EXTRACORPOREAL BLOOD GAS EXCHANGE DEVICE

• US 20190321534A1
• Filed: 12/12/2017
• Published: 10/24/2019
• Est. Priority Date: 12/19/2016
• Status: Active Grant

• Current Assignee: Dragerwerk AG & Company KGaA (FPS Vermögensverwaltung GmbH)
• Original Assignee: Dragerwerk AG & Company KGaA (FPS Vermögensverwaltung GmbH)
• Inventors: VON BLUMENTHAL, Tilman
• Granted Patent: US 11,547,785 B2
• Time in Patent Office: Days
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: A61B 5/14557 specially adapted to extracorporeal circuits
• CPC Class Codes: A61M 1/1698 Blood oxygenators with or without heat-exchangers intracorporal A61M1/1678; manufacturing of membranes therefor B01D67/00; semi-permeable membranes for separation processes characterised by their properties B01D69/00; semi-permeable membranes characterised by their material B01D71/00
• CPC Class Codes: A61M 2205/3306 Optical measuring means
• CPC Class Codes: A61M 2205/3313 used specific wavelengths
• CPC Class Codes: G01N 33/4925 measuring blood gas content, e.g. O2, CO2 , HCO3

Abstract

An extracorporeal blood gas exchange device has a bloodstream area for guiding a bloodstream, a gas-carrying area for guiding a gas flow, and a membrane, which forms a gas-liquid barrier between the bloodstream and the gas flow, and which further makes possible the transfer of carbon dioxide of the bloodstream into the gas flow. The device further has at least one measuring cuvette, which is separated from the bloodstream area at least partially by the membrane, so that carbon dioxide of the bloodstream can pass over into the measuring cuvette. The device has an optical measuring unit, which is configured to measure a carbon dioxide partial pressure present in the measuring cuvette.

Claims

1. An extracorporeal blood gas exchange device comprising:

a bloodstream area for guiding a bloodstream;

a gas-carrying area for guiding a gas flow;

a membrane, which forms a gas-liquid barrier between the bloodstream and the gas flow and which further makes possible a transfer of carbon dioxide (K) of the bloodstream into the gas flow;

at least one measuring cuvette, which is separated from the bloodstream area by the membrane at least partially, so that carbon dioxide of the bloodstream can pass over into the measuring cuvette; and

an optical measuring unit, which is configured to measure a carbon dioxide partial pressure present in the measuring cuvette.

2. A device in accordance with claim 1, wherein the measuring cuvette comprises a cuvette wall providing a gas-tight closure against the gas-carrying area.

3. A device in accordance with claim 1, wherein the optical measuring unit is configured to emit optical radiation into the measuring cuvette and to detect a portion of the optical radiation transmitted though the measuring cuvette.

4. A device in accordance with claim 3, wherein the optical radiation is an infrared radiation.

5. A device in accordance with claim 3, wherein the measuring cuvette comprises:

a first optical window for admitting the optical radiation into the measuring cuvette; and

a second optical window for allowing the optical radiation to exit from the measuring cuvette.

6. A device in accordance with claim 1, wherein:

the device has an inflow side, on which the bloodstream flows into the device, as well as an outflow side, on which the bloodstream flows out of the device; and

the measuring cuvette is located at or adjacent to a location of the membrane that corresponds to the inflow side.

7. A device in accordance with claim 1, wherein:

the device has an inflow side, on which the bloodstream flows into the device, as well as an outflow side, on which the bloodstream flows out of the device, and

the measuring cuvette is located at or adjacent to a location of the membrane that corresponds to the outflow side.

8. A device in accordance with claim 1, wherein the membrane is formed by a plurality of hollow fiber arrays.

9. A device in accordance with claim 8, wherein:

the device has an inflow side, on which the bloodstream flows into the device, as well as an outflow side, on which the bloodstream flows out of the device; and

the measuring cuvette is formed by a hollow fiber array, which is located adjacent to the inflow side.

10. A device in accordance with claim 8, wherein:

the device has an inflow side, on which the bloodstream flows into the device, as well as an outflow side, on which the bloodstream flows out of the device; and

the measuring cuvette is formed by such a hollow fiber array, which is located close to the outflow side.