Biodegradable vehicles and delivery systems of biolgically active substances
First Claim
1. A biodegradable vehicle or delivery system comprising:
- (a) at least one biodegradable polymer; and
(b) at least one plasticizer;
said plasticizer being capable of modulating both the consistency and hydrophobicity or hydrophilicity of said biodegradable vehicle or delivery system.
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Abstract
Biodegradable vehicle and delivery systems of physiologically, pharmacologically and biologically active substance(s) (BAS) are provided. The biodegradable vehicles may be prepared by blending biodegradable polymers and plasticizers using a novel solvent evaporation method. This method involves dissolving the biodegradable polymer or copolymer and a plasticizer or mixtures of plasticizers into a volatile solvent or mixtures of volatile solvents. The volatile solvent is then removed using vacuum or at an elevated temperature or using a combination of both vacuum and elevated temperature. The biodegradable vehicle can be used as filler or spacer in the body. Biologically active substances (BAS) can be added to the biodegradable vehicle at any step during or after preparing the biodegradable vehicle, or just prior to using the biodegradable system. This biodegradable delivery system provides controlled release of the BAS over the desired period of time. The biodegradable vehicle or BAS-loaded biodegradable delivery system can be injected, implanted, smeared or applied in vivo in an animal, bird or human.
81 Citations
29 Claims
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1. A biodegradable vehicle or delivery system comprising:
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(a) at least one biodegradable polymer; and
(b) at least one plasticizer;
said plasticizer being capable of modulating both the consistency and hydrophobicity or hydrophilicity of said biodegradable vehicle or delivery system. - View Dependent Claims (2, 3, 4, 5)
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6. A biodegradable vehicle or delivery system comprising:
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(a) a combination of two biodegradable polymers, said polymers capable of modulating the degradation kinetics as well as consistency and hydrophobicity or hydrophilicity of the vehicle or delivery system; and
at least one plasticizer, said plasticizer being capable of modulating the consistency and hydrophobicity or hydrophilicity of said biodegradable vehicle or delivery system.
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7. A biodegradable vehicle or delivery system comprising:
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(a) a combination of three biodegradable polymers, said polymers capable of modulating the degradation kinetics as well as consistency and hydrophobicity or hydrophilicity of the vehicle or delivery system; and
(b) at least one plasticizer, said plasticizer being capable of modulating the consistency and hydrophobicity or hydrophilicity of said biodegradable vehicle or delivery system.
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8. (e) A biodegradable vehicle or delivery system comprising:
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(a) a combination of two biodegradable polymers, said polymers capable of modulating the degradation kinetics as well as consistency and hydrophobicity or hydrophilicity of the vehicle or delivery system; and
(b) a combination of two plasticizers, said plasticizers being capable of modulating the consistency and hydrophilicity or hydrophobicity of said biodegradable vehicle or delivery system.
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9. A biodegradable vehicle or delivery system comprising:
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(a) a combination of three biodegradable polymers, said polymers capable of modulating the degradation kinetics as well as consistency and hydrophobicity or hydrophilicity of the vehicle or delivery system; and
(b) a combination of two plasticizers, said plasticizers being capable of modulating the consistency and hydrophilicity or hydrophobicity of said biodegradable vehicle or delivery system.
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10. A biodegradable vehicle or delivery system comprising:
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(a) at least one biodegradable polymer; and
a combination of two plasticizers, said plasticizers being capable of modulating the consistency and hydrophilicity or hydrophobicity of said biodegradable vehicle or delivery system.
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11. A method of preparing a biodegradable vehicle or delivery system comprising the steps of:
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(a) selecting at least one biodegradable polymer;
(b) dissolving said polymer in at least one volatile solvent to form a solution;
(c) adding at least one plasticizer to said solution of step (b); and
(d) evaporating said solvent from the solution of step (c). - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of preparing a biodegradable vehicle or delivery system comprising the steps of:
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(a) selecting at least one biodegradable polymer (b) dissolving said polymer in at least one volatile solvent to form a solution;
(c) adding at least one plasticizer to said solution of step (b);
(d) adding at least one biologically active substance to the product of step (c); and
(e) evaporating said solvent from the product of step (d). - View Dependent Claims (21, 22, 23, 24)
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25. A method for modulating the release kinetics of a biologically active substance (BAS) in a biodegradable delivery system comprising a biodegradable polymer, a plasticizer and a BAS, said method comprising:
varying the physiochemical properties of at least one member of the group consisting of said biodegradable polymer, said plasticizer, BAS and combinations thereof, thereby modulating the release kinetics of said biologically active substance (BAS). - View Dependent Claims (26, 27, 28)
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29. A method for modulating the degradation kinetics of a biodegradable delivery vehicle comprising a biodegradable polymer, a plasticizer and optionally a biologically active substance said method comprising:
varying the physiochemical properties of at least one member of the group consisting of said biodegradable polymer, said plasticizer, optionally a BAS and combinations thereof, thereby modulating the degradation kinetics of said biodegradable vehicle.
Specification