muscles. Following local anesthetic infiltration of the skin, the needle should be inserted in the normal manner for
the particular block being performed. Begin advancing the needle, and if necessary, readjust the current to within the
2 to 3 mA range. Continue advancing the needle until a motor response is obtained. Reduce the current until the
motor response is barely perceptible and then advance or withdraw the needle to maximize the response. Continue
this technique until a motor response is obtained at 1 mA or less. It should be possible to obtain a motor response at
0.5 mA.
8.0 SPECIAL CONSIDERATIONS AND CONTRAINDICATIONS
8.1 EXPLOSIVE ATMOSPHERES
This device is a possible explosion hazard if used in the presence of flammable anesthetic gases.
8.2 MICROSHOCK HAZARD
This device may be hazardous to patients with pacing catheters. If used on such patients, exercise extreme caution to
prevent the nerve stimulator output leadwires from contacting the pacing catheter or catheter leadwires. Patients
with an implanted electronic device (for example a cardiac pacemaker) or cardiac abnormalities should not be
subjected to stimulation unless a specialist’s medical opinion has first been obtained.
8.3 NEEDLE ELECTRODES
Because of the small surface area and low current values required when using percutaneous (needle) electrodes and
the potential for high current density and possible needle burns, it is recommended that only the YELLOW (LO) and
BLACK (COM) output jacks be used when locating nerves. The HI output should never be used with a needle
electrode.
8.4 USE WITH H.F. SURGICAL EQUIPMENT
Simultaneous connection of a patient to h.f. surgical equipment (i.e. electrocautery/electrosurgical units) may result
in the electronic gating mechanisms in the nerve stimulator being overridden by the cautery pulses causing stimulus
pulses to be generated by the stimulator. Simultaneous connection may also result in burns at the site of the
stimulator electrodes and possible damage to the stimulator.
8.5 USE WITH SHORTWAVE OR MICROWAVE THERAPY EQUIPMENT
Operation in close proximity to a shortwave or microwave therapy unit may produce instability in the stimulator
output.
8.6 SKIN BURNS
Use of tetanic stimulation for prolonged periods of time may result in skin burns. The stimulus current should be
gradually increased until supramaximal stimulation is achieved. Use of current levels higher than required for
supramaximal stimulation increases the risk of skin burns.
8.7 TETANIC STIMULATION
Tetanic stimulation may be uncomfortable for fully conscious patients. Therefore, it is recommended that twitch or
trainof- four be used which are better tolerated in awake patients.
9.0 SPECIFICATIONS
9.1 BUTTON FUNCTION FREQUENCY
Standby………………………………No stimulus pulses are generated
Ten Sec………………………………1 pulse every 10 seconds
One Sec………………………………1 pulse per second
Two HZ..……………………………..2 pulses per second
100 Hz Tetanus………………….100 pulses per second
50 Hz Tetanus..………………….50 pulses per second
TOF (Train-Of-Four)………………..4 pulses per 2 seconds.
Repeats every 10 seconds
Battery……………………………….Displays Battery Voltage
9.2 PULSE CHARACTERISTICS
Pulse Width…………………………...200 Microseconds
Pulse Type…………………………….Square Wave Monophasic
9.3 OUTPUT CURRENT
RED (HI) output……………………………….0 - 70 mA
YELLOW (LO) output…………………………0 - 6 mA
9.4 DISPLAY/LED/AUDIBLE INDICATORS
Digital Display: Displays amount of current in mA delivered to the patient.
Resolution of the display is 0.1 mA / 0.1 Volt. Also, displays battery voltage when the battery button is depressed.
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