Specifications

Crown Size Selection

Crown Sizes

The eccentric diamond-coated Crown is available in diameters as listed in Table 1. Each Crown size has a specific

nose length (nose length is the length of the drive shaft from the Crown to the shaft tip).

Table 1. Crown Sizes

Crown Size Nose Length (mm)

1.50 mm 10

1.75 mm 15

2.00 mm 15

2.25 mm 20

Selecting a Crown Size

The most important factors in determining Crown orbit diameter and resulting lumen diameter are the proper selection

of Crown size, rotation speed, and treatment duration (number of passes back and forth through the lesion). The

eccentric diamond-coated Crown of the DB 360 is designed to remove a thin layer of the stenotic lesion with each

pass through the lesion. Rapid rotation of the Crown creates centrifugal forces that press the eccentric diamond-

coated Crown against the stenotic lesion. With each pass of the Crown, the diameter of the orbit increases while the

centrifugal force decreases until a maximum orbit diameter is achieved. Actual final orbit and lumen diameter will

depend on a variety of factors including the composition of the lesion, tortuousity of the vessel, and other factors.

See Appendix A for a visual representation of the relationship of the number of passes through the treatment area

and the resulting lumen diameter.

The physician should select a Crown size based on its ability to cross the lesion and the minimum proximal reference

vessel diameter within the treatment area. See Appendix B for the maximum orbit/resulting lumen diameter for each

DB 360 Crown.