This video demonstrate Extracorporeal Knot for Continuous Structure by Dr R K Mishra at World Laparoscopy Hospital. It is an extracorporeal knot which has a very good tissue approximation and can be used in surgery like myomectomy.
In laparoscopic surgery, when dealing with continuous structures or tissues under tension, Extracorporeal Knotting is an essential skill. Unlike intracorporeal knots tied inside the body with needle holders, extracorporeal knots are tied outside the patient's body and slid into place using a knot pusher.
Dr. R.K. Mishra at World Laparoscopy Hospital emphasizes that while intracorporeal suturing is elegant, the extracorporeal technique is often safer and more efficient for "continuous structures" like the base of the appendix, the cystic duct, or when performing a high-tension closure of the vaginal vault.
The Mechanics of the Extracorporeal Knot
The primary advantage of this technique is the ability to use the surgeon's hands directly to create the knot, allowing for higher tension and a more secure "first throw."
1. The Setup
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Suture Length: A longer suture (usually 75–90 cm) is required because the thread must travel from the tissue, out through the port, to the surgeon's hands, and back again.
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The Instrument: A Knot Pusher (a long, thin rod with a hole or "eye" at the tip) is used to guide the knot down the cannula.
2. The Sliding Knot (The "Mishra" Preference)
Dr. Mishra often demonstrates the Roeder Knot or the Melzer Knot as the preferred sliding extracorporeal knots. These are "pre-tied" loops that allow the surgeon to tighten the loop around a structure without the knot "slipping back."
Step-by-Step Demonstration Technique
| Phase | Action | Key Technical Detail |
| Passage | The needle is passed through the tissue intracorporeally. | Both ends of the suture are then pulled out through the same port. |
| Formation | The knot is tied outside the body. | The surgeon creates a series of hitches (loops) around the "standing" part of the thread. |
| Advancement | The knot pusher is threaded. | One limb of the suture goes through the eye of the pusher; the other is held taut by the assistant. |
| Placement | Sliding the knot. | The pusher "drives" the knot down the port until it cinches the tissue. |
| Locking | The "Security" throw. | A second or third square knot is often pushed down to lock the primary sliding knot in place. |
Application in Continuous Structures
When Dr. Mishra refers to a "continuous structure," he is often discussing tubular anatomy that requires a circumferential seal:
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The Cystic Duct: During a Cholecystectomy, if the duct is too wide for a clip, an extracorporeal sliding knot provides a 360-degree leak-proof seal.
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The Appendiceal Base: When the appendix is highly inflamed, a sliding extracorporeal knot allows the surgeon to apply controlled, firm pressure to the cecal wall.
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Large Vessel Ligation: It provides superior security compared to clips, which can occasionally dislodge.
Why Dr. Mishra Teaches This at WLH
At World Laparoscopy Hospital, students are taught that tactile feedback is the greatest advantage of the extracorporeal knot.
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Tension Control: You can "feel" the tissue's resistance through the long suture limb much better than through a needle holder.
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Speed: For beginners, tying outside the body is significantly faster than struggling with "needle-eye" coordination inside the abdomen.
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Safety in "Tight" Spaces: If there is bleeding and the camera view is partially obscured, an extracorporeal knot can be slid down a "blind" suture line to achieve rapid hemostasis.
Conclusion
The extracorporeal knot is the "safety net" of the laparoscopic surgeon. Whether it is used for the appendix or a complex vascular ligation, the techniques demonstrated by Dr. R.K. Mishra ensure that the surgeon remains in total control of tissue tension.
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