Portable Measuring Facility for Determining A Medically Significant Analyte Concentration

• US 20090044604A1
• Filed: 08/15/2007
• Published: 02/19/2009
• Est. Priority Date: 08/15/2007
• Status: Abandoned Application

• Current Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Original Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Inventors: Kraemer, Peter, Ocvirk, Gregor
• Application Number:
  US11/839,240
• Publication Number:
  US 20090044604A1
• Time in Patent Office: Days
• US Class Current: 73/61.410
• CPC Class Codes: A61B 5/14528 invasively
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/1473 invasive, e.g. introduced into the body by a catheter A61B5/1482 takes precedence

Abstract

A portable measuring facility for determining the concentration of an analyte in a living body may comprise a sensor configured to determine the concentration of an analyte in a liquid, and a liquid conveying facility. The liquid conveying facility may have a liquid line configured to be connected to a probe that is implantable into tissue of the living body, a pump configured to pump the liquid from the probe through the liquid line to the sensor, and a degassing facility configured to degas the liquid pumped from the probe through the liquid line to the sensor.

Claims

1. A portable measuring facility for determining the concentration of an analyte in a living body, comprising

a sensor configured to determine the concentration of an analyte in a liquid, and

a liquid conveying facility having a liquid line configured to be connected to a probe that is implantable into tissue of the living body, a pump configured to pump the liquid from the probe through the liquid line to the sensor, and a degassing facility configured to degas the liquid pumped from the probe through the liquid line to the sensor.

2. The measuring facility of claim 1 wherein a mass of the measuring facility is less than 1 kg.

3. The measuring facility of claim 1 wherein the measuring facility is a micro-dialysis facility having a perfusion liquid line that guides perfusion liquid from a perfusion liquid reservoir into the probe.

4. The measuring facility of claim 3 wherein the probe is a micro-dialysis probe comprising a dialysis membrane through which molecules of the analyte from body fluid surrounding the probe can diffuse into the perfusion liquid,

and wherein the liquid pumped from the probe through the liquid line to the sensor is the perfusion liquid with the molecules of the analyte diffused therein.

5. The measuring facility of claim 4 wherein the degassing facility comprises an aspiration line configured to apply a negative pressure to a gas-permeable surface of the liquid line.

6. The measuring facility of claim 5 further comprising a degassing chamber connected to the aspiration line,

wherein the gas-permeable surface of the liquid line is arranged within the degassing chamber.

7. The measuring facility of claim 6 wherein a length of the degassing chamber is 5- to 20-fold an internal diameter of a section of the liquid line that is arranged within the degassing chamber.

8. The measuring facility of claim 5 wherein the pump is a peristaltic pump,

wherein a section of the liquid line comprises a first tube on which the pump acts in peristaltic fashion to generate a conveying pressure that pumps the liquid from the probe through the liquid line to the sensor,

and wherein a section of the aspiration line comprises a second tube on which the pump acts in peristaltic fashion to generate the negative pressure.

9. The measuring facility of claim 8 further comprising a degassing chamber connected to the aspiration line,

wherein the gas-permeable surface of the liquid line is arranged within the degassing chamber.

10. The measuring facility of claim 8 wherein a wall thickness of the first tube is larger than that of a section of the liquid line having the gas-permeable surface.

11. The measuring facility of claim 10 wherein the section of the liquid line having the gas-permeable surface is a hollow fiber.

12. The measuring facility of claim 10 wherein a length of the degassing chamber is 5- to 20-fold an internal diameter of a section of the liquid line that is arranged within the degassing chamber.

13. The measuring facility of claim 1 wherein the degassing facility is arranged downstream from the pump.

14. A portable measuring facility for determining the concentration of an analyte in a living body, comprising

a sensor configured to determine the concentration of an analyte that is present in a liquid, and

a liquid conveying facility having a liquid line configured to be connected to a probe that is implantable into tissue of the living body, a pump configured to pump the liquid from the probe through the liquid line to the sensor, and a degassing facility having an aspiration line configured to degas the liquid pumped from the probe through the liquid line to the sensor by applying a negative pressure to a gas-permeable surface of the liquid line.

15. The measuring facility of claim 14 further comprising a degassing chamber connected to the aspiration line,

wherein the gas-permeable surface of the liquid line is arranged within the degassing chamber.

16. The measuring facility of claim 15 wherein a length of the degassing chamber is 5- to 20-fold an internal diameter of a section of the liquid line that is arranged within the degassing chamber.

17. The measuring facility of claim 14 wherein the pump is a peristaltic pump,

wherein a section of the liquid line comprises a first tube on which the pump acts in peristaltic fashion to generate a conveying pressure that pumps the liquid from the probe through the liquid line to the sensor,

and wherein a section of the aspiration line comprises a second tube on which the pump acts in peristaltic fashion to generate the negative pressure.

18. The measuring facility of claim 17 further comprising a degassing chamber connected to the aspiration line,

wherein the gas-permeable surface of the liquid line is arranged within the degassing chamber.

19. The measuring facility of claim 17 wherein a wall thickness of the first tube is larger than that of a section of the liquid line having the gas-permeable surface.

20. The measuring facility of claim 19 wherein the section of the liquid line having the gas-permeable surface is a hollow fiber.

21. The measuring facility of claim 19 wherein a length of the degassing chamber is 5- to 20-fold an internal diameter of a section of the liquid line that is arranged within the degassing chamber.

22. The measuring facility of claim 14 wherein the degassing facility is arranged downstream from the pump.

23. The measuring facility of claim 14 wherein a mass of the measuring facility is less than 1 kg.

24. A portable measuring facility for determining the concentration of an analyte in a living body, comprising

a sensor configured to determine a concentration of an analyte in a liquid,

a probe configured to be implanted into tissue of the living body,

a peristaltic pump,

a liquid line having a section defining a first tube on which the pump acts in peristaltic fashion to generate a conveying pressure in the liquid line to convey the liquid from the probe through the liquid line to the sensor, and

an aspiration line having a section comprising a second tube on which the pump acts in peristaltic fashion to generate a negative pressure that is applied to a gas-permeable surface of the liquid line.

25. The measuring facility of claim 24 further comprising a degassing chamber connected to the aspiration line,

wherein the gas-permeable surface of the liquid line is arranged within the degassing chamber.

26. The measuring facility of claim 25 wherein the degassing facility is arranged downstream from the pump.

27. The measuring facility of claim 25 wherein a mass of the measuring facility is less than 1 kg.

28. The measuring facility of claim 25 wherein the measuring facility is a micro-dialysis facility having a perfusion liquid line that guides perfusion liquid from a perfusion liquid reservoir into the probe,

wherein the probe is a micro-dialysis probe comprising a dialysis membrane through which molecules of the analyte from body fluid surrounding the probe can diffuse into the perfusion liquid,

and wherein the liquid being conveyed is the perfusion liquid with the molecules of the analyte diffused therein.