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BS EN ISO 9997-2020 Dentistry – Cartridge syringes. 6.1 Visual inspection Carry out visual inspection with normal visual acuity and without magnification. 6.2 DimensIons Measure the dimensions using a measuring device that is accurate to 1/10 of the tolerance to be measured. 6.3 Secure loading Place an appropriate size of local anaesthetic cartridge in a cartridge syringe. Move the syringe forward/backward and sideways and assess if the cartridge is securely placed. 6.4 Aspirating test for cartridge syringes of Type 2 6.4.1 Reagent A coloured liquid, for example an aqueous solution of methylene blue, with a viscosity of 4 mPa.s (0,04 poise) at (23 ± 2) °C. 6.4.2 Procedure Assemble the cartridge syringe, cartridge and needle oldimensions 0.4 mm x 35 mm. Fix the harpoon or threaded portion of the working end of the plunger rod to the plunger of the local anaesthetic cartridge in accordance with the instructions for use. Immerse the needle in the coloured liquid (see &4.1) and depress the plunger for 5 mm at a rate of 5 mm/S and then, at the Same rate, withdraw the plunger until the reagent appears in the cartridge or for a maximum distance of 5 mm. Repeat the test three times with the same local anaesthetic cartridge. 6.4.3 Observation Observe whether the requirement of &4A2 is fulfilled after each withdrawal of the plunger. 6.5 Aspirating test for cartridge syringes of Type 3 6.5.1 Reagent A coloured liquid, as described in 4d. 6.5.2 Procedure Assemble the cartridge syringe, cartridge and needle of dimensions 0,4 mm x 35 mm. Depress the plungerS mm during I s. Release the force and then immediately again depress the plunger for a further 5 mm for 1 s. Immediately after this second depression, immerse the needle in the coloured liquid (see &4.i) and depress the plunger at a rate of 5 mm/s for 5 mm and release the force. 6.5.3 Observation Observe whether the requirement of 5.4.4.3 is fulfilled. 6.6 Plunger rod 6.6.1 Plunger rod movement Hold the empty cartridge syringe vertically. Move the plunger rod fully out of the syringe, and release. Invert the syringe and repeat the test. Check if the plunger rod is capable of travelling freely and smoothly, the whole length under the force of gravity in both vertical directions. If it is capable of travelling freely and smoothly, the whole length, this test is passed. 6.6.2 Plunger rod displacement Hold the...

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