Device and method for automatic injection and occlusion detection
First Claim
1. An injection device for injecting automatically a medicament, the injection device comprising:
- a force measurement unit to measure an injection force;
a first occlusion detector to take force measurements at a first measurement rate and to generate a first occlusion indicating signal based on a set of force measurements taken at the first measurement rate;
a second occlusion detector to take force measurements at a second measurement rate, lower than the first measurement rate, and to generate a second occlusion indicating signal based on a set of force measurements taken at the second measurement rate; and
an alarm generator to generate an occlusion alarm signal in cases where the first occlusion indicating signal is generated by the first occlusion detector or the second occlusion indicating signal is generated by the second occlusion detector.
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Abstract
An injection device for injecting automatically a medicament comprises an occlusion detection system with a force measurement unit and two separate occlusion detectors. The occlusion detectors take force measurements at different respective measurement rates and generate occlusion indicating signals based on a set of force measurements taken at the respective measurement rates. The injection device further comprises an alarm generator for generating an occlusion alarm signal in cases where either or both of the occlusion detectors generate an occlusion indicating signal. The two occlusion detectors operating at different measurement rates make it possible to detect occlusions more reliably over a broader range of delivery rates.
26 Citations
18 Claims
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1. An injection device for injecting automatically a medicament, the injection device comprising:
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a force measurement unit to measure an injection force; a first occlusion detector to take force measurements at a first measurement rate and to generate a first occlusion indicating signal based on a set of force measurements taken at the first measurement rate; a second occlusion detector to take force measurements at a second measurement rate, lower than the first measurement rate, and to generate a second occlusion indicating signal based on a set of force measurements taken at the second measurement rate; and an alarm generator to generate an occlusion alarm signal in cases where the first occlusion indicating signal is generated by the first occlusion detector or the second occlusion indicating signal is generated by the second occlusion detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of detecting an occlusion in an injection device for injecting automatically a medicament, the method comprising:
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measuring an injection force; taking force measurements at a first measurement rate by a first occlusion detector and generating a first occlusion indicating signal based on a set of force measurements taken at the first measurement rate; taking force measurements at a second measurement rate, lower than the first measurement rate, by a second occlusion detector and generating a second occlusion indicating signal based on a set of force measurements taken at the second measurement rate; and generating an occlusion alarm signal when where the first occlusion indicating signal is generated by the first occlusion detector or the second occlusion indicating signal is generated by the second occlusion detector. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification