Device for withdrawing and for transporting a breathing gas stream

Patent metadata

Field	Value
Publication number	US-2017326326-A1
Application number	US-201515515788-A
Country	US
Kind code	A1
Filing date	Oct 5, 2015
Priority date	Oct 8, 2014
Publication date	Nov 16, 2017
Grant date	—

Abstract

A device 10 withdraws a breathing gas stream (A) from a ventilation system (B) and transports the breathing gas stream (A) to a gas analysis system (G). The device 10 has a tubular configuration with an inner side ( 41 ) and with an outer side ( 42 ) and includes two tube sections ( 11, 11 ′) and a drying stage ( 12, 14, 22 ) with an inner side ( 43, 43 ′) and with an outer side ( 44, 44 ′), and at least one liquid storage device ( 13, 21 ). The drying stage ( 12, 14, 22 ) includes a gas-tight and moisture-permeable material that transports moisture from the inner side ( 43, 43 ′) of the drying stage ( 12, 14, 22 ) through the gas-tight and moisture-permeable material to the outer side ( 42 ) of the tubular device ( 10 ). The drying stage ( 12, 14, 22 ) and/or the liquid storage device ( 13, 21 ) is arranged at least partially between the two tube sections ( 11, 11 ′).

First claim

1 . A device for withdrawing a breathing gas stream from a ventilation system and for transporting the breathing gas stream to a gas analysis system the device comprising:
a tubular configuration with an inner side and with an outer side and has comprising at least two tube sections at least one drying stage with an inner side and with an outer side; and at least one liquid storage device wherein: the drying stage comprises a gas-tight and moisture-permeable material such that moisture can be transported from the inner side of the drying stage through the gas-tight and moisture-permeable material to the outer side of the tubular configuration; and the at least one drying stage or the at least one liquid storage device is arranged at least partly between two tube sections or both the at least one drying stage and the at least one liquid storage device are arranged at least partly between two tube sections.

2 . A device in accordance with claim 1 , wherein the at least one liquid storage device is selected from among a hydrophilic porous sintered plastic material, a nonwoven, a plasma-treated granular polyethylene (PE) or a matrix of microstructured plastic particles.

3 . A device in accordance with claim 1 , wherein the at least one liquid storage device is arranged between a first tube section and a second tube section, so that the breathing gas stream passes through the device in the sequence of
a. first tube section b. liquid storage device, and c. second tube section.

4 . A device in accordance with claim 1 , wherein the at least one tube section is configured as a drying stage.

5 . A device in accordance with claim 1 , further comprising at least one additional drying stage to provide a first drying stage and at least one second drying stage wherein the liquid storage device is arranged between the first drying stage and the second drying stages such that the breathing gas stream passes through the device in the sequence of
a. first drying stage,
b. liquid storage device, and
c. second drying stage.

6 . A device in accordance with claim 1 , wherein the at least one liquid storage device has a tubular configuration.

7 . A device in accordance with claim 1 , wherein a desiccant zeolite, silica gel or the like, is applied to the outer side of at least one drying stage.

8 . A device in accordance with claim 1 , wherein the at least one liquid storage device is arranged in the at least one drying stage, so that the at least one drying stage forms a part of a drying element.

9 . A device in accordance with claim 1 , wherein the at least one liquid storage device has a wick-shaped configuration.

10 . A device in accordance with claim 1 , wherein the at least one drying stage has a membrane based on polyether imides, polyether block amides or polyurethanes.

11 . A device in accordance with claim 10 , wherein the material of which the membrane is formed is a material based on polyurethane, wherein the membrane material has:
a density of 0.5 g/cm 3 to 1.8 g/cm 3 ; or a melting range between 100° C. and 200° C.; or or a water vapor permeability greater than 500 g/m 2 per 24 hours; or any combination of a density of 0.5 g/cm 3 to 1.8 g/cm 3 and a melting range between 100° C. and 200° C. and a water vapor permeability greater than 500 g/m 2 per 24 hours.

12 . A device in accordance with claim 10 , wherein membrane is applied to a polyethylene carrier.

13 . A device in accordance with claim 1 , further comprising a hydrophobic bacteria filter, wherein the bacteria filter has a PTFE membrane with a pore size of 0.45 μm or less and with a water penetration pressure of 100 kPa or higher.

14 . A device in accordance with claim 13 , wherein the liquid storage device, and the bacteria filter form a single component.

15 . A system for monitoring the breathing gas of a patient, the system comprising a device for withdrawing a breathing gas stream from a ventilation system and for transporting the breathing gas stream to a gas analysis system, the device comprising:
a tubular configuration with an inner side and with an outer side and comprising at least two tube sections; at least one drying stage with an inner side and with an outer side; and at least one liquid storage device, wherein: the drying stage comprises a gas-tight and moisture-permeable material such that moisture can be transported from the inner side of the drying stage through the gas-tight and moisture-permeable material to the outer side of the tubular configuration; and the at least one drying stage or the at least one liquid storage device is arranged at least partly between two tube sections or both the at least one drying stage and the at least one liquid storage device are arranged at least partly between two tube sections.

16 . A system in accordance with claim 15 , wherein the at least one liquid storage device is selected from among a hydrophilic porous sintered plastic material, a nonwoven, a plasma-treated granular polyethylene (PE) or a matrix of microstructured plastic particles.

17 . A system in accordance with claim 15 , wherein the at least one liquid storage device is arranged between a first tube section and a second tube section, so that the breathing gas stream passes through the device in the sequence of
a. first tube section, b. liquid storage device, and c. second tube section.

18 . A system in accordance with claim 15 , wherein the at least one tube section is configured as a drying stage.

19 . A system in accordance with claim 15 , further comprising at least one additional drying stage to provide a first drying stage and at least one second drying stage, wherein the liquid storage device is arranged between the first drying stage and the second drying stage such that the breathing gas stream passes through the device in the sequence of
a. first drying stage, b. liquid storage device, and c. second drying stage.

20 . A device in accordance with claim 19 , wherein the desiccant comprises zeolite, silica gel or both zeolite and silica gel.

Assignees

• Draegerwerk Ag & Co Kgaa

Inventors

• Hansmann Hans-Ullrich
• Hengstenberg Andreas
• KüHN UWE
• Peter Gerd
• Riecke Michael

Classifications

• B01D2257/80

  Water · CPC title

• A61M16/0808

  Condensation traps · CPC title

• A61B5/097

  Devices for facilitating collection of breath or for directing breath into or through measuring devices · CPC title

• B01D53/268

  by diffusion · CPC title

• A61B5/082

  Evaluation by breath analysis, e.g. determination of the chemical composition of exhaled breath (A61B5/083, A61B5/091 take precedence) · CPC title