Fluid dispensing device
First Claim
1. An ambulatory fluid drug dispensing device comprising a reservoir for a liquid to be administered parenterally to a patient, means for introducing liquid in the reservoir, means for placing the liquid in the reservoir under constant pressure for dispensing the liquid from the device, said means for placing including a spring for applying a constant force to the liquid in the reservoir and means for tensioning said spring to initially apply the constant force on the liquid in the reservoir after the liquid has been introduced in the reservoir and flow control means for adjustably controlling the flow rate of the liquid dispensed from the device, said flow control means comprising means defining a elongated passage through which liquid from said reservoir can be flowed to an outlet of said device and means for changing the length of said elongated passage through which the liquid is flowed to thereby change the flow rate of the liquid through the passage.
1 Assignment
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Accused Products
Abstract
A fluid dispensing device useful as an inexpensive, light-weight ambulatory disposal drug infusion pump comprises a flexible reservoir for liquid to be administered parenterally to a patient, a mechanism for placing the liquid in the reservoir under a constant pressure for dispensing the liquid from the device, a distal septum for introducing liquid in the reservoir, and a flow control mechanism for adjustably controlling the flow rate of the liquid dispensed from the device.
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Citations
16 Claims
- 1. An ambulatory fluid drug dispensing device comprising a reservoir for a liquid to be administered parenterally to a patient, means for introducing liquid in the reservoir, means for placing the liquid in the reservoir under constant pressure for dispensing the liquid from the device, said means for placing including a spring for applying a constant force to the liquid in the reservoir and means for tensioning said spring to initially apply the constant force on the liquid in the reservoir after the liquid has been introduced in the reservoir and flow control means for adjustably controlling the flow rate of the liquid dispensed from the device, said flow control means comprising means defining a elongated passage through which liquid from said reservoir can be flowed to an outlet of said device and means for changing the length of said elongated passage through which the liquid is flowed to thereby change the flow rate of the liquid through the passage.
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16. An ambulatory fluid drug dispensing device comprising a flexible reservoir for liquid to be administered parenterally to a patient, a spring for placing the liquid in said reservoir under a constant pressure for dispensing said liquid from the device, means for introducing liquid in said reservoir, means for tensioning said spring after introduction of liquid in the reservoir to apply said constant pressure to the liquid which has been introduced into said reservoir and flow control means for adjustably controlling the flow rate of the liquid dispensed from the device.
Specification