US 12,453,843 B2
Dilator
Yukihiro Fuseya, Seto (JP); Hideaki Maki, Seto (JP); Daiki Takahashi, Seto (JP); Akira Sawai, Seto (JP); and Marina Tsuzuku, Seto (JP)
Assigned to ASAHI INTECC CO., LTD., Seto (JP)
Filed by ASAHI INTECC CO., LTD., Seto (JP)
Filed on Sep. 23, 2020, as Appl. No. 17/029,623.
Application 17/029,623 is a continuation of application No. PCT/JP2018/035088, filed on Sep. 21, 2018.
Prior Publication US 2021/0001098 A1, Jan. 7, 2021
Int. Cl. A61M 29/00 (2006.01); A61M 25/00 (2006.01); A61M 25/06 (2006.01)
CPC A61M 29/00 (2013.01) [A61M 25/0023 (2013.01); A61M 25/0053 (2013.01); A61M 25/005 (2013.01); A61M 2025/006 (2013.01); A61M 2025/0687 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A dilator for expanding a penetration hole in a target object, the dilator comprising:
a shaft having a hollow shape and an outer diameter that is smaller at a distal end of the shaft than at a proximal end of the shaft, wherein the shaft includes:
a first coil comprising a first wire wound into a hollow shape; and
a lumen that passes through the first coil from the distal end of the shaft to the proximal end of the shaft and that terminates at the distal end of the shaft with a distal end opening that faces a distal direction; and
a spirally-arranged protruding portion provided on an outer peripheral surface of the shaft and protruding radially outward from the shaft, the spirally-arranged protruding portion having gaps between adjacent sections of the spirally-arranged protruding portion along a longitudinal axis of the shaft,
wherein:
the outer diameter of the shaft is larger at a first position along the longitudinal axis than at a second position along the longitudinal axis, the second position being closer to the distal end of the shaft than the first position, and
an angle of inclination of the spirally-arranged protruding portion, with respect to the longitudinal axis, is larger at the second position than at the first position so that the spirally-arranged protruding portion is configured to catch the target object during rotation of the dilator in the penetration hole, wherein the angle of inclination is an acute angle.