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公开(公告)号：DE69030254T2
公开(公告)日：1997-10-30
申请号：DE69030254
申请日：1990-11-28
Applicant: BAXTER INT
Inventor： MATTHEWS JOSEPH , BOWMAN GEORGE
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公开(公告)号：DE69219726D1
公开(公告)日：1997-06-19
申请号：DE69219726
申请日：1992-06-05
Applicant: BAXTER INT
Inventor： BOWMAN GEORGE , GOLOSKI LEONARD
Abstract: The present invention provides an improved, low cost method and apparatus for monitoring the intravenous metering of fluids to a patient. The present invention provides a strain gauge which is preferably a balanced metal beam. Conditioning circuitry is provided which has as input the strain gauge output. The output of the conditioning circuit is inputted into occlusion sensing circuit. The output of occlusion sensing circuit is inputted into an air sensing circuit. The output of both the occlusion sensing circuit and the air sensing circuit are inputted into an analog to digital convertor which is monitored by a microprocessor for abnormal signals.
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公开(公告)号：DE69022586T2
公开(公告)日：1996-05-30
申请号：DE69022586
申请日：1990-11-28
Applicant: BAXTER INT
Inventor： MATTHEWS JOSEPH , BOWMAN GEORGE
Abstract: The present invention provides a drive signal for a peristaltic pump motor. A first circuit is provided which generates a first series of pulses at a given frequency. A second circuit is provided which generates a second series of pulses having a frequency higher than the frequency of the first series of pulses. A third circuit is provided which generates a third series of pulses having a frequency between the frequency of the first and second series of pulses. Finally, a circuit is provided which combines the three series of pulses into a drive signal. The drive signal length is determined by the frequency of the first series of pulses. The drive signal further is divided into two sections, an initial pulse stage determined by the frequency of the third series of pulses, and a modulated pulse stage being a series of pulses determined by the frequency of the second series of pulses.
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公开(公告)号：DE69723936D1
公开(公告)日：2003-09-11
申请号：DE69723936
申请日：1997-01-23
Applicant: BAXTER INT
Inventor： BOWMAN GEORGE , MATTHEWS JOSEPH , EYSTER KURT
Abstract: The present invention provides an apparatus for detecting excessive air in a liquid flow-through tube. The apparatus includes an ultrasonic transmitter for transmitting ultrasonic signals and an ultrasonic receiver for receiving ultrasonic signals. The ultrasonic transmitter and ultrasonic receiver are separated by the IV tube. The apparatus further provides circuit means for generating at least two transmitting signals to actuate the ultrasonic transmitter and circuit means for detecting received signals. Means are provided for determining whether the received signal is indicative of air or liquid in the IV tube. The apparatus further relies on logarithmic detection of air in fluids rather than linear detection which provides a larger safety factor in prediction of air embolus.
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公开(公告)号：CA2223841C
公开(公告)日：2000-08-01
申请号：CA2223841
申请日：1997-01-23
Applicant: BAXTER INT
Inventor： ESCHE GRACE , BOWMAN GEORGE
Abstract: The present invention provides an estimate of the amount of time left on the battery by monitoring not only the voltage available from the battery, but also the amount of current flowing from the battery. It has been found that periodic sampling of the battery voltage and current drain enables accurate battery monitoring. The sampling technique alternates between sampling battery voltage and sampling current drain. An electric circuit is provided which enables the cost-effective sampling to occur. A method is then applied to the sampling signals by a microprocessor which determines the amount of time left under battery power. In a preferred embodiment, a graphic representation is provided of the amount of battery time left.
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Patent Agency Ranking
公开(公告)号：NZ329318A
公开(公告)日：1998-10-28
申请号：NZ32931897
申请日：1997-01-23
Applicant: BAXTER INT
Inventor： BOWMAN GEORGE , ESCHE GRACE
Abstract: The present invention provides an estimate of the amount of time left on the battery by monitoring not only the voltage available from the battery, but also the amount of current flowing from the battery. It has been found that periodic sampling of the battery voltage and current drain enables accurate battery monitoring. The sampling technique alternates between sampling battery voltage and sampling current drain. An electric circuit is provided which enables the cost-effective sampling to occur. A method is then applied to the sampling signals by a microprocessor which determines the amount of time left under battery power. In a preferred embodiment, a graphic representation is provided of the amount of battery time left.
