How to Use the V2 Injectable Pen: Cartridge Guide

The V2 injectable pen is a reusable delivery device designed for laboratory research with 3 ml pen cartridges. This guide covers loading a cartridge, attaching a needle, priming, and dispensing — plus care and storage.

For laboratory research use only. This guide is educational content for researchers handling research equipment — not instructions for human use.

What You’ll Need

• V2 injectable pen — available in Slim, Metallic, and Matte models (each includes 1 free cartridge).
• V2 3 ml cartridges — replacement cartridges for continued research use.
• Pen needles — sterile, single-use. Pen needles, 100 count.
• Alcohol prep pads — for the cartridge septum before each use.

Need everything at once? The V2 Pen Kit bundle includes the pen, a cartridge, bacteriostatic water, and 100 pen needles in one package.

Step 1: Load the Cartridge

1. Unscrew the pen body to separate the cartridge holder from the dose mechanism.
2. Check the 3 ml cartridge: the septum (rubber seal) should be intact and the liquid inside clear, with no particles.
3. Slide the cartridge into the holder, septum-end first (the narrow metal-capped end goes toward the needle end of the pen).
4. Screw the pen body back together firmly — but don’t overtighten.

Step 2: Attach a Pen Needle

1. Peel the paper tab off a new sterile pen needle.
2. Screw the needle straight onto the threaded tip of the cartridge holder until snug.
3. Pull off the outer needle cap (save it — you’ll need it later) and then the inner cap to expose the needle.
4. Use a fresh needle every time. Never reuse pen needles — reuse dulls the tip and risks contamination.

Step 3: Prime the Pen

Priming removes air from the cartridge and confirms the pen is dispensing correctly. Do this whenever you load a new cartridge:

1. Hold the pen with the needle pointing up.
2. Dial a small priming amount on the dose selector.
3. Press the dose button fully. You should see a drop of liquid at the needle tip.
4. If no drop appears, repeat once. If it still doesn’t appear, check that the cartridge is seated correctly and the needle is properly attached.

Step 4: Dial and Dispense

1. Turn the dose selector to the amount your research protocol calls for. The pen clicks as you dial — count carefully.
2. Insert the needle, then press the dose button slowly and fully until the dial returns to zero.
3. Keep the button pressed for a slow count of 5–10 seconds to ensure the full volume is delivered.
4. Withdraw the needle.

After Each Use

• Remove the needle immediately. Unscrew it using the saved outer cap (scoop the cap onto the needle without touching it), then dispose of the needle in a proper sharps container. Never leave a needle on the pen between uses — it can leak or let air in.
• Wipe the cartridge septum with an alcohol pad before the next use.
• Store the pen with the cap on, at the temperature your protocol specifies (generally refrigerated for reconstituted peptides).

Care, Troubleshooting & Storage

• Cleaning: wipe the outside of the pen with a damp cloth. Never submerge the pen or get liquid inside the dose mechanism.
• Dose dial won’t turn? The cartridge may be empty — check the viewing window. Replace with a fresh 3 ml cartridge.
• Leaking? Usually a needle left attached between uses, or a cross-threaded needle. Remove, discard the needle, and reattach a fresh one straight.
• Cartridges are single-fill consumables — when one is empty, load a new one. The pen body itself is reusable indefinitely with basic care.

V2 Pen Models

All three V2 models use the same 3 ml cartridges and pen needles — the difference is the body:

• V2 Slim — lightweight, available in White, Chrome, and Light Blue.
• V2 Metallic — metal finish, available in Blue, Teal, Black, Gold, and Red.
• V2 Matte — matte finish, available in 10 colours.

Educational content for laboratory researchers. All products are sold strictly for research use and are not for human or veterinary use.