Patent ID: 8920451
Filing Date: 2014-12-30
Classification: A61B

Abstract:
1. A fibrin removal assembly comprising a first helical coil having a first pitch and a first lumen with a first inner diameter, a hollow body having a generally tubular shape, a second lumen lined with a spiral thread forming a second inner diameter, the spiral thread having a second pitch, the second pitch being substantially the same as the first pitch, a first set of cutting elements including a first plurality of cutting elements extending from the first inner diameter inward into the first lumen and configured to cut tissue in a first circumferential direction, and a second set of cutting elements including a second plurality of cutting elements extending from the second inner diameter inward into the first lumen and configured to cut tissue in a second circumferential direction opposite the first circumferential direction, the first and second sets of cutting elements being axially arranged and oriented with respect to each other that a circumferential and axial displacement of the first helical coil relative to the hollow body along the spiral thread causes an edge of each of the cutting elements of the first plurality of cutting elements to pass an edge of one of the cutting elements of the second plurality of cutting elements closely enough to cut tissue between the first plurality of cutting elements and the second plurality of cutting elements.