Method and apparatus for controlling a fluid flow rate in a fluid transport line of a medical device

• US 9,095,661 B2
• Filed: 11/29/2010
• Issued: 08/04/2015
• Est. Priority Date: 12/22/2009
• Status: Active Grant

• Current Assignee: Gambro Lundia AB (Baxter International Inc.)
• Original Assignee: Gambro Lundia AB (Baxter International Inc.)
• Inventors: Bene, Bernard
• Primary Examiner(s): Fristoe, Jr., John K
• Assistant Examiner(s): BALLMAN, CHRISTOPHER D
• Application Number:
  US13/518,588
• Publication Number:
  US 20120305090A1
• Time in Patent Office: 1,709 Days
• Field of Search: 137/392, 137/386, 137/565.3, 417/36, 417/40, 417/43, 417/124, 141198-229
• US Class Current: 1/1
• CPC Class Codes: A61M 1/1601 Control or regulation
• CPC Class Codes: A61M 1/342 Adding solutions to the blood, e.g. substitution solutions for preventing coagulation A61M1/3672
• CPC Class Codes: A61M 1/3434 with pre-dilution and post-dilution
• CPC Class Codes: A61M 1/3437 downstream of the filter, e.g. post-dilution with filtrate
• CPC Class Codes: A61M 1/3441 Substitution rate control as a function of the ultrafiltration rate
• CPC Class Codes: A61M 2205/3396 Reservoirs being alternately filled and emptied for measuring flow rate or delivered volume
• CPC Class Codes: A61M 2205/702 automatically during use
• CPC Class Codes: F17D 3/00 Arrangements for supervising or controlling working operations
• CPC Class Codes: Y10T 137/0324 With control of flow by a condition or characteristic of a fluid
• CPC Class Codes: Y10T 137/85986 Pumped fluid control

Abstract

An apparatus for controlling a fluid flow rate in a fluid transport line of a medical device, including at least a first pump, at least a chamber for collecting the fluid, at least a sensor for providing a first value correlated to the amount of fluid in the chamber, and a control device configured for receiving a second value representative of the fluid flow rate through the first pump and for correlating the second value with the first value to obtain an accuracy check of the second value. A method for controlling a fluid flow rate in a fluid transport line of a medical device including pumping a fluid, collecting the fluid in a chamber, sensing a first value correlated to the amount of fluid in the chamber, and detecting and sending a second value representative of the fluid flow rate through the first pump to a control device, sending the first value to the control device, and correlating the second value with the first value to obtain an accuracy check.

Claims

1. An apparatus for controlling a fluid flow rate in a fluid transport line of a medical device comprising:

a fluid transport line;

a first pump disposed in said fluid transport line for pumping a fluid;

a chamber disposed in said fluid transport line for collecting said fluid;

a sensor for providing a first value correlated to the amount of fluid in said chamber;

a control device configured for (i) receiving a second value representative of the fluid flow rate through the first pump (ii) converting the first value into a fluid flow rate value, and (iii) determining if the second value is accurate by comparing the fluid flow rate value to the second value; and

a second pump disposed in said fluid transport line for pumping the fluid and on a side of the fluid transport line opposite to said first pump with respect to said chamber.

2. The apparatus according to claim 1 wherein the second pump disposed in said fluid transport line for pumping fluid on a side opposite to said first pump with respect to said chamber is operatively connected to said control device.

3. The apparatus according to claim 2 wherein said second pump is operatively connected to said control device at least to provide a third value representative of the fluid flow rate through the second pump.

4. The apparatus according to claim 3 wherein said control device is configured for determining if (i) the second value is accurate or (ii) the third value is accurate by putting into relation said third value with said first value.

5. The apparatus according to claim 4 wherein said control device is further configured for regulating said first pump if the determination is that (i) said second value is inaccurate or (ii) the third value is inaccurate.

6. The apparatus according to claim 4 wherein said control device is further configured for regulating said second pump if the determination is that (i) said second value is inaccurate or (ii) the third value is inaccurate.

