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
