Pressurized "Jet" Injectors Fact Sheet -------------------------------------- I have personally tested all models available as of June, 1996. I am not affiliated with any manufacturer. I welcome your comments, corrections & questions. Jet injectors require cleaning every 2-3 weeks, a willingness to learn how to use them, and some body fat to inject into. Both adults and children use them, although some people cannot, citing painful injections and bruising or bleeding at the injection site. On the other hand, many users, myself included, have no pain, no bruising, and only an occasional pinpoint spot of blood at the injection site -- and I inject 3-5 times per day. Clearly, YMMV (Your Mileage May Vary). Sincerely, Jonathan Mills Associate Professor Computer Science Department Indiana University Bloomington Indiana 47405 email@example.com Manufacturers in alphabetical order ----------------------------------- The first telephone number given is the business number. Some overseas locations can't reach 800 numbers (but if you can, use the 800 number and save the charge). --------------------- Medi-Ject Corporation 1840 Berkshire Lane Minneapolis Minnesota 55441 USA 612-553-1102 1-800-328-3074 Models: Medi-Jector EZ US$ 595 (50 units maximum, new design 1996) (Children's model available with smaller nozzle) --------------------- Moore Industries, Inc. Medical Technologies Division 185 E. North Street Bradley Illinois 60915 USA 815-932-5500 1-800-662-2471 (You may be referred to a distributor.) Models: AdvantaJet US$749 (50 units, RN/LPN trains you in person) GentleJet US$749 (Children's model) These models have been called a variety of names. Basically, these are all the same unit: PreciJet, Freedom Jet, Freedom System, AdvantaJet, GentleJet. However, a new model is reportedly under development. ------------------- Vitajet Corporation 27075 Cabot Road Suite 102 Laguna Hills California 92653 USA 714-582-0713 1-800-848-2538 (You may be referred to a distributor.) Models: Vitajet II US$1000 (50 units, price approximate) Injectors in the order I tested them & wrote this sheet ------------------------------------------------------- Medijector EZ VitaJet AdvantaJet (Freedom Jet) ------------- ------- ------------------------ cost $595 about $1000 $749 training video video nurse comes to your home user's manual user's manual user's manual dosage 2-50 units 2-50 units 2-50 units settings 15 12 12 adjusted? backoff twist change internal backoff twist pressure rings easy to wind? moderate moderate moderate (new grip is (grip has (grip has larger) 'wings') 'wings') reliability excellent good excellent (plastic 'crystal check' chamber ring should be replaced every 3 months) trial period 30 days 30 days 30 days clean? every 2 weeks every 2 weeks every two weeks how? wash then soak in alcohol soak in alcohol boil 20 min for 20 min for 20 min to sterilize injection 'snap' to 'snap' to 'snap' to slight pain slight pain slight pain (Sensation depends on dosage & site & subcutaneous fat: the more fat, the larger the dose that can be injected painlessly I have tested all with up to 30ml of saline in my outer thigh and have had no pain, only a slight discomfort (stinging). In daily use the mediject & the vitajet produce no pain, but the mediject is easier to adjust for different pressure settings for different sites (arm, thigh, stomach, buttocks). I found that starting with the injector (having never used insulin before) I would get large raised lumps, due I now believe to a local allergic reaction to the preservatives in the insulin. After a couple weeks they went away, but until they did I was liable to get a yellow-green bruise a day after the raised lump, and at that site.) frequency 1-5 times per day for most users of injection easy to read small numbers big numbers big numbers (easy) (very easy) (very easy) recommend no yes yes for arthritic or sight- impaired users? recommend no no no for extremely thin users? combine dosages yes yes yes restrictions ultralente ultralente ultralente may clog may clog may clog nozzle, clean nozzle, clean nozzle, clean more often more often more often (do not use ultralente with the tender touch) load r before load r before load r before nph/ultra nph/ultra nph/ultra available no yes no without prescription (don't ask me why the vitajet isn't, I don't know) cost covered 50-90% 50-90% 50-90% under insurance as 'durable medical equipment' (Note that many MDs and CDEs base their opinion of injectors on their performance 10 years ago -- and they have improved dramatically since then. You may have to be VERY pushy to get your MD or CDE to agree to let you use a pressurized injector). other equipment vial adapters vial adapters vial adapters 6/$18, not ? ? reusable - crystal check - chamber rings (All come with a pocket wallet to carry the injector and a couple vials of insulin, and vial adapters and caps. All also come with sterile saline to practice your technique. The vitajet comes with spare o-rings, crystal check chambers, and pressure-setting rings. The medijector includes small plastic tools to remove the injector head for cleaning. the advanta- jet has a very nice small case for daily use, a larger case for travel use, and a cleaning/soaking stand) General comments ---------------- 1. Bruising. The advice from all manufacturers if you have shallow bruising is to INCREASE THE PRESSURE SETTING (fewer back-off clicks). In my experience, having started with the injector at the same time as I took insulin, and being careful to follow the instructions AND to practice with saline first for a few days, and based on a statistically insignificant number of other users: it will take a few weeks to adapt to the insulin. Even humulin is not 100% pure human insulin. Once your body is used to the preservatives and carriers -- which are far more evenly distributed with a pressurized injection, and so more likely to cause a local allergic reaction in the skin -- the bruising will stop. Stick with it. (After two years: no more welts after those first few weeks. My suspicion is that it was a brief allergy to the preservatives, and that it had nothing to to with small variations in injection technique -- the injector seems to be forgiving of such tiny error) 2. Deep bruising. If you have deep bruising then DECREASE THE PRESSURE SETTING (more back-off clicks). Deep bruising is usually accompanied by a large drop of blood or bleeding at the injection site for several seconds. The injection may have been painful. A small dark purple bruise, perhaps 1 inch (2.5cm) in diameter, forms later at the injection site. Decrease the pressure setting. If you've been pretty consistent in your technique, you probably forgot to adjust the back-off clicks entirely. I've done it myself. 3. 'Wet' injections. If the injection site is wet, and has a 'puddle' of insulin afterwards, the pressure setting was probably too light. Increase it. But, if you have been using your injector for several months, and are not rotating sites (a benefit of the injector) and didn't make a mistake on your settings or change your dosage amount...then check the inside of your vial adapter. Changes in atmospheric pressure or temperature can cause the insulin in the adapter to bubble out as you load the injector, and leave the injector head holding enough insulin to wet your skin. Since an injector has enough strength to shoot a stream of insulin through your clothing and into your leg if you activate it accidentally (experience speaks here), the odds are that the injector head was wet. But check your dosage, pressure settings, vial adaptor, etc. at your next injection to be sure nothing has changed. 4. Cleaning and Sterilization. Isopropyl alcohol may or may not sterilize an injector. The manufacturers argue about this, and I could not get a definitive answer from the physicians I asked. For best results, do NOT share your injector, and DO follow the manufacturer's guidelines. Having said that, I will also say that I now clean and sterilize the medijector only 3-4 times per year, and it works fine. In part, this may be because I use mostly R insulin, which does not clog the orifice. YMMV. Keep track of your injections if you choose to do this: a series of shallow or deep injections may be due to a clogged injector or crystallized insulin inside the injection chamber (and no, this is unlikely to be a problem during the first month or two of use).
Reprinted with permission of Jonathan Mills
Last Updated: Thursday August 29, 2002 20:59:44
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