7. The apparatus according to claim 3 wherein said control device is configured for determining if (i) the second value is accurate or (ii) the third value is accurate by putting into relation said third value with said second value.

8. The apparatus according to claim 2 wherein said first pump is continuously activated during a predetermined treatment period and wherein a predetermined minimum threshold and a maximum threshold are provided for said first value, said second pump being activated by said control device when said minimum threshold or said maximum threshold is reached and being vice versa respectively inactivated when said maximum threshold or said minimum threshold are reached, said second pump providing, when activated, a fluid flow rate superior to the fluid flow rate of said first pump.

9. The apparatus according to claim 1, where the sensor is a weight sensor configured for controlling the weight of the fluid in said chamber or a level sensor configured for controlling the level of the fluid in said chamber.

10. An apparatus according to claim 1 wherein the sensor is a level sensor configured for controlling the level of the fluid in said chamber.

11. A method for controlling a fluid flow rate in a fluid transport line of a medical device comprising:

pumping a fluid through a fluid transport line by a first pump;

collecting said fluid passing in said transport line in a chamber;

sensing the amount of fluid in said chamber and generating a first value representative of the amount of the fluid in said chamber which is sent to a control device;

detecting and sending a second value representative of a fluid flow rate through the fluid transport line to a control device;

converting the first value into a fluid flow rate value;

determining if the second value is accurate by comparing the fluid flow rate value to the second value; and

pumping the fluid with a second pump disposed in said fluid transport line on a side opposite to said first pump with respect to said chamber.

12. The method according claim 11 further comprising regulating a fluid flow rate of said fluid on a side opposite to said first pump with respect to said chamber.

13. The method according to claim 11 further comprising:

providing a third value representative of the fluid flow rate through the second pump to a control device, and

determining if the (i) second value is accurate or (ii) the third value is accurate by correlating said third value with said first value.

14. The method according to claim 13 wherein the first pump continues pumping while said second pump is activated and in that said second pump is activated at a flow rate greater to the predetermined first fluid flow rate.

15. The method according to claim 13 further comprising repeating cyclically the steps of continuously pumping the fluid by said first pump, pumping the fluid by said second pump, or letting the fluid pass through said second pump, and stopping said second pump, or stopping the fluid flow through said second pump.

16. The method according to claim 11 further comprising:

providing a third value representative of the fluid flow rate through the second pump to a control device, and

determining if (i) the second value is accurate or (ii) the third value is accurate by correlating said third value with said second value.

17. The method according to claim 16 further comprising regulating said first pump if the determination is that (i) said second value is inaccurate or (ii) the third value is inaccurate.

18. The method according to claim 16 further comprising regulating said second pump if the determination is that (i) said second value is inaccurate or (ii) the third value is inaccurate.

19. The method according to claim 11 further comprising:

continuously pumping the fluid by said first pump away from said chamber during a predetermined treatment period at a predetermined first fluid flow rate,

pumping the fluid by said second pump at a predetermined second fluid flow rate when a predetermined minimum threshold of said first value is reached, and

stopping said second pump when a predetermined maximum threshold of said first value is reached.

20. The method according to claim 11 further comprising:

continuously pumping the fluid by said first pump into said chamber during a predetermined treatment period at a predetermined first fluid flow rate;

pumping the fluid by said second pump at a predetermined second fluid flow rate superior to the predetermined first fluid flow rate, when a predetermined maximum threshold of said first value is reached, and

stopping said second pump when a predetermined minimum threshold of said first value is reached.

21. An apparatus for controlling a fluid flow rate in a fluid transport line which is a waste line of a medical device, comprising:

a fluid transport line;

a first pump disposed in said fluid transport line for pumping the fluid;

a chamber disposed in said fluid transport line for collecting said fluid;

a sensor for providing a first value correlated to the amount of fluid in said chamber;

a control device configured for (i) receiving a second value representative of the fluid flow rate through the first pump (ii) converting the first value into a fluid flow rate value, and (iii) determining if the second value is accurate by comparing the fluid flow rate value to the second value; and

a fluid flow regulator disposed in said fluid transport line for regulating the flow rate of said fluid on a side opposite said chamber from said first pump, said fluid flow regulator being also operatively connected to said control device, wherein the fluid flow regulator includes a second pump disposed in said fluid transport line for pumping a fluid on the opposite side of said first chamber.

