US 12,376,875 B2
Endoscopic tissue resection device
Amitabh Chak, University Heights, OH (US); Jeffrey Marks, Solon, OH (US); Steve Schomisch, Strongsville, OH (US); and Ryan Juza, Broadview Heights, OH (US)
Assigned to UNIVERSITY HOSPITALS CLEVELAND MEDICAL CENTER, Cleveland, OH (US)
Appl. No. 18/261,050
Filed by UNIVERSITY HOSPITALS CLEVELAND MEDICAL CENTER, Cleveland, OH (US)
PCT Filed Jan. 20, 2022, PCT No. PCT/US2022/070261
§ 371(c)(1), (2) Date Jul. 11, 2023,
PCT Pub. No. WO2022/159956, PCT Pub. Date Jul. 28, 2022.
Claims priority of provisional application 63/140,013, filed on Jan. 21, 2021.
Prior Publication US 2024/0090912 A1, Mar. 21, 2024
Int. Cl. A61B 17/3205 (2006.01); A61B 1/00 (2006.01); A61B 17/32 (2006.01); A61B 17/00 (2006.01); A61B 17/30 (2006.01)
CPC A61B 17/320016 (2013.01) [A61B 2017/00296 (2013.01); A61B 2017/00358 (2013.01); A61B 2017/306 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An endoscopic tissue resection device configured to be attached at a distal tip of an endoscope, the device comprising a cap, a snare sheath, a snare, and a spring wire, wherein:
the cap comprises a cap body, a proximal end, a proximal opening, a distal end, and a distal opening;
the cap body defines a cavity for retraction of a tissue and has an inner perimeter;
the snare sheath comprises a proximal end, a distal end, and a snare sheath body therebetween;
the distal end of the snare sheath is affixed to the cap body along the inner perimeter of the cap body;
the snare comprises a snare actuation cable and a collapsible snare wire;
the snare actuation cable comprises a proximal end, a distal end and a snare actuation cable body therebetween, is disposed within the snare sheath, and is configured to be translated proximally and distally within the snare sheath;
the collapsible snare wire comprises a base, an apex opposite the base, and two opposing wire portions extending therebetween, is disposed within the cavity of the cap, and is reversibly collapsible from an expanded state to a collapsed state;
the base of the collapsible snare wire is attached to the snare actuation cable at or near the distal end of the snare actuation cable;
the collapsible snare wire is configured to be retracted from the cavity of the cap into the snare sheath by translating the snare actuation cable proximally within the snare sheath, the collapsible snare wire reversibly collapsing from the expanded state to the collapsed state upon retraction, and to be advanced from the snare sheath into the cavity of the cap by translating the snare actuation cable distally within the snare sheath, the collapsible snare wire reversibly expanding to the expanded state upon advancement;
the spring wire is disposed within the cavity of the cap and comprises a proximal end, a distal end, and a flexible portion therebetween;
the proximal end of the spring wire is attached to the cap body at or near the proximal end of the cap;
the distal end of the spring wire is attached to the apex of the collapsible snare wire;
the spring wire is reversibly deflectable from a resting state to a deflected state, the spring wire being in the resting state when the collapsible snare wire is disposed within the cavity of the cap and deflecting to the deflected state when the collapsible snare wire is retracted into the snare sheath;
in the resting state the spring wire orients and stabilizes the apex of the collapsible snare wire within the cap, at or near the distal opening of the cap, opposite the distal end of the snare sheath, such that the two opposing wire portions of the collapsible snare wire are positioned in apposition to the distal opening of the cap;
during deflection the spring wire bends along an arced path to the snare sheath; and
the distal end of the snare sheath is recessed into the cavity of the cap relative to the distal end of the spring wire to allow the spring wire to bend along the arced path.