Subcutaneous drug delivery device with improved filling system
First Claim
1. A subcutaneous drug delivery device comprising:
- a housing having an internal reservoir and an expandable chamber disposed relative to the reservoir, a drug delivery needle extending from the housing for penetration of the skin of a subject, the needle having an outlet for drug delivery, a fluid path defined between the delivery needle outlet and the reservoir, means for providing a gas at a controllable rate into the expandable chamber, and a flow regulating chamber, in communication with the fluid path, which is capable of volumetric changes in response to temperature and/or pressure changes.
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Accused Products
Abstract
A subcutaneous drug delivery device having a housing having an internal reservoir in communication with a drug delivery needle via a fluid path. An expandable chamber disposed adjacent to the reservoir forces drug from the reservoir to the needle when supplied with a gas. A flow regulating chamber, in communication with the fluid path, is capable of volumetric changes in response to temperature and/or pressure changes. An increase in the volume of the flow regulating chamber increases flow resistance to the needle and thereby counteracts the corresponding increase in delivery rate resulting from the expansion of the expandable chamber due to the same volumetric changes in response to temperature and/or pressure.
The device also includes an improved filling system that enables the reservoir within the device to be filled with drug from a source without regard to filling position and with a decreased risk of injury from needles. Moreover, the filling system provides an accurate measure of drug transferred into the device thus enabling patients to fill the devices and to ensure proper dosage upon delivery.
1006 Citations
7 Claims
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1. A subcutaneous drug delivery device comprising:
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a housing having an internal reservoir and an expandable chamber disposed relative to the reservoir, a drug delivery needle extending from the housing for penetration of the skin of a subject, the needle having an outlet for drug delivery, a fluid path defined between the delivery needle outlet and the reservoir, means for providing a gas at a controllable rate into the expandable chamber, and a flow regulating chamber, in communication with the fluid path, which is capable of volumetric changes in response to temperature and/or pressure changes. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification