French (unità di misura)

French
Informazioni generali
Grandezzalunghezza
SimboloFr, FR, F, Ch, CH
Conversioni
1 Fr in... ...equivale a...
Unità SI0,3333 mm
Unità Imp0,0131 inch
Modifica dati su Wikidata · Manuale

Il French o Charrière è un'unità di misura di diametro che non fa parte del sistema internazionale, comunemente utilizzato per misurare la dimensione di un catetere in base al suo diametro esterno. Viene spesso abbreviato come Fr, FR, Fg o F, ma può essere espresso anche come CH o Ch (per Charrière, il suo inventore) nei paesi francofoni.

L'indicatore è stato ideato dal francese Joseph-Frédéric-Benoît Charrière, un costruttore di strumenti chirurgici della Parigi del XIX secolo che definì la relazione "3 volte il diametro":[1] infatti il diametro in millimetri di un catetere può essere determinato dividendo per 3 la dimensione in French: o . Così, 1 millimetro corrisponde a 3 Fr; e ad esempio se la dimensione in French è 9, il diametro è di 3 mm.

Una misura crescente di French corrisponde a un catetere di diametro maggiore; ciò è contrario all'unità di misura Gauge, in cui un indicatore crescente corrisponde ad un diametro minore del catetere. Inoltre la misura di French o Charrière corrisponde al diametro esterno, mentre il Gauge si riferisce al diametro interno.

Corrispondenze della scala

Valore
French 		Diametro (mm) Diametro (pollici)
3 1 0,039
4 1,35 0,053
5 1,67 0,066
6 2 0,079
7 2,3 0,092
8 2,7 0,105
9 3 0,118
10 3,3 0,131
11 3,7 0,144
12 4 0,158
13 4,3 0,170
14 4,7 0,184
15 5 0,197
16 5,3 0,210
17 5,7 0,223
18 6 0,236
19 6,3 0,249
20 6,7 0,263
22 7,3 0,288
24 8 0,315
26 8,7 0,341
28 9,3 0,367
30 10 0,393
32 10,7 0,419
34 11,3 0,445

Note

  1. ^ Kenneth V. Iserson, J.-F.-B. Charrière: The man behind the "French" gauge, in Journal of Emergency Medicine, vol. 5, n. 6, 1987, pp. 545–8, DOI:10.1016/0736-4679(87)90218-6, PMID 3323304.

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