Clinical Reference

Application sites and leech numbers are derived from published clinical protocols and international practice guidelines. Exact placement should be determined by the treating practitioner based on individual patient anatomy and clinical presentation. Surgical application sites are within the FDA 510(k)-cleared indication; other sites represent off-label use.

Surgical Applications (FDA-Cleared)

Digit Replantation

Site: Directly on the replanted digit, area of maximum congestion
Leeches: 1-2 per application
Frequency: Every 2-4 hours
Duration: Until venous drainage reestablished (2-7 days)
Note: Small leeches (3-5 cm) for digits; syringe guide for precision

Free Flap / Pedicle Flap

Site: Center and margins of flap, areas of darkest discoloration
Leeches: 2-4 per application
Frequency: Every 2-8 hours depending on congestion severity
Note: Distribute leeches across the flap surface. Avoid suture lines if possible.

Ear / Nose Replantation

Site: Posterior ear surface, helical rim, or nasal tip
Leeches: 1-2 per application
Frequency: Every 2-4 hours
Caution: Prevent leech migration into ear canal or nasal cavity — use application window

Breast Reconstruction (DIEP/TRAM)

Site: Flap surface, areas of venous congestion
Leeches: 2-3 per application
Frequency: Every 4-8 hours
Note: Monitor cumulative blood loss closely (multi-day therapy common)

Musculoskeletal Applications (Off-Label)

Knee Osteoarthritis

Site: Periarticular — medial and lateral joint lines, suprapatellar
Leeches: 4-6 (range 4-8)
Frequency: Single treatment session
Evidence: Michalsen RCT (Ann Intern Med, 2003), Andereya RCT (2006)

Lateral Epicondylitis

Site: Over lateral epicondyle, point of maximum tenderness
Leeches: 2-4
Frequency: Single treatment session
Evidence: Bäcker RCT (Charité, 2011, n=68)

Thumb CMC-1 Osteoarthritis

Site: Over first carpometacarpal joint
Leeches: 2-3
Frequency: Single treatment session
Evidence: Michalsen additional RCT

Chronic Low Back Pain

Site: Paravertebral at level of maximal tenderness, trigger points
Leeches: 4-7
Frequency: Single treatment session

Neurological Applications (Off-Label)

Stroke / Cerebrovascular

Site: Paravertebral C1-C2, mastoid processes, occipital area
Leeches: 5-8 per session
Frequency: 1-3 times/week for 2-3 weeks
Evidence level: International clinical experience (Level IV)

Spinal Radiculopathy

Site: Nerve root exits, interspinous ligaments, trigger points
Leeches: 7-9 per session
Frequency: 8-12 sessions (daily or every other day)
Evidence: Konyrtaeva n=280 (89% symptom improvement)

Vascular Applications (Off-Label)

Superficial Thrombophlebitis

Site: Over the thrombosed vein segment, proximal and distal to thrombus
Leeches: 3-6
Frequency: 2-3 sessions, every 2-3 days

Chronic Venous Insufficiency

Site: Along affected vein course, ankle region, areas of maximal edema
Leeches: 4-8
Frequency: Multiple sessions as clinically indicated

Application Safety Notes

Critical Precautions by Region

Head/neck: Risk of leech migration into mouth, nose, or ear canal — use application windows (transparent membrane with cutouts)
Periorbital: Use smallest leeches (3-5 cm); syringe guide method for precision; prevent migration toward conjunctiva
Digits: Syringe guide method preferred for precision on small surfaces
All sites: Cleanse with warm water only — no alcohol, betadine, or fragranced products. Mark sites before application. Never leave patient unattended.

Body Map