These tests are required for SADMERC coding: Overall height, width, and depth; weight; dimensions of features in a pre-loaded state; loaded contour depth test and overload test performed 3 times with the median values reported.
Wheelchair users. At least ten wheelchair users, five of whom are clinically insensate will be measured while seated on the test cushion and a reference foam cushion. Analysis includes calculation of several variables including the Peak Pressure Index required by the PDA HCPCS
Subjects without disabilities. Measurement of non-wheelchair users is logistically and technical simpler (i.e., recruitment, transferring) but provides much different information about cushions and supporting surfaces.
Interface pressures will be measured under three loading conditions corresponding to 3 body masses, 56, 70 and 84 kg. The ability of a cushion to accommodate different body weights will be compared to a flat reference foam. Cushions will be adjusted for each loading configuration. CATEA has a variety of buttock models that reflect different types of people. Discussion would be needed to identify which model or models would be most useful. The final report will include Peak Pressure Index and Dispersion Index calculations. The pressure sensitive system will be calibrated immediately before data collection.
Instrumented buttock models have been designed to represent different human morphology. Pressures are measured at multiple locations along the model midline. Different loading conditions have been defined to represent persons ranging from 56 to 114 kg. Most often, a flat reference foam is measured in parallel to the test cushions. Pressure metrics are calculated and compared to those metrics measured on a flat reference foam cushion.
The baseline test involves: 1 buttock model at 2 loads and includes reference foam testing
A buttock model is loaded in obliquity, and the symmetry of the forces is calculated and compared to a reference cushion.
Buttock models and thigh models are used to impart loading on cushion; the height of positioning features are then measured under load
Instrumented buttock model is applied to the cushion using 3 loading conditions representing 56, 70 and 84 kg persons. Two instrumented buttock models, varying in shape, will be the indent or. Pressures are measured at 5 locations along the model midline. Pressure metrics are calculated and compared to those metrics measured on a flat reference foam cushion.
The simulated test protocol is as follows:
Report: Test results will be tabulated into a single report; raw data will also be provided in a separate report summary.Advanced Simulated Use Testing
Cushions will be exposed to a sequence of simulated use protocols reflecting 12 or 18 months of use. Three tests batteries will be run before and after each cycle (either 12 or 18 months)
Loaded Contour depth and overload depth tests will be run before and after simulation testing.
|Type of Cushion||Protocol||Sub-protocol|
|Cushions with Removable Covers||Soiling|
|Laundering cover (5 washer/dryer cycles)|
|Cleaning cushion if urine penetrates cover|
|Cushions without removable covers (or no cover)||Soiling|
Cost: 1st cushion: $1000; each additional cushion: $750