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Thus, the outer diameter of a catheter in millimeters can be calculated by dividing the French size by 3. [2] For example, a catheter with a French size of 9 would have an outer diameter of approximately 3 mm. While the French scale aligns closely with the metric system, it introduces redundancy and the potential for rounding errors.
The relative size of an indwelling urinary catheter is described using French units (Fr). [6] Alternatively, the size of a 10 Fr catheter might be expressed as 10 Ch (Charriere units – named after a 19th century French scientific instrument maker, Joseph-Frédéric-Benoît Charrière). The most common sizes are 10 Fr to 28 Fr. 1 Fr is ...
The traditional French units of measurement prior to metrication were established under Charlemagne during the Carolingian Renaissance. Based on contemporary Byzantine and ancient Roman measures , the system established some consistency across his empire but, after his death, the empire fragmented and subsequent rulers and various localities ...
During the early part of the twentieth century, the French introduced their own units of power – the poncelet, which was defined as being the power required to raise a mass of 100 kg against standard gravity with a velocity of 1 m/s, giving a value of 980.665 W. [16] [17] However, many other European countries defined their units of power ...
For larger mechanical tubing, however, the gauge number indicates the wall thickness, independent of the tube's overall size. In medicine, the Birmingham gauge is widely used to specify the outer diameter of hypodermic needles, catheters, cannulae, and suture wires. However, catheters are more commonly defined using the French catheter gauge ...
The ligne is still used by French and Swiss watchmakers. There are 12 lignes to one French inch . The standardized conversion for a ligne is 2.2558291 mm (1 mm = 0.443296 ligne), [4] and it is abbreviated with the letter L or represented by the triple prime, ‴. [5] One ligne is the equivalent of 0.0888 international inch.
Bullet diameter Case length Cartridge length Type Source in mm in mm in mm 2.34mm rimfire (for Swiss mini gun) ... (8 mm French 1892 Ordnance) .329 8.4: 1.07 27: 1.44 37:
3 Where's the inner diameter? 1 comment. Toggle the table of contents. Talk: French catheter scale. Add languages. Page contents not supported in other languages.