Endoscopic surgical blade and method of use thereof

Inventors

Mirza, Ather • Mirza, Romi

Assignees

AM Surgical Inc • A M Surgical Inc

Abstract

An endoscopic surgical blade having a low-profile design, with an upper cutting surface and a lower cutting surface at its distal end and having a non-cutting radiused surface at the top end of the upper cutting surface, and the upper cutting surface and lower cutting surface meet at a crotch therebetween is disclosed. The blade is part of an endoscopic knife assembly which also contains a hollow knife tube hollow that allows the insertion of an endoscope for viewing of the surgical procedure. The endoscopic knife assembly can be used for in endoscopic surgery by insertion of the assembly through a slotted cannula. A method for a performing an operative procedure on a target tissue in a subject using the endoscopic knife assembly having a low-profile blade with an upper cutting surface and a lower cutting surface is also described.

Core Innovation

Disclosed is a low-profile endoscopic surgical blade with dual cutting surfaces at a distal crotch and a non-cutting radiused surface at a top end of the upper cutting surface. The blade includes a proximal end and a distal end, a top edge, a lower edge, an upper cutting surface, a lower cutting surface, and a horizontal mounting surface at the lower edge.

The blade further includes a notch on the lower edge that is concave, substantially crescent-shaped, and recessed from the horizontal mounting surface and into a body of the blade. The blade is sized to fit at a tip of an endoscope and is mounted on an endoscopic knife assembly with a hollow knife tube for insertion and cutting via a slotted cannula with open proximal and distal ends and an open slot extending along the length of the cannula.

An endoscope is inserted into the cannula, the blade moves in contact with the A1 pulley through the slot, the A1 pulley is operatively engaged with the blade, and the blade is advanced through the cannula to divide the A1 pulley. In the disclosed treatment context, an entry portal is established at a location proximal to the A1 pulley for uniportal endoscopic surgery, and the arrangement is configured to engage and divide the A1 pulley through the cannula while maintaining visualization.

Claims Coverage

The document contains one independent claim that covers a uniportal endoscopic method for treating trigger finger by establishing a proximal entry portal, using a slotted cannula with an inserted endoscope that carries a low-profile endoscopic knife blade, advancing the blade to engage the A1 pulley, and advancing the blade through the cannula to divide the A1 pulley. The independent claim includes 6 inventive features, with dependent claims refining blade and assembly geometry and/or adding additional visualization.

The independent claim’s coverage is centered on a proximal-to-A1 entry portal combined with a slotted cannula and an endoscope carrying a low-profile blade having a non-cutting radiused surface, a crotch between upper and lower cutting surfaces, and a concave substantially crescent-shaped recessed notch contacting a surgical tube; the blade is advanced through the cannula slot to engage and divide the A1 pulley, with dependent claims further refining blade geometry/orientation and optionally adding visualization.

Stated Advantages

Documented Applications