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Which of these is true about a 6 French catheter? | Which of these is true about a 6 French catheter? | ||
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E. The internal diameter is 3 mm | E. The internal diameter is 3 mm | ||
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==Answer== | ==Answer== | ||
The answer is C. The French catheter scale (most correctly abbreviated as Fr, but also often abbreviated as FR or F) is commonly used to measure the outer diameter of cylindrical medical instruments including catheters. In the French Gauge system as it is also known, the diameter in millimeters of the catheter can be determined by dividing the French size by 3, thus an increasing French size corresponds with a larger diameter catheter. The following equations summarize the relationships: | The answer is C. The French catheter scale (most correctly abbreviated as Fr, but also often abbreviated as FR or F) is commonly used to measure the outer diameter of cylindrical medical instruments including catheters. In the French Gauge system as it is also known, the diameter in millimeters of the catheter can be determined by dividing the French size by 3, thus an increasing French size corresponds with a larger diameter catheter. The following equations summarize the relationships: | ||
D(mm) = Fr/3 or Fr = D(mm)*3 | D(mm) = Fr/3 or Fr = D(mm)*3 | ||
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The French Gauge was devised by Joseph-Frederic-Benoit Charriere, a 19th century Parisian maker of surgical instruments, who defined the "diameter times 3" relationship. | The French Gauge was devised by Joseph-Frederic-Benoit Charriere, a 19th century Parisian maker of surgical instruments, who defined the "diameter times 3" relationship. | ||
In some countries (especially French speaking), this unit is called Charriere and abbreviated as Ch. | In some countries (especially French speaking), this unit is called Charriere and abbreviated as Ch. | ||
==Notes== | ==Notes== | ||
<references /> | <references /> | ||
[[wikipedia:French_catheter_scale]] | [[wikipedia:French_catheter_scale]] | ||
Kibriya N1, Hall R, Powell S, How T, McWilliams RG. French sizing of medical devices is not fit for purpose. [http://www.ncbi.nlm.nih.gov/pubmed/23354967 Cardiovasc Intervent Radiol. 2013 Aug;36(4):1073-8.] | Kibriya N1, Hall R, Powell S, How T, McWilliams RG. French sizing of medical devices is not fit for purpose. [http://www.ncbi.nlm.nih.gov/pubmed/23354967 Cardiovasc Intervent Radiol. 2013 Aug;36(4):1073-8.] | ||
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