Part 2: Surgical Instruments & Techniques (Chapters 7, 8 & 9)
Chapter 7 - Yantra Vidhi Adhyaya (यन्त्र विधि अध्याय)
Surgical Appliances (Blunt Instruments)
"Surgical instruments number one hundred and one in all, of which the hand is the most important" - Sushruta Samhita, Ch. 7
The Hasta (Hand) is considered the primary Yantra. All 101 Yantras are blunt/non-sharp instruments used to hold, retract, extract, examine, or support during surgery. They are classified into 6 groups:
The 6 Types of Yantra (101 Total)
| # | Type | Count | Shape/Description | Modern Equivalent |
|---|
| 1 | Swastika Yantra | 24 | Cross-shaped; modeled on mouths of lion, tiger, fox, jackal etc. | Forceps / Retractors |
| 2 | Sandamsha Yantra | 2 | Tong-shaped; with or without handle | Tongs / Clamps |
| 3 | Tala Yantra | 2 | Like the palate of a fish | Spatula / Palate retractor |
| 4 | Nadi Yantra | 20 | Tubular; open at one or both ends; length varies per body passage | Tubes / Speculums / Syringes / Enemas |
| 5 | Shalaka Yantra | 28 | Earthworm-shaped, snake-hood shaped probes | Bougies / Probes / Cauterizing rods |
| 6 | Upa-Yantra | 25 | Accessory instruments - threads, gauze, bandages | Bandages / Tourniquets |
Total = 101 Yantras
Key Points from Chapter 7
- Material: Primarily iron; other metals used when iron unavailable
- Standard length: 18 Anguli (finger-breadths) for most instruments
- Animal-inspired design: Instruments shaped like mouths of lion (Sinha-mukha), heron (Kanka-mukha), etc. - chosen for specific extraction purposes
- Kanka-mukha (heron-mouthed) is considered the best - can be inserted and removed easily and applicable to all body parts
- Nadi Yantras (tubular) used for - drainage, examination of piles/fistula, sucking blood/pus, irrigation
- Shalaka Yantras (probes) used for - searching pus, directing incisions, transferring foreign bodies
"Any foreign substance which finds a lodgment in the human system and becomes painful is called Shalyam (foreign body); surgical instruments are the means of extracting it."
Chapter 8 - Shastravacharaniya Adhyaya (शस्त्रावचारणीय अध्याय)
Sharp Surgical Instruments
20 Shastra (sharp instruments) are described. Each is linked to one or more of the Ashtavidha Shastra Karma (8 surgical operations).
The 20 Shastra - Complete List
| # | Shastra Name | Modern Equivalent | Primary Surgical Use |
|---|
| 1 | Mandalagra | Circular/round-headed knife | Chedana (incision) + Lekhana (scraping) |
| 2 | Karapatra | Bone saw | Chedana + Lekhana (bone cutting) |
| 3 | Vriddhipatra | Scalpel / dissecting knife | Chedana + Bhedana |
| 4 | Nakha Shastra | Nail parer | Chedana + Bhedana |
| 5 | Mudrika | Finger knife (ring blade) | Chedana + Bhedana |
| 6 | Utpalapatra | Lancet | Chedana + Bhedana |
| 7 | Ardhadhara | Single-edged knife | Chedana + Bhedana |
| 8 | Suchi | Needle (straight, half-curved, fully curved) | Vyadhana (puncture) + Sivana (suturing) |
| 9 | Kusapatra | Bistoury / Paget's knife | Visravana (drainage/secreting) |
| 10 | Atimukha | Hawkbill scissors / lancet | Visravana |
| 11 | Shararimukha | Scissors (pair) | Visravana |
| 12 | Antarmukha | Curved bistoury | Visravana |
| 13 | Trikurchaka | Trocar / brush | Visravana |
| 14 | Kutharika | Axe-shaped knife | Vyadhana (puncturing) |
| 15 | Vrihimukha | Trocar | Vyadhana |
| 16 | Ara | Awl | Vyadhana |
| 17 | Vetasapatra | Narrow-bladed scalpel | Vyadhana |
| 18 | Badisa | Hook | Aharana (extraction of foreign bodies) |
| 19 | Danta Shanku | Tooth scaler / dental pincers | Aharana |
| 20 | Eshani | Sharp probe / probe director | Esana (probing) |
Sharpness Standard (Key Rule from Ch. 8)
A Shastra is fit for use ONLY when it meets 4 conditions:
| Criterion | Meaning |
|---|
| Sunishitam | Blade sharpened such that it can split a single hair in two |
| Susamsthitam | Well-fixed and stable |
| Sugruhitam | Properly held by the surgeon |
| Pramanena | Of appropriate/correct size for the procedure |
Blade Thickness by Procedure
| Operation | Required Blade Edge Thickness |
|---|
| Bhedana (excision) | Size of a lentil (Masura Pramana) |
| Lekhana (scraping) | Half-lentil size |
| Vyadhana (puncturing) | As thin as a hair (Kaishika Pramana) |
| Chedana (incision) | Half the thickness of a hair |
Holding Techniques
- Bhedana instruments (Vriddhipatra etc.) - held between handle and blade
- Lekhana instruments (Mandalagra, Karapatra) - hand slightly raised
- Visravana instruments - held at tip of handle
Anu-Shastra (Accessory/Substitute Instruments)
When primary Shastra are unavailable, Sushruta permitted natural substitutes:
Bamboo skin, crystals, glass shards, Kuruvinda (crystal), leeches, fire, alkali, nails, leaves of Goji/Shephalika/Shakapatra trees, tender sprouts of corn, hair, and fingers
Chapter 9 - Karma Vipaka Adhyaya (Practical Surgical Training)
This chapter is historically remarkable - it describes the world's first documented surgical training curriculum.
Surgical Training on Models (Pratima/Simulators)
Sushruta mandated that students practice each surgical technique on specific practice models before operating on humans:
| Operation | Practice Object |
|---|
| Chedana (incision) | Vegetables like cucumber, watermelon, gourd |
| Bhedana (excision) | Water-filled leather bags, urinary bladders |
| Lekhana (scraping) | Hairy skin of animals, dead animals |
| Vyadhana (puncturing) | Lotus stems, soft fruits |
| Esana (probing) | Bamboo stems, hollow reeds |
| Aharana (extraction) | Seeds from pulpy fruits |
| Sivana (suturing) | Cloth, skin of dead animals |
| Visravana (drainage) | Water-filled bags |
Core Teaching: "Practice Makes Perfect"
"A surgeon who is well-versed in theory but has not practiced with his hands is timid and confused at the time of actual operation - like a coward in battle."
This philosophy - that hands-on simulation training is mandatory before patient contact - is essentially the same principle behind modern surgical simulators, laparoscopic trainers, and cadaveric labs used in medical education today.
Summary: Part 2 at a Glance
Chapter 7 → 101 YANTRA (Blunt Instruments) - 6 categories
Chapter 8 → 20 SHASTRA (Sharp Instruments) - 8 surgical uses
Chapter 9 → Surgical Training on Simulators - 8 practice models
The
Wikisource English translation of these chapters is freely available online. For detailed analysis, see
EasyAyurveda's chapter-by-chapter commentary.
Would you like to go deeper into any specific Shastra, the 8 surgical operations (Ashtavidha Shastra Karma), or move to another Part?