Automated, selectable, soft tissue excision biopsy devices and methods
An excisional biopsy and delivery device may comprise one or more rotating, penetrating and cutting rod elements. The rod elements may be configured to advance from a stored and confined first position and rotate about an axis, while being simultaneously revolved about a central axis. The rod elements may then assume a second released and expanded configuration that is operative to cut around and surround target tissue. In this manner, the rod elements are operative to move through the surrounding tissue to create a volume of revolution and to sever and capture the target tissue contained within the volume of revolution from the surrounding tissue. The severed and captured volume of revolution containing the target issue may then be removed.
1. A method, comprising:
advancing a tube toward a target within tissue such that a longitudinal axis of the tube intersects the target;
stopping the advancement of the tube before a distal end thereof reaches the target;
deploying a plurality of curved rod elements out of the distal end of the tube such that each of the plurality of curved rod elements rotates about an axis of rotation that is different from an axis of rotation of each of the others of the plurality of curved rod elements, each of the plurality of rotating curved rod elements comprising a sharpened edge configured to cut tissue during rotation thereof;
rotating the plurality of deployed curved rod elements and cutting a volume of tissue using the sharpened edge of each of the plurality of curved rod members; and
capturing the target within the volume of tissue cut by the plurality of curved rod elements without breaching the target.
2. The method of claim 1 , wherein deploying and capturing comprises keeping the target intact.
3. The method of claim 1 , wherein deploying comprising causing distal ends of the curved rod elements to describe a spiral path around the target.
4. The method of claim 1 , wherein at least one of deploying and capturing comprises causing the curved rod elements to define a spheroid of revolution of tissue in which the target is at a center thereof.
5. The method of claim 4 , wherein an axis of revolution of the spheroid of revolution is aligned with the longitudinal axis of the tube.
6. The method of claim 1 , further comprising
parting off the tissue volume delineated by the plurality of curved rod elements from surrounding tissue.
7. The method of claim 6 , further comprising collecting the parted-off tissue volume.
8. The method of claim 1 , wherein a central tube is disposed within the tube along the longitudinal axis thereof, wherein a locating wire is disposed within the central tube and wherein the method further comprises:
deploying the locating wire out of the central tube toward the target.
9. The method of claim 8 , further comprising advancing the deployed locating wire at least until it reaches the target.
10. A method, comprising:
advancing a tube through tissue, the tube comprising a distal end and a proximal end;
deploying a plurality of curved rod members within the tissue from the distal end of the tube, each of the plurality of curved rod members comprising a sharpened edge configured to cut tissue;
rotating the plurality of deployed curved rod members and cutting a spheroid of revolution of tissue using the sharpened edge of each of the plurality of curved rod members, the spheroid of revolution being distally-located relative to the distal end of the tube; and
removing the cut spheroid of revolution from surrounding tissue.
11. The method of claim 10 , wherein rotating each of the plurality of curved rod members is carried out such that each of the plurality of curved rod members rotates about a separate and different axis of rotation.
12. The method of claim 10 , wherein deploying comprises causing distal ends of the plurality of curved rod members to describe a spiral path around the target.
13. The method of claim 10 , wherein an axis of revolution of the spheroid of revolution is aligned with a longitudinal axis of the tube.
14. The method of claim 10 , wherein the spheroid of revolution is wider than a diameter of the tube.