Patent ID: 9486232
Filing Date: 2016-11-08
CPC Classification: A61B

Claim Text:
1. An endoscopic cutting instrument comprising: a. an outer assembly comprised of an elongate first tubular member having a proximal end configured for attachment to a first proximal hub assembly and a distal end having a first tubular shell configured thereto, wherein said first tubular shell has a first cutting aperture formed in its distal end, further wherein a central lumen extends between the proximal end of said first tubular member and the distal end of said first tubular shell; and b. an inner assembly slidably received within the central lumen of said first tubular member, wherein said inner assembly comprises an elongate second tubular member having a proximal end configured for attachment to a second proximal hub assembly and a distal end having a second tubular shell affixed thereto, wherein said second tubular shell is comprised of (i) a proximal portion having a first diameter, (ii) a mid-portion having a second diameter and (iii) a distal portion having a third diameter and a second cutting aperture formed therein; further wherein the second tubular member and said second tubular shell are relatively sized such that the diameter of the second shell distal portion is greater than the diameter of the second shell proximal portion which is greater than the diameter of the second shell mid-portion and the distal end of said second tubular member has a diameter that is less than the diameter of the second shell proximal portion; further wherein said mid-portion of said second tubular shell is covered by a first polymeric sleeve comprised of a heat shrink tubing that is heated and shrunk in place, wherein the diameter of the shell mid-portion and first polymeric sleeve together is greater than the diameter of the shell distal portion such that said first polymeric sleeve limits direct contact between said first and second tubular shells; further wherein rotation of said second tubular member relative to said first tubular member causes the respective first and second cutting apertures to align and cooperatively resect tissue within a target site that is in contact with said apertures while said first polymeric sleeve forms a lubricious bearing between said first and second tubular shells.