Catalog excerpts
WillowWood Fusion™ Foot Test for Vertical Deflection was performed as follows: The lower contact surface of the fixture is a horizontal plate with ball bearing under it so that it allows translation in the A/P direction of the foot. The foot is set on the horizontal plate with the appropriate heel block under the heel of the foot. A preload of 50 N is applied to the foot without the Receiver alignment screws of the fixture contacting the pyramid mounted to the foot. The 4 alignment screws are then adjusted inwards until all 4 screws contact the pyramid. The screws are then tightened to 12 ft lbs. The foot is loaded in the vertical direction from 50 N to 1230 N at a rate of 200 N/S. The foot is then unloaded back to 50N at a rate of 200 N/S. The maximum displacement is then recorded. The setup for the test is shown in Fig. 1. The test was performed on a 27cm Fusion Foot with the appropriate specifications for an activity level 3 patient that weighs 180 lbs. In the case of the Fusion Foot, this correlates to a Category 3 foot. The vertical deflection curve for this foot is shown in Graph 1. The maximum displacement recorded was 11.7mm. Figure 1. Test Setup for Vertical Deflection
Open the catalog to page 1WillowWood Fusion™ Foot Fusion 1400 Displacement (mm) Fusion Graph 1. Vertical Deflection curve for 27cm Cat 3 Fusion Foot
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