Biodegradable in-situ forming implants and methods of producing the same
First Claim
1. A method of forming a solid, biodegradable implant in-situ, in a body, comprising:
- (a) dissolving a biocompatible, water-insoluble, biodegradable thermoplastic polymer in a biocompatible, water-soluble organic solvent to form a composition;
the organic solvent being capable of dissipating or diffusing into a body fluid upon placement within a body tissue;
and the thermoplastic polymer being selected from the group consisting of;
(i) a copolymer of a biodegradable, water-insoluble monomer or polymer and a biodegradable, water-soluble monomer or polymer, wherein the amount of water-insoluble monomer or polymer is sufficient to render the copolymer water-insoluble;
(ii) a copolymer of polyethylene glycol with polylactide, polyglycolide or polycaprolactone, or a terpolymer thereof;
(iii) a copolymer of lactide with glycolide or caprolactone, or a terpolymer thereof;
(iv) a copolymer of lactide with a carbonate; and
(v) a polyanhydride; and
(b) placing the composition into an implant site within the body; and
(c) allowing the organic solvent to dissipate or diffuse into body fluid, and the thermoplastic polymer to coagulate or solidify to produce the biodegradable solid implant;
wherein the proportion of polymer in solvent and the molecular weight of the polymer are effective to provide said dissipation or diffusion and said coagulation.
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Abstract
A biodegradable polymer is provided for use in providing syringeable, in-situ forming, solid biodegradable implants for animals. The polymer is placed into the animal in liquid form and cures to form the implant in-situ. A thermoplastic system to form said implant comprises the steps of dissolving a non-reactive polymer in biocompatible solvent to form a liquid, placing the liquid within the animal, and allowing the solvent to dissipate to produce the implant. An alternative, thermosetting system comprises mixing together effective amounts of a liquid acrylic ester terminated, biodegradable prepolymer and a curing agent, placing the liquid mixture within an animal and allowing the prepolymer to cure to form the implant. Both systems provide a syringeable, solid biodegradable delivery system by the addition of an effective level of biologically active agent to the liquid before injection into the body.
345 Citations
43 Claims
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1. A method of forming a solid, biodegradable implant in-situ, in a body, comprising:
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(a) dissolving a biocompatible, water-insoluble, biodegradable thermoplastic polymer in a biocompatible, water-soluble organic solvent to form a composition;
the organic solvent being capable of dissipating or diffusing into a body fluid upon placement within a body tissue;and the thermoplastic polymer being selected from the group consisting of; (i) a copolymer of a biodegradable, water-insoluble monomer or polymer and a biodegradable, water-soluble monomer or polymer, wherein the amount of water-insoluble monomer or polymer is sufficient to render the copolymer water-insoluble; (ii) a copolymer of polyethylene glycol with polylactide, polyglycolide or polycaprolactone, or a terpolymer thereof; (iii) a copolymer of lactide with glycolide or caprolactone, or a terpolymer thereof; (iv) a copolymer of lactide with a carbonate; and (v) a polyanhydride; and (b) placing the composition into an implant site within the body; and (c) allowing the organic solvent to dissipate or diffuse into body fluid, and the thermoplastic polymer to coagulate or solidify to produce the biodegradable solid implant; wherein the proportion of polymer in solvent and the molecular weight of the polymer are effective to provide said dissipation or diffusion and said coagulation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A pharmaceutical composition for forming a biodegradable implant in-situ within a body, comprising:
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an effective amount of a biocompatible, water-insoluble, biodegradable thermoplastic polymer dissolved in an effective amount of a biocompatible, water-soluble organic solvent;
wherein,the solvent is capable of dissipating or diffusing into a body fluid and the polymer is capable of coagulating or solidifying upon contact with body fluid; the thermoplastic polymer is selected from the group consisting of; (i) a copolymer of a biodegradable, water-insoluble monomer or polymer and a biodegradable, water-soluble monomer or polymer, wherein the amount of water-insoluble monomer or polymer is sufficient to render the copolymer water-insoluble; (ii) a copolymer of polyethylene glycol with polylactide, polyglycolide or polycaprolactone, or a terpolymer thereof; (iii) a copolymer of lactide with glycolide or caprolactone, or a terpolymer thereof; (iv) a copolymer of lactide with a carbonate; and (v) a polyanhydride; and the amounts of the polymer and the solvent and the polymer molecular weight in the pharmaceutical composition are effective to form a coherent, solid implant in situ when the pharmaceutical composition contacts body fluid. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 43)
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19. A method of forming a solid, biodegradable implant in-situ, in a body, comprising:
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(a) dissolving a water-insoluble, biodegradable thermoplastic polymer a biocompatible, water-soluble organic solvent to form a composition;
the organic solvent being capable of dissipating or diffusing into a body fluid upon placement within a body tissue;wherein the organic solvent is comprised of a mixture of a first organic solvent capable of dissolving the polymer, and a second organic solvent incapable or less capable than the first organic solvent of dissolving the thermoplastic polymer;
said first and second solvents included in said mixture at a ratio such that the thermoplastic polymer is soluble therein and coagulates to form a solid implant upon placing the composition within the body and the dissipation or diffusion of the solvent into body fluid; and(b) placing the composition into an implant site within the body; and (c) allowing the organic solvent to dissipate or diffuse into the body fluid, and the thermoplastic polymer to coagulate or solidify to produce the biodegradable, solid implant; wherein the proportion of polymer in solvent and the molecular weight of the polymer are effective to provide said dissipation or diffusion and said coagulation. - View Dependent Claims (20, 21)
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33. A pharmaceutical composition for forming a solid biodegradable implant in situ within a body, comprising:
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an effective amount of a biocompatible, water-insoluble, biodegradable thermoplastic polymer dissolved in an effective amount of a biocompatible, water-soluble organic solvent;
wherein the solvent is capable of dissipating or diffusing into a body fluid and the thermoplastic polymer is capable of coagulating or solidifying upon contact with body fluid; andthe organic solvent is a mixture of a first organic solvent capable of dissolving the thermoplastic polymer, and a second organic solvent incapable or less capable than the first solvent of dissolving the thermoplastic polymer;
said first and second solvents included in said mixture at a ratio such that the thermoplastic polymer is soluble therein, and coagulates to form a coherent solid implant upon placement of the composition within the body;and the amounts of the polymer and the solvent and the polymer molecular weight in the composition are effective to form the coherent, solid implant in situ when the composition contacts body fluid. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification