Surgical Suturing: How to Load and Pass a Needle Driver Safely

The instrument tie is the simplest knot doctors learn, used in surgery and emergency medicine; it involves making two initial wraps around the thread from the wound side, grabbing the tail near the end to prevent binding, then adding subsequent single wraps from the opposite side to lock the knot securely.

This video teaches surgical knot-tying techniques essential for suturing, demonstrating both one-handed and two-handed methods. For one-handed knots, the non-dominant hand serves as a stationary post while the dominant hand throws the suture around it, requiring practice to develop muscle memory. For two-handed knots, hands cross over each other with index fingers and thumbs gripping opposite suture edges, alternating between index finger and thumb throws to create a secure lock. Both techniques require equal suture length on both sides and sufficient tying wiggle room. Mastery requires consistent practice to achieve efficiency in the operating room while maintaining communication with surgical team members.

This video teaches the foundational two-handed surgical knot tying technique, emphasizing that proper technique is more important than the number of throws for knot security; the instructor demonstrates the step-by-step process of creating a secure square knot by crisscrossing the suture, forming a ring with one hand while passing the other end through, then alternating hands to complete the knot, with tips on practicing on everyday objects and developing proficiency in both right and left-handed techniques.

This video teaches surgical knot tying techniques including two-handed square knots (using an L-shaped grip with alternating index and middle finger throws, starting with a surgeon's knot for tension), one-handed knots (using alternating index and middle finger throws while maintaining tension), and deep ties (practiced using a paint can with a magnetic hook to simulate deep tissue suturing). The recommended progression is to start with string, move to thicker #1 silk suture, then practice with common general surgery sizes (3-0, 4-0) and pediatric sizes (5-0, 6-0), progressing from braided sutures (Vicryl, silk) to more difficult monofilament sutures (PDS, Proline).

Hand knot tying is a fundamental surgical skill that offers ergonomic advantages and greater precision than instrument tying, particularly when working at depth; the technique involves creating a reef knot by looping the suture end over the extended index finger, hooking the short end through the loop, and pulling at 180 degrees to ensure each throw sits flat and prevents slippage, with additional throws added for security based on suture material type.

Proper wound closure requires approximating tissue edges precisely to promote optimal healing. The running subcuticular technique creates a purse-string effect that pulls tissue edges together beneath the skin surface. Surgeons take bites at regular intervals (approximately one-third of the previous bite distance) to maintain even tension across the wound. The goal is to achieve adequate approximation without excessive tension that could compromise blood flow or cause dehiscence.

William Halsted's principles remain essential: gentle tissue handling, anatomical dissection, effective hemostasis, blood supply preservation, and minimizing tissue tension. Dead space from tissue removal requires closure or drainage to prevent seromas. Proper wound edge approximation (muscle-to-muscle, fat-to-fat, skin-to-skin) promotes healing by primary intention with minimal scarring. Aseptic technique with sterile fields, gloves, and gowns prevents infection. Tension from excessive tissue removal causes necrosis and dehiscence.

Proper tension management is critical for successful wound healing. Start closure at areas with least tension (typically wound ends) and work toward the center where gaping is greatest. This sequential approach reduces tension progressively, making final approximations more effective. High-tension wounds require specialized techniques like the vertical mattress suture, which grabs distant tissue bites and brings them close together to evert wound edges outward. This eversion ensures proper epidermal-to-epidermal approximation; improper placement causes edges to turn inward, preventing healing and risking dehiscence.

Suturing technique and tissue handling: (1) Gentle tissue handling with fine instruments; (2) Avoid excessive tension on wound edges; (3) Layered closure from deep to superficial layers; (4) Appropriate suture size selection; (5) Avoid aggressive tissue removal. Tension management is crucial for optimal cosmetic outcomes. Suture spacing depends on wound depth and tension. Traditional teaching suggests spacing based on wound depth (e.g., 0.5 cm from edge for 0.5 cm depth), but clinical judgment should guide spacing.

The overriding principle for any closure is tension-free approximation. Tension is the enemy of good healing because it squeezes blood vessels in wound edges, reducing blood flow and causing ischemia. This leads to poor healing, wound breakdown, dehiscence, and higher infection risk. A critical rule is to avoid including subcutaneous fat in main deep closure stitches because fat has poor blood supply and will necrose under tension, creating a breeding ground for bacteria. Surgeons typically close in layers, securing the strong fascial layer first to take tension, then closing the skin more gently above it.

Advanced suturing techniques include: (1) Horizontal mattress suture - enters at 90°, exits opposite side, takes adjacent bite, returns at same depth to same side; (2) Vertical mattress suture - enters at 90°, goes deep to opposite side, returns superficially along same line; (3) Cut through rate - horizontal mattress has the lowest tendency to tear skin; (4) Subcuticular sutures - cosmetically superior with no visible marks, use 3-0 monofilament on cutting needle, all material buried inside; (5) Continuous sutures - take multiple bites in sequence without retieing, held at 1/3-2/3 junction; (6) Aberdeen/Cobbler's knot - closes continuous sutures by creating triangle with fingers and drawing thread through multiple times.

Vertical mattress sutures begin like simple interrupted sutures but include a second pass close to skin edges. Common errors involve making the far bight too close and near bight too far; for facial wounds, the near bight must be extremely small. Creating a small pulley with the needle driver prevents tearing tissue bridges. Knots should approximate edges closely without excessive tightness, providing gentle aversion without level mismatch or tissue wall formation. Horizontal mattress sutures consist of two interrupted sutures closed in a circle, used for head/neck wounds under tension. They cause skin bunching and reduced blood supply, making them suitable for fascia rather than skin. Running subcuticular sutures maximize aversion with oblique needle passes, requiring all entry/exit points at identical depths. This technique suits longer incisions and thyroid surgery. Inverted simple interrupted sutures place knots deeper in wounds using deep-to-superficial-to-deep passes, reducing extrusion risk. These are performed with absorbable sutures rather than permanent materials.

