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10 Items

Recent Submissions
User-centered practicability analysis of two identification strategies in electrode arrays for FES induced hand motion in early stroke rehabilitation

Salchow-Hömmen, Christina ; Jankowski, Natalie ; Valtin, Markus ; Schönijahn, Laura ; Böttcher, Sebastian ; Dähne, Frank ; Schauer, Thomas (2018-12-29)

Background Surface electrode arrays have become popular in the application of functional electrical stimulation (FES) on the forearm. Arrays consist of multiple, small elements, which can be activated separately or in groups, forming virtual electrodes (VEs). As technology progress yields rising numbers of possible elements, an effective search strategy for suitable VEs in electrode arrays is ...

A Tangible Solution for Hand Motion Tracking in Clinical Applications

Salchow-Hömmen, Christina ; Callies, Leonie ; Laidig, Daniel ; Valtin, Markus ; Schauer, Thomas ; Seel, Thomas (2019-01-08)

Objective real-time assessment of hand motion is crucial in many clinical applications including technically-assisted physical rehabilitation of the upper extremity. We propose an inertial-sensor-based hand motion tracking system and a set of dual-quaternion-based methods for estimation of finger segment orientations and fingertip positions. The proposed system addresses the specific requiremen...

Feedback-controlled functional electrical stimulation to restore upper extremity functions

Klauer, Christian (2019)

This thesis considers Neuro-prosthetic systems using Functional Electrical Stimulation (FES) to restore or support motor functions in neurologically impaired patients. An often encountered difficulty is the precise control of limb motion by adjusting the stimulation intensity. The musculoskeletal systems involving muscle mechanics, limb motion dynamics, and muscle recruitment due to FES and pos...

Advanced technology for gait rehabilitation: An overview

Mikolajczyk, Tadeusz ; Ciobanu, Ileana ; Badea, Doina Ioana ; Iliescu, Alina ; Pizzamiglio, Sara ; Schauer, Thomas ; Seel, Thomas ; Seiciu, Petre Lucian ; Turner, Duncan L. ; Berteanu, Mihai (2018)

Most gait training systems are designed for acute and subacute neurological inpatients. Many systems are used for relearning gait movements (nonfunctional training) or gait cycle training (functional gait training). Each system presents its own advantages and disadvantages in terms of functional outcomes. However, training gait cycle movements is not sufficient for the rehabilitation of ambulat...

Enhancing the smoothness of joint motion induced by functional electrical stimulation using co-activation strategies

Ruppel, Mirjana ; Klauer, Christian ; Schauer, Thomas (2017-09-07)

The motor precision of today’s neuroprosthetic devices that use artificial generation of limb motion using Functional Electrical Stimulation (FES) is generally low. We investigate the adoption of natural co-activation strategies as present in antagonistic muscle pairs aiming to improve motor precision produced by FES. In a test in which artificial knee-joint movements were generated, we could i...

Stability, voltage performance and power sharing issues of inverter-based microgrids via LMI optimization

Truong, Duc Trung (2018)

Numerous small distributed energy resources (DERs) form a new generation of power systems - the microgrid. In general, a microgrid stands for a cluster of DERs, which can collectively operate as an individual low-voltage power system during islanded mode. A microgrid can also be operated in connected mode with a large power system. DERs are often interfaced to a microgrid through power electron...

Amplifier design for EMG recording from stimulation electrodes during functional electrical stimulation leg cycling ergometry

Shalaby, Raafat ; Schauer, Thomas ; Liedecke, Wolfgang ; Raisch, Jörg (2011)

Functional electrical stimulation leg cycle ergometry (FESLCE), which is often used as exercise for people with spinal cord injury (SCI), has recently been applied in the motor rehabilitation of stroke patients. Recently completed studies show controversial results, but with a tendency to positive training effects. Current technology is identical to that used in FES-LCE for SCI, whereas the pat...

Control of a mobile rehabilitation robot using exact feedback linearisation

Schauer, Thomas (2013)

This contribution is concerned with the feedback control of a table-placed mobile rehabilitation robot using exact feedback linearisation to precisely track arbitrary position and orientation profiles. An outer control loop exactly linearises and decouples the nonlinear kinematic robot model. This loop also generates reference velocities for the three omnidirectional wheels of the robot that ar...

Continuous wrist blood pressure measurement with ultrasound

Weber, Sarah ; Scharfschwerdt, Peter ; Schauer, Thomas ; Seel, Thomas ; Kertzscher, Ulrich ; Affeld, Klaus (2013)

Blood pressure is an important parameter for the development of cardiovascular disease. By monitoring the blood pressure over 24 hours hypertension can be detected and treatment can be started. A new noninvasive long term blood pressure measurement method measures the blood pressure continuously on the wrist using ultrasound, a small balloon and a controller. The pressure is controlled with a v...

Breathing synchronized electrical stimulation of the abdominal muscles in patients with acute tetraplegia

Schauer, Thomas ; Stephan, R. ; Niedeggen, A. ; Liebscher, T. ; Dorien, J. ; Seidl, R. O. (2012)