Inline Foot Contact Sensor

2-FSR Sensor Foot Contact Lead
for Noraxon cable and telemetry systems

• 2 small foot switch sensors per foot/side/lead
• Marks Heel strike and Toe off events during gait
• Adjustable sensitivity
• Creates a reliable foot contact signal
• Easy to replace sensors

The Inline foot contact sensor lead consists of 2 FSR (force sensitive resistor) switch sensors. They can be mounted on the heel and the toe or metatarsal region. It is designed for quick and easy use in clinical gait analysis. Each lead has a built-in sensitivity switch which allows for the adjustment of the switch threshold for in-shoe measurements. The switch sensor has plug-in functionality for Noraxon cable (1400 series), telemetry (TeleMyo 2400 series) and the NEW MyoTrace 400 systems. The FSR sensor consists of a thin circular film pad that is easy to attach.

Bilateral Ground Contact

During walking, each side creates a ground contact on/off signal. Within this scheme, any ground contact in-creases the signal to high level and swing phase drops the signal back to zero. This established switch scheme can be used to trigger unilateral and bilateral gait phases.

The sensor has a predefined measurement configuration in all the Noraxon software packages and is operational in a few seconds:

MyoResearch XP sensor selection screen

Operation Examples

The sensor can be used to detect the joint motion of most major joint regions:
Hand, arm, shoulder, head, trunk, thigh, shin, and foot.

4 possible attachment sites on the bottom of the foot

The most established setup is: heel, metatarsal 1 and 5, toe. Double-sided tape on the back of the sensor assists in positioning it correctly. Additional taping may be required to guarantee a stable position.

Foot Switch System connected to
the TeleMyo system

The 2 foot switch leads (one for each side)
can be connected to any analog input channel
of the amplifier. Noraxon’s latest telemetry
system, TeleMyo 2400T G2, supports two
additional digital input channels, which can
operate the foot signals. The benefit is that
no EMG channels are used.

B&L Foot Switch Sole

Noraxon’s Inline Foot Contact leads are compatible with the well-established foot switch soles manufactured by B&L Engineering CA – U.S.A. This sole has a separation of fore and back foot region. The benefit is the speed of setup and ease of use - a perfect tool for clinicians. The sole can be ordered from Noraxon as an accessory or in place of the single FSR-sensor leads.

Specifications

Features:

• FSR Sensor response time ~2 ms
• Output Signal Range 0 to +5 volts
• Sensitivity Adjustment (uncalibrated) .015 to 1.2 kg/cm2
• 2 output levels (foot on/off)
• No Pressure - 0 volts
• Any Sensor activated – 5 volts
• Sensor Diameter .75 in (18.5 mm)
• Detachable sensor lead length: 12 in (31 cm)
• Inline Cable Length: 42 in (~ 1m)

View Specs (PDF)

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