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Functional Electrical Stimulation
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O2CHS - Stimulator (Odstock Two Channel Stimulator)

The Odstock Two Channel Stimulator is essentially 2 ODFS in a single box but with additional circuitry to allow the two stimulators to interact.
It can be controlled by one or two foot switches with all the same control features of the ODFS with the addition of an adjustable delay following initiation on the second channel and variable stimulation frequency.

The device has been used for bilateral dropped foot, dropped foot with push off by adding calf stimulation, dropped foot with knee flexion by addition of hamstrings, dropped foot with hip extension by adding gluteals, dropped foot and knee extension adding quadriceps, bilateral quadriceps, dropped foot with triceps for reducing associated reaction and assisted cough for high level tetraplegia.

O2CHS Stimulator

O2CHS Stimulator
Specifications:
  • Output amplitude: 0 to 100mA into a 1kOhm load;
  • Frequency: 20 to 60 Hz;
  • Pulse width: 300 micro seconds;
  • Output times: 0 to 6 seconds;
  • Delay: 0 to 2 seconds;
  • Ramping times: 0 to 4 seconds;
  • Extension times: 0 to 2 seconds;
  • Battery: PP3, 9V.
*All specifications ± 10%.

Example:
Improved gait in a MS patient while used for bilateral dropped foot

Steps sequence while stimulation is OFF
Steps sequence in a SM patient while stimulation is OFF
 
Steps sequence while stimulation is ON
Steps sequence in a SM patient while stimulation is ON

For this SM patient, the speed test revealed 50% increase in walking speed and a 52% decrease in walking effort (PCI measurements - Physiological Cost Index) while using the O2CHS.

O2CHS - FES Clinic, Salisbury, UK web page.
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