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1. (WO2014199167) ELECTROACTIVE ACTUATORS

Pub. No.:    WO/2014/199167    International Application No.:    PCT/GB2014/051813
Publication Date: Fri Dec 19 00:59:59 CET 2014 International Filing Date: Fri Jun 13 01:59:59 CEST 2014
IPC: A61M 1/10
A61F 2/00
Applicants: THE NOTTINGHAM TRENT UNIVERSITY
NOTTINGHAM UNIVERSITY HOSPITALS NHS TRUST
Inventors: BREEDON, Philip
COULTER, Fergal
RICHENS, David
Title: ELECTROACTIVE ACTUATORS
Abstract:
The invention relates to actuators based on electroactive polymeric materials for use in pumping fluids or in other applications where a contractile actuation is required, in particular although not necessarily exclusively for use in vascular pulsation devices such as a variable aortic tension device. Embodiments disclosed include an actuator ( 10) comprising: an inner tubular structure (15, 12); an outer tubular structure (13, 14) surrounding the inner tubular structure ( 5, 12) and comprising a plurality of layers of a dielectric elastomeric material ( 13) and a tubular elastic support structure ( 14), the elastic support structure (14) configured to maintain a pre-stress in the layers of the dielectric elastomeric material (13), wherein the outer tubular structure (13, 14) is configured to contract in a radial direction around the inner tubular structure (12, 15) upon application of an actuation voltage signal across the dielectric elastomeric material layers (13).