Comprehensive Clinical Guide: From Acute Pain to Functional Recovery

The ITO EU-941 & 921 Combination Therapy system by ITO Co., Ltd. integrates advanced electrotherapy currents with therapeutic ultrasound in a single, versatile rehabilitation platform.

This allows clinicians to select the appropriate current based on:

  • Tissue healing phase
  • Physiological objective
  • Functional goal
  • Patient tolerance

Below is a complete clinical breakdown of all modalities available within the system.

  1. TENS (Transcutaneous Electrical Nerve Stimulation)

Physiological Mechanism

Stimulates A-beta sensory fibers → activates Gate Control mechanism → inhibits nociceptive transmission.

Clinical Use

  • Acute and chronic musculoskeletal pain
  • Post-operative pain
  • Muscle guarding

Parameters

  • 80–120 Hz → Acute pain
  • 2–10 Hz → Chronic pain (endorphin release)
  • Sensory-level intensity

Example: Acute Lumbar Strain

Reduces pain to allow early mobilization and active therapy.

  1. Interferential Current (IFC)

Physiological Mechanism

Medium-frequency currents intersect to produce deep low-frequency stimulation with reduced skin impedance.

Clinical Use

  • Deep joint pain
  • Subacute inflammation
  • Muscle spasm

Parameters

  • 80–100 Hz → Acute pain
  • 1–10 Hz → Chronic pain
  • Strong sensory or mild motor

Example: Shoulder Impingement

Improves pain control in deep rotator cuff structures.

  1. NMES (Neuromuscular Electrical Stimulation)

Physiological Mechanism

Stimulates motor nerves → visible contraction → improved motor unit recruitment.

Clinical Use

  • Post-surgical weakness
  • Muscle inhibition
  • Neuromuscular re-education

Parameters

  • 35–50 Hz
  • 1:3–1:5 duty cycle

Example: Post-ACL Reconstruction

Restores quadriceps activation and knee stability.

  1. Russian Current

Physiological Mechanism

Medium-frequency burst stimulation for high-intensity contraction.

Clinical Use

  • Advanced strengthening
  • Late-stage rehab
  • Performance enhancement

Parameters

  • 2500 Hz carrier
  • 50 Hz burst

Example: Post-Fracture Muscle Atrophy

Accelerates strength recovery after immobilization.

  1. Microcurrent (MENS)

Physiological Mechanism

Subsensory microamp stimulation → increases ATP production → enhances cellular repair.

Clinical Use

  • Tendon injuries
  • Soft tissue healing
  • Inflammatory conditions

Parameters

  • 100–600 µA

Example: Lateral Epicondylitis

Supports fibroblast activity and tendon repair.

  1. HVPC (High-Voltage Pulsed Current)

Physiological Mechanism

Twin-peak monophasic pulses influencing galvanotaxis and edema control.

Clinical Use

  • Edema management
  • Wound healing
  • Chronic ulcers

Parameters

  • 80–120 pps
  • Negative polarity (early phase)
  • Positive polarity (proliferation phase)

Example: Diabetic Foot Ulcer

Enhances granulation tissue and epithelialization.

  1. Therapeutic Ultrasound

Physiological Mechanism

Mechanical sound waves producing:

  • Thermal effect (continuous mode)
  • Non-thermal cellular stimulation (pulsed mode)

Clinical Use

  • Tendinopathies
  • Joint stiffness
  • Scar tissue
  • Ligament injury

Parameters

  • 1 MHz → Deep tissue
  • 3 MHz → Superficial tissue
  • Pulsed → Acute/subacute
  • Continuous → Chronic

Example: Frozen Shoulder

Continuous ultrasound increases capsule extensibility before stretching.

Why Combine Electrotherapy + Ultrasound?

Combination therapy allows:

  • Pain reduction + tissue extensibility
    • Muscle activation + improved circulation
    • Healing stimulation + functional strengthening

Example:
Rotator Cuff Tendinopathy

  • Pulsed ultrasound → tendon healing
  • IFC → pain reduction
  • NMES → prevent supraspinatus inhibition

Result: Faster progression to active strengthening.

Strategic Value for Clinics

The ITO EU-941 & 921 system enables:

✔ multi-phase rehabilitation in one device
✔ Evidence-aligned modality selection
✔ Reduced equipment redundancy
✔ Improved treatment efficiency
✔ Enhanced patient outcomes

Rather than using standalone devices, the EU-941 & 921 provides a structured, physiology-driven rehabilitation platform suitable for:

  • Orthopaedic clinics
  • Sports medicine centres
  • Neurological rehabilitation
  • Hospital physiotherapy departments
  • Wound management units

Conclusion

The ITO EU-941 & 921 Combination Therapy system is not merely a multi-modal machine—it is a clinically adaptable rehabilitation solution. By aligning each current and ultrasound parameter with tissue healing stages and therapeutic objectives, clinicians can deliver targeted, measurable, and efficient treatment across the full spectrum of musculoskeletal and wound care conditions.

It bridges pain management, tissue healing, and performance restoration in one integrated platform.