PUMP TUBE UNIT AND ENDOSCOPE SYSTEM
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United States of America Patent
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Issued Date -
Aug 10, 2023
app pub date -
Jun 16, 2021
filing date -
Jun 29, 2020
priority date (Note) -
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Abstract
A pump tube unit according to the present invention includes a pump tube for sending and drawing liquid, an upstream-side water supply tube connected to an upstream-side end portion of the pump tube, a downstream-side water supply tube connected to a downstream-side end portion of the pump tube, and a bypass water supply tube, connected across the upstream-side water supply tube and the downstream-side water supply tube, and returns a part of the liquid flowing through the downstream-side water supply tube to flow back into the upstream-side water supply tube. The bypass water supply tube has a small-diameter portion in a predetermined range except for both end portions of the bypass water supply tube. The small-diameter portion has an inner diameter smaller than an inner diameter of other range.
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