Note: Please read this material thoroughly before using the 2500-V Madajet No-Needle Injector or accessories.

Once you begin using the injector, please keep this information available for reference. If you've already begun using the injector and are experiencing problems with it, please consult sections 3 and 4 before returning the injector for servicing. Often, difficulties with the injector or accessories can be corrected without returning your Madajet.

Section 1: Important Steps Before Use

The 2500-V No-Needle Package is shipped with four important educational items:

  • No-Needle Anesthesia for No-Scalpel Vasectomy Instruction Manual
  • No-Needle Anesthesia for No-Scalpel Vasectomy Instruction DVD
  • MadaJet XL Medical Presentation
  • MadaJet XL Product Manual

These materials are provided to help you to get the best use of your MadaJet and perform anesthesia appropriately. They include information on how to clean and maintain the injector as well as certain cautionary warnings to help you avoid unsafe practices. Use these materials to familiarize yourself with the various parts of the injector. (See the diagram on page 6A of the Instructional Manual).

Also, be sure to familiarize yourself with all of the functions of the injector and accessories. It would be wise to practice doing the following:

  • Priming the Injector head
  • Cocking the re-cocking lever
  • Filling the anesthesia solution chamber
  • Changing the Sheaths (part #408SS or 2525)
  • Wearing the finger protector while injecting

Be comfortable with using the injector and walk yourself through an actual procedure. Your comfortable and confident use of the injector will do much to put your patients at ease.

If any of the materials mentioned earlier were missing from your 2500-V No-Needle Package or you'd like to have an extra copy, please contact us toll free at 1-800-635-2452. Electronic files are available.

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Section 2: Primary Functions Done Properly

Before firing the jet injector, it is important that the instrument be "primed". Using sterile technique, a drop of lidocaine solution is placed over the seal on the injector head to promote a good seal with the filling chamber. After filling the chamber with anesthesia solution, prime the instrument by pumping the injector head back and forth onto the main body.

  • A small amount of solution will be expressed from the nozzle. This indicates that there are no air bubbles in the injection stream. If you do not see solution spray from the nozzle when you prime the instrument, check that the cocking lever is not already cocked.
  • When the cocking lever is pulled, it compresses the main spring and raises the release button to firing position. The instrument will not fire unless the cocking function has been done properly. First, hold the Madajet nose down in vertical position. Hold the body of the injector in one hand and pull the lever down to a 90 degree angle. The instrument is not cocked until you hear it click. The instrument must be re-cocked before each firing.
  • To inject anesthesia, hold the instrument with the sterile sheath firmly over the patients' vas deferens and press the release button. Do not hold the instrument away from the patient when firing.
  • Sterile sheaths (grooved spacer) fit firmly onto the tip by pushing over extenda tips. It is usually better to affix the sterile sheaths after you've primed and cocked the instrument. The functions discussed in section 2 are explained in great detail (with corresponding images) in your product manual.
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Section 3: Avoiding Damage or Injury

Page 6 of the Madajet instructional booklet gives the following notice:

"Although proper care of the MadaJet is easy and takes only seconds to perform, most of the problems that physicians encounter are mainly due to not following the directions."

The following practices may damage the injector or cause it to malfunction:

  • Cocking the injector horizontally or pointing upward.
  • Leaving anesthetics in the injector overnight.
  • Firing the injector while the fill chamber is empty.
  • Firing when the head assembly is not completely attached.
  • Use of dry heat autoclave or chemical sterilizers.
  • Extenda-Tip not tightened sufficiently

The design of the injector calls for the user to hold it vertically (nose down) when cocking the MadaJet. Anesthetic agents may stain and turn brown, or clog the nozzle if left in the injector overnight. If the injector is empty or the head is not properly attached when fired, this may cause the head to eject from the body of the instrument. Dry heat autoclaves cause the washers inside the injector to dry out and crack. The washer can likewise be damaged if the injector is frequently chemically sterilized.

