Model NJ Stent Loading Machines

Model NJ Stent Loading Machine Base

A novel machine for loading self-expanding stents, using a tapered entrance and short dies to move the stents step-by-step
  • Unparalleled precision of opening and die gaps
  • Metal dies for extreme durability
  • No sliding of the stent on the compression mechanism
  • Can load stents of any length

The NJ Stent Loading Machine moves the stent in small steps. The stent is fed from the back of the mechanism, where a tapered section gradually reduces the stent’s diameter. When the stent reaches the straight section of the compression mechanism, it is fully compressed and ready to load. The catheter is pushed over the small length of stent extending out of the mechanism, completing the loading cycle for that step. The compression mechanism is opened, the catheter and loaded stent are moved forward, then the compression mechanism closes on the next section of stent. This cycle continues until the entire stent has been loaded.

This breakthrough technology avoids many of the problems that plague classic stent loading machines:

  • Unlike other processes, the stent does not slide across the compression mechanism dies. This allows us to use hardened stainless steel dies instead of plastic, so you can say goodbye to die replacement downtime and expense.
  • Any stent length can be loaded.
  • All ball bearing construction means the lowest friction of any stent loader in the market.
  • Unrivaled precision of the opening. Gaps between the dies are less than 10 microns.
  • Open and visually accessible layout. You can see much more of the details of the loading process – reducing the likelihood of mistakes or damaging the stent.

Optional Add-ons


Holds the catheter next to the compression opening while the stent is loaded inside. Custom bushings and molded gripper pads keep your product held securely in place.

Liquid Nitrogen Bore Cooling

Allows the stent to be cooled prior to crimping, helping stabilize the stent struts or reducing the radial force of the compression stage.

Liquid Nitrogen Catheter Cooling

Liquid nitrogen is sprayed on or in the catheter as the stent is pushed inside, reducing the radial forces and friction while loading.


The NJ requires no maintenance. The radial compression mechanism also requires no maintenance - just keep the mechanism clean. Do not use in a dusty or dirty environment. You may clean the mechanism by blowing with compressed air. You may clean the center opening with 99% isopropyl alcohol on a lint-free swab or cloth.

Required Installation Connections – Model NJ

Description Physical Specs Functional Specs
Electric Power None None None
Compressed Air Powers the Gripper, N2 Valve. (see Knowledge Base: Compressed Air & High Pressure Gas Connections) Instant Tube Fitting Accepts ¼-inch OD Plastic Tube 6.9 to 8.3 bar (100 to 120 psi)
Liquid Nitrogen Liquid Nitrogen for cooling bore or catheter Manual Dewer Fill None

Model NJ with Stent Nozzle™ Compression Station

The tapered entry of the Stent Nozzle™ allows for processing any length of stent. Ball bearings between all moving surfaces means low friction and virtually infinite life. Short length permits more access than any other stent loader.

Diameter Straight Length Tapered Length Max Radial Force Die Material
0-30 mm 6.35 mm 25.4 mm ~530 N Hardened Stainless Steel

Model NJ with J-Crimp™ Compression Station

The J-Crimp™ has been Blockwise's workhorse compression station for a decade and has proven superior durability. The compression station has extremely low friction and very-small die-to-die gaps. There is no die-to-die wear. The bore is straight, so the compression station needs to be as long as the stent.

Diameter Length Max Radial Force Die Material
0-16 mm 62,124 mm ~450 N Hardened Stainless Steel