Microneedles with improved open channel cross-sectional geometries
First Claim
1. A drug delivery device, comprising:
- a reservoir containing a liquid drug formulation; and
a microneedle assembly in fluid communication with the reservoir, the microneedle assembly including a support defining an upper surface and a lower surface, the microneedle assembly further including a plurality of microneedles extending from the lower surface, each microneedle defining an open channel for receiving the drug formulation, the open channel having a normalized hydraulic radius ranging from 0.1 to 0.8, the open channel further having a liquid-to-solid interfacial energy and a liquid-to-vapor interfacial energy when a fixed volume of the drug formulation is received therein,wherein the drug formulation and a cross-sectional geometry of the open channel is selected and configured based on an interaction between the drug formulation and the open channel such that the liquid-to-solid interfacial energy exceeds the liquid-to-vapor interfacial energy as a fluid length of the fixed volume of drug formulation is increased within the open channel.
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Abstract
In one aspect a drug delivery device may include a reservoir containing a liquid drug formulation and a microneedle assembly in fluid communication with the reservoir. The microneedle assembly may include a plurality of microneedles, with each microneedle defining an open channel for receiving a drug formulation. The open channel may have a normalized hydraulic radius ranging from about 0.1 to about 0.8. The open channel may also have a liquid-to-solid interfacial energy and a liquid-to-vapor interfacial energy when a fixed volume of the drug formulation is received therein. In addition, the drug formulation and a cross-sectional geometry of the open channel may be selected and configured such that the liquid-to-solid energy exceeds the liquid-to-vapor energy as the length of the fixed volume of drug formulation is increased within the open channel.
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Citations
30 Claims
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1. A drug delivery device, comprising:
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a reservoir containing a liquid drug formulation; and a microneedle assembly in fluid communication with the reservoir, the microneedle assembly including a support defining an upper surface and a lower surface, the microneedle assembly further including a plurality of microneedles extending from the lower surface, each microneedle defining an open channel for receiving the drug formulation, the open channel having a normalized hydraulic radius ranging from 0.1 to 0.8, the open channel further having a liquid-to-solid interfacial energy and a liquid-to-vapor interfacial energy when a fixed volume of the drug formulation is received therein, wherein the drug formulation and a cross-sectional geometry of the open channel is selected and configured based on an interaction between the drug formulation and the open channel such that the liquid-to-solid interfacial energy exceeds the liquid-to-vapor interfacial energy as a fluid length of the fixed volume of drug formulation is increased within the open channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 29)
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11. A drug delivery device, comprising:
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a reservoir configured to initially retain a drug formulation; and a microneedle assembly in fluid communication with the reservoir, the microneedle assembly being configured such that a passive fluid flow of the drug formulation is directed through the microneedle assembly, the microneedle assembly including a support defining an upper surface and a lower surface, the microneedle assembly further including a plurality of microneedles extending from the lower surface, each microneedle defining an open channel for receiving the drug formulation, the open channel having a normalized hydraulic radius ranging from 0.1 to 0.8, the open channel further having a liquid-to-solid interfacial energy and a liquid-to-vapor interfacial energy when a fixed volume of the drug formulation is received therein, wherein the drug formulation and a cross-sectional geometry of the open channel is selected and configured based on an interaction between the drug formulation and the open channel such that the liquid-to-solid interfacial energy exceeds the liquid-to-vapor interfacial energy as a fluid length of the fixed volume of drug formulation is increased within the open channel. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 30)
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24. A drug delivery device, comprising:
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a reservoir containing a liquid drug formulation; and a microneedle assembly in fluid communication with the reservoir, the microneedle assembly including a support defining an upper surface and a lower surface, the microneedle assembly further including a plurality of microneedles extending from the lower surface, each microneedle defining an open channel for receiving the drug formulation and having a skin contact area ranging from about 1,500 um2 to about 262,500 um2, the open channel having a liquid-to-solid interfacial energy and a liquid-to-vapor interfacial energy when a fixed volume of the drug formulation is received therein, wherein a relationship between a cross-sectional geometry of the open channel and a contact angle defined between the open channel and the drug formulation is selected and configured such that the liquid-to-solid interfacial energy exceeds the liquid-to-vapor interfacial energy as a fluid length of the fixed volume of drug formulation is increased within the open channel. - View Dependent Claims (25, 26, 27, 28)
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Specification