US 12,419,620 B2
Core-severing cannula for biopsy devices
Matthew Mobley, Athens, TX (US); Venkata Ramana Hogirala, Athens, TX (US); and Joe Cotten, Athens, TX (US)
Assigned to Argon Medical Devices, Inc., Athens, TX (US)
Filed by Argon Medical Devices, Inc., Athens, TX (US)
Filed on Aug. 10, 2020, as Appl. No. 16/989,665.
Claims priority of provisional application 62/890,512, filed on Aug. 22, 2019.
Prior Publication US 2021/0052259 A1, Feb. 25, 2021
Int. Cl. A61B 10/02 (2006.01); A61B 17/34 (2006.01); B29C 67/24 (2006.01)
CPC A61B 10/0275 (2013.01) [A61B 10/0266 (2013.01); A61B 17/3421 (2013.01); B29C 67/24 (2013.01); A61B 2010/0208 (2013.01); B29C 2791/009 (2013.01)] 15 Claims
OG exemplary drawing
 
12. A biopsy device comprising:
a handle portion defining a longitudinal axis;
an inner cannula having at its distal end at least one cutting edge;
an outer cannula slidably disposed around and coaxially to the inner cannula and having at its distal end a plurality of flexible fingers having first and second side edges that intersect at a distal end to form a fingertip which is asymmetrical with respect to a radial axis of the outer cannula, the flexible fingers capable of moving between a closed position and an open position when the inner cannula is inserted through the flexible fingers, wherein in the closed position the first side edges of each flexible finger is substantially parallel to the second side edge of an adjacent flexible finger, and wherein in the open position the fingertips are positioned outside the exterior surface of the inner cannula, wherein the first and second side edges of the flexible fingers are asymmetrical with respect to a longitudinal axis of the outer cannula, and the flexible fingers are capable of moving between the closed position and the open position such that the first and second side edges of the flexible fingers slide relative to one another in axial and radial direction as the flexible fingers close upon retraction of the inner cannula from the flexible fingers;
wherein the handle portion further comprises a two-stage carriage element, the two-stage carriage element having a flexible abutment, the inner cannula being connected at a proximal end to a first stage of the two-stage carriage element, and the outer cannula being connected at a proximal end to a second stage of the two-stage carriage element;
a catch overlapping at least a portion of the abutment in a longitudinal direction;
a first trigger disposed in the housing and movable longitudinally within the housing and contacting a portion of the flexible abutment wherein longitudinal movement of the first trigger causes a first contact force to be applied to the abutment;
a second trigger disposed in the housing and movable transversely within the housing and contacting a portion of the flexible abutment wherein transverse movement of the second trigger causes a second contact force to be applied to the abutment; and
wherein the abutment is configured to flex away from the catch when forced by either the first or second contact force, such that the catch does not overlap a portion of the abutment and the first and second stages are biased distally together to a predetermined distance whereupon movement of the first stage is arrested, and wherein after the first stage is arrested, the second stage is further biased distally to a predetermined depth whereupon movement of the second stage is arrested.