Device for Cutting Tissue

• US 20140163590A1
• Filed: 06/13/2013
• Published: 06/12/2014
• Est. Priority Date: 12/02/2009
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Zhang, Zhiyong, Rangwala, Hussain S., VanPelt, Robert Wayne Jr., Guggenheimer, Ethan Andrew, Whealon, William Joseph, Moberg, John Robert
• Granted Patent: US 9,687,267 B2
• Time in Patent Office: Days
• US Class Current: 606/159
• CPC Class Codes: A61B 17/320758 with a rotating cutting instrument, e.g. motor driven A61B17/320725, A61B17/32075 and A61B17/320783 take precedence; for removing intra-ocular material A61F9/00763; endoscopic rotatable cutting instruments A61B17/32002
• CPC Class Codes: A61B 17/320783 through side-hole, e.g. sliding or rotating cutter inside catheter
• CPC Class Codes: A61B 2017/320775 Morcellators, impeller or propeller like means
• CPC Class Codes: A61B 2017/320791 with cutter extending outside the cutting window

Abstract

A catheter which includes a cutting element having one or more raised elements is provided. The cutting element has a cup-shaped surface at the distal end that may be smooth and continuous except for the raised elements. The raised elements have a surface that tends to direct cut particles of material towards one or more of the axis of rotation of the cutting element, the catheter axis, or a particle collection chamber. In further aspects of the invention, a cutting element oscillates in a direction roughly parallel to the axis of rotation of the cutting element.

Claims

1-47. -47. (canceled)

48. An atherectomy catheter comprising:

a rotatable shaft; and

a cutting element coupled to the rotatable shaft for rotating the cutting element about an axis of rotation, the cutting element having an annular cutting edge and a raised element radially inward of the annular cutting edge, the raised element having a raised-element cutting edge, the raised-element cutting edge having a length extending generally radially inward from adjacent the annular cutting edge, wherein the raised-element cutting edge is curved along its length.

49. The atherectomy catheter of claim 48, wherein the raised element is configured to direct cut particles of material toward the axis of rotation of the cutting element.

50. The atherectomy catheter of claim 48, wherein the annular cutting edge is at a radially outer edge of the cutting element.

51. The atherectomy catheter of claim 48, wherein the cutting element has an interior surface, the raised element comprises first, second and third walls extending outwardly from the interior surface of the cutting element, the raised element having a distal wall extending between distal edges of the first, second and third walls, wherein the raised-element cutting edge is formed at an intersection of the distal wall and the first wall.

52. The atherectomy catheter of claim 48, wherein the cutting element has proximal and distal ends, wherein the raised element is recessed proximally from the annular cutting edge by a longitudinal distance.

53. The atherectomy catheter of claim 51, wherein the first wall curves from a relatively tangential angle with the annular cutting edge at a radially outer edge of the cutting element to an angle that is more orthogonal to the radially outer edge of the cutting element closer to the axis of rotation of the cutting element.

54. The atherectomy catheter of claim 53, wherein the distal wall extends from the raised-element cutting edge to a second edge, the distal wall forming an angle of less than 90 degrees with respect to the axis of rotation of the cutting element.

55. The atherectomy catheter of claim 54, wherein the curved raised-element cutting edge is more distal than the second edge.

56. The atherectomy catheter of claim 55, wherein a minimum radial distance between the raised-element cutting edge and the annular cutting edge of the cutting element is less than a minimum radial distance between the second edge and the annular cutting edge of the cutting element.

57. The atherectomy catheter of claim 54, wherein an included angle between the first wall and the distal wall is an obtuse angle.

58. The atherectomy catheter of claim 51, wherein the distal wall of the raised element is recessed proximally from the annular cutting edge by a longitudinal distance.

59. The atherectomy catheter of claim 58, wherein the distal wall of the raised element is recessed proximally from the annular cutting edge by a longitudinal distance of 0.0010 to 0.0050 inch (0.0025 to 0.0127 cm).

60. The atherectomy catheter of claim 51, wherein the first wall is shaped to direct the cut particles of material towards the axis of rotation of the cutting element.

61. The atherectomy catheter of claim 60, wherein the first wall forms an acute angle with the interior surface to form an undercut.

62. The atherectomy catheter of claim 51, wherein the interior surface comprises a cup-shaped surface of the cutting element, the cup-shaped surface being smooth and uninterrupted throughout at least 300 degrees when viewed along the axis of rotation of the cutting element.

63. The atherectomy catheter of claim 62, wherein the cup-shaped surface of the cutting element is smooth and uninterrupted for at least 90% of the surface area of the cutting element when viewed along the axis of rotation of the cutting element.

64. The atherectomy catheter of claim 62, wherein the cup-shaped surface of the cutting element has an outer radius when viewed along the axis of rotation of the cutting element, the cup-shaped surface being continuous and uninterrupted from the axis of rotation to at least half the distance to the outer radius.

65. The atherectomy catheter of claim 62 wherein the cup-shaped surface of the cutting element has a surface area, wherein the raised element comprises a plurality of raised elements, the plurality of raised elements altogether occupying less than 5% of the surface area of the cup-shaped surface when viewed along the axis of rotation of the cutting element.

66. The atherectomy catheter of claim 48, wherein the raised element comprises a plurality of raised elements, the plurality of raised elements being 2, 3, 4, 6, or 8 raised elements.

67. The atherectomy catheter of claim 48 further comprising an elongate body, wherein the shaft is coupled to the body.