CN-116251270-B - Airway adapter with liquid containment path

Abstract

An airway adapter providing a measurement chamber for gas measurement by a mainstream gas analyzer includes a body having a first end and a second end and configured to be connected into a ventilation circuit that delivers ventilation gas into and out of a patient. The body forms a primary path including the measurement chamber and configured to allow ventilation gas to pass between the first end and the second end, and at least one secondary path separate from the primary path and located on an outer periphery of the primary path. The at least one auxiliary path is configured to contain a liquid remote from the measurement chamber.

Inventors

• M. H.J. Hitara

Assignees

• 通用电气精准医疗有限责任公司

Dates

Publication Date

20260508

Application Date

20221205

Priority Date

20211210

Claims (18)

1. 1. An airway adapter providing a measurement chamber for gas measurement by a mainstream gas analyzer, the airway adapter comprising: a body having a first end and a second end and configured to be connected into a ventilation circuit that delivers ventilation gas into and out of a patient; a primary path including the measurement chamber and configured to allow the ventilation gas to pass between the first end and the second end; At least one auxiliary path separate from and on the outer periphery of the main path, and Wherein the at least one auxiliary path is configured to contain a liquid remote from the measurement chamber, Wherein the at least one auxiliary path has a narrowing section comprising a portion of the length of the auxiliary path, the narrowing section configured to limit the flow rate therethrough.
2. 2. The airway adapter of claim 1, wherein the at least one auxiliary pathway is on a bottom side of the body below the primary pathway.
3. 3. The airway adapter according to claim 1, wherein the at least one auxiliary path is separated from the primary path along at least a length of a central portion of the body.
4. 4. An airway adapter according to claim 1, wherein the at least one auxiliary path extends parallel to the primary path.
5. 5. An airway adapter according to claim 1, wherein the narrowing section is in a central portion of the body.
6. 6. The airway adapter according to claim 5, wherein the narrowing section is configured to limit the flow rate through the at least one auxiliary path such that the flow rate does not exceed 50% of the flow rate through the primary path.
7. 7. The airway adapter of claim 6, wherein the flow rate through the at least one auxiliary path is no more than 40% of the flow rate through the primary path.
8. 8. The airway adapter of claim 7, wherein the flow rate through the at least one auxiliary path is no more than 20% of the flow rate through the primary path.
9. 9. The airway adapter according to claim 1, further comprising at least two auxiliary paths, wherein a total flow rate through the at least two auxiliary paths does not exceed 20% of the flow rate through the primary path.
10. 10. The airway adapter of claim 1, which is a neonatal adapter, and wherein the main path has a volume of no more than 2.5mL.
11. 11. The airway adapter according to claim 10, wherein the at least one auxiliary path has a narrowing section comprising a portion of the length of the auxiliary path, the narrowing section being configured to restrict the flow rate through the at least one auxiliary path to no more than 40% of the flow rate through the primary path.
12. 12. A neonatal airway adapter providing a measurement chamber for gas measurement within a neonatal ventilation circuit by a mainstream gas analyzer, the airway adapter comprising: A body having a first end and a second end and configured to be connected into the neonatal ventilation circuit that delivers ventilation gas into and out of a neonatal patient; a primary path including the measurement chamber and configured to allow the ventilation gas to pass between the first end and the second end; at least one auxiliary path separate from and on an outer periphery of the main path, wherein the auxiliary path is configured such that a flow rate through the auxiliary path is less than a flow rate through the main path, and Wherein the at least one auxiliary path is configured to contain a liquid remote from the measurement chamber, Wherein the at least one auxiliary path has a narrowing section comprising a portion of the length of the auxiliary path, the narrowing section being configured to achieve a restriction of flow rate.
13. 13. The neonatal airway adapter of claim 12, wherein the at least one auxiliary path is connected between the first end and the second end and is split along at least a length of a central portion of the body.
14. 14. The neonatal airway adapter of claim 12, wherein the at least one auxiliary path extends in parallel to the primary path between the first end and the second end.
15. 15. The neonatal airway adapter of claim 12, wherein the at least one auxiliary pathway is on a bottom side of the body below the primary pathway.
16. 16. The neonatal airway adapter of claim 12, wherein the narrowing section is in a central portion of the body.
17. 17. The neonatal airway adapter of claim 12, further comprising at least two auxiliary pathways.
18. 18. The neonatal airway adapter of claim 17, wherein a total flow rate through the at least two auxiliary paths is no more than 40% of a flow rate through the primary path.

