Robbins Dermo-Jet User manual

ROBBINS INSTRUMENTS

DERMO-JET

Your DERMO-JET is the latest model of the only original, authentic needleless pressure
infiltration apparatus available in the United States. Invented by Dr. A. Krantz, a French
physician, the DERMO-JET is protected by U.S. and foreign patents. The DERMO-JET is
a versatile, time-tested, medical instrument for administration of subtopical injections of
parenteral medicaments, anesthetic solutions, steroids in aqueous suspension, soluble drugs,
vaccines, antibiotics, etc. The DERMO-JET is made of the highest quality materials and is
marketed exclusively by Robbins Instruments Inc., Chatham, NJ.

Each DERMO-JET is stamped with a recorded serial number and is guaranteed against me­chanical defects for a period of one year from the day of purchase when used in accordance
with these instructions. The guarantee is not applicable to the Plastic Chamber and Plastic
Spacer. THE GUARANTEE SHALL BECOME VOID IF TAMPERING OR UNAU­THORIZED REPAIRING HAS BEEN ATTEMPTED.

WARNING: Opening of the compressed spring mechanism may result in a serious injury.

Never dry-fire. Refill before reservoir is completely empty.

BASIC DERMO-JET INSTRUCTIONS

Sterilization

Prior to sterilization, the Plastic or Pyrex Chamber should be filled with sterile water and the
DERMO-JET fired a few times to cleanse the plunger and the Injector Head. The Injector
Head and Chamber should be unscrewed from the DERMO-JET body and separated. The
Chamber should be scrubbed with a soft brush, such as a nylon perculator brush, in a deter­gent solution, followed by a thorough rinsing in clean water. The brush should not be used for cleaning the Injector Head,

as it may damage the fine wire mesh filter. Never push any cleaning object inside the Injector Head.

The DERMO-JET may be sterilized by boiling water or autoclaving (no gas) up to 284°F (140°C). The preferred steriliza-
tion method for the DERMO-JET is by steam-autoclave. Avoid dry heat. The Chamber and the Injector Head should be
wrapped separately in gauze pads, and the body of the DERMO-JET placed on a small towel to prevent direct contact with
the sterilizer. The autoclave should be set for 15 lbs. for 20 minutes. When finished, allow the DERMO-JET, Injector Head,
and Chamber to cool off before assembling it. When sterilizing the Injector Head with Spacer attached in a bath of germi­cidal solution, the droplets must be shaken off after each immersion and the DERMO-JET fired once to clear the Orifice.
Wipe any residual solution with an alcohol swab. There should be sterile water or medicament in the chamber. Never dry fire
the DERMO-JET.

www.robbinsinstruments.com •

Fax: [phone]

Loading

Unscrew the Injector Head and pull it out with Chamber attached. The DERMO-JET is normally filled with a needle
syringe from a vial with 0.5 to 4.5ml of medicament. The chamber holds 5ml but should not be filled over the
Chamber ring line, which indicates a 4.5ml filling capacity. If filling from an ampule, avoid the possibility of occluding
the Injector Head with a glass splinter when pouring directly from the ampule. To refill, unscrew the Injector Head and
Chamber just enough to make a side opening for the entrance of a needle syringe. It is advisable to discharge 3 to 4
injections into the air after refilling with a different solution, in order to evacuate the Injector Head of the residue that is
left there from the previous charge.

Priming

Please note that after the detachment of the Injector Head, and especially following sterilization, there will be a small volume
of air trapped inside the Injector Head’s channel and until this air is expelled by repeated priming, the ejected spray will not
infiltrate the tissue. It may require a few firings until all traces of air have been evacuated with the ejected solution and the
DERMO-JET is producing a characteristic sound like a “crack.”

Hold the DERMO-JET vertically with one hand and point the Injector Head down. Swing the Jack Handle down with
the other hand until a cocking click is heard. Allow the spring to return the Jack Handle to rest. (With some practice,
priming can be done with one hand.) Priming the Plunger simultaneously fills the ejection chamber with 0.1ml. Because
the ejection chamber is filled by gravity, maintaining the vertical position is highly important when the Reservoir Chamber’s
contents are low.

A faster method of priming can be produced by rotating the Jack Handle about 125° to a point where it almost locks the
Plunger into a firing position, while holding the DERMO-JET vertically. During such manipulation, the Jack Handle
remains under the spring pressure. Now, while moving the Jack Handle down and rapidly up, the Injector Head will be
emitting pulsating squirts of liquid and simultaneously purging the Injector Head of air.

Ejection and Injection

The DERMO-JET can be fired from any angle. It is actuated by pressing the thumb upon the Release Button, which
instantly triggers the ejection mechanism with an explosive impact. In using a micronized drug suspension, give the DERMO­JET a thorough shake before priming to produce a uniform dispersal of the drug. Should there be a time lag after priming,
shake the DERMO-JET again before firing.

The detachable plastic Spacer functions as a positioner and the injection-site stabilizer. The Spacer can be sterilized in a
germicidal bath (avoid harsh agents) and provides clinical asepsis for routine injections. Between patient injections, the
Injector Head and Spacer can be cleansed with an alcohol swab. To avoid lacerations, one should hold the DERMO-JET
steady and vertically. The closer the Injector Head is held to the site of infiltration, the smaller will be the puncture and the
larger the dosage of injection. Unlike a hypodermic needle, the DERMO-JET does not core, but punctures, producing a
wheal. No air can be injected. To avoid vein piercing, the wheal should be placed next to the vein.

Firing of the DERMO-JET is accompanied by an explosive burst, produced by the liquefied micro-jet ejected from the
orifice with a velocity that is higher than the speed of sound. If the patient is treated with a DERMO-JET for the first time,
the physician can demonstrate the sound effect of ejection by firing into the air. To a child patient, the painless DERMO-JET
injections can be demonstrated by harmless firing on the physician’s palm from a distance of 10 inches.

www.robbinsinstruments.com •

Fax: [phone]