Controlled release device and method
First Claim
Patent Images
1. A device for dispensing one or more active agents, the device including:
- a housing having one or more openings;
an active agent or agents located within the housing;
a driving means located within, or at a closed end of, the housing, said driving means including an expandable material; and
one or more fluid conveying passages adapted to convey fluid from outside the housing to the driving means;
wherein said passages allow restricted but controlled conveyance of fluid, such as body fluid, to the expandable material but not so restricted as to provide semi-permeable flow and further wherein in use said fluid leads to expansion of said expandable material with subsequent displacement of said active agent or agents and thus subsequent dispensing of said agent or agents.
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0 Petitions
Accused Products
Abstract
A device for dispensing one or more active agents, the device including: a housing (112) having an opening; at least one active agent (118) located within the housing; a driving means (124) located within, or at the closed end of the housing, including an expandable material; and one or more permeable fluid conveying passage(s) adapted to convey fluid from outside the housing to the driving means.
83 Citations
38 Claims
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1. A device for dispensing one or more active agents, the device including:
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a housing having one or more openings; an active agent or agents located within the housing; a driving means located within, or at a closed end of, the housing, said driving means including an expandable material; and one or more fluid conveying passages adapted to convey fluid from outside the housing to the driving means;
wherein said passages allow restricted but controlled conveyance of fluid, such as body fluid, to the expandable material but not so restricted as to provide semi-permeable flow and further wherein in use said fluid leads to expansion of said expandable material with subsequent displacement of said active agent or agents and thus subsequent dispensing of said agent or agents. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A dispensing device for dispensing one or more active agents, the device including:
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a housing having one or more openings; an active agent or agents located within the housing; a driving means located within or at a closed end of the housing, said driving means including an expandable material; and one or more capillary passages adapted to convey fluid from outside the housing to the driving means;
wherein said passages allow restricted but controlled conveyance of fluid, such as body fluid, to the expandable material but not so restricted as to provide semi-permeable flow and further wherein in use said fluid leads to expansion of said expandable material with subsequent displacement of said active agent or agents and thus subsequent dispensing of said agent or agents. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A device for dispensing one or more active agents, the device including:
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a housing having an opening and being formed at least in part from a substantially liquid impervious material; an active agent or agents located within the liquid impervious housing; a driving means located within, or at a closed end of, the housing, the driving means including an expandable material; said housing including a portion having a plurality of pores formed therein to convey fluid from outside the housing to the driving means, wherein in use said fluid leads to expansion of said expandable material with subsequent displacement of said active agent or agents and thus subsequent dispensing of said agent or agents. - View Dependent Claims (25, 26)
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27. A device for dispensing one or more active agents, the device including:
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a housing having an opening; at least one active agent located within the housing; a driving means located within, or at the closed end of, the housing, the driving means including an expandable material; one or more fluid conveying passages formed on the inner surface of the housing adapted to convey fluid from the outside of the housing to the driving means; and a constrained edge wick which extends the full length of the inner surface of the housing so that it contacts the edges of all layers in the stack loaded in the housing, the capacity of the edge wick to deliver water to each expanding layer being substantially less than the capacity of the layer to absorb water. - View Dependent Claims (28, 29, 30, 31, 32)
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33. A dispensing device for dispensing one or more active agents the device including:
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a housing having an opening; at least one active agent located within the housing; a driving means located within or at the closed end of the housing, the driving means including an expandable material; one or more capillary channels formed on the inner surface of the housing adapted to convey fluid from the outside of the housing to the driving means; and a constrained edge wick which extends the full length of the inner surface of the housing so that it contacts the edges of all layers in the stack in the housing, the capacity of the constrained edge wick to deliver water to each expanding layer being substantially less than the capacity of the layer to absorb water. - View Dependent Claims (34, 35, 36, 37, 38)
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Specification