US 6,224,892 B1Granted

Polyesterhydrogels

AssigneeSmith & Nephew, Inc.

InventorRichard John Searle

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Abstract

Novel cross-linked polyesters of pyromellitic anhydride and a polyhydroxy compound containing more than two hydroxyl groups are highly water absorbent, and biodegradable, water swellable. The polyesters may be employed for the manufacture of medical devices such as prosthetic implants, supports for cell cultures or as wound dressings e.g. as a debriding agent.

Claims9

Dependent claims

A cross-linked water-swellable polyester comprising residues derived from pyromellitic acid and a polyol containing more than two hydroxyl groups, and capable of an equilibrium water content of at least 30% w/w.

Dependencies are inferred from the claim text.

Facts

Application: 09/380,400Filed 15 Oct 1999
Priority: GB 97042881 Mar 1999
Granted: 1 May 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

C08G 63/668
Polyesters containing oxygen in the form of ether groups: derived from polycarboxylic acids and polyhydroxy compounds
A61L 15/60
Use of materials characterised by their function or physical properties: liquid-swellable gel-forming materials, e.g. super-absorbents
A61L 15/64
Use of materials characterised by their function or physical properties: specially adapted to be resorbable inside the body
A61L 27/18
Macromolecular materials: obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds

Family

No related US applications are recorded in the indexed filing history.

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