Compression Springs for Needle Retraction Systems in Medical Devices

Smart Compression Springs: Ensuring Needle Safety in Modern Medical Devices

How custom compression springs play a critical role in needle retraction systems for autoinjectors, pen injectors, cannulas, and catheters.

31/07/2025

Are your needle shielding systems designed with patient safety, miniaturization, and regulatory compliance in mind?

As self-injection and wearable drug delivery become more widespread, the role of needle safety mechanisms is growing exponentially. One of the key components in these systems is the compression spring, which plays a crucial role in ensuring the safe and effective operation of the device.

At RPK Medical, we specialize in the design and manufacturing of custom precision compression springs that enable needle shielding in:

  • Autoinjectors
  • Pen injectors
  • Cannulas
  • Catheters
  • Safety syringes

These components aren’t just about force—they are about controlled energy storage and release, reliable actuation timing, and compliance with ISO 11608 and ISO 23908 safety standards.

Why compression springs are critical for needle shielding systems:

  • Safe Needle Shielding: Our springs ensure the needle is covered immediately after use, significantly reducing the risk of needlestick injuries.
  • Miniaturized & High-Precision: Space-constrained devices require ultra-compact, consistent-force springs with strict tolerances.
  • Regulatory Compliance: OEMs and CMOs rely on validated spring designs to meet international safety standards.
  • Sterilization & Biocompatibility: Our springs are engineered to withstand standard sterilization processes (EO, gamma, steam) and are produced in ISO 13485-certified environments.

What should you be asking?

  • Is the spring force curve consistent across production batches?
  • Can your supplier guarantee 1 million+ cycles without fatigue failure?
  • Are your needle safety systems fully compliant with ISO 23908?
  • Does your current spring design account for friction losses during shielding?

Our value for CMOs and pharmaceutical OEMs

We collaborate early in the device design process to co-develop the optimal spring geometry, material, and surface finish for each application—reducing time to market and validation risk. Whether you need stainless steel, alloy, or specialty coatings, we deliver repeatable, high-precision springs at scale.

Let’s build safer devices—together

Contact us today to explore how RPK Medical can support your next generation of drug delivery systems. We're here to help you build safer devices.

Let’s talk and turn concerns into certainties. Tell us!

Get in touch with our engineering and sales teams, we’ll listen to you carefully and find the best solution together.

Contact us now