>>>40.14 Medical Instruments and Devices
Table of Contents, Chap. 40>>>40.14.01 French Size for Catheters
Overview:
French units is one method for describing the size of catheters.
NOTES:
(1) The French size is about a third of the catheter external diameter in mm.
(2) The luminal diameter depends on the wall thickness.
|
French Size |
External Diameter (OD) in mm |
|
3 |
1.0 |
|
4 |
1.35 |
|
5 |
1.67 |
|
6 |
2.0 |
|
7 |
2.3 |
|
8 |
2.7 |
|
9 |
3.0 |
|
10 |
3.3 |
|
11 |
3.7 |
|
12 |
4.0 |
|
13 |
4.3 |
|
14 |
4.7 |
|
15 |
5.0 |
|
16 |
5.3 |
|
17 |
5.7 |
|
18 |
6.0 |
|
19 |
6.3 |
|
20 |
6.7 |
|
22 |
7.3 |
|
24 |
8.0 |
|
26 |
8.7 |
|
28 |
9.3 |
|
30 |
10.0 |
|
32 |
10.7 |
|
34 |
11.3 |
References:
Droste C von Planta M. Memorix: Clinical Medicine. Chapman & Hall Medical. 1997. page 6.
>>>40.14.02 Gauge for Hypodermic Needles
Overview:
The diameter of hypodermic needles is expressed as a gauge. The higher the gauge the smaller the diameter of the needle. To aid in the identification of the needle manufacturers may color-code the individual needles.
NOTE:
(1) Different manufacturers may use different color coding. The following is used by Becton Dickinson (BD) for its PrecisionGlide syringe needles.
(2) The diameter associated with each gauge shows some variation.
|
Gauge |
External Diameter in mm (alternate) |
Color (BD) |
|
6 |
5.16 5 | |
|
7 |
4.57 4.45 | |
|
8 |
4.19 4 | |
|
9 |
3.76 3.68 | |
|
10 |
3.40 3.28 | |
|
11 |
3.05 3 | |
|
12 |
2.77 2.67 | |
|
13 |
2.41 2.4 | |
|
14 |
2.11 2.03 | |
|
15 |
1.83 |
|
|
16 |
1.65 |
purple |
|
17 |
1.50 |
|
|
18 |
1.27 1.25 |
pink |
|
19 |
1.07 1.09 | |
|
20 |
0.89 0.9 |
yellow |
|
21 |
0.81 0.82 0.8 |
green |
|
22 |
0.71 0.7 |
black |
|
23 |
0.64 0.65 |
turquoise |
|
24 |
0.56 |
|
|
25 |
0.51 0.5 |
blue |
|
26 |
0.46 0.45 |
tan |
|
27 |
0.41 0.4 |
gray |
|
28 |
0.36 |
|
|
29 |
0.33 0.35 | |
|
30 |
0.30 |
beige (grayish tan) |
|
31 |
0.25 |
|
|
32 |
0.23 |
|
|
33 |
0.20 |
|
|
34 |
0.18 |
|
|
35 |
0.13 |
References:
Droste C von Planta M. Memorix: Clinical Medicine. Chapman & Hall Medical. 1997. page 6.
Fisher Health Care Catalogue 2001. page 428.
Standard hypodermic stock range. Downloaded from www.merckeurolab.ltd.uk.