Description

Airway adapter with liquid containment path Background The present disclosure relates generally to respiratory gas sensor systems that measure one or more respiratory gas components in a respiratory circuit of a patient, and more particularly to respiratory gas sensor systems having a gas analyzer that includes a color detection system for component identification. In anesthesia and intensive care, the condition of a patient is typically monitored by analyzing the content of inhaled and exhaled gases of the patient. For this purpose, a small portion of the breathing gas is fed to the gas analyzer, or the gas analyzer is directly connected to the breathing circuit. In non-dispersive infrared (NDIR) gas analyzers, the measurement is based on the absorption of Infrared (IR) radiation in a gas sample. The radiation source directs a beam of infrared radiation through the measurement chamber to a radiation detector whose output signal depends on the absorption intensity of the radiation in the sample gas. The radiation source typically includes electrically heated filaments or surface regions and radiation collection optics, and emits radiation in the spectral region. A gas sample to be analyzed is transported through the measurement chamber. For example, the measurement chamber may be a tubular space with an inlet and an outlet for the sample gas and provided with a window that is transparent at the measurement IR wavelength and allows the IR wavelength to be transmitted through the chamber. As the gas sample passes through the measurement chamber, radiation is absorbed by the gas sample, and thus the amount of measured IR wavelength transmitted through the chamber (i.e., from one window to another window) is indicative of the amount of a particular gas component in the gas sample. The radiation detector generates an electrical signal that depends on the radiation power falling on its sensitive area. The type of detector in a gas analyzer depends on its measurement wavelength. For measurements in a broad spectral range, a thermal detector is convenient because its sensitivity depends only on the efficiency of the conversion of radiation into heat. In order to sensitize the output signal of the detector to a specific gas component, the wavelength band of the radiation reaching the detector is selected such that the gas component absorbs the radiation therein. The selection is made using an optical bandpass filter, for example, the bandwidth of which may be 1% to 2% of the center wavelength. The gas analyzer may be configured to measure different gas compositions. The absorption of the gas sample at a wavelength band selected to match the absorption spectrum of the gas component of interest is measured. By using one radiation detector and by continuously changing the optical bandpass filter in the optical path, measurement of more than one gas component can be achieved. Several radiation detectors in combination with corresponding band pass filters may also be used. The absorption wavelength regions of different breathing gases are widely spaced. Carbon dioxide and nitrous oxide can be measured between 3900nm and 4600nm, while anesthetic agents absorb in the 8000nm to 10,000nm region. Disclosure of Invention This summary is provided to introduce a selection of concepts that are further described below in the detailed description. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used as an aid in limiting the scope of the claimed subject matter. In one embodiment, an airway adapter providing a measurement chamber for gas measurement by a mainstream gas analyzer includes a body having a first end and a second end and configured to be connected into a ventilation circuit that delivers ventilation gas into and out of a patient. The body forms a primary path including the measurement chamber and configured to allow ventilation gas to pass between the first end and the second end, and at least one secondary path separate from the primary path and located on an outer periphery of the primary path. The at least one auxiliary path is configured to contain a liquid remote from the measurement chamber. One embodiment of a neonatal airway adapter providing a measurement chamber for taking gas measurements within a neonatal ventilation circuit by a mainstream gas analyzer has a body with a first end and a second end and configured to connect into a neonatal ventilation circuit that delivers ventilation gas into and out of a neonatal patient. The body forms a primary path including the measurement chamber and configured to allow ventilation gas to pass between the first end and the second end, and at least one secondary path located on an outer periphery of the primary path. The at least one auxiliary path is separate from the primary path and is configured such that a flow rate through the auxiliary path is less than a flow rate through the primary path.