Basic Wound Closure & Knot Tying Primer

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Presentation transcript:

Basic Wound Closure & Knot Tying Primer

Objectives Provide basic information on commonly used suture materials Review general principles of wound closure Provide a general overview of basic surgical knot tying

Suture Material Generally categorized by three characteristics: Absorbable vs. non-absorbable Natural vs. synthetic Monofilament vs. multifilament

Absorbable Suture Degraded and eventually eliminated in one of two ways: Via inflammatory reaction utilizing tissue enzymes Via hydrolysis Examples: “Catgut” Chromic Vicryl Monocryl PDS

Non-absorbable Suture Not degraded, permanent Examples: Prolene Nylon Stainless steel Silk* (*not a truly permanent material; known to be broken down over a prolonged period of time—years)

Natural Suture Biological origin Cause intense inflammatory reaction Examples: “Catgut” – purified collagen fibers from intestine of healthy sheep or cows Chromic – coated “catgut” Silk

Synthetic Suture Synthetic polymers Do not cause intense inflammatory reaction Examples: Vicryl Monocryl PDS Prolene Nylon

Monofilament Suture Grossly appears as single strand of suture material; all fibers run parallel Minimal tissue trauma Resists harboring microorganisms Ties smoothly Requires more knots than multifilament suture Possesses memory Examples: Monocryl, PDS, Prolene, Nylon

Multifilament Suture Fibers are twisted or braided together Greater resistance in tissue Provides good handling and ease of tying Fewer knots required Examples: Vicryl (braided) Chromic (twisted) Silk (braided)

Suture Degradation Suture Material Method of Degradation Time to Degradation “Catgut” Proteolytic enzymes Days Vicryl, Monocryl Hydrolysis Weeks to months PDS Months

Suture Size Smaller -------------------------------------Larger Sized according to diameter with “0” as reference size Numbers alone indicate progressively larger sutures (“1”, “2”, etc) Numbers followed by a “0” indicate progressively smaller sutures (“2-0”, “4-0”, etc) Smaller -------------------------------------Larger .....”3-0”...”2-0”...”1-0”...”0”...”1”...”2”...”3”.....

Needles Classified according to shape and type of point Curved or straight (Keith needle) Taper point, cutting, or reverse cutting

Needles Curved Straight Designed to be held with a needle holder Used for most suturing Straight Often hand held Used to secure percutaneously placed devices (e.g. central and arterial lines)

Needles Taper-point needle Round body Used to suture soft tissue, excluding skin (e.g. GI tract, muscle, fascia, peritoneum)

Needles Cutting needle Triangular body Sharp edge toward inner circumference Used to suture skin or tough tissue

Suture Packaging

Wound Closure Basic suturing techniques: Simple sutures Mattress sutures Subcuticular sutures Goal: “approximate, not strangulate”

Simple Sutures Simple interrupted stitch Single stitches, individually knotted (keep all knots on one side of wound) Used for uncomplicated laceration repair and wound closure

Mattress Sutures Horizontal mattress stitch Provides added strength in fascial closure; also used in calloused skin (e.g. palms and soles) Two-step stitch: Simple stitch made Needle reversed and 2nd simple stitch made adjacent to first (same size bite as first stitch)

Mattress Sutures Vertical mattress stitch Affords precise approximation of skin edges with eversion Two-step stitch: Simple stitch made – “far, far” relative to wound edge (large bite) Needle reversed and 2nd simple stitch made inside first – “near, near” (small bite)

Subcuticular Sutures Usually a running stitch, but can be interrupted Intradermal horizontal bites Allow suture to remain for a longer period of time without development of crosshatch scarring

Steri-strips Sterile adhesive tapes Available in different widths Frequently used with subcuticular sutures Used following staple or suture removal Can be used for delayed closure

Staples Rapid closure of wound Easy to apply Evert tissue when placed properly

Two-Hand Square Knot Easiest and most reliable Used to tie most suture materials

Instrument Tie Useful when one or both ends of suture material are short Commonly used technique for laceration repair

References Encyclopedia of Knots provided by Ethicon; available at www.jnjgateway.com/public/USENG/5256ETHICON_Encyclopedia_of_Knots.pdf (More extensive overview of knot tying with photos for those interested in surgery) Blackbourne, LH, editor. Surgical Recall. 2nd ed. Baltimore: Lippincott Williams & Wilkins; 1998 Cameron, JL, editor. Current Surgical Therapy. 7th ed. St. Louis: Mosby; 2001 Edgerton, MT. The Art of Surgical Technique. Baltimore: Williams & Wilkins; 1988 (Excellent resource for technical details of surgery) Gomella, LG, Haist, SA. Clinician’s Pocket Reference. 9th ed. New York: McGraw-Hill Medical Publishing Division; 2002 (Useful book for anyone doing clinical rotations!)