Ambulatory infusion pump
First Claim
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1. A pulsed liquid injection device comprising:
- liquid storage container for storing liquid under a pressure greater than that required for making an injection;
a liquid metering chamber, having a predetermined capacity, for storing liquid under a pressure which is greater than that for making an injection but lower than the pressure in said first storage container;
liquid dispensing means;
a first liquid flow path between said storage container and said metering chamber;
a second liquid flow path between said metering chamber and said liquid dispensing means;
first valve means in said first liquid flow path movable between a first operating position in which said first liquid flow path is blocked and a second operating position which said first liquid flow path is open;
second valve means in said second liquid flow path movable between a first operating position in which said second liquid flow path is blocked and a second operating position in which said second liquid flow path is open;
timing means arranged, repeatedly at predetermined intervals, to (a) open said first valve means for just sufficient time to permit said liquid to flow into and fill said metering chamber and then return said first valve means to its first operating position, and subsequentially (b) open said second valve means for at least sufficient time to permit a predetermined volume of said liquid in said metering chamber to flow to said liquid dispensing means and then return said second valve means to its first operating position; and
means intermediate said first and second valve means arranged to block said second liquid flow path in the event that liquid in excess of said predetermined capacity of said metering chamber is delivered thereto.
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Abstract
A pulsed liquid injection device for injection of predetermined dosage volumes of medication at predetermined intervals of time over an extended period is described. A relatively large supply of medication is maintained in a bag under pressure, and metered portions thereof are released at time intervals by an electronically controlled metering device. The metering device includes a simple valve arrangement containing three flexible resilient elements arranged and controlled in such a way as to provide shut off of medication supply in the event of a malfunction, either electrical or mechanical.
164 Citations
19 Claims
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1. A pulsed liquid injection device comprising:
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liquid storage container for storing liquid under a pressure greater than that required for making an injection; a liquid metering chamber, having a predetermined capacity, for storing liquid under a pressure which is greater than that for making an injection but lower than the pressure in said first storage container; liquid dispensing means; a first liquid flow path between said storage container and said metering chamber; a second liquid flow path between said metering chamber and said liquid dispensing means; first valve means in said first liquid flow path movable between a first operating position in which said first liquid flow path is blocked and a second operating position which said first liquid flow path is open; second valve means in said second liquid flow path movable between a first operating position in which said second liquid flow path is blocked and a second operating position in which said second liquid flow path is open; timing means arranged, repeatedly at predetermined intervals, to (a) open said first valve means for just sufficient time to permit said liquid to flow into and fill said metering chamber and then return said first valve means to its first operating position, and subsequentially (b) open said second valve means for at least sufficient time to permit a predetermined volume of said liquid in said metering chamber to flow to said liquid dispensing means and then return said second valve means to its first operating position; and means intermediate said first and second valve means arranged to block said second liquid flow path in the event that liquid in excess of said predetermined capacity of said metering chamber is delivered thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A valve arrangement adapted for addition to a pulsed liquid injection system, of which it then forms part, the arrangement comprising:
- a housing having a liquid flow path therethrough and containing a liquid metering chamber intermediate the ends thereof;
first valve means in said flow path upstream of said metering chamber and second valve means in said flow path downstream of said metering chamber, said first and second valve means being operatively movable between respective first positions which block said flow path and second positions in which said flow path is open; and
sensing means in said flow path operatively connected to third valve means arranged to block said liquid flow path in the event that in excess of a predetermined volume of liquid is exhausted from said metering chamber. - View Dependent Claims (16, 17, 18, 19)
- a housing having a liquid flow path therethrough and containing a liquid metering chamber intermediate the ends thereof;
Specification