Patent ID: 11872338
Assignee: NIKKISO COMPANY LIMITED
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. An air trap chamber comprising:
a chamber body that has a substantially cylindrical shape and has an upstream end defined with respect to a central axis and covered with a top wall having an inlet, and a downstream end defined with respect to the central axis and having an outlet; and
an inlet pipe that extends from the inlet into the chamber body, the inlet pipe including an ejection port, wherein
the ejection port is an opening at an end of the inlet pipe and is provided at an inner circumference surface of the chamber body,
the ejection port faces in a circumferential direction of the chamber body,
the inner circumference surface of the chamber body extends, in a spiral shape in the circumferential direction, from an ejection point where the ejection port is located to a connection point where an outer circumferential surface of the inlet pipe surrounding the ejection port is coupled to the inner circumference surface of the chamber body, and a first distance connecting the ejection point and the central axis of the chamber body on a plane perpendicular to the central axis of the chamber body is longer than a second distance connecting the connection point and the central axis of the chamber body on the plane, and
a connection point angle that is formed between a tangent line of the outer circumferential surface of the inlet pipe and a tangent line of the inner circumference surface of the chamber body at the connection point and straddles the outer circumferential surface of the inlet pipe is 90° or less.