These practices may injure the operator and / or patient:

  • Injecting digits to test the injector.
  • Firing the injector without priming.
  • Performing local anesthesia on the scrotum without use of finger cot.

The injectors are calibrated to handle injections of certain depth. Thus it is generally unwise to test inject one's fingers or sites other than the sites approved for your particular injectors setting. If the injector is not primed this may allow air bubbles to become trapped in the jet stream and cause injury to the patient when fired. The same may also be the case when firing the injector horizontally. Performing anesthesia without wearing the finger protector completely pulled over the appropriate digit could possibly lead to a user injury.

It is important that operators wear a finger protector over the middle finger of the non-dominant hand behind the vas to prevent accidental injection of anesthesia through the scrotum into the practitioner's finger.

Much time and expense can be saved by performing the safety, cleaning and maintenance procedures properly. It is recommended that the injector be returned to the manufacturer for maintenance annually.

To request a repair or a routine service of your MadaJet, click here and follow the directions.

Keep your injector in good working order by following these procedures daily:

At The Beginning of the Day
  1. Put 1-3cc of anesthetic solution or medicament to be used into the fill chamber.
  2. Prime 2-3 times. Screw head onto body, cock and fire.
  3. Place jet injector into holder.
At The End of the Day
  1. Unscrew head assembly and pour or spray approximately 3cc of Ready-To-Use MadaCide-FD into glass fill chamber.
  2. Flush out MadaCide-FD by putting 2-3cc of distilled water into fill chamber. =
  3. Prime the injector, and then empty the flush water.

To steam autoclave or gas sterilize the entire injector, follow normal sterilization procedures. Be sure that all anesthetic solution has been flushed out before proceeding.


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Section 4: Troubleshooting

  1. My injector does not cock.

    Please check that the cocking function is being done properly. In the product manual the diagram shows the position of the injector body and lever for cocking. Hold the instrument nose down and pull the lever 90 degrees horizontally. If your jet will not cock after consulting the manual, please follow the steps on the service request form to have the problem corrected.

  2. There is not sufficient pressure to do a proper injection.

    On page 6B of the Medical Instructional booklet the following procedure is recommended:

    • Cock and fire the injector two or three times to ensure a proper fine jet stream.
    • If you have an ultrasonic cleaner, place only the head assembly with the Extenda Tip in the unit. Use MadaCide FD solution in the ultrasonic cleaner for 10 minutes to provide disinfecting and cleaning action.
  3. There is discoloration and staining in the injector or solution.

    As mentioned in Section 3, this is usually due to frequently leaving anesthesia solutions (or medicaments) in the fill chamber overnight. Therefore, flush the head of your Madajet completely as described earlier. After the unit has been sterilized, check each part for damage or staining. If any remains, usually repeating the process will easily correct this problem.

  4. The seals are wearing out.

    Injector seals and washers are manufactured to stand up to rigorous use. If within a few months of owning a Madajet, it seems that these parts are cracking or wearing away, please check the sterilization practices of your facility. It may be that an appropriate method is not used. Steam autoclaves are generally recommended. Dry heat autoclaves are not recommended. However, please remember that if you've had the unit for over 1year it needs to return to the manufacturer for yearly maintenance.

  5. The injector makes a "popping" sound when fired.

    This can occur when the injector has been used frequently and not returned for annual servicing. However, it most often occurs when there is not sufficient anesthesia solution in the fill chamber. Check your fill chamber and fill it comfortably. Prime it (as noted in Section 2). Also, make sure that all of the seals are in place.

  6. The tip of the injector is leaking.

    This will only occur when a part of the head assembly is missing, damaged or not completely attached. Check the diagram in your copy of the Madajet product manual. As you examine the parts of the head assembly note any missing part as well as their names (noted on the diagram). These can be replaced easily by contacting us at the phone number above.

A copy of the Madajet internal mechanism diagram is available upon request.

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