Dosing device for controlled injection of liquid from a reservoir into an organism
First Claim
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1. A dosing device for injecting liquids from a reservoir into an organism comprising:
- pump means for transferring said liquid said reservoir to said organism in a selected dose, said pump means including a cylinder housing with a movable piston disposed in said cylinder housing, said pump means further including energizable electromagnetic excitation means for moving, if energized, said piston from a rest position in said cylinder housing through a stroke to convey said liquid through said pump means to said organism, and restoring means for returning said piston to said rest position when the electromagnetic excitation means is not energized;
noise sensor means arranged relative to said pump means for obtaining a signal representing a time-dependent curve of the piston motion for each stroke;
means connected to said noise sensor means for monitoring the amplitude of said curve; and
means in communication with said means for monitoring the amplitude of said curve for generating a corrective signal, if needed, based on said amplitude of said curve.
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Abstract
A dosing device of the type which can be implanted in a patient to control injection of liquids from a reservoir into the patient has an electrically controllable piston pump and a circuit responsible for controlling and monitoring the operation of the pump. The circuit includes a unit for acquiring a chronological curve representative of the piston motion, and electrical signals proportional thereto are obtained. These signals are supplied to control elements which compare these signals to prescribed rated values, and generate control and alarm signals given deviations of the incoming signals from the rated values.
188 Citations
21 Claims
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1. A dosing device for injecting liquids from a reservoir into an organism comprising:
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pump means for transferring said liquid said reservoir to said organism in a selected dose, said pump means including a cylinder housing with a movable piston disposed in said cylinder housing, said pump means further including energizable electromagnetic excitation means for moving, if energized, said piston from a rest position in said cylinder housing through a stroke to convey said liquid through said pump means to said organism, and restoring means for returning said piston to said rest position when the electromagnetic excitation means is not energized; noise sensor means arranged relative to said pump means for obtaining a signal representing a time-dependent curve of the piston motion for each stroke; means connected to said noise sensor means for monitoring the amplitude of said curve; and means in communication with said means for monitoring the amplitude of said curve for generating a corrective signal, if needed, based on said amplitude of said curve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A dosing device for injecting liquids from a reservoir into an organism comprising:
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pump means for transferring said liquid from reservoir to said organism in a selected dose, said pump means including a cylinder housing with a movable piston disposed in said cylinder housing, said pump means further including, electromagnetic excitation means connected to means for energizing for moving, if energized, said piston from a rest position in said cylinder housing through a stroke, to convey said liquid through said pump means to said organism, and restoring means for returning said piston to said rest position when the electromagnetic excitation means is not energized; means arranged relative to said pump mens for obtaining a signal representing a time-dependent curve of the piston motion for each stroke; means connected to said means for obtaining a signal for monitoring the amplitude of said curve; said cylinder housing having a wall against which said piston strikes at an end of each stroke thereby generating a distinctive amplitude in said time-dependent curve; shut-off means connected to said means for monitoring and to said means for energizing for disconnecting said means for energizing upon the occurrence of said distinctive amplitude in said time-dependent curve until the next energization of said electromagnetic excitation means by said means for energizing; and means connected to said means for monitoring for identifying specific malfunction in the operation of said pump means based on said amplitude and for generating a control signal to alter the operation of said pump means to correct said malfunction. - View Dependent Claims (16, 17)
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18. A dosing device for injecting liquids from a reservoir into an organism comprising:
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pump means for transferring said liquid from said reservoir to said organism in a selected dose, said pump means including a cylinder housing with a movable piston disposed in said cylinder housing, said pump means further including energizable electromagnetic excitation means including a stator winding for moving, if energized, said piston from a rest position in said cylinder housing through a stroke to convey said liquid through said pump means to said organism, and restoring means for returning said piston to said rest position when the electromagnetic excitation means is not energized; means arranged relative to said pump means for obtaining a signal representing a time-dependent curve of the piston motion for each stroke, including means connected to said stator winding for superimposing an a.c. signal on a d.c. energizing signal in said stator winding, an ammeter connected to said stator winding for measuring the a.c. signal after the signal has passed through said stator winding, and evaluation means connected to an output of said ammeter for differentiating the output signal of said ammeter; means connected to the output of said evaluation means for monitoring the amplitude of said curve; and means in communication with said means for monitoring the amplitude of said curve for generating a corrective signal, if needed, based on said amplitude of said curve. - View Dependent Claims (19)
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20. A dosing device for injecting liquids from a reservoir in to an organism comprising:
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pump means for transferring said liquid from said reservoir to said organism in a selected dose, said pump means including a cylinder housing with a movable piston disposed in said cylinder housing, said pump means further including energizable electromagnetic excitation means including a stator winding for moving, if energized, said piston from a rest position in said cylinder housing through a stroke to convey said liquid through said pump means to said organism and restoring means for returning said piston to said rest position when the electromagnetic excitation means is not energized; means arranged relative to said pump means for obtaining a signal representing a time-dependent curve of the piston motion for each stroke, including an ammeter connected to said stator winding, and an evaluation means having an input connected to an output of said ammeter for differentiating the output signal of said ammeter; means connected to an output of said evaluation means for monitoring the amplitude of said curve; and means in communication with said means for monitoring the amplitude of said curve for generating a corrective signal, if needed, based on said amplitude of said curve. - View Dependent Claims (21)
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Specification