Patient-controlled drug administration device
First Claim
1. A device for the administration of a liquid therapeutic agent to a patient, comprising:
- a housing defining a fluid flow conduit having an upstream portion and a downstream portion;
chamber in the housing having an inlet lumen in fluidcommunication with the upstream portion, and first and second outlet lumens separately in communication with the downstream portion;
a check valve in fluid communication with the second outlet lumen that is responsive to a predetermined cracking pressure to allow fluid flow from the second outlet lumen to the downstream portion; and
a resilient diaphragm disposed as a sealing closure for the chamber and movable between a compressed position when the chamber is voided of the agent and a decompressed position when the chamber is filled with the agent;
whereby the diaphragm is moved from the compressed position to the decompressed position by the force of the agent filling the chamber from the inlet lumen, during which filling some of the agent flows out of the chamber through the first outlet lumen; and
whereby the cracking pressure is created in the second outlet lumen in response to the movement of the diaphragm from the decompressed position to the compressed position, thereby allowing the agent to flow out of the chamber through the second outlet lumen.
6 Assignments
0 Petitions
Accused Products
Abstract
A PCA device includes a fluid conduit having an upstream portion and a downstream portion, a first flow-restricting orifice in the upstream portion, a second flow-restricting orifice in the downstream portion, a pressure-responsive check valve in the downstream portion in parallel with the second flow-restricting orifice, and a bolus dose delivery mechanism including a chamber in fluid communication between the upstream portion and the downstream portion. Continuous flow is provided through the first flow-restricting orifice, the chamber, and the second flow-restrictive orifice, the continuous flow serving to fill the chamber at a controlled rate through the first flow-restrictive orifice. The bolus dose delivery mechanism is manually actuable to express the contents of the chamber through the check valve to supplement the continuous flow through the downstream portion. The bolus dose delivery mechanism includes a resilient diaphragm that forms a sealed closure for the chamber. The diaphragm is movable from a decompressed position to a compressed position by a plunger that directly engages the diaphragm, and it is restored to the decompressed position by the flow of fluid into the chamber.
132 Citations
20 Claims
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1. A device for the administration of a liquid therapeutic agent to a patient, comprising:
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a housing defining a fluid flow conduit having an upstream portion and a downstream portion; chamber in the housing having an inlet lumen in fluid communication with the upstream portion, and first and second outlet lumens separately in communication with the downstream portion; a check valve in fluid communication with the second outlet lumen that is responsive to a predetermined cracking pressure to allow fluid flow from the second outlet lumen to the downstream portion; and a resilient diaphragm disposed as a sealing closure for the chamber and movable between a compressed position when the chamber is voided of the agent and a decompressed position when the chamber is filled with the agent; whereby the diaphragm is moved from the compressed position to the decompressed position by the force of the agent filling the chamber from the inlet lumen, during which filling some of the agent flows out of the chamber through the first outlet lumen; and whereby the cracking pressure is created in the second outlet lumen in response to the movement of the diaphragm from the decompressed position to the compressed position, thereby allowing the agent to flow out of the chamber through the second outlet lumen. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for the administration of a liquid therapeutic agent to a patient, comprising:
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a housing defining a fluid flow conduit having an upstream portion and a downstream portion; a chamber in the housing having an inlet lumen in fluid communication with the upstream portion, and first and second outlet lumens separately in communication with the downstream portion; a check valve in fluid communication with the second outlet lumen that is responsive to a predetermined cracking pressure to allow fluid flow from the second outlet lumen to the downstream portion; and a bolus dose delivery mechanism that is selectively actuable to (a) apply a pressure to the chamber that is at least equal to the cracking pressure to express a predetermined volume of the agent from the chamber through the second outlet lumen and the check valve, and (b) allow a refilling of the chamber with the agent through the first inlet lumen while also allowing a continuous flow of the agent from the chamber through the first outlet lumen. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A system for the delivery of a liquid therapeutic agent to a patient, comprising:
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a pressurized source for the agent; and a patient-controllable delivery device having an upstream conduit portion in fluid communication with the source and a downstream conduit portion in fluid communication with a delivery conduit, the device comprising; a chamber having an inlet lumen in fluid communication with the upstream portion, and first and second outlet lumens separately in communication with the downstream portion; a check valve in fluid communication with the second outlet lumen that is responsive to a predetermined cracking pressure to allow fluid flow from the second outlet lumen to the downstream portion; and a bolus dose delivery mechanism that is selectively actuable to (a) apply a pressure to the chamber that is at least equal to the cracking pressure to express a predetermined volume of the agent from the chamber through the second outlet lumen and the check valve, and (b) allow a refilling of the chamber with the agent through the first inlet lumen while also allowing a continuous flow of the agent from the chamber through the first outlet lumen. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification