying.

Key Factors for Effective Ultrasonic Cleaning

• Frequency Optimization: Lower frequencies are ideal for removing heavy contaminants like machining oils and chips, while higher frequencies are used for finer cleaning of delicate parts.
• Chemical Compatibility: The cleaning solution must be compatible with the metal and effective against specific contaminants.
• Temperature Control: Elevated temperatures enhance cleaning efficiency by reducing surface tension and increasing cavitation intensity.
• Power Management: Adequate power ensures effective cavitation throughout the tank.
• Precise Timing: Controlled cleaning cycles prevent over-cleaning or damage.
• Tank Design: Tank size and transducer placement optimize cleaning for specific part geometries.

Benefits of Ultrasonic Cleaning

• Superior Cleanliness: Reaches intricate surfaces and removes contaminants that manual cleaning cannot.
• Reduced Damage Risk: Provides gentle yet effective cleaning, minimizing damage to delicate parts.
• Increased Efficiency: Significantly reduces cleaning time and labor compared to manual methods.
• Consistent Quality: Ensures repeatable and reliable cleaning results, crucial for quality control.
• Improved Process Control: Enables precise control over cleaning parameters, ensuring optimal results.

Contact Tovatech for Questions on How Ultrasonic Cleaning Works

Understanding how ultrasonic cleaning works reveals its critical role in achieving high-precision cleaning for machined metal parts and other critical components in industrial and laboratory settings. By leveraging the power of cavitation, businesses can ensure optimal cleanliness, improve efficiency, and maintain the highest standards of quality. For expert guidance on selecting the right ultrasonic cleaning equipment and solutions for your industrial or laboratory needs, call or chat with the experts at Tovatech.

About Rachel Kohn

So how did an MIT Ph.D. end up selling refrigerators? When I figured out that a lot more scientists buy lab refrigerators than innovative leading-edge instruments. I hope that my many years of lab experience will help you find the right equipment for your work. Before co-founding Tovatech I worked in business development and project management at Smiths Detection, Photon-X, Cardinal Health, and Hoechst Celanese. And before that I spent 12 years as an R&D chemist at Hoechst Celanese and Aventis working on advanced drug delivery systems, polymer films and membranes, optical disks, and polysaccharides. Some day, eventually, I’ll make enough money to develop an innovative technology that will change the world. Read Rachel's Complete Bio

Sizing Up Your Ultrasonic Needs for Device Processing

Ultrasonic cleaning systems provide an automated solution for delicate or highly intricate medical devices.

To perform ultrasonic cleaning, an ultrasonic washer uses a cleaning solution, cavitation, and flushing action to thoroughly clean complex surgical instruments. Common devices processed in ultrasonic cleaners include Minimally Invasive Surgical (MIS) instruments, ophthalmic instruments, and laparoscopic devices such as robotic surgical instruments.

Want to Learn More about How Ultrasonic Washers Work?

View our Guide to Ultrasonic Cleaning

Ensuring you have the right ultrasonic washer to support your facility's device inventory and throughput needs is important. Many high-growth procedures, such as orthopedic and ophthalmic require more complex instruments. Facilities, including Acute Care and Ambulatory Surgery Centers (ASCs), should evaluate their current needs and capabilities with plans to support future reprocessing needs.

How many Medical Devices will you be Reprocessing

It may seem obvious, but beyond the types of instruments, it is important also to consider the volume of devices requiring sonic cleaning.

• How many devices do you need to process using ultrasonic cleaning per day to keep your Sterile Processing Department (SPD) running at high efficiency?
• How long does a typical cycle take per the medical devices' Instructions For Use (IFUs)?
• Based on your answers to these questions: what ultrasonic throughput is needed to support your reprocessing needs?
• Also, consider: Do you need a dedicated ultrasonic for eye instruments?

To ensure maximum throughput and staff productivity, your ultrasonic washer must be able to process the maximum number of devices in a minimum number of cycles to meet the needs of a growing caseload. You will need to consider what your volume looks like in the near term, perhaps over the next 3-5 years. With minimally invasive surgical procedures rapidly growing, SPDs will rely on ultrasonic cleaning to process more medical devices that may require a faster turnaround.

Many ultrasonics can process a variety of devices, including orthopedics, eye instruments, or robotics. Always check the manufacturer's load capacity recommendations and device IFUs for sizing and compatibility. The chart below compares device type and capacity capabilities.

Innowave™
Ultra & Ultra+

Innowave™
Unity

Innowave™
PCF

Innowave™
Pro

Tabletop ultrasonic irrigator

Processes up to 12 lumens or 11 lbs. of instruments per cycle

RedCrown Product Page

Large freestanding ultrasonic cleaner

Processes up to 16 lumened devices, or up to 35 lbs. per cycle*

Smaller footprint ultrasonic washer

Processes 20 lumened instruments, or up to 44 lbs. in every cycle

Maximum capacity ultrasonic washer

Processes 60 lumened instruments, or up to 66 lbs. in every cycle

— — Meets all robotic instrument IFU requirements with the automated wash, flush, and rinse cycles Meets all robotic instrument IFU requirements with the automated wash, flush, and rinse cycles *Unity 15 = 25 lbs. per cycle / Unity 20 = 35 lbs. per cycle

What Devices are you Reprocessing?

It is important to consider the caseloads and associated sets you will be processing from the Operating Room (OR)

If your facility is experiencing a growing number of orthopedic procedures, a larger sonic to reprocess more devices in a single cycle will help address increasing demand.

Many surgical procedures that are growing in volume use lumened devices, which often are longer and will not fit in a smaller ultrasonic unit.

If you are processing robotic instruments, a sonic that meets all robotic instrument IFU requirements, including the automated wash, flush, and rinse cycles, would be best to optimize your workflow.

Do you need to process eye surgical instruments?

Unlike most instruments processed in an ultrasonic cleaner, eye instruments require a dedicated wash cycle free from enzymatic detergents. Based on this requirement, many facilities will have a dedicated ultrasonic washer strictly used for reprocessing eye instruments.

If you do not have a sonic dedicated additional cleaning and flushing of the entire sonic bay is required. This process helps ensure the removal of all enzymatic substances.

How much space is available for an ultrasonic washer in your department?

With a better understanding of the device types and procedure volume, space becomes the final consideration in choosing the right ultrasonic. Most hospital SPDs require larger, freestanding ultrasonic units based on device inventory and the volume of instruments they are reprocessing.

Regardless of which ultrasonic unit you may need, each unit must have at least 6 inches of clearance on each side for servicing. To aid in your decision, the example below illustrates and compares typical ultrasonic dimensions:

Which ultrasonic is best for you?

The right ultrasonic washer supports the necessary productivity required in your SPD. High-quality cleaning is critical when it comes to efficiency and ensuring compliance. Backlogs in decontamination can often result in delays and sometimes even canceled procedures.

Choosing the right ultrasonic surgical instrument cleaner for your facility today, and with an eye to the future, will enhance your department's throughput and productivity. By answering the questions in this article, you can confidently choose the right ultrasonic washer for your healthcare facility.

If you are looking for more details, kindly visit Medical Ultrasonic Cleaner.