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Neuroprostheses based on electrical stimulation are becoming a therapeutic reality, dramatically improving the life of disabled people. They are based on neural interfaces that are designed to create an intimate contact with neural cells. These devices speak the language of electron currents, while the human nervous system uses ionic currents to communicate. A deep understanding of the complex interplay...
In this work, a two-spindle CNC machine tool used for dental restorations is designed. In view of the fact that its special characteristics of the applications, the mechanical structure and main part of the machine tool have been designed and chosen with careful calculation. The characteristics of denture processing have been analyzed by using functional analysis approach, then, the mechanical structure...
Several types of middle ear implants have been invented as an alternative to conventional hearing aids for the rehabilitation of sensorineural hearing loss. To study the effect of the attachment points of their actuator on the movement of the stapes, a human middle ear finite element model was constructed. This model was build based on a complete set of computerized tomography section images of a...
The objective of this study is to develop a detailed three-dimensional geometrically and biomechanically accurate finite element model of the human lower cervical spine (C4-C6), and applied to determination of movement of the mobile type artificial disc replacement Prodisc-C made by Synthes. 3D (FE) model of the multi-level cervical spine was consists of three vertebrae and two intervertebral discs...
Channel interaction generated by simultaneous electrical stimulation of neighboring electrodes is generally undesirable. However, channels interaction, or virtual channels, can be used in a controlled manner to increase the number of perceptible electrodes for retinal prosthesis patients. Virtual channels have been used successfully in the cochlear prosthesis systems to increase the number of perceptible...
Osseointegration is critical for implant fixation, and mechanical stimuli play a role in this process. Our long term goal is to investigate the relationship between local mechanical environment and osseointegration. In this paper, as a first step in the study, we constructed an approximate 3D model of the in-vivo test and focused on calculating the strain fields around the implant. We first demonstrated...
A custom, patient-specific unicompartmental knee replacement was developed using a unsupervised neural network trained on a database of healthy knee geometries. This custom implant was then compared to a conventional implant in terms of contact stress in a Finite Element Model. The custom implant experienced lower contact stresses at the tibiofemoral joint compared to the conventional implant. The...
Detachment of greater trochanter (GT) is generally associated with hip arthroplasty complications and needs for repositioning and fixation. A new GT reattachment system (Y3) was proposed to reduce GT displacements in anterior-posterior direction to decrease non-union issues. The goal of this study is to develop and validate a FEM of the Y3 GTR system. FEM validation suggests a good concordance between...
A new method about reconstructing the finite element model of artificial knee joint is presented in this article after the research on reverse engineering (RE for short). Firstly, on the basis of the prosthesis prototype, IMAGEWARE and PRO/E are used to deal with point cloud of prototype and then prosthesis model is reconstructed; secondly, based on CT of human knee joint, distal femur (DF for short)...
A new hearing therapy called direct acoustical cochlear stimulation (DACS) was developed and validated in a first clinical trial with four patients. The key component of this therapy based on an implantable hearing device is a micro-actuator that is implanted in the mastoid right behind the external auditory canal of a patient. It generates vibrations that are directly coupled to the inner ear fluids...
Neural signals recorded in parts of the body where voluntary movement has been retained can be used to control prosthetic devices that assist patients to regain lost function. The number of signals recorded to control these devices can be increased by using a single multi-contact electrode placed over a muti-fasciculated peripheral nerve. Recordings made using these electrodes can then be separated...
Neural signals recorded in parts of the body where voluntary movement has been retained can be used to control prosthetic devices that assist patients to regain lost function. The number of signals recorded to control these devices can be increased by using a single multi-contact electrode placed over a muti-fasciculated peripheral nerve. Recordings made using these electrodes can then be separated...
Although the requirements for robotic and prosthetic skins may considerably differ, conformance is a critical property when a tactile sensory system is embedded on the skin. The skin's inability to deflect or adapt to the surface of an object will prevent the spatial features to be transmitted to the embedded tactile sensors. By characterizing viscoelastic materials like Technogelreg, silicone and...
There is a novel method for creating a 2-d parameterized finite element model of the human femur with matching artificial hip joint based on X-ray image before the hip joint replacement surgery. It can help us to evaluate the selected appropriate hip joint prosthesis
In this study a three dimensional finite element model was established to analyze the interfacial stress distribution in the osseointegrated transfemoral prosthesis. The effects of implant length and screw pitch on the stress and strain distributions were analyzed in terms of bonded and contact bone-implant interfaces. The influences of the contact parameters, contact stiffness and friction coefficient,...
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