Simulations of an Electromagnetic Microsystem Used in Biomedical Applications

Creutzburg, Tom; Gatzen, H.H.

doi:10.2529/piers090907044542

Cited by 2 publications

(4 citation statements)

References 6 publications

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“…After creating the model, the structures were meshed using the coupled field element Solid98 and the appropriate thermal material properties. From previous electromagnetic analyses [6] it was known, that a force of 6 mN could be accomplished with an excitation of 40 rnA and even a force of II mN with a coil excitation of 100 rnA. Due to the doubling of the coil area in the model, the simulations were conducted with an excitation of 80 rnA and 200 rnA, respectively, applied to one end of every coil winding after coupling the nodes.…”

Section: Thermal Simulationsmentioning

confidence: 99%

“…Several designs using FEM simulations were carried out at the imt [4,5]. The simulation results of the electromagnetic device were described previously [6]. Figure I depicts the conceptual design of the MEMS type inner ear hearing implant.…”

Section: Figure I : Conceptual Design Of the Mems Type Inner Ear Hearmentioning

confidence: 99%

“…Besides the micromechanics which were subject to the work reported on so far, a complete microactuator system also contains micromagnetics residing in the stator. The stator's physical dimensions were determined previously by conducting electromagnetic simulations [6]. Figure 11 shows a rotationally symmetric cross section of the stator.…”

Section: Mechanical Simulationsmentioning

confidence: 99%

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Mechanical and thermal simulations of a microactuator for the Stimulation of the Perilymph

Creutzburg

Gatzen

2010

2010 11th International Thermal, Mechanical &Amp; Multi-Physics Simulation, and Experiments in Microelectronics and Microsystem

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Figure I : Conceptual design of the MEMS type inner ear hearing implantThe design goal of the micro actuator is to accomplish a Sound Pressure Level (SPL) of 110 dB in a frequency range from 100 Hz to 6 kHz. The main goal of the i.e. a hearing loss due to damaged hair cells, but still a functional auditory nerve , neither approach described presents a solution. In such a case, a Cochlea Implant (CI) is required. It stimulates the nerve cells electrically [2]. This paper describes the simulations conducted to design an inner ear implant in Micro Electro-mechanical System (MEMS) technology. The system is driven electromagnetically and excites the cochlea's perilymph through the round window. Using mechanical and thermal FEM analyses the microactuator was designed. Using FEM simulations to design a microactuator is a common approach at the Institute for Microtechnology (imt) . Several designs using FEM simulations were carried out at the imt [4,5]. The simulation results of the electromagnetic device were described previously [6]. Figure I depicts the conceptual design of the MEMS type inner ear hearing implant. The system is driven electromagnetically and features a membrane with a boss at its center. The boss carries a plunger. A system excitation results in a vibration of boss and plunger. The plunger penetrates the cochlea through the round window and excites its perilymph. The system's active part contains a coil system , soft magnetic flux guides, and a flux closure located underneath the mechanical system. Due to the absence of hard magnetic materials, the system will vibrate with double the frequency of the exciting signal. Concept and System Requirements Electromagnetic device Spacer AbstractThe design of a microactuator serving as an implantable hearing aid to overcome ambylacousia was conducted by executing mechanical and thermal Finite Element Method (FEM) analyses using the ANSYS® software simulation tool. To do so, the deflection conditions to be fulfilled by the system were determined. The two challenges were to achieve a sufficiently high resonance frequency and to accommodate the physiological restrictions in the middle ear and the cochlea defining the maximal size of the micro actuator. A model of the mechanical system was created and modal analyses were carried out. In the next step, the force required to deflect the membrane in the static case and under damping of the cochlea was simulated. In a last step, a 3-D thermal model of the complete system including the micromagnetics was created to investigate the temperature rise in the system. This is important with respect to the implantation of the actuator into the human body, avoiding a necrosis of the human tissue.

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Section: Thermal Simulationsmentioning

confidence: 99%

Section: Figure I : Conceptual Design Of the Mems Type Inner Ear Hearmentioning

confidence: 99%

Section: Mechanical Simulationsmentioning

confidence: 99%

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Mechanical and thermal simulations of a microactuator for the Stimulation of the Perilymph

Creutzburg

Gatzen

2010

2010 11th International Thermal, Mechanical &Amp; Multi-Physics Simulation, and Experiments in Microelectronics and Microsystem

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“…Creutzburg et al (Leibniz Univ. Hannover, Germany) modeled an electromagnetically driven implantable hearing aid intended to overcome ambylacousia and simulated its performance (10). It was conducted by mechanical and thermal Finite Element Method (FEM) analyses.…”

Section: Biomedical Devicesmentioning

confidence: 99%

(Invited) Active Magnetic Micro and Nano Electro-Mechnical Systems (MNEMS)

Gatzen¹

2011

ECS Trans.

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For active micro and nano electromechanical systems (MEMS/NEMS), electromagnetic actuators excel in robustness, are capable of substantial displacements, and of exerting rather large forces. This paper presents an overview over interesting micro and nano magnetic actuation activities in the range of optical devices, fluidic pump systems, biomedical applications, computer and communication technology devices, as well as X and X-Y actuation systems. Particular emphasis is put on research conducted in this field at the Leibniz Universitaet Hannover in Germany.

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Simulations of an Electromagnetic Microsystem Used in Biomedical Applications

Cited by 2 publications

References 6 publications

Mechanical and thermal simulations of a microactuator for the Stimulation of the Perilymph

Mechanical and thermal simulations of a microactuator for the Stimulation of the Perilymph

(Invited) Active Magnetic Micro and Nano Electro-Mechnical Systems (MNEMS)

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