Medical devices containing dry spun non-wovens of poly-4-hydroxybutyrate and copolymers
US10227718B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 2011 |
| Grant date | Mar 12, 2019 |
| Priority date | — |
| Expiry date | Apr 23, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/608
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Continuous processing methods for making absorbable polymeric dry spun non-wovens with one or more of the following properties: high burst strength, fine fibers of average diameter from 0.01 μm to 50 μm, and thickness from 10 μm to 10 mm, have been developed. Improved fiber cohesion is made possible by controlling the tackiness of the fibers of the non-woven during web collection. The polymer is preferably a polyhydroxyalkanoate, more preferably, a 4-hydroxybutyrate polymer or copolymer. A non-woven of poly-4-hydroxybutyrate is most preferred. The non-wovens have fine fibers with average diameters ranging from 0.01 μm to 50 μm, and are derived by dry spun processing, during which a solution of polymer(s) is injected into a stream of high velocity air with a pressure of 1 to 500 psi for solvent stripping and polymer strand attenuation. The non-wovens can be used for a variety of purposes including fabrication of medical devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.