Class 4 Laser Therapy

Class 4 Laser Therapy

What’s Class 4 Laser Therapy

Class 4 laser therapy is an advanced form of phototherapy that uses high-powered lasers to penetrate deep into tissues. It promotes healing and reduces pain. Unlike lower-powered lasers, Class 4 lasers operate at power levels exceeding 500 milliwatts (mW). Accordingly, this allows for more significant therapeutic effects. These lasers emit specific wavelengths of light absorbed by cellular components, leading to increased cellular activity, enhanced blood flow, and reduced inflammation. Besides, medical and veterinary fields widely use this therapy to treat chronic pain, soft tissue injuries, and musculoskeletal disorders. Its efficacy and minimal side effects make it a preferred choice for many healthcare providers.

Comparison with Low Level Laser Therapy (LLLT)

Both Class 4 laser therapy and Low Level Laser Therapy (LLLT) use light to stimulate cellular function. However, they differ significantly in power levels and applications. LLLT, also known as cold laser therapy, operates at power levels below 500 mW and primarily targets superficial tissues. It is effective for minor injuries and conditions requiring light penetration. Class 4 laser therapy’s higher power allows it to penetrate deeper tissues, making it suitable for treating more severe and chronic conditions. Additionally, Class 4 lasers provide faster treatment times due to their higher energy output. LLLT may require more sessions to achieve similar results.

Advantages of Class 4 Laser Therapy

Class 4 laser therapy offers several advantages over other forms of phototherapy and traditional treatment methods:

Faster Treatment Times: High power allows Class 4 laser therapy to deliver therapeutic doses of light in a shorter time, reducing each session’s duration.

Deeper Tissue Penetration: The increased power allows the laser to penetrate deeper into tissues, effectively treating conditions that involve deeper structures like muscles and joints.

Enhanced Pain Relief: Class 4 lasers stimulate endorphin production and reduce nerve sensitivity, providing significant pain relief for chronic and acute conditions.

Accelerated Healing: The therapy promotes cellular regeneration and increases blood flow, speeding up the healing process of injured tissues.

Versatility: Class 4 lasers can be used for a wide range of conditions, making them a versatile tool in both human and veterinary medicine.

Class 4 Laser Therapy Devices

Class 4 laser therapy devices are available in various models, each designed to meet specific clinical needs. These devices typically feature adjustable power settings, multiple wavelengths, and interchangeable applicators to tailor treatments to individual patients. Key features of these devices include:

High Power Output: Ranging from 0.5 to 10 watts or more, enabling deep tissue penetration.

Wavelength Variability: Devices often offer multiple wavelengths, such as 810 nm, 980 nm, and 1064 nm, each targeting different tissue depths and types.

Portability: Many modern Class 4 laser devices are portable, allowing for use in various clinical settings, including outpatient clinics and mobile practices.

User-Friendly Interface: Advanced devices come with touchscreen interfaces and pre-set treatment protocols, simplifying operation for healthcare providers.

Applications for Human and Veterinary Use

Class 4 laser therapy is versatile and effective for a wide range of applications in both human and veterinary medicine.

Human Use

Musculoskeletal Disorders: Treats conditions like arthritis, tendonitis, and muscle strains by reducing inflammation and promoting tissue repair.

Chronic Pain Management: Provides relief for chronic back pain, neuropathy, and fibromyalgia through deep tissue penetration and endorphin release.

Wound Healing: Enhances the healing of surgical wounds, ulcers, and burns by stimulating cellular activity and improving blood flow.

Veterinary Use

Animal Injuries: Effective for treating soft tissue injuries, fractures, and post-surgical recovery in animals.

Chronic Conditions: Helps manage chronic conditions like hip dysplasia, arthritis, and degenerative joint diseases in pets.

Performance Enhancement: Used in sports medicine for animals to improve performance and accelerate recovery in working and athletic animals.


Class 4 laser therapy represents a significant advancement in phototherapy. It offers deep tissue penetration, enhanced pain relief, and accelerated healing. Its broad range of applications in both human and veterinary medicine, combined with its efficiency and safety, make it a valuable tool for modern healthcare. Understanding the distinctions from LLLT and leveraging the benefits of advanced Class 4 laser devices allow practitioners to provide superior care and achieve better patient outcomes.


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