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TetraGraph

TetraGraph

TetraGraph

Product catalog summary
Modes of Operation
The device operates with a TOF interval ranging from 20 seconds to 60 minutes. It features automatic stimulus setup and detection of maximal current, with supramaximal current set at 20% above the maximal current. The Train-of-Four (TOF) involves 4 pulses of 200 or 300 µs duration at 2 Hz, repeated at user-selected frequencies. The Post-tetanic Count (PTC) includes tetanic stimulation with 250 pulses at 50Hz over 5 seconds, followed by up to 20 single twitch pulses at 1 Hz. Single Twitch (ST) pulses are 200 or 300 µs at 0.1 Hz.
Stimulation Specifications
Current ranges from 0-60 mA at 5k-ohm, with a pulse width of 200 µs or 300 µs. The pulse type is a monophasic square wave, with a voltage of 300V and 2800 watt-hours.
Sensor Type
The device uses an integrated strip sensor, TetraSense, which is disposable. Sensor stimulus placement is on the ulnar or posterior tibial nerve, with recording at the Adductor Pollicis, Abductor Digiti Minimi, or First Dorsal Interosseus muscles. It is designed for single use, lasting 24 hours on the same patient.
Recording and Graphics
The recording range is 0.1–50 mV with noise less than 1 uV. It includes a 50/60 Hz filter and measures peak-to-peak MAP. The display is a color LCD with brightness control and a touch screen interface, showing MAP waveforms, TOF pulse amplitudes, TOF count, ST response amplitudes, and PTC count.
Power Supply
The device uses an EN 60601-1 power supply with a 5V DC USB connection. It operates for 8 hours continuously with a rechargeable lithium battery. The cord length is 3 meters.
Dimensions
The device measures 180 mm in length, 100 mm in width, and 35 mm in thickness, weighing 380g +/-40 g including the battery.
Additional Features
It offers three user-selectable date formats, patient ID entry, audible stimulus control, on-screen data review, and data management via TetraConnect. It connects through a USB interface and supports USB 2.0 or higher.
Environmental Conditions
During storage and movement, the temperature range is 5°C to 40°C, with relative humidity from 20% to 100% non-condensing. During use, the temperature range is 15°C to 35°C, with relative humidity from 20% to 80% non-condensing.
Standards Applied
The device complies with BS EN ISO 60601-1:2006+A12:2014, BS EN ISO 60601-1-2:2015, and BS EN ISO 60601-2-40:2016, with specific exclusions noted for certain clauses.
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Catalog excerpts

TetraGraph-1

Train-of-Four (TOF Ratio & TOF Count) Single Twitch (ST) Stimulation Current Pulse Width Pulse Type Voltage Sensor Type Integrated strip sensor Sensor stimulus placement Sensor recording placement Duration of use Recording Range Noise 50/60 Hz filter Measurement Graphics Display MAP (Muscle Action Potentials) TOF TOFC ST PTC 20 sec - 60 mins Automatic detection of maximal current Supramaximal current 20% above maximal current 4 pulses of 200 or 300 µs duration at 2 Hz repeated at user selected frequency of 20 s, 1 min, 5 min, 15, min or 60 min PTC consists of Tetanic Stimulation, a set of 250 pulses (1 pulse at 50Hz over 5s) fixed at 50mA, 200 µs; followed by up to 20 ST pulses at 1 Hz Pulse of 200 or 300 µs duration at 0.1 Hz 0-60 mA @ 5k-ohm 200 µs or 300 µs Monophasic square wave 300V, 2800 watt-hours TetraSense disposable stimulator recorder Ulnar nerve or Posterior Tibial nerve Adductor Pollicis muscle (AP), Abductor Digiti Minimi muscle (ADM), First Dorsal Interosseus muscle (FDI) Single use, 24 hours on the same patient Color LCD, Brightness control, Touch Screen interface Display of waveforms Bar of four pulse amplitudes and %, trend of successive TOFR values TOF Count, integer and trend Amplitude of response, mV, series of response amplitudes as bars Number of post-tetanic count INFO0007_v.2.0 TOF Interval Automatic stimulus s

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TetraGraph-2

Power Supply Charger Connection to mains electricity during use Cord length EN 60601-1 power supply 5V DC USB connection TetraGraph must only be used with the supplied power supply adapter and USB cable. 8 hours continuous operation with new battery in good condition Rechargeable Lithium battery, Varta Easy-Pack standard battery 3m Dimensions Length Width Thickness Weight Battery Battery specifications Additional Features Day-Date Patient ID Audible stimulus Data review Data Interface Data Management Communication Interface Patient Cable Cord length Three user-selecteable formats Yes, 12 numeric...

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