Medical devices based on oxidized cellulose

Patent metadata

Field	Value
Publication number	US-10040871-B2
Application number	US-201313927311-A
Country	US
Kind code	B2
Filing date	Jun 26, 2013
Priority date	Jun 28, 2012
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

A process for dissolving modified cellulose includes contacting modified cellulose with a solvent in a mixture to form swelled modified cellulose and then contacting the mixture with a salt to dissolve the swelled modified cellulose. The dissolved modified cellulose is used to form at least one of a predictably degrading coating, film, or a fiber.

First claim

What is claimed is:

1. A process comprising:
contacting an oxidized cellulose with a solvent under an inert atmosphere to form a swelled oxidized cellulose;
adjusting the swelled oxidized cellulose to a first temperature in a vessel which is initially heated to the first temperature from about 115° C. to about 145° C.;
contacting the swelled oxidized cellulose with a salt under the inert atmosphere to form an oxidized cellulose solution;
adjusting the oxidized cellulose solution to a second temperature from about 90° C. to about 120° C.; and
forming at least one of a coating or a film from the oxidized cellulose solution.

2. The process according to claim 1 , wherein the at least one of the coating or the film is formed by evaporating the solvent from the solution.

3. The process according to claim 1 , wherein the solvent is selected from the group consisting of N,N-Dimethylacetamide, N-methyl-2-pyrrolidinone, and combinations thereof.

4. The process according to claim 1 , wherein the salt is selected from the group consisting of lithium halides, sodium halides, potassium halides, and combinations thereof.

5. The process according to claim 1 , wherein the at least one of the coating or the film includes a final oxidized cellulose having a degree of oxidation from about 80% to about 120% of a degree of oxidation of the oxidized cellulose before contacting with the solvent.

6. The process according to claim 5 , wherein the at least one of the coating or the film includes a final oxidized cellulose having a molecular weight from about 80% to about 120% of the molecular weight of the oxidized cellulose before contacting with the solvent.

7. The process according to claim 1 , further comprising:
contacting the oxidized cellulose solution with at least one biocompatible plasticizer.

8. The process according to claim 7 , wherein the at least one biocompatible plasticizer is selected from lecithin, dibutyl sebacate, citric acid, polyethylene glycol, polypropylene glycol, or combinations thereof.

9. A process comprising:
contacting an oxidized cellulose with a solvent under an inert atmosphere to form a swelled oxidized cellulose;
adjusting the swelled oxidized cellulose to a first temperature in a vessel which is initially heated to the first temperature from about 115° C. to about 145° C.;
contacting the swelled oxidized cellulose with a salt under the inert atmosphere to form an oxidized cellulose solution;
adjusting the oxidized cellulose solution to a second temperature from about 90° C. to about 120° C.; and
forming at least one of a coating or a film from the oxidized cellulose solution,
wherein the at least one of the coating or the film includes a final oxidized cellulose having a degree of oxidation from about 80% to about 120% of a degree of oxidation of the oxidized cellulose before contacting with the solvent.

10. The process according to claim 9 , wherein the at least one of the coating or the film includes a final oxidized cellulose having a molecular weight from about 80% to about 120% of the molecular weight of the oxidized cellulose before contacting with the solvent.

11. The process according to claim 1 , wherein the salt is present in amounts from about 0.25% by weight to about 2% by weight of the oxidized cellulose.

12. The process according to claim 9 , wherein the salt is present in amounts from about 0.25% by weight to about 2% by weight of the oxidized cellulose.

Assignees

• Confluent Surgical Inc
• Covidien Lp

Inventors

• Tramontano Valentino
• Blaskovich Phillip
• Ohri Rachit
• Kennedy Joshua
• Farooqi Sajida

Classifications

• A61L27/58

  Materials at least partially resorbable by the body · CPC title

• A61L27/34

  Macromolecular materials · CPC title

• C08B15/02 Primary

  Oxycellulose; Hydrocellulose; {Cellulosehydrate, e.g. microcrystalline cellulose} · CPC title

• A61L27/20 Primary

  Polysaccharides · CPC title

• C08L1/02

  Cellulose; Modified cellulose · CPC title