Encyclopedia of Knots.pdf

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BASIC KNOTS ............................................................................................................................................. 2
K
NOT
S
ECURITY
.......................................................................................................................................... 3
G
ENERAL
P
RINCIPLES OF
K
NOT
T
YING
........................................................................................................ 5
SQUARE KNOT ........................................................................................................................................... 7
S
QUARE
K
NOT
P
ICTURES
............................................................................................................................. 7
T
WO
H
AND
T
ECHNIQUE
............................................................................................................................... 8
Square Knot
Two-Hand Technique
Page 1 of 3 .................................................................................... 8
Square Knot
Two-Hand Technique
Page 2 of 3 .................................................................................. 10
Square Knot
Two-Hand Technique
Page 3 of 3 .................................................................................. 11
O
NE
-H
ANDED
T
ECHNIQUE
........................................................................................................................ 12
Square Knot
One-Hand Technique
Page 1 of 2 .................................................................................. 12
SURGEON’S OR FRICTION KNOT....................................................................................................... 14
S
URGEON
'
S OR
F
RICTION
K
NOT
P
AGE
1
OF
3 ............................................................................................ 14
S
URGEON
'
S OR
F
RICTION
K
NOT
P
AGE
2
OF
3 ............................................................................................ 16
S
URGEON
'
S OR
F
RICTION
K
NOT
P
AGE
3
OF
3 ............................................................................................ 17
DEEP TIE.................................................................................................................................................... 19
D
EEP
T
IE
P
AGE
1
OF
2 ............................................................................................................................... 19
D
EEP
T
IE
P
AGE
2
OF
2 ............................................................................................................................... 21
LIGATION AROUND HEMOSTATIC CLAMP.................................................................................... 22
L
IGATION
A
ROUND
M
EMOSTATIC
C
LAMP
-M
ORE
C
OMMON OF
T
WO
M
ETHODS
....................................... 22
L
IGATION
A
ROUND
H
EMOSTATIC
C
LAMP
-A
LTERNATE
T
ECHNIQUE
......................................................... 24
INSTRUMENT TIE ................................................................................................................................... 26
I
NSTRUMENT
T
IE
P
AGE
1
OF
2 ................................................................................................................... 26
I
NSTRUMENT
T
IE
P
AGE
2
OF
2 ................................................................................................................... 28
GRANNY KNOT ........................................................................................................................................ 29
SUTURE MATERIALS ............................................................................................................................. 30
PRINCIPLES OF SUTURE SELECTION .............................................................................................. 32
PRINCIPLES OF SUTURE SELECTION .............................................................................................. 32
ABSORBABLE SUTURES........................................................................................................................ 34
A
BSORBABLE
S
UTURES
P
AGE
1 ................................................................................................................. 34
A
BSORBABLE
S
UTURES
P
AGE
2 ................................................................................................................. 36
NONABSORBABLE SUTURES ............................................................................................................... 40
N
ONABSORBABLE
S
UTURES
P
AGE
1 .......................................................................................................... 40
N
ONABSORBABLE
S
UTURES
P
AGE
2 .......................................................................................................... 42
TRADEMARKS.......................................................................................................................................... 45
SURGICAL NEEDLES.............................................................................................................................. 46
PRACTICE BOARD .................................................................................................................................. 48
SELECTED TERMS.................................................................................................................................. 49
Basic Knots
The knots demonstrated on the following pages are those most frequently used, and are
applicable to all types of operative procedures. The camera was placed behind the
demonstrator so that each step of the knot is shown as seen by the operator. For clarity,
one-half of the strand is purple and the other white.
The purple working strand is
initially held in the right hand
.
The left-handed person may choose to study the
photographs in a mirror.
1.
Simple knot:
incomplete basic unit
2.
Square knot:
completed knot
3.
Surgeon's or Friction knot:
completed tension knot
Knot Security
The knots demonstrated on the following pages are those most frequently used, and are
applicable to all types of operative procedures. The camera was placed behind the
demonstrator so that each step of the knot is shown as seen by the operator. For clarity,
one-half of the strand is purple and the other white.
The purple working strand is
initially held in the right hand
.
The left-handed person may choose to study the
photographs in a mirror.
1.
Simple knot:
incomplete basic unit
2.
Square knot:
completed knot
3.
Surgeon's or Friction knot:
completed tension knot
Knot Security
The construction of ETHICON* sutures has been carefully designed to produce the
optimum combination of strength, uniformity, and hand for each material. The term
hand
is the most subtle of all suture quality aspects. It relates to the feel of the suture in the
surgeon's hands, the smoothness with which it passes through tissue and ties down, the
way in which knots can be set and snugged down, and most of all, to the firmness or body
of the suture.
Extensibility
relates to the way in which the suture will stretch slightly
during knot tying and then recover. The stretching characteristics provide the signal that
alerts the surgeon to the precise moment when the suture knot is snug.
Multifilament sutures are generally easier to handle and to tie than monofilament sutures,
however, all the synthetic materials require a specific knotting technique. With
multifilament sutures, the nature of the material and the braided or twisted construction
provide a high coefficient of friction and the knots remain as they are laid down. In
monofilament sutures, on the other hand, the coefficient of friction is relatively low,
resulting in a greater tendency for the knot to loosen after it has been tied. In addition,
monofilament synthetic polymeric materials possess the property of memory.
Memory
is
the tendency not to lie flat, but to return to a given shape set by the material's extrusion
process or the suture's packaging. The RELAY* suture delivery system delivers sutures
with minimal package memory due to its unique package design.
Suture knots must be properly placed to be secure. Speed in tying knots may result in less
than perfect placement of the strands. In addition to variables inherent in the suture
materials, considerable variation can be found between knots tied by different surgeons
and even between knots tied by the same individual on different occasions.
General Principles of Knot Tying
Certain general principles govern the tying of all knots and apply to all suture materials.
1. The completed knot must be firm, and so tied that slipping is virtually impossible.
The simplest knot for the material is the most desirable.
2. The knot must be as small as possible to prevent an excessive amount of tissue
reaction when absorbable sutures are used, or to minimize foreign body reaction
to nonabsorbable sutures. Ends should be cut as short as possible.
3. In tying any knot, friction between strands ("sawing") must be avoided as this can
weaken the integrity of the suture.
4. Care should be taken to avoid damage to the suture material when handling.
Avoid the crushing or crimping application of surgical instruments, such as
needleholders and forceps, to the strand except when grasping the free end of the
suture during an instrument tie.
5. Excessive tension applied by the surgeon will cause breaking of the suture and
may cut tissue. Practice in avoiding excessive tension leads to successful use of
finer gauge materials.
6. Sutures used for approximation should not be tied too tightly, because this may
contribute to tissue strangulation.
7. After the first loop is tied, it is necessary to maintain traction on one end of the
strand to avoid loosening of the throw if being tied under any tension.
8. Final tension on final throw should be as nearly horizontal as possible.
9. The surgeon should not hesitate to change stance or position in relation to the
patient in order to place a knot securely and flat.
10. Extra ties do not add to the strength of a properly tied knot. They only contribute
to its bulk. With some synthetic materials, knot security requires the standard
surgical technique of flat and square ties with additional throws if indicated by
surgical circumstance and the experience of the surgeon.
An important part of good suturing technique is correct method in knot tying. A seesaw
motion, or the sawing of one strand down over another until the knot is formed, may
materially weaken sutures to the point that they may break when the second throw is
made or, even worse, in the postoperative period when the suture is further weakened by
increased tension or motion.

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