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A French scale is used to measure the diameter of catheters and other medical instruments. It is based on a unit of measurement called a French (Fr) which is equal to 1/3 millimeter. By using a French scale, healthcare providers can select the appropriate size of catheter for a specific procedure or patient.

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AnswerThe French catheter scale, also known as French gauge or Charriere (Ch) after the creator of the measurement scale, is commonly used in describing the diameter of medical devices/tubing. It was developed in the 1800's by a French surgical instruments maker, Joseph-Frederic-Benoit Charriere, to describe the circumference of medical tubing. The idea is that a non-circular tube will fit into the same incision or blood vessel as a round one. Therefore French size = 2*pi*r (where r is the radius in mm). Usually French size is considered to be 3 times the diameter in millimeters or 1Fr = 1/3mm.


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