Endoscopic hook blade and use thereof

Inventors

Mirza, Ather • Mirza, Romi

Assignees

A M Surgical Inc

Abstract

An endoscopic surgical blade is disclosed. The blade is of a hook design, having an upper cutting surface located on the trailing edge of an arm and a lower cutting surface on the upper edge of the main body of the blade. The blade is part of an endoscopic knife assembly which also contains a knife tube and alignment ring. The endoscopic knife assembly is for use in endoscopic surgery by insertion of the assembly through a slotted cannula. The knife tube is hollow and allows the insertion of an endoscope for viewing of the surgical procedure. A method for a performing an operative procedure on a target tissue in a subject using an endoscopic knife assembly having a hook blade is also described.

Core Innovation

The invention is directed to a hook blade for an endoscopic surgical assembly comprising the blade and a tube marked with gradations showing distance. The blade includes an arm having a forward edge that is a non-cutting surface, a trailing edge, and an upper cutting surface located on the trailing edge, and a main body having a lower cutting surface located on an upper edge of a distal section.

The distal section angles downward from a proximate section of the main body, and the arm protrudes from the distal section to form a hook angle. The blade geometry defines a crotch where the upper cutting surface and the lower cutting surface meet to form a cutting angle between the two cutting surfaces. A notch is formed on the lower edge, and the notch is on an opposite side of the blade from the upper cutting surface of the arm.

The lower edge that includes the notch is in direct contact with a cylindrical surface of the tube marked with the gradations. During a surgical procedure, relative positions of the gradations with respect to a location of the direct contact with the notch are visible, providing distance indication tied to blade-to-tube geometry. An endoscopic surgical assembly is also described that includes a blade and the tube marked with gradations showing distance, where the distal blade portion angles downward from a planar main body and includes a radiused top edge forming a non-cutting surface facing away from the planar main body, with upper and lower cutting edges meeting at a crotch to form a cutting angle.

Claims Coverage

The document provides two independent claims that share the core requirement of a distance-marked tube with visible gradations correlated to notch contact location. Across the independent claims, inventive features are organized around blade geometry with an angled distal portion and hook/crotch cutting geometry, a notch contacting a cylindrical surface of the gradation-marked tube, and visibility of relative gradation positions during a surgical procedure.

Across the independent claims, the inventive focus is on a hook blade/endoscopic blade geometry with an angled distal section and a crotch-based cutting angle, together with a notch that directly contacts the cylindrical surface of a tube marked with gradations. The claims further require that, during a surgical procedure, the relative position of the gradations with respect to the notch contact location is visible.

Stated Advantages

Documented Applications