Patent ID: 9033707
Filing Date: 2015-05-19
Classification: A61B,A61C,A61F,A61L

Abstract:
1. A tool for creating a perforation or cavity in a bone or bone structure in contact with a sinus membrane, said tool comprising: a drill having a first end for connection with a handpiece, a second free end, and a channel extending along the axis of said drill from said first end to said second free end, said channel including at least one opening at the drill second free end that is at an angle to the longitudinal axis of the drill for supplying a liquid under pressure to said second free end, wherein the liquid is a solution of water containing from 0.5% by weight to 3% by weight of NaCl, said tool further comprising an insert configured to be inserted into said channel of said drill, said insert having a first end connected to a source of said liquid under pressure, thus enabling supply of said liquid to said channel, and defining a first flow path for said liquid to flow through said insert to said channel and a second end located inside the channel remote from said at least one opening at the second free end of the drill, wherein an outer diameter of said insert is smaller than an inner diameter of said channel to create an open space between said insert and said channel, said open space having an exit defining a second flow path for a backflow of said liquid to flow through said open space in a direction opposite to a direction of a flow of said liquid flowing along said first flow path, and wherein said insert and said at least one opening at the second free end define a third flow path for said liquid to flow from said insert to said at least one opening at the second free end; wherein said first, said second, and said third flow paths are configured such that, while drilling the bone or bone structure with the drill, said liquid flowing along said first flow path is split inside said channel at a split location between the second end of the insert and the at least one opening at the second free end of the drill into said liquid flowing along said second flow path and said liquid flowing along said third flow path, so that said liquid is partially flowable into and through the bone or bone structure toward the sinus membrane, thereby enabling performance of a progressive detachment of the sinus membrane when the drill is close to the sinus membrane while still being inside the bone or bone structure, and before completely piercing the bone or bone structure.