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A catheter drive system used in connection with heart misalignment, a constant spring rate and electrical isolation (as even a minor current could shut down the heart) were all critical specifications in this design. The catheter rotates at 1800 RPM with only .6 in/oz maximum torque. The unit is calibrated each time to the patient. To be made of an electrical isolating material, it still had to be radially stiff, while axially flexible. Space was restricted as it must fit in the customer's design. The customer was also testing two other possible solutions to this application.
Delrin is a non-conductive material but with low tensile strength. Therefore, the flexure must compensate for the soft material but give the largest amount of torsional stability possible. Tapped threads for an attaching screw would be easy to strip out, therefore, a set screw or integral clamp were not used. So a split hub was used as the attaching mechanism. The test and evaluation involved humidity and environmental concerns, as well as normal torque and torsional testing.
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901 W.
McCoy Lane · P.O. Box 1069 · Santa Maria, CA 93456-1069 Phone: 805-928-3851 · Fax: 805-928-2369 sales@heli-cal.com · engineering@heli-cal.com |
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Copyright © 1997-2007 Helical Products Company, Inc. -- All rights reserved. |
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