10/27/2026
A few years ago, I injured my ankle and received ultrasound therapy. It got me curious about how sound waves and other technologies, including light-based therapies, could be used in healthcare.
Here are 5 technologies you might have forgotten about or never knew existed.
1. LED LIGHT THERAPY
LEDs deliver specific wavelengths of light, often red or near-infrared, that can interact with biological processes in our cells. One proposed mechanism is photobiomodulation, which may influence cellular energy signaling and other processes involved in tissue recovery.
Different wavelengths, doses, and devices can produce different effects.
2. LASER THERAPY
Lasers produce a more concentrated beam of light, and come in different classes.
• Class 3B: Commonly used for low-level laser therapy or cold laser. The goal is to influence cellular processes without relying on heat as the primary mechanism.
• Class 4: Higher-power lasers used in some therapeutic applications. They can deliver energy more rapidly and may produce significant heating, depending on the treatment.
• Surgical lasers: Can cut, vaporize, or coagulate tissue.
3. THERAPEUTIC ULTRASOUND
Instead of light, this technology uses high-frequency sound waves to deliver mechanical energy into tissue.
Depending on the application, ultrasound can produce thermal and nonthermal effects. It's been used in rehabilitation for sprains and other musculoskeletal injuries.
It's a great example of something we can't see or hear during treatment, yet can is still beneficial.
4. HIFU: HIGH-INTENSITY FOCUSED ULTRASOUND
Now we're moving from rehabilitation to tissue destruction.
HIFU concentrates sound energy at a specific point inside the body, that generates heat at the target, producing thermal ablation, which destroys selected tissue.
It's used in certain medical procedures, including some treatments for prostate disease and tumors. No surgical incision is needed.
The precision is what makes this technology so interesting.
5. HISTOTRIPSY
And this is where things get really wild.
What if you could use sound to eliminate tissue without heat?
Histotripsy uses focused ultrasound pulses to generate tiny bubbles that rapidly form and collapse. This process, called cavitation, mechanically breaks apart and liquifies the targeted tissue.
It's being used clinically for certain liver tumors, offering a noninvasive way to eliminate targeted tissue.
So, what do these five technologies teach us?
LEDs and low-level lasers can influence biological processes. Therapeutic ultrasound delivers energy into tissue for rehabilitation applications. HIFU uses focused heat to destroy tissue. Histotripsy uses mechanical forces.