Blades with functional balance asymmetries for use with...

Surgery: kinesitherapy – Kinesitherapy – Ultrasonic

Reexamination Certificate

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C600S461000, C606S169000, C604S022000

Reexamination Certificate

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06976969

ABSTRACT:
Disclosed is an ultrasonic surgical instrument that combines 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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EPO Search Report dated Aug. 3, 2004 for related patent application 09/412,257, European Patent Application No. 00 96 1666.
International Standard IEC 61847 Ultrasonic—Surgical systems—“Measurement and declaration of the basic output characteristics” © IEC 1998 Droits de reproduction reserves.

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