Explore the principles and applications of minimally invasive surgical techniques, including laparoscopy and robotic-assisted surgery, focusing on the benefits, challenges, and advancements in this field.
Minimally Invasive Surgery (MIS) – Study Notes
1. Definition
- Minimally Invasive Surgery (MIS): A set of surgical techniques that achieve the same therapeutic goals as open surgery but use smaller incisions, specialized instruments, and visualisation technologies to reduce tissue trauma.
2. Historical Milestones
| Year |
Milestone |
Significance |
| 1901 |
First endoscopic examination of the abdominal cavity (Kelling) |
Pioneered “laparoscopy” concept |
| 1985 |
First laparoscopic cholecystectomy (Mouret) |
Demonstrated feasibility of complex intra‑abdominal MIS |
| 1990s |
Introduction of video‑assisted thoracoscopic surgery (VATS) |
Expanded MIS to thoracic procedures |
| 2000s |
Development of robotic platforms (e.g., da Vinci) |
Enhanced dexterity, 3‑D vision, tremor filtration |
| 2010s |
Single‑port and natural orifice transluminal endoscopic surgery (NOTES) |
Pushed the limits of incision‑free approaches |
3. Core Principles
- Small Access Ports – Typically 5–12 mm incisions; sometimes a single port or natural orifice.
- Enhanced Visualisation – High‑definition, often 3‑D, video imaging (laparoscope, thoracoscope, endoscope).
- Specialised Instruments – Long, slender, articulated tools; energy devices (ultrasonic, bipolar) for cutting/coagulation.
- Tissue‑Preserving Technique – Minimal disruption of surrounding structures, reduced blood loss.
- Goal‑Oriented – Same oncologic, functional, or reconstructive outcomes as open surgery.
4. Common MIS Modalities
| Modality |
Typical Access |
Primary Uses |
Key Equipment |
| Laparoscopy |
3–5 abdominal ports (5–12 mm) |
Gallbladder, appendectomy, hernia repair, colorectal, gynecologic, bariatric surgery |
30°/0° laparoscope, insufflator, trocars |
| Thoracoscopy (VATS) |
2–4 thoracic ports (5–12 mm) |
Lung lobectomy, pleural biopsy, esophageal mobilization |
Rigid thoracoscope, double‑lung ventilation |
| Robotic Surgery |
3–4 robotic arms + camera port |
Prostatectomy, hysterectomy, cardiac valve repair, complex colorectal |
Surgeon console, robotic arms, EndoWrist instruments |
| Endoscopic Submucosal Dissection (ESD) |
Natural lumen (GI tract) |
Early GI cancers, large polyps |
Endoscope with electrosurgical knife |
| Single‑Port / Laparo‑endoscopic Single‑Site (LESS) |
One incision (often umbilical) |
Cholecystectomy, nephrectomy, gynecologic procedures |
Flexible/curved instruments, multi‑channel port |
| Natural Orifice Translumenal Endoscopic Surgery (NOTES) |
No skin incisions; access via mouth, vagina, rectum |
Transgastric appendectomy, peritoneoscopy |
Flexible endoscope, specialized suturing devices |
5. Advantages Over Open Surgery
| Category |
Benefits |
| Patient‑Centric |
Smaller scars, less postoperative pain, reduced opioid use, quicker return to daily activities |
| Clinical |
Lower blood loss, decreased infection rates, shorter hospital stay, reduced pulmonary complications |
| Economic |
Shorter LOS → lower |