PKMAS and Zeno Walkway System

ProtoKinetics LLCMichael RowlingKristen Larsen

www.protokinetics.com

Zeno Hardware• Technical Specifications

16 levels of dynamic pressure0.4’’ square sensors on 0.5’’ centers over sensing arrayDual control sensing elements avert false firing

•Three Layer Walkway (0.5’’ height)Base Layer:

-Flexible linoleum with sloped rubber edging facilitates smooth transitions onto walkway

Middle Layer: -Protects sensing technology and circuitry-Reduces curling of the edges

Top Cover:-Carpet or flexible linoleum with a variety of patterns-Velcro edge lining secures layers

•Customization: match your lab and research needsTop cover PatternSize

8’ 12’ 14’ 16’ 20’ 26’

2’ x x x x

4’ x x x

Zeno Walkway Setup•The 2x16 Zeno mat ships in two boxes.

•To setup, first roll out the base layer. Then, roll the sensing carpet out with its circuitry fitting into the base. Complete the walkway by securing the top cover in place with its Velcro edges.

• To record a walk, use the Zeno box to connect the walkway to the USB port of the computer with PKMAS software installed.

Powered by PKMAS Software

Syncing •Push-button switch

User marks change of event during recording for quick referencing during analysisBinary square pulse

•Zeno Interactive ModuleUse with PKMAS for lights and tonesBuilt-in random delay featuresIdeal for gait initiation

•Wireless XBEE input Inclinometer DevicesCup & Tray Dual Tasking Track upper body movement( X, Y)•Internal Metronome40 BPM-208 BPM•Sync Output (3.5mm Stereo Jack)TTL Pulse •Logitech Video Camera1-2 camerasSynchronized video and footfalls

PKMAS Angles•Projection Angle of Stride

Vector from heel of one foot to consecutive heel of the same foot (degrees)Useful in non-linear walking to describe movement direction at any point in time PKMAS step length considers direction of progression for optimal measurement accuracy

•Minimum Volume Bounding EllipseComputes ellipse with the smallest area that wholly encloses all sensors of a footfallEllipse’s major axis used to determine foot placement angleReliable over gait patterns with anomaliesEllipse theory considers the shape of entire footfallincomplete and asymmetric footfalls will display less error than competitive techniques

Center of Mass Estimated• Exclusive COMe algorithm based on velocity and direction of pressure sensor activation • Algorithm tested in varying conditions against state of the art motion capture systems at two major US research institutions

COM data (red) plotted against PKMAS COMe calculation (green).

Gait Measurements•Display Gait Measurements table in PKMAS for statistical and step by step quantitative values

•Easily navigate from any footfall measure to the first or last contact time on walkway

•Measures include:Toe/Heel LocationFoot length, width, areaStep/stride time, length, widthStance, swing, gait cycleStance, swing, single/double support percentVelocity, cadenceFoot angle, direction of progressionLeft to Right Ratios

Exporting to Excel• Export directly from Gait Measurement table to effortlessly create plots

•Graphing the Left/Right Ratio provides a meaningful depiction of asymmetrical variables

The ProtoKinetics Advantage

•PKMAS PlatformAdvanced and Accurate MeasurementsVerified, Validated and CertifiedCapable of processing many walk files that competitors cannot User-friendly, Precise DocumentationContinuous software growthExcellent Technical support

•Testing ProtocolsIncorporate new measurements Multiple passes and turning trialsZeno Interactive Module

•Zeno Walkway16 levels of pressureProtected sensing technology Available in 2’ and 4’ widthsVerified, Validated and Certified

CertificationsISO

13485:2003CE Marked