Infusion pump monitoring encoder/decoder
First Claim
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1. A monitor for monitoring the position of a motor shaft comprising:
- an encoder wheel connected to the motor shaft, the encoder wheel defining at least one blocking area and at least one non-blocking area;
a first detector for detecting a transition selected from the group consisting of a transition from a blocking area to a non-blocking area and a transition from a non-blocking area to a blocking area of the encoder wheel;
a second detector circumferentially offset from the first detector, the second detector detecting the presence or absence of the blocking area of the encoder wheel;
means for correlating the position of the motor shaft to one of a plurality of states defined by the readings of the first and second detectors; and
means within the correlating means for transitioning from one state to another state when a transition between a blocking area and a non-blocking area is detected by the first detector and for determining the state by the presence or absence of the blocking area as detected by the second detector.
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Abstract
The present invention provides a method and apparatus for monitoring an infusion pump (10). The method and apparatus provides an encoder (101) which is used with a motor (65) of the infusion pump (10) and a monitoring method which effectively provides rotational directional information. The present invention utilizes a state transition of a first switch (111) indexed against a constant signal from a second switch (113) corresponding to the center of a flag (117) or sector (119).
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Citations
21 Claims
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1. A monitor for monitoring the position of a motor shaft comprising:
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an encoder wheel connected to the motor shaft, the encoder wheel defining at least one blocking area and at least one non-blocking area; a first detector for detecting a transition selected from the group consisting of a transition from a blocking area to a non-blocking area and a transition from a non-blocking area to a blocking area of the encoder wheel; a second detector circumferentially offset from the first detector, the second detector detecting the presence or absence of the blocking area of the encoder wheel; means for correlating the position of the motor shaft to one of a plurality of states defined by the readings of the first and second detectors; and means within the correlating means for transitioning from one state to another state when a transition between a blocking area and a non-blocking area is detected by the first detector and for determining the state by the presence or absence of the blocking area as detected by the second detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for monitoring the position of a motor shaft comprising:
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defining at least one blocking area and at least one non-blocking area of an encoder wheel connected to the motor shaft; detecting a transition selected from the group consisting of a transition from a blocking area to a non-blocking area and a transition from a non-blocking area to a blocking area of the encoder wheel; detecting in a second location circumferentially offset from the first detecting step the presence or absence of the blocking area of the encoder wheel; correlating the position of the motor shaft to one of a plurality of states defined by the readings of the first and second detections; and transitioning from one state to another when a transition between a blocking area and a non-blocking area is detected by the first detection and for determining the state by the presence or absence of the blocking area as detected by the second detection. - View Dependent Claims (11, 12)
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13. A monitor for monitoring the position of a motor shaft comprising:
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an encoder wheel connected to the motor shaft, the encoder wheel defining at least one blocking area and at least one non-blocking area; a first detector which detects a transition selected from the group consisting of a transition from a blocking area to a non-blocking area and a transition from a non-blocking area to a blocking area of the encoder wheel; a second detector circumferentially offset from the first detector, the second detector detecting the presence or absence of the blocking area of the encoder wheel; a correlator which correlates the position of the motor shaft to one of a plurality of states defined by the readings of the first and second detectors; and the correlator comprising a transitioner which transitions from one state to another state when a transition between a blocking area and a non-blocking area is detected by the first detector and a determiner which determines the state by the presence or absence of the blocking area as detected by the second detector. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification