Chapter 16 - Suture Materials and Patterns Flashcards
What is the maximum tensile strength loss period for absorbable sutures?
A) 30 days B) 45 days C) 60 days D) 90 days
C) 60 days
What classification of sutures undergoes degradation through hydrolysis and enzymatic digestion?
A) Nonabsorbable B) Synthetic C) Natural D) Multifilament
C) Natural
How many components are there in a surgical needle?
A) 1 B) 2 C) 3 D) 4
C) 3
Figure 16-1. Anatomy of a surgical needle.
Figure 16-2. Various points and shaft designs of surgical needles. (A) Taperpoint; (B) tapercut; (C) regular cutting; (D) reverse cutting; (E) spatula point; (F) blunt point.
What is the relative knot security (RKS) formula expressed as a percentage?
A) (TS/KHC) × 100 B) (KHC/TS) × 100 C) (TS/TS) × 100 D) (RKS/TS) × 100
B) (KHC/TS) × 100
What type of needle is specifically mentioned for use in ophthalmologic surgery?
A) Cutting needle B) Taper point needle C) 1/4-circle needle D) Blunt-point needle
C) 1/4-circle needle
What is the typical percentage increase in knot security for multifilament sutures due to their frictional values?
A) 25% B) 50% C) 75% D) 100%
B) 50%
How many types of degradation mechanisms are there for absorbable sutures?
A) 1 B) 2 C) 3 D) 4
C) 3
What is the main component of a surgical needle that affects its tissue penetration?
A) Length B) Body shape C) Point shape D) Attachment end
C) Point shape
How much should a selected suture’s strength compare to normal tissue strength?
A) At least 50% B) At least 75% C) Equal to D) Less than
C) Equal to
What is the tensile strength (TS) of a suture?
A) Maximum load before knot failure B) Force a suture can withstand before breaking C) Strength of tissue surrounding the suture D) Amount of tension during tying
B) Force a suture can withstand before breaking
What is the most common configuration for surgical needles used in general procedures?
A) Straight needles B) 1/4-circle needles C) 3/8- or 1/2-circle needles D) Blunt-point needles
C) 3/8- or 1/2-circle needles
What is the effect of coating on multifilament sutures?
A) Increases capillarity B) Reduces tissue drag C) Decreases knot security D) Both B and C
D) Both B and C
How is suture size expressed in the United States Pharmacopoeia (USP) standard?
A) By millimeter B) By number C) By diameter D) By cross-sectional diameter
D) By cross-sectional diameter
What percentage of knot-holding capacity (KHC) is typically ideal for surgical sutures?
A) 50% B) 70% C) 90% D) 100%
C) 90%
How does the capillarity of multifilament sutures impact surgical outcomes?
A) Reduces infection risk B) Facilitates healing C) Increases risk of infection D) Decreases tissue drag
C) Increases risk of infection
What type of suture is designed to penetrate delicate tissues without causing trauma?
A) Cutting needle B) Blunt-point needle C) Spatula needle D) Taper point needle
D) Taper point needle
What is the torsional stiffness and diameter of a suture related to?
A) Elasticity B) Flexibility C) Knot security D) Capillarity
B) Flexibility
How are surgical needles classified based on their shape?
A) Straight, curved, and flexible B) Straight, half-curved, and curved C) Long, short, and medium D) Standard, specialty, and custom
B) Straight, half-curved, and curved
What is the ideal feature of a suture that has low tissue drag?
A) High elasticity B) Smooth surface C) High capillarity D) Monofilament structure
B) Smooth surface
Which type of needle has a cutting edge on the outer curvature?
A) Regular cutting needle B) Reverse cutting needle C) Taper point needle D) Blunt-point needle
B) Reverse cutting needle
What is the relationship between knot security and friction for multifilament sutures?
A) Inversely proportional B) Directly proportional C) No correlation D) Undefined
B) Directly proportional
How long must the suture be to penetrate both wound margins effectively?
A) As long as the wound B) At least 1.5 times the wound length C) At least 2 times the wound length D) At least 3 times the wound length
B) At least 1.5 times the wound length