Respiratory flow sensor

Abstract

The invention relates to a respiratory flow sensor (11) comprising a flow tube (12), which has a longitudinal axis (14), a first flow tube portion (21) and a second flow tube portion (41), comprisinga flow resistor (61), which is disposed between the first flow tube portion (21) and the second flow tube portion (41) in the flow channel (13), and comprising two ports (32, 52) for extracting the pressure difference generated by the flow resistor (61). The first port (32) opens into the first flow tube portion (21) via a first connecting line and said first port is disposed at the first flow tube portion (21). The second port (52) opens into the second flow tube portion (41) via a second connecting line and said second port is disposed at the second flow tube portion (41). The ports (32, 52)each comprise a connecting line portion (33, 53), which extends substantially parallel to the longitudinal axis (14) of the flow tube (12). The openings (35, 55) of the ports (32, 52) are aligned inthe same direction. The invention further relates to a respiration adapter and a method for producing a respiratory flow sensor (11).

Description

technical field [0001] The invention relates to a respiratory flow sensor according to the preamble of claim 1 , a breathing adapter according to the preamble of claim 10 , and a method for producing a respiratory flow sensor according to claim 12 . Background technique [0002] The respiratory flow sensor, also called differential pressure flow sensor, flow measurement sensor or flow sensor, is arranged between the hose leading from the ventilator or anesthesia machine and the hose leading to the patient. [0003] A respiratory flow sensor is known in US 4,403,514 A, which comprises a flow tube with a longitudinal axis, a first flow line section and a second flow line section, the flow tube also has a flexible end area for the hose hose connection. A flow resistance is arranged in the flow line between the first flow line section and the second flow line section. In addition, radially protruding ports are provided to reduce pressure differences due to flow resistance. C...

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of this known solution is that the connecting lines arranged at the connection can become kinked, which in some cases leads to distortion of the measurement results

[0006] The disadvantage of this known solution is that not only is the connecting line formed radially from the connection to the corresponding flow pipe section, that is, flange projections protruding outwards must be provided, but at the same time, in order to ensure a tight connection, the design of the sealing material requires Take complex structural and manufacturing measures

[0008] The disadvantage of this solution is that the extension tube protrudes essentially radially from the flow sensor, so that the measuring tube arranged in it also protrudes essentially radially during use, whereby the flow sensor takes up a relatively large amount of space during use. space, so that the operation of the flow sensor is complicated for the user

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