Reservoir fluid volume estimator and medical device incorporating same
First Claim
1. An infusion device, comprising:
- a housing including a voided portion to receive a shaft coupled to a plunger of a reservoir, the shaft further including a binary code;
a sensing arrangement disposed within the housing proximate to the voided portion, wherein the sensing arrangement includes an image sensor to detect the binary code and at least one light emitting element oriented towards the shaft to direct light on the binary code;
a motor having a rotor coupled to the shaft, the shaft being displaced to deliver fluid from the reservoir in response to rotation of the rotor;
a motor position sensor to measure an amount of rotation of the rotor; and
a control module coupled to the image sensor and the motor position sensor to perform a function based in part on the binary code detected by the image sensor and based in part on the amount of rotation of the rotor measured by the motor position sensor, wherein the function performed by the control module includes obtaining a measured position of the shaft using the binary code detected by the image sensor and determining an expected position of the shaft using the amount of rotation of the rotor measured by the motor position sensor.
1 Assignment
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Accused Products
Abstract
Apparatus are provided for infusion devices and related control systems and methods. In one embodiment, an infusion device includes a voided portion adapted to receive a shaft portion that includes a shaft coupled to a plunger of a reservoir. The shaft portion includes a detectable feature having an optically detectable pattern such as gray code, and the infusion device includes a sensing arrangement having an optical sensor proximate the voided portion to sense the detectable feature. In some embodiments, a control module is coupled to the sensing arrangement to determine a remaining amount of fluid in the reservoir based at least in part on the sensed position of the detectable feature. In embodiments, the optical sensor detects the sensed position of the shaft based on the detectable feature only when the reservoir is replaced and/or after each delivery of fluid to reduce power consumption.
88 Citations
16 Claims
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1. An infusion device, comprising:
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a housing including a voided portion to receive a shaft coupled to a plunger of a reservoir, the shaft further including a binary code; a sensing arrangement disposed within the housing proximate to the voided portion, wherein the sensing arrangement includes an image sensor to detect the binary code and at least one light emitting element oriented towards the shaft to direct light on the binary code; a motor having a rotor coupled to the shaft, the shaft being displaced to deliver fluid from the reservoir in response to rotation of the rotor; a motor position sensor to measure an amount of rotation of the rotor; and a control module coupled to the image sensor and the motor position sensor to perform a function based in part on the binary code detected by the image sensor and based in part on the amount of rotation of the rotor measured by the motor position sensor, wherein the function performed by the control module includes obtaining a measured position of the shaft using the binary code detected by the image sensor and determining an expected position of the shaft using the amount of rotation of the rotor measured by the motor position sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method estimating an amount of fluid in a reservoir of an infusion device, the reservoir including a plunger coupled to a shaft such that displacement of the shaft results in displacement of the plunger, the infusion device including a sensing arrangement having an image sensor to detect a binary code on the shaft, a motor having a rotor coupled to the shaft, the shaft being displaced to deliver fluid from the reservoir in response to rotation of the rotor, a motor position sensor to measure an amount of rotation of the rotor, and a control module coupled to the image sensor and the motor position sensor, the method comprising:
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detecting at least a portion of the binary code; measuring the amount of rotation of the rotor; determining the amount of fluid in the reservoir based in part on the binary code detected by the image sensor and based in part on the amount of rotation of the rotor measured by the motor position sensor; obtaining a measured position of the shaft using the binary code detected by the image sensor; determining an expected position of the shaft using the amount of rotation of the rotor measured by the motor position sensor; and identifying an anomalous condition based on a difference between the expected position and the measured position. - View Dependent Claims (15)
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16. An infusion device, comprising:
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a housing including a voided portion to receive a shaft coupled to a plunger of a reservoir, the shaft further including a binary code; a sensing arrangement disposed within the housing proximate to the voided portion, wherein the sensing arrangement includes an image sensor to detect the binary code and at least one light emitting element oriented towards the shaft to direct light on the binary code; a motor having a rotor coupled to the shaft, the shaft being displaced to deliver fluid from the reservoir in response to rotation of the rotor; a motor position sensor to measure an amount of rotation of the rotor; and a control module coupled to the image sensor and the motor position sensor to perform a function based in part on the binary code detected by the image sensor and based in part on the amount of rotation of the rotor measured by the motor position sensor, wherein the function performed by the control module includes implementing a counter that counts the incremental rotations detected by the position sensor and is reset each time a row of the binary code is detected by the image sensor.
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Specification