US Patent No. 11,109,890


Patent No. 11,109,890
Issue Date September 07, 2021
Title Vertebral Body Access Cannula With Enhanced Bending Stiffness
Inventorship Calin Druma, San Jose, CA (US)
Samuel Bolosan, San Jose, CA (US)
Hester Chan, Sunnyvale, CA (US)
Assignee KYPHON SARL, Neuchatel (CH)

Claim of US Patent No. 11,109,890

1. A cannula for kyphoplasty, the cannula comprising:a shaft extending along a longitudinal axis between opposite first and second end surfaces, the shaft comprising an inner surface defining a lumen, the shaft comprising a first opening that extends through the first end surface and a second opening that extends through the second end surface; and
a scoop comprising opposite first and second side walls each extending from the second end surface, the first side wall including a first top surface, the second side wall including a second top surface, the top surfaces extending parallel to one another along at least a portion of the scoop, the scoop comprising an arcuate inner surface that is continuous with the inner surface of the shaft and an opposite outer surface, the scoop having a maximum width, the maximum width being equal to a maximum width of the shaft, the scoop including a first portion, a second portion and a third portion between the first portion and the second portion, the third portion including a rib having a radius of curvature that is less than a radius of curvature of the first portion or the second portion, the rib extending parallel to the longitudinal axis and comprising a concave inner surface that is continuous with the arcuate inner surface and a convex outer surface that is continuous with the outer surface, the rib being spaced apart from the second top surface, the scoop having only one rib, a portion of the arcuate inner surface between the second end surface and the rib having a continuous radius of curvature from the first top surface to the second top surface.