Horizontal and vertical mattress suturing are advanced surgical closure techniques using large needles and heavy monofilament suture, designed for high-tension incisions such as knee closures or fasciotomies; both techniques involve passing the needle near the skin edge, reloading in the opposite direction, and creating two full strands that divide tension evenly across the incision, requiring six knots to prevent knot slippage due to the synthetic monofilament's tendency to migrate.

Vertical mattress suture (Senn/Pack) sutures multiple planes in one operation, provides good edge inversion, used for scalp wounds. Horizontal mattress suture is for high-tension wounds, contraindicated for continuous sutures in obese patients. Buried horizontal mattress suture (three-point) reduces necrosis risk in flaps with poor blood supply. Simple interrupted suture with inverted knot approximates deep planes, closes dead space, uses absorbable material. Continuous simple suture is contraindicated in high-tension areas.

Mattress sutures address challenging wound closure scenarios. The vertical mattress uses 'far-far-near-near' configuration: enter far, travel under skin, exit far, then near-near. This distributes tension across larger tissue areas, preventing inversion and eversion. Ideal for wounds under tension, with swelling, or where skin rolls inward. The horizontal mattress offers faster closure than separate simple sutures, staying close to edges with equal bilateral bites. The figure-of-eight variant eliminates needle turning by taking consecutive simple bites in sequence. The half-buried variant hides sutures by burying one side subcuticularly, useful for hair-bearing areas or flap tips to avoid blood supply interruption.

Before suture removal, verify physician's order and obtain patient consent. Gather supplies including dressing change tray, sterile gloves, sterile drape, gauze, antiseptic, suture removal kit, and steri-strips. Perform hand hygiene and remove old dressings. Assess the wound for infection signs: redness, warmth, tenderness, foul drainage, or unusual odor. Examine the suture line to ensure skin is properly fused and the wound won't open prematurely. If any concerning findings are present, notify the physician before proceeding. Open sterile supplies on the sterile drape field, don sterile gloves following proper technique, and prepare the antiseptic for wound cleaning.

Proper post-operative wound care involves using sterilized instruments for suture removal, where non-absorbable sutures (like ethicon) are typically removed completely while absorbable sutures may remain under the skin without causing issues; wound healing depends on the patient's immune system strength, nutrition, rest, medication adherence, and proper wound care, with complete healing typically taking 6 months to 1 year, and complications like pus, swelling, or prolonged pain may occur due to infections, poor healing conditions, or weight gain affecting the surgical site.

This comprehensive protocol covers the entire suture removal process. Two suture types exist: resorbable (degrade over weeks to months, may remain visible) and non-resorbable (require manual removal). Three techniques are used: simple separated stitches (most common), simple running stitches (continuous thread), and intradermal stitches (aesthetic surgery). Critical safety principles include: always verify prescriptions (J0 = intervention day), perform hand hygiene, obtain consent, and assess wounds for infection signs before removal. The critical error to avoid is cutting sutures near the knot, as the exposed portion accumulates skin bacteria that can contaminate deep tissues. Cut sutures at skin level. For simple sutures: grasp knot strand, lift to visualize trajectory, cut under knot at skin level, pull gently. For running sutures: isolate each point by cutting connecting strands. For intradermal sutures: apply skin tension, rotate thread around forceps to limit dermal shearing. Post-removal care includes proper wound cleaning, appropriate dressing, and patient education on sun protection (1 year), hygiene, and warning signs requiring medical attention.

Suture removal technique: use scissors and gauze, clean the wound area with alcohol, use forceps to hold the suture, cut the suture on the side away from the wound (cut both strands), and pull the suture through the skin. Cutting on the wrong side can cause the suture to retract into the wound, introducing bacteria. Wound dressing application: use a square gauze pad with a central hole, position the hole over the wound, extend at least 0.5cm beyond the wound edges, and secure properly. If the wound is wet or bleeding, use gauze to absorb moisture. Apply a bandage over the dressing, extending at least 1cm beyond the wound edges, applied horizontally (not lengthwise) to prevent constriction. Post-suturing care includes: documenting the procedure in the patient's medical record, disposing of contaminated materials properly, and returning reusable equipment for sterilization. Patient instructions include: keeping the wound dry and clean, avoiding getting the wound wet, changing the dressing as needed, monitoring for signs of infection, and returning to the healthcare provider if infection is suspected. Nutrition: consume protein-rich foods (meat, eggs) to promote wound healing. Medication: take prescribed antibiotics as directed. Follow-up: return for suture removal (typically 7 days after suturing). Tetanus vaccination should be administered if not up to date.

This comprehensive educational video covers the complete suture removal procedure and post-operative care principles. The procedure includes: obtaining patient consent, assessing wound healing indicators (clean appearance, no infection signs), gathering materials (antiseptic solutions, sterile gauze, gloves, dissection scissors, needle holders), cleaning wounds from top to bottom, applying antiseptic to disinfect and hydrate tissues, and systematically removing sutures from top to bottom. Understanding suture types is essential: absorbable sutures (Vicryl) are absorbed in ~120 days, while non-absorbable sutures (silk, polypropylene, nylon) require removal. Surgical incision selection depends on urgency: vertical (parad) incisions are preferred for emergency cesarean sections due to minimal blood vessel exposure, while horizontal (Pfannenstiel) incisions are preferred for elective cases for better cosmetic results. Post-operative care emphasizes proper nutrition (avoid dairy and fatty foods, consume steamed vegetables and lean proteins), daily hygiene, monitoring for infection warning signs, and early mobilization with support.