Flashcards in Instruments and Materials Deck (31):
Stainless steel blades are sharper than carbon steel blades.
Carbon steel sharper
The most common scalpel and blade system used in dermatological surgery is the Bard-Parker
Carbon steel blades will maintain their sharpness longer than stainless steel blades.
Stainless steel sharpness lasts longer
Teflon coatings on scalpel blades reduce drag when cutting through tissue.
The #10 blade is wide with a sharp, convex belly, making it ideal for large excisions on thick skin, such as the trunk.
The #11 blade is tapered to a sharp point and used primarily for incision and drainage or for cutting sharp angles on flaps.
The #15 blade is shaped like a smaller version of the #10 blade.
used most often in derm surg
The Beaver handle is the handle of choice for large excisions on thick skin.
Best for small delicate work.
The iris scissor is sharp-tipped, short-handles and most often used for blunt or sharp dissection and cutting on the head and neck.
The Westcott scissor is similar to the iris scissor, except the blades are curved and tapered to a fine point tip.
This is true for the Gradle scissor
The Gradle scissor is unique in that it operates on a spring system where the blades come together as the handle arc is squeezed.
This is true for the Westcott scissor
The Mayo scissor has an almost 1-to-1 handle to blade ratio and is used for coarse dissection.
The Metzenbaum scissor is long-handled and is ideal for blunt or sharp dissection in areas that require a long reach.
Scissors that are used for cutting tissue will dull much faster if used to cut sutures as well.
Serrated forceps allow a firm grasp of tissue with reduced crush injury.
This is true for toothed forceps
Adson forceps have a relatively broad handle that tapers to a long, narrow tip.
They can be toothed or serrated
Skin hooks are less traumatic to the epidermis than forceps.
Haemostats are used for haemostasis of bleeding vessels.
Dull curettes create excessive tissue trauma and suboptimal outcome.
Tensile strength is not analogous to suture strength.
Suture strength is calculated by dividing the weight necessary to break the suture by its cross-sectional area.
Monofilament and synthetic sutures have less tissue reactivity than polyfilament and natural sutures.
Absorbable suture loses most of its tensile strength within 120 days of placement through either enzymatic digestion or tissue hydrolysis.
60 days, everything else is true
Surgical gut is rapidly degraded in 14 days.
The disadvantages of surgical gut include poor tensile strength, high tissue reactivity and poor knot stability.
Polydiaxone (PDS) is absorbed much faster than Dexon or Vicryl suture.
Much more slowly
Polyglactin 910 (Vicryl) is ideal for suturing cartilage because of its minimal tissue reactivity.
This is true for PDS
Oils and grease can be used for lubricating instruments.
Harden during sterilisation
Steam sterilisation is the most popular office method of sterilisation.
Steam autoclaves do not affect the sharpness of instruments.
Can dull sharp instruments