Controlled-volume infusion device
First Claim
1. An infusion device for delivery of a controlled-volume dosage of a fluid to a patient, said infusion device comprising:
- a medication reservoir delivering fluid at a pressure;
a dosage reservoir having an initial, substantially empty state;
a first fluid conduit between the medication reservoir and dosage reservoir;
a one-way valve allowing fluid flow through the first fluid conduit only away from the medication reservoir;
a pressure source applying pressure higher than the medication reservoir pressure to gradually dispense fluid from the dosage reservoir;
an actuator to temporarily check the pressure source and enable the dosage reservoir to rapidly fill with a controlled volume of fluid from the medication reservoir through the first fluid conduit;
a patient connection;
a second fluid conduit between the dosage reservoir and the patient connection; and
a flow restrictor restricting the fluid flow rate from the dosage reservoir through the second fluid conduit to the patient connection, whereby the fluid flow rate is determined by the fluid pressure provided by the medication reservoir and the dosage reservoir.
6 Assignments
0 Petitions
Accused Products
Abstract
An infusion device capable of administering liquid medication at a continuous flow rate, and upon user demand delivers a controlled volume dosage of liquid medication at a higher dosage flow rate. The dosage reservoir remains empty until the user actuates it by selectively and temporarily removing the pressure source, such as a spring. During actuation, fluid rapidly flows from the medication reservoir to fill the dosage reservoir. After actuation, the pressure source exerts a higher pressure on the dosage reservoir than the medication reservoir pressure, which results in a temporary higher bolus flow rate. Thus, two distinct flow rates are achieved with one flow restrictor element.
73 Citations
26 Claims
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1. An infusion device for delivery of a controlled-volume dosage of a fluid to a patient, said infusion device comprising:
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a medication reservoir delivering fluid at a pressure;
a dosage reservoir having an initial, substantially empty state;
a first fluid conduit between the medication reservoir and dosage reservoir;
a one-way valve allowing fluid flow through the first fluid conduit only away from the medication reservoir;
a pressure source applying pressure higher than the medication reservoir pressure to gradually dispense fluid from the dosage reservoir;
an actuator to temporarily check the pressure source and enable the dosage reservoir to rapidly fill with a controlled volume of fluid from the medication reservoir through the first fluid conduit;
a patient connection;
a second fluid conduit between the dosage reservoir and the patient connection; and
a flow restrictor restricting the fluid flow rate from the dosage reservoir through the second fluid conduit to the patient connection, whereby the fluid flow rate is determined by the fluid pressure provided by the medication reservoir and the dosage reservoir. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An infusion device for delivery of a controlled-volume dosage of a fluid to a patient, said infusion device comprising:
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a medication reservoir delivering fluid at a pressure;
a dosage reservoir having an initial, substantially empty state;
a patient connection;
a 3-leg adapter providing a three-way fluid connection;
a first fluid conduit between the medication reservoir and the 3-leg adapter;
a second fluid conduit between the 3-leg adapter and the patient connection;
a third fluid conduit between the 3-leg adapter and the dosage reservoir;
a one-way valve allowing fluid flow through the first fluid conduit only from the medication reservoir to the 3-leg adapter;
a pressure source applying pressure, higher that the medication reservoir pressure, to gradually dispense the fluid from the dosage reservoir;
an actuator to temporarily check the pressure source and thereby enable the dosage reservoir to rapidly fill with a controlled volume of fluid from the medication reservoir through the first fluid conduit and third fluid conduit; and
a flow restrictor restricting the flow rate from the dosage reservoir through the second fluid conduit, whereby the flow rate delivered to the patient is determined by the fluid pressure provided by the medication reservoir and the dosage reservoir. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification