BioMedical Quadstar II Multi Modality Stimulator

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Item # Desc Pkg Price
KQST Quadstar II Multi Modality Stimulator $11.03

BioMedical Quadstar II Multi Modality Stimulator is a unique device with three waveforms, symmetric biphasic, pulsed sine, and asymmetrical biphasic with portable four-channel digital NMES, INF and TENS device. It can be used to deliver NMES, INF, or TENS therapy at a push of a button. Its programmable sequence allows the user to customize the therapy and times.

BioMedical Quadstar II Features

  • Includes
    - QuadStar II device
    - (8) 2"x 2" square reusable electrodes
    - BMLS Touch Proof multi-colored lead wires
    - (4) AA batteries
    - A/C wall adaptor
    - Zippered pouch
    - Belt clip
    - Instruction manual
  • 9 pre-programmed fixed sequences which enable the user to program 20 minutes of INF followed by 20 minutes of NMS therapy and ending with 20 minutes of TENS therapy
  • Graphic representation of the timing parameters is shown on the screen to assist the user to program the on or off ramps and on or off times
  • Patient lock system when activated prevents the patient from changing any parameters
  • When the lock is turned off, a patient compliance meter is displayed indicating the number of hour’s the device was in use.

More About BioMedical Quadstar II

  • Caution:
    - Federal law (USA) restricts this device to sale by or on the order of a physician so licensed by the State which he or she practices. Keep out of reach of children 
  • Contraindications:
    - TENS & EMS/NMS devices can adversely affect the operation of demand-type cardiac pacemakers. TENS & EMS/NMS is not recommended for patients with known heart disease without a physician’s evaluation of risk. Do not stimulate over the eyes or carotid sinus nerves as severe spasm of the laryngeal and/or pharyngeal muscles may occur when electrodes are placed over the neck or mouth. (These contractions may be strong enough to close the airway or cause difficulty in breathing.) Do not apply TENS & EMS/ NMS for un-diagnosed pain syndromes until etiology is established. Do not place electrodes in a manner that causes current to flow trans cerebrally (through the head). TENS & EMS/NMS devices should not be applied to malignant tumors. 
  • Warnings:
    - This device should be used only under the continued supervision of a physician, or outside the USA, by a qualified pain management specialist. TENS/Interferential stimulation is ineffective for pain of central origin (i.e. appendicitis, hepatitis). TENS/Interferential stimulation is of no curative value; it is a symptomatic treatment which suppresses pain sensation which would otherwise serve as a protective mechanism on the outcome of the clinical process. Safety of TENS/Interferential devices for use during pregnancy or delivery has not been established. For external use only. Electronic equipment such as EKG monitors and EKG alarms may not operate properly when TENS/Interferential Stimulation is in use. This device should not be used over metal implants or sleep apnea monitors.
    - Adequate precaution should be taken when treating patients with suspected heart problems or epilepsy. Caution should be exercised in the trans thoracic application of EMS devices so that the introduction of electrical current into the heart does not cause arrhythmia. The long-term effects of chronic electrical stimulation are unknown.
    - Persistent use of stimulation in the presence of skin irritation may be injurious. Stimulation should not be applied over swollen, infected, or inflamed areas or skin eruptions, e.g., phlebitis, thrombophlebitis, varicose veins, etc. Simultaneous connection to RF surgery equipment can cause a burn. Operation near (e.g. 1m) short wave or micro wave therapy equipment can change the output values of the stimulator.
  • Precautions:
    - Skin irritation may occur under electrodes in isolated cases following long-term application. Consult physician if skin irritation develops. The effectiveness of TENS & EMS/NMS/Interferential Stimulation directly depends upon patient selection. Use only for the specific pain problem prescribed by the physician. Do not immerse device in water or other liquids.
    - Electrode placement and stimulation settings should be based on the guidance of the prescribing practitioner. Turn the stimulator off before applying or removing electrodes.
    - Powered TENS/EMS/NMS/Interferential devices should be used only with leads and electrodes recommended for use by the manufacturer and should not be used while driving, operating machinery, or during any activity in which involuntary muscle contractions may put the user at undue risk of injury.
    - The device may be affected by electromagnetic interference. Also other electrical equipment in the close vicinity may be affected by the device. If such effects are suspected, either switch off the affected equipment and that suspected of causing the interference, or shorten connecting leads.
    - Precaution should be exercised when stimulation is used:
      1)After recent surgical procedure where muscle contraction may disrupt the healing process
      2)After an acute trauma or fracture where there is a tendency to hemorrhage
      3) Over the menstruating uterus
      4) Where the sensory nerve damage has caused the loss of normal skin sensation
  • Adverse Reactions:
    - Possible allergic reaction to tape or gel. Possible skin irritation or electrode burn under electrode. Be sure to follow the instructions of your health professional. If you do have questions or problems make sure you contact them for assistance.





 6.30" x 2.75" x 1.25" (160mm x 70mm x 32mm)

 Power Supply

 4 AA batteries, type LR6






 +/- 1%


 11.4oz  (323 grams)

INF Interferential
WaveformPulsed Sine
CH1/CH3 (Carrier) Frequency4000Hz
CH2/CH4 Frequency4001Hz to 4150Hz
Beat Frequency1Hz to150Hz
     CH1/CH2 are an Interferential Pair
     CH1: Fixed Frequency (4000 Hz)
     CH2: Adjustable 4001-4150Hz
     CH3/CH4 are an Interferential Pair
     CH3: Fixed Frequency (4000 Hz)
     CH4: Adjustable 4001-4150 Hz
Premodulated INF (Using one Channel)A mixed Interferential Beat Frequency will be produced only out of CH 1 and/or CH 3
ConstantBeat Frequency is adjustable from 1-150 Hz
Sweep 1Beat Frequency Modulates from 1-10 Hz and back over 12 seconds (6 second increase, 6 second decrease)
Sweep 2Beat Frequency Modulates from 80-150 Hz and back over 16 seconds (8 second increase, 8 second decrease)
Sweep 3Beat Frequency Modulates from 1-150 Hz and back over 20 seconds (10 second increase, 10 second decrease
Intensity0-98 mA peak to peak
Output Voltage0-33 Volts peak to peak (adj.)
NMS Neuromuscular
WaveformSymmetrical, biphasic, square Asymmetrical, biphasic, square
Pulse RateAdjustable 1-120 Hz peak to peak
Pulse WidthAdjustable 50-400 uS
On Ramp0-10 seconds
On Time0-99 seconds
Off Ramp0-10 seconds
Off Time0-99 seconds
Intensity0 - 120 mA from peak to peak (adj)Mo
Voltage0- 60 volts from peak to peak (adj.)
WaveformAsymmetrical Biphasic Square
Pulse RateAdjustable 1-120 Hz
Pulse WidthAdjustable 10-250 µS
ModesConstant: Pulse Rate (Hz) is adjustable from 1-120 Hz and Pulse Width (µS) is adjustable from 10-250 µS
B (Burst): 8 Pulses per burst, 2 bursts per second. Pulse Width (µS) is adjustable from 10-250 µS
M (Modulation): Pulse Rate (Hz) is Adjustable from 1-120 Hz and Pulse Width (µS) is adjustable from 10-250 µS and decreases 50% and back to set value over a 10 second cycle
Intensity0-100 mA peak to peak
Voltage0-50 Volts peak to peak


- 3 Years Limited Warranty.

Customer Reviews


ItemName - now     02/28/2021

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youssy     03/08/2015

why I should use off mode with channel 1&2 


Customer Care    03/12/2015

If your referring the “Off TIME” when using the neuromuscular modality in the QuadStar® II, this is simply a “resting” period between contractions. The timing options make it possible for the muscle stimulator in the QuadStar® II to do a “pseudo exercise” for the weak muscle helping to reduce atrophy and reeducate.


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