US 12,133,661 B2
Medical device
Taiga Nakano, Cupertino, CA (US); Junichi Kobayashi, Cupertino, CA (US); Tomonori Hatta, San Jose, CA (US); and Kosuke Nishio, Tokyo (JP)
Assigned to TERUMO KABUSHIKI KAISHA, Tokyo (JP)
Filed by TERUMO KABUSHIKI KAISHA, Tokyo (JP)
Filed on Sep. 8, 2020, as Appl. No. 17/014,083.
Application 17/014,083 is a continuation of application No. PCT/JP2019/011690, filed on Mar. 20, 2019.
Claims priority of application No. 2018-062328 (JP), filed on Mar. 28, 2018.
Prior Publication US 2020/0397466 A1, Dec. 24, 2020
Int. Cl. A61B 17/3207 (2006.01); A61B 17/22 (2006.01)
CPC A61B 17/320758 (2013.01) [A61B 2017/22079 (2013.01); A61B 2017/22082 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A medical device for removing an object inside a biological lumen, the medical device comprising:
a rotatable drive shaft that includes a lumen;
an outer tube that accommodates the drive shaft so that the drive shaft is rotatable, the outer tube including a lumen in which flows fluid during operation of the medical device;
a cutting portion fixed to a distal portion of the drive shaft to cut the object;
a hub unit disposed in a proximal portion of the drive shaft and the outer tube;
the hub unit comprising:
a first housing that includes an aspiration port for discharging the fluid to outside the medical device, the lumen of the outer tube being in fluid communication with the aspiration port so that at least some of the fluid in the lumen of the outer tube flows into the aspiration port during operation of the medical device;
a second housing that includes a liquid delivering port for delivering a liquid from outside the medical device, the lumen of the drive shaft being in communication with the liquid delivering port;
a first seal portion disposed between the second housing and the drive shaft, the rotatable drive shaft being rotatable relative to the first seal portion, the first seal portion having a first frictional with respect to the rotatable drive shaft during rotation of the rotatable drive shaft;
a second seal portion disposed between the second housing and the drive shaft, the rotatable drive shaft being rotatable relative to the second seal portion, the second seal portion having a second frictional coefficient with respect to the rotatable drive shaft during rotation of the rotatable drive shaft; and
the first frictional coefficient being lower than the second frictional coefficient, and the first seal portion being located on a distal side of the second seal portion.