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公开(公告)号：DE69723936T2
公开(公告)日：2004-06-03
申请号：DE69723936
申请日：1997-01-23
Applicant: BAXTER INT
Inventor： BOWMAN GEORGE , MATTHEWS JOSEPH , EYSTER KURT
Abstract: The present invention provides an apparatus for detecting excessive air in a liquid flow-through tube. The apparatus includes an ultrasonic transmitter for transmitting ultrasonic signals and an ultrasonic receiver for receiving ultrasonic signals. The ultrasonic transmitter and ultrasonic receiver are separated by the IV tube. The apparatus further provides circuit means for generating at least two transmitting signals to actuate the ultrasonic transmitter and circuit means for detecting received signals. Means are provided for determining whether the received signal is indicative of air or liquid in the IV tube. The apparatus further relies on logarithmic detection of air in fluids rather than linear detection which provides a larger safety factor in prediction of air embolus.
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公开(公告)号：DK0837709T3
公开(公告)日：2003-11-24
申请号：DK97903028
申请日：1997-01-23
Applicant: BAXTER INT
Inventor： BOWMAN GEORGE , MATTHEWS JOSEPH , EYSTER KURT
Abstract: The present invention provides an apparatus for detecting excessive air in a liquid flow-through tube. The apparatus includes an ultrasonic transmitter for transmitting ultrasonic signals and an ultrasonic receiver for receiving ultrasonic signals. The ultrasonic transmitter and ultrasonic receiver are separated by the IV tube. The apparatus further provides circuit means for generating at least two transmitting signals to actuate the ultrasonic transmitter and circuit means for detecting received signals. Means are provided for determining whether the received signal is indicative of air or liquid in the IV tube. The apparatus further relies on logarithmic detection of air in fluids rather than linear detection which provides a larger safety factor in prediction of air embolus.
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公开(公告)号：AU1705497A
公开(公告)日：1997-10-29
申请号：AU1705497
申请日：1997-01-23
Applicant: BAXTER INT
Inventor： BOWMAN GEORGE , MATTHEWS JOSEPH , EYSTER KURT
Abstract: The present invention provides an apparatus for detecting excessive air in a liquid flow-through tube. The apparatus includes an ultrasonic transmitter for transmitting ultrasonic signals and an ultrasonic receiver for receiving ultrasonic signals. The ultrasonic transmitter and ultrasonic receiver are separated by the IV tube. The apparatus further provides circuit means for generating at least two transmitting signals to actuate the ultrasonic transmitter and circuit means for detecting received signals. Means are provided for determining whether the received signal is indicative of air or liquid in the IV tube. The apparatus further relies on logarithmic detection of air in fluids rather than linear detection which provides a larger safety factor in prediction of air embolus.
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公开(公告)号：DE69022586D1
公开(公告)日：1995-10-26
申请号：DE69022586
申请日：1990-11-28
Applicant: BAXTER INT
Inventor： MATTHEWS JOSEPH , BOWMAN GEORGE
Abstract: The present invention provides a drive signal for a peristaltic pump motor. A first circuit is provided which generates a first series of pulses at a given frequency. A second circuit is provided which generates a second series of pulses having a frequency higher than the frequency of the first series of pulses. A third circuit is provided which generates a third series of pulses having a frequency between the frequency of the first and second series of pulses. Finally, a circuit is provided which combines the three series of pulses into a drive signal. The drive signal length is determined by the frequency of the first series of pulses. The drive signal further is divided into two sections, an initial pulse stage determined by the frequency of the third series of pulses, and a modulated pulse stage being a series of pulses determined by the frequency of the second series of pulses.
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