DIALYSIS SYSTEM HAVING NON-INVASIVE TEMPERATURE SENSING

• US 20090012454A1
• Filed: 07/05/2007
• Published: 01/08/2009
• Est. Priority Date: 07/05/2007
• Status: Active Grant

• Current Assignee: Baxter Healthcare SA (Baxter International Inc.), Baxter International Inc.
• Original Assignee: Baxter Healthcare SA (Baxter International Inc.), Baxter International Inc.
• Inventors: Childers, Robert W.
• Granted Patent: US 7,905,855 B2
• Time in Patent Office: Days
• US Class Current: 604/29
• CPC Class Codes: A61M 1/152 Details related to the interface between cassette and machine
• CPC Class Codes: A61M 1/1522 the interface being evacuated interfaces to enhance contact
• CPC Class Codes: A61M 1/154 with sensing means or components thereof
• CPC Class Codes: A61M 1/155 with treatment-fluid pumping means or components thereof
• CPC Class Codes: A61M 1/1561 at least one cassette surface or portion thereof being flexible, e.g. the cassette having a rigid base portion with preformed channels and being covered with a foil
• CPC Class Codes: A61M 1/1565 Details of valves
• CPC Class Codes: A61M 1/159 specially adapted for peritoneal dialysis
• CPC Class Codes: A61M 1/28 Peritoneal dialysis ; Other peritoneal treatment, e.g. oxygenation
• CPC Class Codes: A61M 1/284 Continuous flow peritoneal dialysis [CFPD]
• CPC Class Codes: A61M 1/288 Priming priming in extracorporeal blood circuits A61M1/3643
• CPC Class Codes: A61M 2205/122 using evacuated interfaces to enhance contact
• CPC Class Codes: A61M 2205/3368 Temperature
• CPC Class Codes: A61M 39/14 for connecting tubes having sealed ends needle sets A61M5/162; having valves closing automatically on disconnection of line A61M39/26
• CPC Class Codes: A61M 5/44 having means for cooling or heating the devices or media
• CPC Class Codes: G01J 5/07 Arrangements for adjusting the solid angle of collected radiation, e.g. adjusting or orienting field of view, tracking position or encoding angular position optical collimating elements G01J5/0806

Abstract

A dialysis system includes a dialysis instrument; a disposable item configured to hold a dialysis fluid and including an at least substantially opaque portion and an at least substantially clear portion; at least one non-invasive temperature sensor mounted to the dialysis instrument so as to be pointed selectively at the at least substantially clear portion and the at least substantially opaque portion; and a processor configured to calculate a temperature of the dialysis fluid within the disposable item using (i) a first temperature measurement from the at least one sensor while pointed at the at least substantially opaque portion, and (ii) a second temperature measurement from the at least one sensor pointed at the at least substantially clear portion.

Claims

1. A dialysis system comprising:

a dialysis instrument;

a disposable item configured to hold a dialysis fluid and including an at least substantially opaque portion and an at least substantially clear portion;

at least one non-invasive temperature sensor mounted to the dialysis instrument so as to be pointed selectively at the at least substantially clear portion and the at least substantially opaque portion; and

a processor configured to calculate a temperature of the dialysis fluid within the disposable item using (i) a first temperature measurement from the at least one sensor while pointed at the at least substantially opaque portion, and (ii) a second temperature measurement from the at least one sensor pointed at the at least substantially clear portion.

2. The dialysis system of claim 1, the disposable item including a disposable cassette, the sensor pointed at the cassette, at least one of the first and second temperature measurements taken while the dialysis fluid is flowing through the cassette.

3. The dialysis system of claim 1, the disposable item including a fluid tube, the sensor pointed at the tube, at least one of the first and second temperature measurements taken while the dialysis fluid is flowing through the tube.

4. The dialysis system of claim 1, the disposable item including a fluid container, at least one of the first and second temperature measurements taken while the dialysis fluid is residing in the container.

5. The dialysis system of claim 4, wherein the first and second temperature measurements are taken while the dialysis fluid is being heated within the container.

6. The dialysis system of claim 1, wherein a single temperature sensor is configured to pivot back and forth so as to be pointed at the at least substantially clear portion and the at least substantially opaque portion.

7. The dialysis system of claim 6, which includes a plurality of electromagnets positioned and arranged to hold the single temperature sensor at a back position and a forth position.

8. The dialysis system of claim 6, which includes a pneumatically retractable biasing device positioned and arranged to hold the single temperature sensor at a back position and a forth position.

9. The dialysis system of claim 6, which includes a motor configured and arranged to pivot the temperature sensor between a back position and a forth position.

10. The dialysis system of claim 1, wherein the at least one non-invasive temperature sensor is an infrared sensor.

11. The dialysis system of claim 1, which includes a first non-invasive temperature sensor pointed at the at least substantially clear portion and a second non-invasive temperature sensor pointed at the at least substantially opaque portion.

12. The dialysis system of claim 1, the at least one temperature sensor placed in a housing configured to isolate the at least one temperature sensor from an outside light.

13. The dialysis system of claim 1, wherein the processor is configured to intermittently receive the first and second temperature measurements and calculate the temperature of the dialysis fluid.

14. A dialysis system comprising:

a dialysis instrument;

a disposable item operable with the dialysis instrument and configured to hold a dialysis fluid and including an at least substantially opaque portion and an at least substantially clear portion; and

a processor configured to perform a calculation of a temperature of the dialysis fluid using a first temperature measurement taken at the at least substantially opaque portion and a second temperature measurement taken at the at least substantially clear portion.

15. The dialysis system of claim 14, wherein the at least substantially opaque portion includes one of a colored film and a colored ink applied to the disposable item.

16. The dialysis system of claim 14, which includes at least one infrared temperature sensor configured and arranged to take the first and second temperature measurements.

17. The dialysis system of claim 14, wherein the first temperature measurement is at least substantially a measurement of a wall of the disposable item at the at least substantially opaque portion, and the second temperature measurement is at least substantially a measurement of a combination of the temperature of the wall of the disposable item and a temperature of the dialysis fluid at the at least substantially clear portion.

18. The dialysis system of claim 17, wherein the calculation performed by the processor includes a subtraction of the first temperature measurement from the second temperature measurement.

19. A dialysis system comprising:

a disposable item including a wall configured to hold a dialysis fluid;

a processor configured to calculate a temperature of the dialysis fluid according to an equation

20. The dialysis system of claim 19, wherein the disposable item includes an infrared energy transmissive portion for measuring the temperature of the wall and fluid and an infrared energy non-transmissive portion for measuring the temperature of the wall.

21. The dialysis system of claim 20, wherein the infrared energy transmissive portion of the disposable item is located directly adjacent the infrared energy non-transmissive portion of the disposable item.