SUTURE MATERIALS AND TECHNIQUES

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Presentation transcript:

SUTURE MATERIALS AND TECHNIQUES

The Ideal Suture Material Can be used in any tissue Easy to handle Good knot security Minimal tissue reaction

The Ideal Suture Material Unfriendly to bacteria Strong yet small Won’t tear through tissues Cheap

What’s It Used for? To bring tissue edges together and speed wound healing (=tissue apposition) Orthopedic surgery to help stabilize joints Repair ligaments Ligate vessels or tissues

Types of Needles Eyed needles More Traumatic Only thread through once Suture on a reel Tends to unthread itself easily

Types of Needles Swaged-on needles Much less traumatic More expensive suture material Sterile

Points of Needles Taper Atraumatic Internal organs

Points of Needles Cutting Skin Traumatic Cutting edge on inside of circle Skin Traumatic

Points of Needles Reverse Cutting Skin Less traumatic than cutting Cutting edge on outside of circle Skin Less traumatic than cutting

Cutting vs Reverse Cutting

Shapes of Needles 3/8 circle 1/2 circle Straight Specialty

Characteristics of Suture Material Absorbable Vs. Nonabsorbable Monofilament Vs. Multifilament Natural or Synthetic

Absorbable Sutures Internal Intradermal/ subcuticular Rarely on skin

Non-absorbable Suture Primarily Skin Needs to be removed later Stainless steel = exception Can be used internally Ligature Orthopedics Can be left in place for long periods

Reading the Suture Label Order Code Size Also: LENGTH NEEDLE SYMBOL COLOR Absorbable or Non Name Needle Company

Choosing Absorbable Vs. Nonabsorbable How long you need it to work Do you want to see the animal again for suture removal

Monofilament Vs. Multifilament memory easy to handle less tissue drag more tissue drag doesn’t wick wicks/ bacteria poor knot security good knot security - tissue reaction +tissue reaction

Natural Vs. Synthetic Natural: All are absorbable Gut Chromic Gut Silk Collagen All are absorbable

Gut/ Chromic Gut Made of submucosa of small intestines Multifilament Breaks down by phagocytosis: inflammatory reaction common

Gut/ Chromic Gut Chromic: tanned, lasts longer, less reactive Easy handling Plain: 3-5 days Chromic: 10-15 days Bacteria love this stuff!

Collagen and Silk Natural sutures VERY reactive, absorbable Ophthalmic surgery only

Vicryl (Polyglactin 910) Braided, synthetic, absorbable Stronger than gut: retains strength 3 weeks Broken down by enzymes, not phagocytosis Break-down products inhibit bacterial growth Can use in contaminated wounds, unlike other multifilaments

Dexon and PGA Polymer of glycolic acids Braided, synthetic, absorbable Broken down by enzymes Both PGA and dexon have increased tissue drag, good knot security Both are stronger than gut

PDS (polydioxine) Monofilament (less drag, worse knot security – lots of “memory”) Synthetic, absorbable Very good tensile strength (better than gut, vicryl, dexon) which lasts months Absorbed completely by 182 days

Maxon (polyglyconate) Monofilament- memory Synthetic Absorbable Very little tissue drag Poor knot security Very strong

NONABSORBABLE SUTURES Natural or Synthetic Monofilament or multifilament                            

NYLON Synthetic Mono or Multifilament Memory Very little tissue reaction Poor knot security

Polymerized Caprolactum Vetafil, Braunamid, Supramid Multifilament suture with protein coating Synthetic Good knot security, easy handling Not very reactive Don’t use in contaminated wound Usually comes on a reel

Polypropylene Prolene, Surgilene Monofilament, Synthetic Won’t lose tensile strength over time Good knot security Very little tissue reaction

Stainless Steel Monofilament Strongest ! Great knot security Difficult handling Can cut through tissues Very little tissue reaction, won’t harbor bacteria

Suture Sizes Sized #5-4-3-2-1-0-00-000-0000…30-0 00 = 2-0, “two ought” BIGGER >>>>>>>>>>>>>>>>SMALLER 00 = 2-0, “two ought” SA : 0 through 3-0 (Optho 5-0 >>7-0) LA : 0 through 3

Suture Sizes (cont) Stainless Steel In gauges (like needles) Smaller gauge = bigger, stronger Larger gauge= smaller, finer 26 gauge = “ought” 28 gauge = 2-0

Skin Staples Very common in human medicine Expensive Very easy Very secure Very little tissue reaction Removal = Special tool required

Tissue Adhesive Nexaband, Vetbond, and others Little strength Should not be placed between skin layers or inside body

Suture Patterns

Knot Strength Generally 4 “throws” for >90% knot security (nylon may need 5) Less “throws” = more likely to untie itself Stainless steel = exception again 2 “throws” = 99% knot security

Simple Interrupted Simple Interrupted Suture

Simple Continuous

Ford Interlocking

Subcuticular

http://cal.vet.upenn.edu/surgery/index.html