245:
36:
225:). So, for example, if a two-way catheter of 20 Fr is compared to a 20 Fr three-way catheter, they both have the same external diameter but the two-way catheter will have a larger drainage channel than the three-way. Three-way catheters accommodate an extra channel for irrigation within a similar external diameter.
195:
The Charrière is measured by the ''outer'' diameter, and is defined as 1 Fr = 1/3 mm, and thus 1 mm = 3 Fr; therefore the diameter of a round catheter in millimetres can be determined by dividing the French size by 3. The French units roughly correspond to the outer circumference of the catheter
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For example, if the French size is 9, the diameter is 9/3 = 3.0; mm. It is seen that the French unit is fully redundant with the metric system but introduces potential for
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problem is further complicated by the mixed use of metric and imperial units in medical professions using catheters.
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236:, a 19th-century Parisian maker of surgical instruments, who defined the "diameter in mm times 3" relationship.
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An increasing French size corresponds to a larger external diameter. This is contrary to
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Iserson, Kenneth V. (1987). "J.-F.-B. Charrière: The man behind the "French" gauge".
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214:, where an increasing gauge corresponds to a smaller diameter needle.
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60:. Unsourced material may be challenged and removed.
221:of a catheter (not internal drainage channel, or
144:system is commonly used to measure the size of a
674:Poll, J. S. (1999). "The story of the gauge".
8:
120:Learn how and when to remove this message
251:
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152:, but can often be seen abbreviated as
7:
217:The French size is a measure of the
58:adding citations to reliable sources
148:. It is most often abbreviated as
25:
176:, its inventor). However, simply
27:French standard of catheter sizes
688:10.1046/j.1365-2044.1999.00895.x
234:Joseph-Frédéric-Benoît Charrière
164:. It may also be abbreviated as
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45:needs additional citations for
1:
749:Journal of Emergency Medicine
761:10.1016/0736-4679(87)90218-6
810:
264:
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69:"French catheter scale"
18:French (catheter scale)
249:
248:French catheter scale
247:
728:. Wolfram|Alpha
196:(see table below).
188:generally refers to
54:improve this article
650:American wire gauge
240:Size correspondence
250:
794:Tubing (material)
641:
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16:(Redirected from
801:
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655:Birmingham gauge
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212:Birmingham gauge
190:Birmingham gauge
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62:
38:
30:
21:
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265:Outer diameter
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232:was devised by
201:rounding errors
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5:
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682:(6): 575–581.
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223:inner diameter
219:outer diameter
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71: –
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65:Find sources:
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43:This article
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755:(6): 545–8.
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730:. Retrieved
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230:French gauge
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138:French gauge
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134:French scale
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52:Please help
47:verification
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676:Anaesthesia
205:metrication
783:Categories
726:"1 French"
661:References
80:newspapers
789:Catheters
696:0003-2409
273:(inches)
174:Charrière
142:Charrière
110:July 2011
732:20 March
712:41519791
704:10403873
644:See also
146:catheter
769:3323304
634:11.333
620:10.667
203:. This
94:scholar
767:
710:
702:
694:
637:0.445
631:35.60
623:0.419
617:33.51
609:0.393
603:31.42
595:0.367
592:9.333
589:29.32
581:0.341
578:8.667
575:27.23
567:0.315
561:25.13
553:0.288
550:7.333
547:23.04
539:0.263
536:6.667
533:20.94
525:0.249
522:6.333
519:19.90
511:0.236
505:18.85
497:0.223
494:5.667
491:17.81
483:0.210
480:5.333
477:16.76
469:0.197
463:15.71
455:0.184
452:4.667
449:14.66
441:0.170
438:4.333
435:13.61
427:0.158
421:12.57
413:0.144
410:3.667
407:11.52
399:0.131
396:3.333
393:10.47
385:0.118
371:0.105
368:2.667
357:0.092
354:2.333
343:0.079
329:0.066
326:1.667
315:0.053
312:1.333
301:0.039
287:0.026
284:0.667
257:gauge
255:French
96:
89:
82:
75:
67:
708:S2CID
379:9.42
365:8.38
351:7.33
337:6.28
323:5.24
309:4.19
295:3.14
281:2.09
262:(mm)
178:gauge
172:(for
101:JSTOR
87:books
765:PMID
734:2012
700:PMID
692:ISSN
270:(mm)
228:The
132:The
73:news
757:doi
684:doi
628:34
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184:or
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56:by
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376:9
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320:5
306:4
298:1
292:3
278:2
192:.
186:GA
180:,
170:Ch
166:CH
158:FR
156:,
154:Fg
150:Fr
136:,
771:.
759::
753:5
736:.
714:.
686::
182:G
162:F
123:)
117:(
112:)
108:(
98:·
91:·
84:·
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50:.
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