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Anaesthesia and surgery > Suturing > Flashcards

Flashcards in Suturing Deck (39)
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1

Describe a swaged needle

Passes through tissue with less drag than eyed needle
As a new needle is used each time, it is sharp
Suture is secured to the needle
Relatively expensive
Useful for delicate tissue as less traumatic

2

Describe an eyed needle

Greater bulk at eye increases drag (needle should not be double threaded)
Needles are commonly re-used and therefore cheaper
Care must be taken to keep needle joined to the suture

3

The choice of needle shape is often governed by...

the accessibility of the tissue to be sutured. The more confined the operative site, the greater the curvature needed

4

What are the most commonly used needles in practice?

1/2 curved
1/2 circle
curved needle
straight needle

5

Round bodied needles are designed to...

separate tissue fibres rather than cut them. Leak proof suture line.

6

Describe a taper point needle

Needle body is rounded and tapers to a point

Combines initial penetration of a cutting needle with the minimised trauma of a round bodied needle.

7

Describe a blunt point needle

Designed for suturing extremely friable tissue such as the liver

8

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9

What are cutting needles used for?

Required for suturing fibrous or dense tissues

10

Describe a reverse cutting needle

Body of needle is triangular with apex on outside of needle curvature

11

Describe a regular cutting needle

Body of needle is triangular with apex on inside of the needle curvature

12

Describe absorbable suture material

Undergo degradation and loss of strength after 60 days

Used internally where long term support is not required

13

Describe non-absorbable suture material

Maintain their tensile strength for longer than 60 days

Neither phagoctosed or hydrolysed, encapsulated within fibrous tissue

14

Describe natural suture materials

Come from naturally occurring organic fibres

15

Describe synthetic suture materials

Made from 'man made' fibres

Synthetic materials are hydrolysed and tend to produce minimal tissue reaction

16

What are suture materials described as monofilament or multi-filament?

Depends if they are made from multiple strands or single strand

17

Describe capillarity

Extent to which tissue fluids are attracted along a length of suture material

18

Describe chatter

The lack of smoothness as a throw of knot is tightened down

smoothness = no chatter

19

Describe coated

Secondary coating over primary material to modify

20

Describe knot security

Relates to the surface frictional characteristics of the material

21

Describe memory

The tendency of the material to return to its original shape

Often mono-filaments that have good memory

22

Describe tensile strength

Breaking strength per unit area of tissue

23

Describe tissue drag

The degree of frictional force as the material is pulled through the tissue

24

Describe tissue reaction

The response of the tissue to the suture material involved

25

Synthetic suture materials cause...

less tissue reaction

26

Mono-filament materials are...

less reactive and much less likely to harbour bacteria

27

Braided materials...

have more tissue drag and cause more tissue tension

28

Bacteria harbour in between...

the fibres of braided materials

29

Most braided materials are now...

coated to reduce tissue drag, but this reduces knot security

30

Mono-filaments have...

significant memory and can be difficult to handle