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Biomedical subjects

R Niesing

Publications and source records attributed to R Niesing.

5 recordsLinked to original sources
PubMed1992

Measurement of forces during laryngoscopy.

The forces transmitted by the laryngoscope blade onto the base of the tongue are assumed to be a major cardiovascular stimulus. This study investigates the various forces applied onto a Macintosh laryngoscope during laryngoscopy. The forces acting along the axis of the handle are described, as well as the forces exerted by the anaesthetist to prevent the laryngoscope from turning. Based on a relatively simple technique, a modified laryngoscope has been designed to measure these forces. Four different laryngoscopic parameters are determined: (1) the duration of laryngoscopy, (2) the maximally applied force, (3) the mean force and (4) the integral of the force over the time (area under the curve). The force measurements of 49 anatomically normal patients undergoing uncomplicated intubation are included in the study. The duration of laryngoscopy was 16.3s (SD 11.8), the applied peak force was 35N (SD 12) and mean force necessary was 20N (SD 6) while the force-time integral was 324N (SD 194).

Adult↗
PubMed1990

Computer-controlled wheelchair ergometer.

A new wheelchair ergometer has been designed in which a combination of realistic simulation of wheelchair propulsion--with adjustable parameters for rolling resistance, air drag, wind speed and slope--and force measurement has been realised. The static solution enables the measurement of physiological and kinesiological parameters. All data from force transducers in seat and backrest, torque transducers in the wheels and force transducers in the wheelframes as well as the acquired speed are sampled in a data-acquisition system. An offline curve processor allows the acquired data to be processed with standard or custom-programmed routines. Preliminary results have been added and are discussed.

Engineering↗
PubMed1980

Electric wheelchair simulator as a man-machine system.

The procedure for adapting an electric wheelchair for use by a particular patient has not yet been perfected. This paper describes an attempt to improve this procedure with the aid of computer-aided simulation and must be regarded as a pilot study. In this simulation a bird's-eye view of the movement of the wheelchair is represented on the screen of a display terminal. A procedure that had been worked out beforehand was tested on 16 subjects, including 4 patients who came into consideration for an electric wheelchair. Some procedural and task-oriented parameters were investigated. The discussion deals with forms of simulation and the particular influences on the learning effect, among other things. It is concluded that the simulator described may be a useful aid in the evaluation or adaptation of electric wheelchairs, though it does not give all the information needed. Further research is required.

Adolescent↗