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Les problèmes communs des seringues 3-voies

26/02/2014

Trouble shooting the triplex syringe

There are probably thirty different syringes manufactured and most of them are very similar in appearance. On the plus side is the fact that most of the problems that we encounter with syringes are the same throughout all makes and models. The dilemma arises when we try to replace a button cartridge or other part because nearly all of them are different.


Most common problem with syringes is insufficient air or water flow:

1. The tip could be clogged. Remove the tip and check the flow. If sufficient, clean or replace the tip. (If the tip is no good, then throw it away!)


2. Turn off the master switch or clamp the syringe hose with hemostats. Unscrew the syringe handle. Caution: on older Adec® syringes the water and air tubes are exposed when you remove the handle. The tubes are loose. Be careful to not lose them. Just pull the tubes out and lay them aside. Now, remove the hose that is corresponding to your problem (water or air) and restore pressure. If your are working with a water problem, be sure to hold the line over a receptacle. If you have good pressure here, the problem is in the syringe head, proceed to the next step. If the pressure is weak at the hose, skip to step 4.


3. Re-attach the hose and handle to the syringe head. Now you must remove the button itself:

Turn off the master switch or clamp the hose.


Look at the side of the syringe head. Is there a pin that slips through that holds the buttons in? If so, use a small hex wrench, a slow speed bur or some other small shaft to push the pin out, while pushing lightly down on the buttons. You need only to push the pin far enough to clear the suspect button, unless you want to remove both. Now remove the button and hold the syringe over a sink or waste basket (if you are working with a water problem, if it is an air problem, don’t bother, air doesn’t make much of a mess.) Remove the clamp or turn on the master switch and check flow. It will come out where the button was. If the flow is good here, replace the button. If not, you have an obstruction in the syringe head. You might try putting the head in an ultrasonic cleaner or soaking it in CLR*. Often the syringe has to be replaced.  [*CLR is a solution available at most stores. It dissolves many water-borne deposits.  ] 


No pin in the side of the head? Look between the buttons. Is therea small screw that might be holding them in? Look carefully beneath the cap and see if there’s a place for a small wrench, the button might screw in. Nothing here? Some syringes have nothing holding the buttons in. If you see nothing holding the buttons in, pry up on the button cap. Sometimes they are a little tough to get out.


Under the button there might be a spring. Don’t lose it. If you see a valve core (like those in a car or bicycle tire) it must be removed using a valve core tool. You can get valve cores and the tool from your dealer or an auto parts store. After you have removed the valve core, restore flow. If good, replace the valve core or the button on the type with no valve core. When replacing the valve core, do not over tighten the core. 


When removing syringe buttons: Watch out for the small springs under some buttons! When re-inserting the pin, push the buttons down lightly and push the pin through. If you feel any resistance, let up a bit or go down a little more on the buttons. The pin should go in easily.


4. Weak flow of air or water from the hose going into the syringe. Trace the hose back to the source in the unit head or the assistant’s unit. With the master off, remove the hose from the barb at that point. Turn on the master switch (hold a cloth or paper towel to catch water) and see if you have good flow there. If you do, the hose is stopped up and usually needs replacing. Biofilm   can build up in syringe hoses and is very hard to expel. 


#2 Another common problem is water dripping from tip after use.

1.  Always a button or valve core problem. See above.   


Common problem #3 - water sprays for an instant when the air button is pushed..

1. Many dentists and hygienists just live with it and hit the air button once before going into the oral cavity. In the syringe head, behind the tip assembly, there is a small o-ring. If you are using the standard metal tip, the center tube of the tip sticks through this o-ring. After you have replaced the buttons and/or valve cores, replace this o-ring.


Problem #4 water will not stop squirting. 

Usually due to defective valve core or button. See step 3 at the beginning of this article.


Problem #5 water button pops out when the air button is pushed.

Caused by a stopped up tip, or the tip not being all the way in.  


#6 Air /water spray is erratic or insufficient. 

Partially clogged tip. Try another one. This problem can also be a sign of air getting into the water supply. Do you notice any air spitting into any other water source?

Les problèmes communs des seringues 3-voies

 

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