Blades with functional balance asymmetries for use with ultrasonic surgical instruments
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United States of America Patent
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Aug 30, 2016
Grant Date -
Dec 11, 2014
app pub date -
Aug 25, 2014
filing date -
Oct 5, 1999
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Disclosed is an ultrasonic surgical instrument that combines blade end-effector geometry to best affect the multiple functions of a shears-type configuration. The shape of the blade is characterized by a radiused cut offset by some distance to form a curved geometry. The cut creates a curved surface with multiple asymmetries causing multiple imbalances within the blade. Imbalance due to the curve of the instrument is corrected by a non-functional asymmetry proximal to the functional asymmetry. Imbalance due to the asymmetric cross-section of the blade is corrected by the appropriate selection of the volume and location of material removed from a functional asymmetry. The shape of the blade in one embodiment of the present invention is characterized by two radiused cuts offset by some distance to form a curved and potentially tapered geometry. These two cuts create curved surfaces including a concave surface and a convex surface. The length of the radiused cuts affects, in part, the acoustic balancing of the transverse motion induced by the curved shape.
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