US 12,484,769 B2
Pump tube unit and endoscope system
Koji Karasawa, Tochigi (JP)
Assigned to FORTE GROW MEDICAL CO., LTD., Tochigi (JP); and ORT MEDICAL CO., LTD., Kanagawa (JP)
Appl. No. 18/003,341
Filed by FORTE GROW MEDICAL CO., LTD., Tochigi (JP); and ORT MEDICAL CO., LTD., Kanagawa (JP)
PCT Filed Jun. 16, 2021, PCT No. PCT/JP2021/022810
§ 371(c)(1), (2) Date Dec. 27, 2022,
PCT Pub. No. WO2022/004380, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 2020-111716 (JP), filed on Jun. 29, 2020.
Prior Publication US 2023/0248226 A1, Aug. 10, 2023
Int. Cl. A61B 1/00 (2006.01); A61B 1/015 (2006.01); A61B 1/018 (2006.01)
CPC A61B 1/015 (2013.01) [A61B 1/018 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A pump tube unit, comprising:
a pump tube installed in a pump including a rotary body and a plurality of pressing portions arranged on an outer peripheral edge portion of the rotary body at predetermined angular intervals, the pump tube being configured to repeat an operation of sending a liquid held inside to a downstream side and drawing in a liquid from an upstream side when being pressed by any one of the plurality of pressing portions in turn during rotation of the rotary body;
an upstream-side water supply tube connected to an upstream-side end portion of the pump tube to allow the liquid drawn into the pump tube to flow therethrough;
a downstream-side water supply tube connected to a downstream-side end portion of the pump tube to allow the liquid sent from the pump tube to flow therethrough; and
a bypass water supply tube connected across the upstream-side water supply tube and the downstream-side water supply tube, the bypass water supply tube being configured to cause a part of the liquid flowing through the downstream-side water supply tube to flow back into the upstream-side water supply tube,
wherein the bypass water supply tube includes a small-diameter portion extending over a predetermined range except for both end portions of the bypass water supply tube in a longitudinal direction of the bypass water supply tube, the small-diameter portion having an inner diameter smaller than an inner diameter of a range of the bypass water supply tube except for the predetermined range,
wherein the bypass water supply tube includes:
a first water supply tube to be connected to the downstream-side water supply tube;
a second water supply tube having the same diameter as a diameter of the first water supply tube, the second water supply tube to be connected to the upstream-side water supply tube; and
a third water supply tube arranged between the first water supply tube and the second water supply tube, the third water supply tube having an inner diameter smaller than an inner diameter of the first water supply tube and an inner diameter of the second water supply tube,
wherein a clamp is arranged in the first water supply tube, and being configured to switch between a state in which the first water supply tube is closed and a state in which the first water supply tube is open, and
wherein the clamp maintains the first water supply tube in an open state when the downstream-side water supply tube is connected to a secondary water supply channel of an endoscope and maintains the first water supply tube in a closed state when the downstream-side water supply tube is connected to a forceps channel of the endoscope.