Rotational tissue cutting device
Disclosed embodiments include apparatuses, systems, and methods for cutting an opening in a tissue wall. In an illustrative embodiment, an apparatus includes an inner cutting member having a first cylindrical body supporting at least one first cutting surface at a distal end. The first cutting surface faces a first rotational direction relative to an axis of the first cylindrical body and has a first cutting edge at an outer periphery of the first cylindrical body. The apparatus also includes an outer cutting member having a second cylindrical body concentrically disposed around the first cylindrical body and supporting at least one second cutting surface at the distal end. The second cutting surface faces a second rotational direction relative to the axis and has a second cutting edge at an inner periphery of the second cylindrical body. A tissue is rotatably scissorable between the first cutting edge of the inner cutting member and the second cutting edge of the outer cutting member responsive to application of the distal end of the apparatus against a tissue and counter-rotating the inner cutting member and the outer cutting member.
1. An apparatus comprising:
an inner cutting member having a first open-ended cylindrical body defining a distal opening configured to receive tissue at a distal end and supporting at least one first cutting surface, wherein the first cutting surface faces a first rotational direction relative to an axis of the first open-ended cylindrical body and has a first cutting edge extending along an outer periphery of the first open-ended cylindrical body; and
an outer cutting member having a second cylindrical body concentrically disposed around the first open-ended cylindrical body and supporting at least one second cutting surface at the distal end, wherein the second cutting surface faces a second rotational direction relative to the axis and has a second cutting edge at an inner periphery of the second cylindrical body, a tissue being rotatably scissorable between the first cutting edge of the inner cutting member and the second cutting edge of the outer cutting member responsive to application of the distal end of the apparatus against a tissue and counter-rotating the inner cutting member and the outer cutting member.
2. The apparatus of claim 1 , wherein the inner cutting member supports two or more first cutting surfaces and the outer cutting member supports two or more second cutting surfaces.
3. The apparatus of claim 2 , wherein at least one of the first cutting surfaces and the second cutting surfaces is inclined relative to the axis of the inner cutting member and the outer cutting member.
4. The apparatus of claim 3 , wherein the first cutting surfaces are inclined at an acute angle relative to the axis and the second cutting surfaces are substantially parallel with the axis.
5. The apparatus of claim 1 , wherein the inner cutting member further includes an anchor tip extending outwardly beyond the distal end of the first cutting surface and configured to pierce the tissue.
6. The apparatus of claim 5 , wherein the anchor tip includes an angled member extending forward of the first cutting surface in the first rotational direction and configured to draw the tissue toward the first cutting surface.
7. The apparatus of claim 6 , wherein the angled member includes a flattened anchoring surface facing inward from the distal end of the first cutting surface.
8. The apparatus of claim 6 , wherein the angled member has a generally helical shape.
9. The apparatus of claim 5 , wherein the anchor tip includes a concave cutting surface facing the distal end and terminating in a pointed piercing tip.
10. The apparatus of claim 1 , wherein a first proximal end of the inner cutting member and a second proximal end of the outer cutting member are each configured to be coupled to a counter-rotating drive mechanism.
11. An apparatus comprising:
an inner cutting member having a first open-ended cylindrical body defining a distal opening configured to receive tissue at a distal end and supporting at least two first cutting surfaces, wherein the first cutting surfaces face a first rotational direction relative to an axis of the first open-ended cylindrical body, each of the first cutting surfaces including:
a first cutting edge extending along a side of the first open-ended cylindrical body at an outer periphery of the first open-ended cylindrical body and inclined relative to the axis of the inner cutting member; and
an anchor tip extending outwardly beyond the distal end of the first cutting surface and configured to pierce the tissue; and
an outer cutting member having a second cylindrical body concentrically disposed around the first open-ended cylindrical body and supporting at least two second cutting surfaces at the distal end of the apparatus, wherein each of the second cutting surfaces faces a second rotational direction relative to the axis and has a second cutting edge at an inner periphery of the second cylindrical body, a tissue being pierceable by the anchor tip and being rotationally scissorable between one of the first cutting edges of the inner cutting member and one of the second cutting edges of the outer cutting member responsive to application of the distal end of the apparatus against a tissue and counter-rotating the inner cutting member and the outer cutting member.
12. The apparatus of claim 11 , wherein the first cutting surfaces are inclined at an acute angle relative to the axis and the second cutting surfaces are substantially parallel with the axis.
13. The apparatus of claim 11 , wherein the anchor tip includes an angled member extending forward of the first cutting surface in the first rotational direction and configured to draw the tissue toward the first cutting surface.
14. The apparatus of claim 13 , wherein the angled member includes a flattened anchoring surface facing inward from the distal end.
15. The apparatus of claim 13 , wherein the angled member has a generally helical shape.
16. The apparatus of claim 11 , wherein the anchor tip includes a concave cutting surface facing the distal end and ending in a pointed piercing tip.
17. The apparatus of claim 11 , wherein a first proximal end of the inner cutting member and a second proximal end of the outer cutting member are each configured to be coupled to a counter-rotating drive mechanism.