A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 17/34 (2006.01)
Patent
CA 2550876
A surgical obturator includes an obturator member having a distal end and a proximal end, and a blade member adjacent the distal end of the obturator member. The blade member includes first and second surfaces intersecting to define a peripheral cutting edge. At least one, preferably, both, of the first and second surfaces is curved. At least one, preferably, both, of the first and second surfaces is generally concave. The peripheral cutting edge defined by the first and second intersecting surfaces is substantially linear and obliquely arranged with respect to the longitudinal axis of the obturator member. The peripheral cutting edge may define an angle ranging from about 18° to about 22° with respect to the longitudinal axis. Alternatively, the peripheral cutting edge defined by the first and second surfaces is generally arcuate, and may be concave or convex in configuration. In accordance with one preferred embodiment, the blade member includes opposed pairs of intersecting first and second surfaces, which define opposed peripheral cutting edges. The opposed peripheral cutting edges extend to the penetrating end of the blade member. A hollow grinding technique is employed to form the curved surfaces and resulting cutting edges. Such technique provides significant benefits with respect to tissue resistance and drag.
Smith Robert C.
Wenchell Thomas
Mcfadden Fincham
Tyco Healthcare Group Lp
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