Yantra and Shastra — Surgical Instruments of Sushruta

Sushruta's Surgical Legacy

Sushruta (~6th century BCE) is the world's first systematic surgical text. He describes: - 8 categories of surgical procedure (chedya, bhedya, lekhya, vedhya, eshya, ahrya, visravya, seevya) - 101 yantras (blunt instruments) - 20 shastras (sharp instruments) - Surgical training methodology — cadaver dissection + clay model practice - Pre-operative + post-operative care - Sterilisation by heating

Italian plastic surgeon Aglio (1816) credited Sushruta as the founder of plastic surgery after observing Indian rhinoplasty techniques.

Yantras — 6 Categories

1. Swastika Yantra (24 types) Cross-shaped instruments. Used for grasping/extracting bones, foreign bodies. Modern equivalent: bone-holding forceps, Allis forceps.

Designs include: simha mukha (lion-mouth), vyaghra mukha (tiger-mouth), kakshapa (turtle-shaped).

2. Sandansha Yantra (2 types) Tweezers/forceps. Used for grasping foreign bodies, hair removal. Modern equivalent: dissection forceps, splinter forceps.

Two subtypes: salakshana (with finer points) and nirlakshana (without).

3. Tala Yantra (2 types) Spoon-like instruments. Used for examining ear/nose passages, removing wax, foreign bodies. Modern equivalent: ear curette, nasal speculum.

4. Nadi Yantra (20 types) Tubular/hollow instruments. Used for examining body cavities — rectum, vagina, urethra. Modern equivalent: speculum (Cusco, Sims), proctoscope, catheter.

Sushruta's vaginal speculum descriptions match the structure of modern Cusco speculum remarkably.

5. Shalaka Yantra (28 types) Rod-like probes. Used for probing fistulae, applying medications, exploring deep wounds. Modern equivalent: probe, fistula probe, applicator.

Subtypes by tip: - Sikta — pointed - Mridu — blunt - Pratata — curved - Etc.

6. Upayantra (25 types) Auxiliary instruments. Includes: cotton swabs, ropes, ladders, supports for patient positioning. Modern equivalent: gauze, retractors, head clamps.

Shastras — 20 Sharp Instruments

Classical 20 sharp instruments:

1. **Mandalagra** — ring-shaped cutting blade (for circular incisions, circumcision)
2. **Karapatra** — saw (for bone cutting)
3. **Vriddhipatra** — cutting blade (general use)
4. **Nakhashastra** — nail-shaped (for fine cuts)
5. **Mudrika** — ring blade (small incisions)
6. **Utpalapatra** — lotus-petal shaped (for excisions)
7. **Ardhadhara** — half-edged (one-sided cutter)
8. **Suchi** — needle (for suturing)
9. **Kushapatra** — kusha grass leaf shape (fine fistula exploration)
10. **Atimukha** — kite-beak shape
11. **Sarari mukha** — kingfisher-beak shape
12. **Antarmukha** — internally-curved (for deep cavity work)
13. **Trikurchaka** — three-pronged (for hookworm removal)
14. **Kuthari** — axe-shape (for large excisions)
15. **Vrihimukha** — paddy-grain shape (for incision drainage)
16. **Aravamukha** — saw-tooth (rough cutting)
17. **Vetasapatra** — willow-leaf shape (fine surgery)
18. **Badisha** — fish-hook (for foreign body extraction)
19. **Dantashanku** — tooth-pick (for dental work)
20. **Eshani** — exploration probe with cutting edge

The 6 Qualities of an Ideal Shastra

Sushruta specifies: 1. **Tikshnata** — sharpness 2. **Sukshmata** — fineness of edge 3. **Nirmalata** — cleanliness, polish 4. **Saumya darshana** — pleasant appearance (the patient sees the instrument) 5. **Suvarna** — good handle grip 6. **Apratidanditva** — non-discordant; well-balanced

A senior surgeon checks every instrument against these 6 qualities before procedure.

Sterilisation Methods

Sushruta describes pre-sterilisation methods that modern microbiology would recognise:

• **Heating in flame** before use (thermal sterilisation)
• **Washing with kashaya** of haridra, lodhra, neem (antimicrobial)
• **Storage in clean cloth wrapping** with dried herbal powders (preservation)
• **Drying in sun before storage** (UV sterilisation)

This pre-dates Joseph Lister's antiseptic surgery (1867) by 2500 years.

Surgical Training

Sushruta requires students to practice before operating on humans:

• **Cucumber / gourd** — for chedya (incision) practice
• **Leather bag with water** — for bhedya (cleaving) practice
• **Stretched skin on frame** — for vedhya (puncture) practice
• **Wax-coated cloth** — for seevya (suturing) practice
• **Clay models** — for shalaka (probing) practice
• **Cadaver dissection** — 1 standard cadaver per surgical student

The Sushruta-mandated training is remarkably similar to modern surgical wet labs.

Modern Lessons

Several Sushruta surgical techniques are still in use or being rediscovered:

1. **Rhinoplasty** — Sushruta's flap technique is the historical basis for modern Indian rhinoplasty methods
2. **Cataract surgery** — couching technique was Sushruta's; modern phaco surgery is conceptually distinct but uses similar pre-op assessment
3. **Cleft lip repair** — Sushruta's vurudhha karma is among the earliest descriptions
4. **Bone setting** — sandhana karma (12 fracture reduction techniques) still influences traditional bone setters in rural India

Self-test

• Name the 6 categories of yantra.
• List the 20 shastras (target: by exam time).
• Give the 6 qualities of an ideal shastra.
• Name one yantra and its modern equivalent.
• Describe Sushruta's pre-sterilisation method.