Infusion device having piston operated driving mechanism and positive pressure reservoir
First Claim
1. An infusion medium delivery device comprising:
- a reservoir for containing infusion medium under positive pressure;
a drive device having;
an inlet for receiving infusion medium under positive pressure;
a piston channel for communication of infusion medium received by the inlet;
a coil surrounding the piston channel;
an armature disposed adjacent the coil, on one side of the piston channel;
an outlet chamber disposed adjacent the coil, on the opposite side of the piston channel relative to the armature for receiving infusion medium from the channel;
a piston located within the piston channel and moveable axially within the piston channel for allowing infusion medium to enter the outlet chamber under positive pressure; and
an outlet in flow communication with the outlet chamber, for discharging a metered amount of infusion medium from the outlet chamber.
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Accused Products
Abstract
A piston-type drive mechanism in combination with a positive pressure reservoir for delivery of infusion medium. A coil capable of being electrically activated to provide an electromagnetic field. The coil surrounds a piston channel extending in an axial direction. The piston channel provides a passage for communication of infusion medium from the positive pressure reservoir to an outlet chamber. A piston is located within the piston channel and is moveable axially within the channel to a forward position. The piston is moved toward a retracted position, when the coil is not energized. As the piston is moved to its forward position, pressure moves a valve member into an open position. When the valve member is in the open position, medium from the piston chamber is discharged into the outlet chamber. An outlet is provided in flow communication with the outlet chamber, for discharging infusion medium from the outlet chamber.
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Citations
21 Claims
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1. An infusion medium delivery device comprising:
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a reservoir for containing infusion medium under positive pressure;
a drive device having;
an inlet for receiving infusion medium under positive pressure;
a piston channel for communication of infusion medium received by the inlet;
a coil surrounding the piston channel;
an armature disposed adjacent the coil, on one side of the piston channel;
an outlet chamber disposed adjacent the coil, on the opposite side of the piston channel relative to the armature for receiving infusion medium from the channel;
a piston located within the piston channel and moveable axially within the piston channel for allowing infusion medium to enter the outlet chamber under positive pressure; and
an outlet in flow communication with the outlet chamber, for discharging a metered amount of infusion medium from the outlet chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An infusion device for delivery of infusion medium comprising:
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a reservoir for containing infusion medium under positive pressure;
a drive device having;
an inlet for receiving infusion medium under positive pressure;
at least one coil capable of being electrically activated to provide an electromagnetic field, the at least one coil surrounding an axial piston channel that provides a passage for communication of infusion medium received by the inlet;
an armature disposed adjacent the coil, on one side of the axial piston channel and moveable in a first direction relative to the coil, in response to the electromagnetic field produced by an activation of the coil;
a piston located within the piston channel and moveable axially within the channel in the first direction, in response to movement of the armature;
an outlet chamber disposed adjacent the coil, on the opposite side of the piston channel relative to the armature for receiving infusion medium from the piston channel under positive pressure, upon movement of the piston in the first direction; and
an outlet in flow communication with the outlet chamber, for discharging infusion medium from the outlet chamber.
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19. An infusion device for delivering infusion medium, the device comprising:
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a housing having an outlet through which infusion medium may be discharged;
a positive pressure reservoir disposed within the housing, for containing a volume of infusion medium under positive pressure;
a control circuit for providing drive control signals;
a drive mechanism disposed within the housing, for metering infusion medium out the outlet, in response to drive control signals from the control circuit; and
a power source disposed within the housing, for providing power to the control circuit and drive mechanism;
wherein the drive mechanism comprises;
an inlet for receiving infusion medium from the reservoir under positive pressure;
at least one coil capable of being electrically activated to provide an electromagnetic field in response to a signal from the control circuit, the at least one coil surrounding an axial piston channel that provides a passage for communication of infusion medium received by the inlet;
an armature disposed adjacent the coil, on one side of the axial channel and moveable in a first direction relative to the coil, in response to the electromagnetic field produced by an activation of the coil;
a piston located within the piston channel of the coil and moveable axially within the channel in the first direction, in response to movement of the armature;
an outlet chamber disposed adjacent the coil, on the opposite side of the piston channel relative to the armature for receiving infusion medium, from the piston channel, upon movement of the piston in the first direction; and
an outlet port in flow communication with the outlet chamber and the housing outlet, for discharging medium from the outlet chamber, through the housing outlet.
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20. A method or delivery of infusion medium comprising:
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providing at least one coil surrounding a piston channel;
providing a piston through the piston channel;
providing an armature on one side of the coil, transverse to the piston;
receiving infusion medium under positive pressure through an inlet disposed on the armature side of a coil;
urging the piston and armature toward a retracted position to form a piston chamber between one end of the piston and a valve member;
filling the piston chamber with infusion medium by passing a volume of the infusion medium received on the armature side of the coil from the inlet through the piston channel to the piston chamber;
electrically activating the coil to provide an electromagnetic field to move the armature and piston toward a forward position, moving the piston toward the forward position under the force of the electromagnetic field to compress the volume of the piston chamber and force the valve to an opened position;
discharging infusion medium from the piston chamber, through the opened valve and into an outlet chamber, upon the piston being moved to the forward position; and
delivering the infusion medium discharged from the outlet chamber through an outlet port. - View Dependent Claims (21)
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Specification