RESERVOIR PLUNGER POSITION MONITORING AND MEDICAL DEVICE INCORPORATING SAME
First Claim
1. An infusion device, comprising:
- a voided portion to receive a shaft portion including a displaceable shaft coupled to a plunger of a reservoir, the shaft portion comprising a protruding feature on the shaft; and
a sensing arrangement proximate the voided portion to sense the protruding feature, wherein an electrical characteristic of the sensing arrangement is influenced by contact with the protruding feature.
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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, and the infusion device includes a sensing arrangement 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 other embodiments, the control module identifies an anomalous condition based at least in part on the sensed position of the detectable feature.
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Citations
20 Claims
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1. An infusion device, comprising:
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a voided portion to receive a shaft portion including a displaceable shaft coupled to a plunger of a reservoir, the shaft portion comprising a protruding feature on the shaft; and a sensing arrangement proximate the voided portion to sense the protruding feature, wherein an electrical characteristic of the sensing arrangement is influenced by contact with the protruding feature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An infusion device, comprising:
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a housing including a voided region to receive a reservoir, the voided region including a voided portion to receive a shaft portion including a displaceable shaft coupled to a plunger of the reservoir, the shaft portion comprising a protruding feature on the shaft; and a sensing arrangement proximate the voided portion to sense the protruding feature when the reservoir is inserted in the voided region, wherein an electrical characteristic of the sensing arrangement is influenced by contact with the protruding feature. - View Dependent Claims (15, 16, 17, 18)
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19. A method of operating an infusion device to deliver fluid from a reservoir including a plunger coupled to a shaft, the infusion device including a sensing arrangement to sense a protruding feature on the shaft, the method comprising:
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operating a motor having a rotor coupled to the shaft to displace the shaft in response to rotation of the rotor, displacement of the shaft resulting in displacement of the plunger to deliver the fluid from the reservoir; obtaining a measured shaft position based at least in part on an electrical output signal provided by the sensing arrangement that is indicative of the protruding feature contacting the sensing arrangement, wherein the electrical output signal corresponds to a position of the protruding feature contacting the sensing arrangement; determining a remaining amount of fluid in the reservoir based on the measured shaft position; and providing a low fluid notification when the remaining amount is less than a threshold value. - View Dependent Claims (20)
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Specification