22. The apparatus according to claim 21, wherein the sensor is a weight sensor configured for controlling the weight of the fluid in said chamber or a level sensor configured for controlling the level of the fluid in said chamber.

23. The apparatus according to claim 21, wherein said first pump is continuously activated during a predetermined treatment period, and wherein a predetermined minimum threshold and a maximum threshold are provided for said first value, said fluid flow regulator or second pump being activated by said control device when said maximum threshold is reached and being inactivated when said minimum threshold is reached, said fluid flow regulator or second pump providing, when activated, a fluid flow rate superior to the fluid flow rate of said first pump.

24. A method for controlling a fluid flow rate in a fluid transport line which is a waste line of a medical device, comprising the steps of:

pumping a fluid through the fluid transport line by a first pump;

collecting said fluid passing in said transport line in a chamber;

sensing the amount of fluid in said chamber and generating a first value representative of the amount of fluid in said chamber;

sending the first value to a control device;

detecting and sending a second value representative of a fluid flow rate through the first pump to the control device;

converting the first value into a fluid flow rate value;

determining if the second value is accurate by comparing the fluid flow rate value to the second value; and

regulating a fluid flow rate of said fluid on a side opposite said first chamber from said first pump, the step of regulating including pumping the fluid with a second pump disposed in said fluid transport line on the side opposite said first chamber.

25. The method according to claim 24, further comprising:

continuously pumping the fluid by said first pump into said first chamber during a predetermined treatment period at a predetermined first fluid flow rate;

pumping the fluid by said second pump at a predetermined second fluid flow rate greater than the predetermined first fluid flow rate, when a predetermined maximum threshold of said first value is reached, and

stopping said second pump when a predetermined minimum threshold of said first value is reached.

26. An apparatus for controlling a fluid flow rate in a fluid transport line which is an infusion line of a medical device, comprising:

a fluid transport line;

a first pump disposed in said fluid transport line for pumping the fluid;

a chamber disposed in said fluid transport line for collecting said fluid;

a sensor for providing a first value correlated to the amount of fluid in said chamber;

a fluid flow regulator disposed in said fluid transport line for regulating the flow rate of said fluid on a side opposite said chamber from said first pump, wherein the fluid flow regulator includes a second pump disposed in said fluid transport line for pumping a fluid on the side opposite said first chamber;

a control device configured for (i) receiving a second value representative of the fluid flow rate through the first pump (ii) converting the first value into a fluid flow rate, and (iii) determining if the second value is accurate by comparing the fluid flow rate value to the second value; and

a fluid flow regulator disposed in said fluid transport line for regulating the flow rate of said fluid on a side opposite said chamber from said first pump, said fluid flow regulator being also operatively connected to said control device, wherein the fluid flow regulator includes a second pump disposed in said fluid transport line for pumping a fluid on the side opposite said first chamber.

27. A method for controlling a fluid flow rate in a fluid transport line which is an infusion line of a medical device, comprising the steps of:

pumping a fluid through a fluid transport line by a first pump;

collecting said fluid passing in said transport line in a chamber;

sensing the amount of fluid in said chamber and generating a first value representative of the amount of fluid in said chamber;

sending the first value to a control device;

detecting and sending a second value representative of a fluid flow rate through the first pump to the control device;

converting the first value into a fluid flow rate value;

determining if the second value is accurate by comparing the fluid flow rate value to the second value; and

regulating a fluid flow rate of said fluid on a side opposite said first chamber from said first pump, the step of regulating including pumping the fluid with a second pump disposed in said fluid transport line on the side opposite of said first chamber.