[A measuring procedure for experimental determination of tensile strength of catheters and flexible probes].
In order to obtain a more objective description of the properties usually subsumed under such terms as the "handling" of catheters, it is necessary to measure the significant parameter bending stiffness. A contact-free method of recording the oscillations of rod-shaped elements is presented. The stiffness EI can be calculated from the measured characteristic frequency. The logarithmic decrement can be derived from the damped natural oscillation and the damping properties of the catheter thus characterised. In addition, a consideration of imposed oscillations can be employed to calculate resonance frequency. A computer-driven measuring set-up employing a CCD line camera for the non-contact recording of oscillations of rodshaped elements, together with the software required is presented. The measuring principle and possible errors are discussed and a measurement described by way of an example.
Schmitz
K P
KP
Universität Rostock, Klinik für Innere Medizin.
Behrend
D
D
Martin
H
H
Urbaszek
W
W
D001696:Biomechanical Phenomena; D002408:Catheters, Indwelling; D004867:Equipment Design; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation; D008838:Microcomputers; D013718:Tensile Strength
Messverfahren zur experimentellen Bestimmung der Biegesteifigkeit von Kathetern und flexiblen Sonden.