Difference between Cobra 1 Cobra 2 and Cobra 3 catheters

What is the difference between Cobra 1 Cobra 2 and Cobra 3 catheters?

A Cobra 1 catheter and a Cobra 2 catheter have the same general shape except that the radius of the secondary curve of the catheter is greater for the Cobra 2. A Cobra 3 catheter has the same general “cobra” shape, but the secondary curve is even greater still. The same nomenclature applies to Simmons catheters and others as well.

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