Drug delivery devices, and methods of use
First Claim
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1. A biomedical device comprising:
- (a) a polymeric or hydrogel substrate; and
(b) a surface layer comprising a multiplicity of C10 to C22 unbranched alkyl molecules, wherein;
(1) the multiplicity of alkyl molecules define a multiplicity of spaces therebetween;
(2) each member of the multiplicity of alkyl molecules possesses a proximal end and a distal end, the proximal end being covalently linked to the substrate; and
(3) the surface layer has an ordered state and a less ordered state, the surface layer being reversibly convertible to the less ordered state from the ordered state in response to an effective amount of sound or thermal energy.
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Abstract
The present invention provides biomedical devices, such as implantable drug delivery devices that possess a surface layer adapted to retain, and controllably release, drug molecules for administration to a subject. The present invention also provides methods of delivering a drug to a subject, the methods utilizing biomedical devices of the invention.
41 Citations
17 Claims
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1. A biomedical device comprising:
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(a) a polymeric or hydrogel substrate; and
(b) a surface layer comprising a multiplicity of C10 to C22 unbranched alkyl molecules, wherein;
(1) the multiplicity of alkyl molecules define a multiplicity of spaces therebetween;
(2) each member of the multiplicity of alkyl molecules possesses a proximal end and a distal end, the proximal end being covalently linked to the substrate; and
(3) the surface layer has an ordered state and a less ordered state, the surface layer being reversibly convertible to the less ordered state from the ordered state in response to an effective amount of sound or thermal energy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
(a) within the substrate;
(b) within the multiplicity of spaces defined by the unbranched alkyl molecules; and
(c) within the substrate and within the multiplicity of spaces defined by the unbranched alkyl molecules.
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7. The device of claim 6, wherein the multiplicity of drug molecules is disposed within the multiplicity of spaces defined by the unbranched alkyl molecules.
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8. The device of claim 6, wherein said multiplicity of drug molecules comprises molecules of more thanone type of drug.
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9. The device of claim 6, wherein said drug is selected from the group of drugs consisting of insulin, estrogens, androgens, hypnotics, antipsychotics, narcotics and diuretics.
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10. The device of claim 1 further comprising a multiplicity of effector molecules wherein each member of the multiplicity of effector molecules is covalently attached to the distal end of a C10 to C22 unbranched alkyl molecule of the surface layer.
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11. The device of claim 10, wherein the effector molecule is selected from the group of effector molecules consisting of protein, lipid, carbohydrate, nucleic acid and peptide.
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12. The device of claim 1, wherein the device is an implantable medical device.
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13. The device of claim 2, wherein the device is an implantable medical device.
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14. The device of claim 1 or claim 2, wherein the ordered state of the surface layer forms a crystalline layer characterized by Fourier Infrared Peak Frequencies at 2850+/−
- 2 cm−
1 and 2920+/−
2 cm−
1.
- 2 cm−
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15. A method of making a biomedical device comprising a surface layer, said method comprising the steps of:
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(a) disposing a multiplicity of drug molecules within a polymeric or hydrogel substrate; and
(b) covalently attaching a multiplicity of C10 to C22 unbranched alkyl molecules to the surface of the substrate by forming a covalent linkage between an end group on each member of the multiplicity of C10 to C22 unbranched alkyl molecules and a reactive group on the substrate, thereby forming a surface layer on the substrate wherein;
(1) the multiplicity of alkyl molecules define a multiplicity of spaces therebetween;
(2) each member of the multiplicity of alkyl molecules possesses a proximal end and a distal end, the proximal end being covalently linked to the substrate; and
(3) the surface layer has an ordered state and a less ordered state, the surface layer being reversibly convertible to the less ordered state from the ordered state in response to an effective amount of sound or thermal energy.
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16. A method of delivering a drug to a subject, said method comprising the steps of:
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(a) introducing into a subject a device comprising;
(1) a polymeric or hydrogel substrate comprising a multiplicity of drug molecules; and
(2) a surface layer comprising a multiplicity of C10 to C22 unbranched alkyl molecules, wherein;
(i) the multiplicity of alkyl molecules define a multiplicity of spaces therebetween;
(ii) a multiplicity of drug molecules are disposed within said spaces;
(iii) each member of the multiplicity of alkyl molecules possesses a proximal end and a distal end, the proximal end being covalently linked to the substrate; and
(iv) the surface layer has an ordered state and a less ordered state, the surface layer being reversibly convertible to the less ordered state from the ordered state in response to an effective amount of sound or thermal energy; and
(b) subjecting the device to an amount of sound or thermal energy effective to induce release of the drug molecules from the surface layer. - View Dependent Claims (17)
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Specification