Patent ID: 9211113
Filing Date: 2015-12-15
Classification: A61B

Abstract:
1. A biopsy needle for collecting a tissue specimen comprising: a handle including a handle body that defines a hollow interior that includes a hollow inner housing member that is disposed within the hollow interior and has an open first end and a closed second end; a cannula assembly including an inner cannula and an outer cannula that surrounds at least a portion of the inner cannula, the inner cannula having a snarecoil coil at a distal end that is attached to the outer cannula and wherein the closed second end of the inner housing member limits travel of a proximal end of the inner cannula, the inner cannula and outer cannula being coupled to one another so that the two cannulas move together in a longitudinal direction, at least a portion of the cannula assembly being received in the handle body with at least a proximal end portion of the inner cannula being received within the hollow inner housing member; a first biasing element that is coupled to the cannula assembly for applying a force thereto when stored energy of the first biasing element is released to cause forward projection of the cannula assembly, wherein a first end of the first biasing element is directly connected to a proximal wall of the handle body which is disposed proximal to the closed second end of the hollow inner housing member and a second end is attached to a flange that is integrally connected to the inner cannula, the first biasing element being disposed around an exterior of the hollow inner housing member; a first mechanism having a first component associated with a proximal end of the inner cannula that is received within the inner housing member and a second component associated with the hollow inner housing member to cause controlled rotation of the inner cannula relative to the outer cannula after the cannula assembly is projected a predetermined distance; and an actuator operably coupled to the cannula assembly to selectively release the energy stored in the first biasing element and cause the forward projection of the cannula assembly and the subsequent rotation of the inner cannula relative to the outer cannula to cause activation of the snarecoil.