The
DUPLEX
Platform
Two Drugs. One Injection.
Zero compromises.
Duplex by Windgap enables the automatic, sequential delivery of two liquid formulations—through a single cannula, in a single injection.
Built for what can’t be blended.
From biologics that break down when co-formulated to regimens requiring precise timing between drugs, Duplex is ideal for therapies that demand separate containment—while delivering a unified patient experience.
Explore the Duplex autoinjector for
Therapies that require sequential injection of two liquids
Permeation enhancer + active drug combinations
Biologics or drugs that degrade when co-formulated
Injection regimens currently requiring multiple injections
Formulations with timing- or location-specific delivery requirements
Fewer steps.
Fewer sticks.
Fewer tradeoffs.
Duplex reimagines combination therapy delivery by simplifying the workflow for patients, providers, and pharma alike.
Duplex BY WINDGAP ELIMINATES:
Multiple injections for therapies that can’t be co-formulated
Excess packaging and device components from two-injection workarounds
Patient pain and anxiety from additional needle sticks
Co-formulation reformulation efforts that delay development or increase cost
Clinic-based delivery requirements for regimens that could be completed at-home
Smarter delivery.
Smaller footprint.
Duplex’s unified design reduces the material, waste, and patient burden typically required to administer multiple drugs separately—offering a greener, more scalable path to market.
Divide and Deliver
Using a proprietary dual-cartridge system and gas-powered actuation, Duplex easily delivers two incompatible liquids in sequence through a single cannula—without manual intervention or additional prep.
Dual 3mL
ISO cartridges
(1 - 5mL flexible)
Needle Options From 19-31 gauge
(IM & SQ)
High-viscosity capabilities
> 5,000 cPs
Single-hand activation
The Duplex Difference
From Incompatible to Integrated
Gas-powered, sequential delivery
Enables therapies that require timing or separation
Single-cannula injection
Reduces needle sticks and improves patient comfort
No co-formulation needed
Cuts reformulation time, cost, and regulatory lift
ISO cartridge support
Seamlessly integrates into existing fill/finish processes
Customizable timing and sequencing
Device-designed delay between doses for optimized pharmacokinetics
Feasibility-backed. Partner-approved.
Windgap has 105+ patents issued and is trusted by the top 25 pharma partners for delivering innovative solutions.
75 cP suspension delivered through a 29 XTW cannula
First demonstrated delivery of this drug through such a small needle.
99%
Reduction in Administration Time
In one feasibility study, the MultiMix device reduced the mixing time from 2 HOURS to a mixed and delivered dose in under 60 seconds.
Need to mix it up? Windgap delivers solutions.
Whether you’re working with sequential regimens, high-viscosity biologics, or lyophilized powders, there’s a Windgap platform built to simplify, automate, and accelerate the path to market—and a better patient experience.
Explore the full platform lineup to find the right starting point, then connect with us to customize your delivery system.
ONEMIX
The Instant Solution™ for highly soluble lyophilized drugs, designed with an easy two-step delivery.
EXPLORE ONEMIX >
duplex
Two liquid therapies. One injection. Ideal for drugs that can’t be co-formulated.
SEE DUPLEX IN ACTION >
MULTIMIX
The go-to for difficult-to-mix biologics, suspensions, and lyophilized drugs
SCHEDULE A DEMO >
duramix
A powerful, reusable platform for high-viscosity or long-acting injectables.
DISCOVER DURAMIX>
Compare Platform Capabilities
| Use Case and Challenges |
OneMix | Duplex | Multimix | Duramix |
|---|---|---|---|---|
| The Instant Solution | Two Cartridges. One Injection. | Complete Mixing. No Shaking. | Complete Control. Reusable. | |
| Drug Format | Lyophilized, highly soluble | Liquid + Liquid | Lyophilized, suspended, or shear-sensitive | Lyophilized, high-viscosity, variable cycle |
| Formulation Complexity | Low to moderate | Moderate | High | High to very high |
| Mixing Mechanism | Single-cycle reconstitution | No mixing (sequential delivery) | Multi-cycle, programmable mixing | Multi-mode, programmable, user-activated |
| Dose Volume | Up to 2x 3mL | Up to 2x 3mL (configurable) | Up to 2x 5mL | Configurable (multi-cartridge supported) |
| Viscosity Support | Low to moderate | High (>5,000 cPs) | High (>5,000 cPs) | High + customizable thresholds |
| Needle Options | 19 to 31G | 19 to 31G | 19 to 31G | 19 to 31G |
| Reusable or Disposable | Disposable | Disposable | Disposable | Reusable (electronic + docked recharge) |
| Use Case Examples | Acute-use autoinjectors, rapid reconstitution | Dual biologics, permeation enhancer + drug | mAbs, LAIs, IVF, difficult-to-mix biologics | Oncology, gene therapy, cold-chain-sensitive |
| Customization Potential | Low (plug-and-play) | Moderate (timing, sequence) | High (mix cycles, dwell time, viscosity tuning) | Very high (hardware + software configurable) |
Complex drugs don’t have to be difficult to mix.
Let’s Make Your Formulation Work—Without the Workaround.
Whether you’re developing a long-acting injectable, a shear-sensitive biologic, or a hard-to-mix lyophilized drug, Multimix was built to adapt to your molecule—not the other way around