Smart actuator for valve

• US 9,354,640 B2
• Filed: 11/11/2013
• Issued: 05/31/2016
• Est. Priority Date: 11/11/2013
• Status: Active Grant

• Current Assignee: Fresenius Medical Care Holdings Incorporated (Fresenius Medical Care AG)
• Original Assignee: Fresenius Medical Care Holdings Incorporated (Fresenius Medical Care AG)
• Inventors: Byler, Terry Lynn
• Primary Examiner(s): McManmon, Mary
• Assistant Examiner(s): Morales, David Colon
• Application Number:
  US14/077,112
• Publication Number:
  US 20150129055A1
• Time in Patent Office: 932 Days
• Field of Search: 137/554, 137/487.5, 251/129.11, 251/129.12, 251/129.13, 251 7- 8, 251318-319, 251/331, 251/335.2, 251/129.04, 251/4, 731/68, 700/282
• US Class Current: 1/1
• CPC Class Codes: A61M 1/14 Dialysis systems; Artificial kidneys; Blood oxygenators semi-permeable membranes characterised by the material, manufacturing processes therefor B01D71/00 ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis
• CPC Class Codes: A61M 2039/226 Spindles or actuating means
• CPC Class Codes: A61M 2205/10 with powered movement mechanisms
• CPC Class Codes: A61M 2205/128 with incorporated valves
• CPC Class Codes: A61M 2205/332 Force measuring means
• CPC Class Codes: A61M 2205/3331 Pressure; Flow
• CPC Class Codes: A61M 39/22 Valves or arrangement of valves A61M39/02, A61M39/0247, A61M39/16 take precedence; regulating valves in infusion systems A61M5/16881; in devices worn by the patient for the reception of urine, faeces, catamenial or other discharge, or in colostomy devices A61F5/4405
• CPC Class Codes: F16K 31/04 using a motor
• CPC Class Codes: F16K 37/0083 by measuring valve parameters
• CPC Class Codes: G05D 16/202 actuated by an electric motor
• CPC Class Codes: Y10T 137/7761 Electrically actuated valve

Abstract

A system and method of monitoring and controlling the open and close states of a manifold diaphragm type valve includes using an actuator mechanism with feedback control. A pressure transducer and/or force gauge located on the contact end of the actuator mechanism monitors the pressure and/or force applied to the end of the actuator mechanism. A controller instructs the actuator mechanism to move forward or backward an appropriate distance based on the monitored pressure and/or force. Temperature and pressure changes in the system and material changes to the diaphragm are sensed immediately and positioning correction is applied to the actuator in real-time, thereby maintaining the same valve state while monitoring pressure separately. The linear actuator functions as a ‘smart’ actuator, capable of fine tune adjustments without additional outside monitoring and providing a more accurate and reliable method of closing the valve in a dynamic environment.

Claims

1. A valve actuator system adapted to open and close a valve, comprising an orifice closing member, positioned within a surface of a manifold and adjacent a fluid pathway through which fluid flows in a dialysis system, said valve actuator mechanism comprising:

a displacement member adapted to being displaced linearly and having a contact end, wherein said contact end is positioned outside said manifold surface and proximate to said orifice closing member when said valve is in an open state and wherein said contact end pushes the orifice closing member into said manifold, resulting in both the contact end and orifice closing member being inside said manifold, when the valve is in a closed state;

a motor for moving said displacement member;

at least one pressure sensor positioned on said contact end and positioned between said contact end and the orifice closing member for sensing pressure generated when said contact end is in physical communication with said orifice closing member and for relaying data based on said sensed pressure; and

a controller for receiving the sensed pressure from the at least one pressure sensor, wherein said controller comprises a memory having stored therein a plurality of programmatic instructions that, when executed by a processing unit, compare said sensed pressure to a pre-determined value stored in said memory and activate said motor to move said displacement member toward or away from said orifice closing member to optimally position the contact end against said orifice closing member.

2. The valve actuator system of claim 1, wherein said motor comprises a stepper motor.

3. The valve actuator system of claim 1, wherein said motor comprises a DC motor.

4. The valve actuator system of claim 1, further comprising an encoder for determining amount of movement of said displacement member.

5. The valve actuator system of claim 1 for use in a dialysis machine.

6. The valve actuator system of claim 5, wherein said controller is programmed to cause said motor to move such that a sensed pressure of at least 2 psi is maintained.

7. A valve actuator system adapted to open and close a valve, comprising an orifice closing member, positioned within a surface of a manifold and adjacent a fluid pathway through which fluid flows in a dialysis system, said valve actuator mechanism comprising:

a displacement member adapted to being displaced linearly and having a contact end wherein said contact end is positioned outside said manifold surface and proximate to said orifice closing member when said valve is in an open state and wherein said contact end pushes the orifice closing member into said manifold, resulting in both the contact end and orifice closing member being inside said manifold, when the valve is in a closed state;

a motor for moving said displacement member;

at least one force sensor positioned on said contact end and between said contact end and the orifice closing member for sensing force generated when said contact end is in physical communication with said orifice closing member and for relaying data based on said sensed force; and

a controller for receiving the sensed force from the at least one force sensor, wherein said controller comprises a memory having stored therein a plurality of programmatic instructions that, when executed by a processing unit, compare said sensed force to a pre-determined value stored in said memory and activate said motor to move said displacement member toward or away from said orifice closing member to optimally position the contact end against said orifice closing member.

8. The valve actuator system of claim 7, wherein said motor comprises a stepper motor.

9. The valve actuator system of claim 7, wherein said motor comprises a DC motor.

10. The valve actuator system of claim 7, further comprising an encoder for determining amount of movement of said displacement member.

11. The valve actuator system of claim 7 for use in a dialysis machine.

12. The valve actuator system of claim 11, wherein said controller is programmed to cause said motor to move such that a force of at least 5 pound-force (lb_F) is maintained.

13. A valve actuator system adapted to open and close a valve, comprising an orifice closing member, positioned within a surface of a manifold and adjacent a fluid pathway through which fluid flows in a dialysis system, said valve actuator mechanism comprising:

a displacement member adapted to being displaced linearly and having a contact end wherein said contact end is positioned outside said manifold surface and proximate to said orifice closing member when said valve is in an open state and wherein said contact end pushes the orifice closing member into said manifold, resulting in both the contact end and orifice closing member being inside said manifold, when the valve is in a closed state;

a motor for moving said displacement member;

at least one pressure sensor positioned on said contact end and between said contact end and the orifice closing member for sensing pressure generated when said contact end is in physical communication with said orifice closing member and for relaying data based on said sensed pressure;

at least one force gauge positioned on said contact end for sensing force generated when said contact end is in physical communication with said orifice closing member and for relaying data based on said sensed force; and

a controller for receiving the sensed pressure from the at least one pressure sensor and the sensed force from the at least one force gauge, wherein said controller comprises a memory having stored therein a plurality of programmatic instructions that, when executed by a processing unit, compare said sensed pressure to a pre-determined pressure value stored in said memory and said sensed force to a pre-determined force value stored is said memory and activate said motor to move said displacement member toward or away from said orifice closing member to optimally position the contact end against said orifice closing member.

14. The valve actuator system of claim 13, wherein said motor comprises a stepper motor.

15. The valve actuator system of claim 13, wherein said motor comprises a DC motor.

16. The valve actuator system of claim 13, further comprising an encoder for determining amount of movement of said displacement member.

17. The valve actuator system of claim 13 for use in a dialysis machine.

18. The valve actuator system of claim 17, wherein said controller is programmed to move said motor such that a sensed pressure of at least 2 psi is maintained.

19. The valve actuator system of claim 17, wherein said controller is programmed to move said motor such that a force of at least 5 pound-force (lb_F) is maintained.