公开(公告)号：EP0822840A1

公开(公告)日：1998-02-11

申请号：EP97918007.0

申请日：1997-02-27

申请人： Hähndel, Thomas ,  Stahlmann, Hanns-Dietrich ,  Nethe, Arnim ,  Müller, Johannes ,  Buske, Norbert ,  Rehfeld, Armin

发明人： Hähndel, Thomas ,  Stahlmann, Hanns-Dietrich ,  Nethe, Arnim ,  Müller, Johannes ,  Buske, Norbert ,  Rehfeld, Armin

IPC分类号： F04B43 ,  A61M1 ,  H01F1

CPC分类号： H01F1/442 ,  A61M1/1008 ,  A61M1/1037 ,  A61M1/1053 ,  A61M1/1055 ,  A61M1/106 ,  A61M1/1087 ,  A61M1/122

摘要： The invention relates to an magnetic fluid-assisted electromagnetic drive for a blood pump used to support the heart or for partial or complete replacement of the heart. The blood pump is of a weight and energy density corresponding closely to those of the natural heart and especially suitable for implantation, the aim being to reduce the size of the total system in relation to known systems while improving its efficiency. This is achieved as follows: a blood pump is provided with a magnetic fluid-assisted electromagnetic drive comprising one or more electromagnets and force-converting devices, the intermediate chamber of at least one electromagnetic circuit is completely or partially filled with magnetic fluid and the poles have permanent magnetic properties. A magnetic fluid with a saturation magnetisation of between 150 and 450 mT and initial permeability of between 5 and 25 is used.

公开(公告)号：EP0823123A1

公开(公告)日：1998-02-11

申请号：EP97918008.0

申请日：1997-02-27

申请人： Hähndel, Thomas ,  Stahlmann, Hanns-Dietrich ,  Nethe, Arnim ,  Müller, Johannes ,  Buske, Norbert ,  Rehfeld, Armin

发明人： Hähndel, Thomas ,  Stahlmann, Hanns-Dietrich ,  Nethe, Arnim ,  Müller, Johannes ,  Buske, Norbert ,  Rehfeld, Armin

IPC分类号： A61M1 ,  H01F1 ,  H02K1 ,  H02K33

CPC分类号： H01F1/442 ,  A61M1/1053 ,  A61M1/1055 ,  A61M1/106 ,  H02K1/02 ,  H02K33/02

摘要： The aim of the invention is to create a magnetic fluid with high saturation magnetisation and a saturation concentration above 100 mT in order to transmit greater loads. This is done according to the invention by forming stable dispersions in carrier fluids of cobalt and nanometer particles modified with adsorption layers. The volume concentration of the ferromagnetic components is between 5 and 35 %, preferably 15 and 30 %, and the volume concentration of the modified particles (bare particles with adsorption coating) is up to 50 vol. %.