Automatic infusion pump
First Claim
1. An infusion pump for the intravenous or inter-arterial infusion of a dosage of a liquid medicine into a patient, which comprises(a) a drive electrically operated at a controlled frequency for driving the pump, the drive frequency controlling the dosage delivered by the pump,(b) means for measuring a physical parameter of the patient and for generating a digital signal corresponding to the measured physical parameter,(c) means for generating a reference digital signal corresponding to an adjustable desired parameter,(d) an electronic drive control comprised of a microprocessor, the control including(1) a frequency generator having an output connected to the drive whereby the frequency of the drive and the corresponding dosage is controlled,(2) digital-electronic means in the microprocessor and responsive to the digital signals,(3) means for delivering a time delay signal to the digital-electronic means,(4) the digital-electronic means in response to the signals maintaining the frequency unchanged as long as the difference between the digital signals is within the limits of a predetermined percentage range of deviation, increasing or decreasing the frequency by a set step after a time delay responsive to the time delay signal when an upper limit of the range of deviation is exceeded or falls below a lower limit, and reducing the frequency to zero when the effect of the medicine changes the measured physical parameter of the patient beyond a predetermined limit of a percentage range within the time delay, and(e) digital indicator means connected to the microprocessor for generating an alarm signal when the limits are beyond a normal range.
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Accused Products
Abstract
An infusion pump for the intravenous or intra-arterial infusion of liquid medicines has an electric drive and electronic control, with means so associated with the digital frequency control of the frequency generator (4) for operating the infusion pump motor that the delivered infusion dosage in changed step-by-step after an adjustable time delay by changing the frequency in dependence on physical parameters taken from the patient, and suddenly rising or falling changes in the physical parameters, which are outside a predetermined norm, cause the device to be switched off and generate an alarm.
192 Citations
6 Claims
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1. An infusion pump for the intravenous or inter-arterial infusion of a dosage of a liquid medicine into a patient, which comprises
(a) a drive electrically operated at a controlled frequency for driving the pump, the drive frequency controlling the dosage delivered by the pump, (b) means for measuring a physical parameter of the patient and for generating a digital signal corresponding to the measured physical parameter, (c) means for generating a reference digital signal corresponding to an adjustable desired parameter, (d) an electronic drive control comprised of a microprocessor, the control including (1) a frequency generator having an output connected to the drive whereby the frequency of the drive and the corresponding dosage is controlled, (2) digital-electronic means in the microprocessor and responsive to the digital signals, (3) means for delivering a time delay signal to the digital-electronic means, (4) the digital-electronic means in response to the signals maintaining the frequency unchanged as long as the difference between the digital signals is within the limits of a predetermined percentage range of deviation, increasing or decreasing the frequency by a set step after a time delay responsive to the time delay signal when an upper limit of the range of deviation is exceeded or falls below a lower limit, and reducing the frequency to zero when the effect of the medicine changes the measured physical parameter of the patient beyond a predetermined limit of a percentage range within the time delay, and (e) digital indicator means connected to the microprocessor for generating an alarm signal when the limits are beyond a normal range.
Specification