INFUSION DEVICE OCCLUSION DETECTION SYSTEM
First Claim
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1. A method for detecting occlusions during use of an infusion device, comprising:
- generating a plurality of residual sum values from a plurality of respective variable volumes dispensed from the infusion device, each variable volume being dispensed by—
performing a plurality of dispense cycles with the infusion device, each dispense cycle comprising—
providing power to a motor of the infusion device to generate a motive force;
translating a spool slidably disposed within a bore with the motive force from the motor;
transferring a sub-variable volume of fluid from a variable volume cavity of the spool into an output port which is in fluid communication with the bore as a volume of the variable volume cavity is decreased by the motion of the spool;
terminating the power to the motor; and
measuring a residual displacement datum of the spool while no power is provided to the motor with a position measurement device by measuring the difference in a position of the spool at the termination of the power to the motor and a position of the spool at a cessation of motion of the spool; and
summing the residual displacement data from each dispense cycle performed while dispensing the respective volume of fluid in order to generate a respective residual sum value;
individually loading a plurality of successive residual sum values into a filter with each residual sum value generating a respective filter output, the filter output being a running weighted average of residual sum values which have been loaded into the filter to generate a nominal filter output value;
comparing a plurality of residual sum values generated subsequent to the generation of the nominal filter output value to the nominal filter output value in order to determine if each residual sum value exceeds the nominal filter output value by a threshold difference value; and
alerting a user of the infusion device to an occlusion if a plurality of successive residual sum values surpass the nominal filter output value by the threshold difference value.
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Abstract
Device and method embodiments are described which are capable of detecting and alerting a user of an infusion device to a hindrance in the ability to deliver measured quantities of fluids. In some cases, the devices and method embodiments for such occlusion detection do not require significant modification of an infusion device and can be carried out with a minimum of additional components.
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Citations
29 Claims
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1. A method for detecting occlusions during use of an infusion device, comprising:
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generating a plurality of residual sum values from a plurality of respective variable volumes dispensed from the infusion device, each variable volume being dispensed by— performing a plurality of dispense cycles with the infusion device, each dispense cycle comprising— providing power to a motor of the infusion device to generate a motive force; translating a spool slidably disposed within a bore with the motive force from the motor; transferring a sub-variable volume of fluid from a variable volume cavity of the spool into an output port which is in fluid communication with the bore as a volume of the variable volume cavity is decreased by the motion of the spool; terminating the power to the motor; and measuring a residual displacement datum of the spool while no power is provided to the motor with a position measurement device by measuring the difference in a position of the spool at the termination of the power to the motor and a position of the spool at a cessation of motion of the spool; and summing the residual displacement data from each dispense cycle performed while dispensing the respective volume of fluid in order to generate a respective residual sum value; individually loading a plurality of successive residual sum values into a filter with each residual sum value generating a respective filter output, the filter output being a running weighted average of residual sum values which have been loaded into the filter to generate a nominal filter output value; comparing a plurality of residual sum values generated subsequent to the generation of the nominal filter output value to the nominal filter output value in order to determine if each residual sum value exceeds the nominal filter output value by a threshold difference value; and alerting a user of the infusion device to an occlusion if a plurality of successive residual sum values surpass the nominal filter output value by the threshold difference value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An infusion device, comprising:
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a motor capable of generating a motive force when power is provided to the motor; a bore which may contain a fluid; an output port which is in fluid communication with the bore; a spool coupled to the motor, the spool including a variable volume cavity and being slidably disposed within the bore, the spool being capable of a dispense cycle wherein power is provided to the motor and the resulting motive force translates the spool within the bore thereby decreasing a variable volume contained within the variable volume cavity and transferring a sub-variable volume of fluid from the variable volume cavity to the output port; a position measurement device configured to measure the axial position of the spool, the position measurement device being configured to measure a residual displacement datum at the end of a dispense cycle by measuring a difference in a position of the spool at the termination of power to the motor and a position of the spool at a cessation of the motion of the spool; and a control system which is configured to analyze the residual displacement datum in order to determine if an occlusion criterion is satisfied. - View Dependent Claims (10, 11, 12)
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13. A method for detecting occlusions during use of an infusion device, comprising:
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performing a dispense cycle with the infusion device, the dispense cycle comprising— providing power to a motor of the infusion device to generate a motive force; translating a spool slidably disposed within a bore with the motive force from the motor; transferring a sub-variable volume of fluid from a variable volume cavity formed by the spool into an output port which is in fluid communication with the bore as a variable volume of fluid contained within the variable volume cavity is decreased by the motion of the spool; terminating the power to the motor; and measuring a residual displacement datum of the spool while no power is provided to the motor with a position measurement device by measuring the difference in a position of the spool at the termination of the power to the motor and a position of the spool at a cessation of motion of the spool; and analyzing the residual displacement datum in order to determine if an occlusion criterion is satisfied. - View Dependent Claims (14, 15)
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16. An infusion device, comprising:
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a motor capable of generating a motive force when power is provided to the motor; a bore which may contain a fluid; an output port which is in fluid communication with the bore; a spool coupled to the motor, the spool including a variable volume cavity and being slidably disposed within the bore, the spool being capable of a dispense cycle wherein power is provided to the motor and the resulting motive force translates the spool within the bore thereby decreasing a variable volume of fluid contained within the variable volume cavity and transferring a sub-variable volume of the fluid from the variable volume cavity to the output port; a position measurement device configured to measure the axial position of the spool, the position measurement device being configured to measure a residual displacement datum at the end of a dispense cycle by measuring a difference in a position of the spool at the termination of power to the motor and a position of the spool at a cessation of the motion of the spool; and a control system which is configured to sum residual displacement data from a plurality of dispense cycles in order to generate a residual sum value and then analyze the residual sum value in order to determine if an occlusion criterion is satisfied. - View Dependent Claims (17, 18, 19)
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20. A method for detecting occlusions during use of an infusion device, comprising:
performing a plurality of dispense cycles with the infusion device, each dispense cycle comprising— providing power to a motor of the infusion device to generate a motive force; translating a spool slidably disposed within a bore with the motive force from the motor; transferring a sub-variable volume of fluid from a variable volume cavity formed by the spool into an output port which is in fluid communication with the bore as a variable volume of fluid contained within the variable volume cavity is decreased by the motion of the spool; terminating the power to the motor; and measuring a residual displacement datum of the spool while no power is provided to the motor with a position measurement device by measuring the difference in a position of the spool at the termination of the power to the motor and a position of the spool at a cessation of motion of the spool; summing the residual displacement data from each dispense cycle from the same variable volume in order to generate a residual sum value; and analyzing the residual sum value in order to determine if an occlusion criterion is satisfied. - View Dependent Claims (21, 22, 23)
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24. An infusion device, comprising:
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a motor capable of generating a motive force when power is provided to the motor; a bore which may contain a fluid; an output port which is in fluid communication with the bore; a spool coupled to the motor and being slidably disposed within the bore, the spool having a variable volume cavity and being capable of a dispense cycle wherein power is provided to the motor and the resulting motive force translates the spool within the bore thereby decreasing a variable volume of fluid contained within the variable volume cavity and transferring a sub-variable volume of fluid from the variable volume cavity to the output port; a position measurement device configured to measure the axial position of the spool, the position measurement device being configured to measure a residual displacement datum at the end of a dispense cycle by measuring a difference in a position of the spool at the termination of power to the motor and a position of the spool at a cessation of the motion of the spool; and a control system which is configured to sum residual displacement data from a plurality of dispense cycles which deliver a respective variable volume of fluid in order to generate a residual sum value, to generate a plurality of respective residual sum values from a plurality of respective variable volumes dispensed, and to analyze the plurality of residual sum values and indicate an occluded state if the plurality of residual sum values satisfy an occlusion criterion. - View Dependent Claims (25, 26, 27, 28, 29)
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Specification