Patent ID: 8092217

Claim:
A suckback prevention device in combination with a single use high-speed turbine dental drill handpiece, said high-speed turbine dental drill handpiece comprising a drilling needle and a head comprising a head housing and a wind wheel axle, said wind wheel axle being disposed inside said head housing for driving the rotation of said drilling needle and said drilling needle being connected to said wind wheel axle, the suckback prevention device comprising an annular opening in a two-step profile shape; an elastic bowl-shaped axle shroud; an annular skeleton; and an annular screw; wherein said annular opening is disposed in said head housing around said wind wheel axle and said drilling needle; said elastic bowl-shaped axle shroud and said annular skeleton are disposed in an inner-step part of said annular opening; an eyelet for said drilling needle is set at the center of said elastic bowl-shaped axle shroud, and the diameter of said eyelet is slightly larger than the outer diameter of said drilling needle; said elastic bowl-shaped axle shroud is disposed in said annular skeleton, and said elastic bowl-shaped axle shroud and said annular skeleton are hot pressed together; and said annular screw is disposed in an outer-step part of said annular opening for fixing said annular skeleton and said elastic bowl-shaped axle shroud.