Currently in development — join the waitlist

A simple lock for
prefilled syringes.

SyringeLock helps keep your plunger in place and makes repeat dosing easier with size-specific caps and optional spacers.

Join the Waitlist See How It Works
Plunger lock Size-specific fit Travel friendly
The Problem

Prefilled syringes can be tricky

Managing a consistent routine with prefilled syringes involves a few common frustrations that add up over time.

Hard-to-read markings

Syringe graduation lines are small and can be difficult to read accurately, especially in low light or under stress.

Awkward to transport

Carrying prefilled syringes in a bag, case, or pocket without accidentally moving the plunger is a constant concern.

Accidental plunger movement

Even gentle pressure from a bag or pocket can shift the plunger, wasting medication or compromising your pre-set dose.

Inconsistent repeat doses

Manually landing on the exact same mark every time is surprisingly difficult. Repeat dosing should be simple and reliable.

How It Works

Three simple steps

SyringeLock is designed to be intuitive. There's nothing complex to learn — just a physical cap that does the work for you.

1
Draw slightly more than needed

Fill the syringe to a point just above your target dose. The SyringeLock cap will stop the plunger exactly where you need it.

2
Place the matching SyringeLock

Slide the size-specific SyringeLock cap onto the plunger. Each cap is made for a specific syringe brand and dose size — a firm, consistent fit.

3
Push until it stops

Press the plunger until the cap bottoms out. The cap locks your dose in place for storage or injection. Remove when ready.

The viewing channel lets you confirm spacer placement and relieves pressure safely.

Features

Designed with care

Every detail of SyringeLock is engineered for reliability, comfort, and confidence in your routine.

Friction-fit plunger lock
Friction-fit plunger lock

A snug friction fit holds the plunger in place during storage and travel, preventing accidental movement without complicated mechanisms.

Dose-specific sizing
Dose-specific sizing

Each cap is sized for a specific dose. Push until it bottoms out and you've hit your mark — every time, without re-reading graduation lines.

Optional 1U and 2U spacers
Optional 1U and 2U spacers

Extend or fine-tune a cap's stopping point with precision spacers. Add a 1-unit or 2-unit spacer to adjust your target dose without swapping caps.

Viewing channel
Viewing channel

A clear channel through the cap lets you visually confirm spacer placement and provides pressure relief during the injection stroke.

Raised tactile labeling
Raised tactile labeling

Dose size and series code are embossed directly into the cap so you can identify the right cap by feel — no labels to peel or print to smudge.

Color-coded by dosage
Color-coded by dosage

Each dosage size gets its own distinct color, making it fast and intuitive to grab the right cap — particularly useful when managing multiple sizes.

Product Lineup

Compatibility & SKUs

SyringeLock is designed around specific syringe brands and models. Each series code identifies the compatible syringe; the dose size is clearly marked on every cap.

Understanding the series code

Each SyringeLock has a two-part name: a series code identifying the compatible syringe brand and barrel size, followed by the dose size. For example, R30-10U fits ReliOn 30-unit syringes and stops at the 10-unit mark.

Need a different brand?
Request compatibility below.
R30 Series ReliOn 30-unit syringes
R30-5U
5 units
R30-10U
10 units
R30-15U
15 units
More sizes coming
Additional series in development

Series codes for other syringe brands and barrel sizes are planned. Join the waitlist and request your specific syringe model.

Use Cases

Who it's for

SyringeLock is designed to support anyone who uses prefilled syringes as part of a regular routine — at home or on the go.

Diabetes management

Users who prefill insulin syringes benefit from a reliable plunger stop that makes repeat doses consistent and easy to manage.

Travel & dining out

Keep prefilled syringes secure in your bag or case without worrying about the plunger shifting in transit.

Repeated measured doses

For any routine requiring the same dose each time, the physical stop removes guesswork and improves confidence.

Home organization

Store prefilled syringes in a drawer, travel kit, or sharps container with the plunger locked safely in position.

General syringe accessory use

SyringeLock works as a simple, reusable physical accessory for any lawful syringe-based routine that benefits from dose consistency.

Other lawful syringe-based routines

Whether for wellness, research, or other supervised medical routines, SyringeLock provides a simple accessory for consistent measured doses.

Get early access

SyringeLock is currently in development. Sign up below and we'll reach out when pre-orders open and compatibility expands.

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We'll be in touch when SyringeLock is ready. Thank you for your interest.

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FAQ

Common questions

Have more questions? Join the waitlist and ask directly — we read every message.

No. SyringeLock is a physical syringe accessory designed for convenience and consistency. It is not a medical device, and it does not diagnose, treat, prevent, or cure any medical condition. Always follow the dosing instructions provided by your healthcare provider, pharmacist, and syringe manufacturer.

No — and it's important to be clear about this. SyringeLock is an aid for repeat dosing consistency, not a substitute for verifying your dose. Always confirm your dose by reading the syringe markings and following your healthcare provider's guidance before using any accessory.

No. SyringeLock caps are designed for specific syringe brands and barrel sizes. Each series code (like R30 for ReliOn 30-unit syringes) identifies the exact compatible model. Using a cap with the wrong syringe will not fit correctly and may not stop at the intended dose. Check the series code before use.

Final material specifications are still being finalized during the development phase. The goal is to use medical-grade polymers that are durable, lightweight, and safe for contact with standard syringe materials. Details will be shared ahead of launch.

Yes — and we want your input. The more we know which syringe brands and models people are using, the better we can prioritize upcoming series. Join the waitlist and mention your syringe brand in the form. We read every submission.