HHS® Tube
helical hollow strand

HHS® tube, or Helical Hollow Strand, is best described as a strand with an open center working channel. While HHS® tube has proven to be useful in many applications, it is most often utilized to transmit torque or pushing forces due to its exceptional whip free characteristics and a high resistance to kinks. HHS® tube can be manufactured in single, double, and triple layers in order to provide varying flexibility and control. Please contact us with your specifications – we’ll help you design a HHS® tube that fits your exact needs.

Have immediate HHS® tube needs? With our Velocity℠ HHS® rapid prototyping program, we will ship R&D orders of virtually any HHS® tube in 2 weeks or less.

Applications
  • Over the wire device
  • Manipulation components
  • Working channels
  • Endovascular devices
  • Minimally invasive tools
  • Catheter devices
  • Delivery devices
  • Urological tools
  • Neurological components
  • Bioconductors
Specifications

We design HHS® tube to meet the specific needs of our customers. We can provide parametric drawings to assist in design review and quickly return requests for quotation. For standard HHS® tube capabilities, please reference the following variables:

  • Inside Diameter*: .003” (0.0762 mm) to 0.120” (3.048 mm)
  • Outside Diameter*: .006” (0.1524 mm) to 0.160” (4.064 mm)
  • Filars*: 6-18
  • Layers*: 1-3
  • Lengths*: 1”-10' (25 mm – 3 m)
  • Pitch Direction: left, right (alternating each layer)

*If you have a request that is outside of these specifications, please contact us.

Characteristics HHS
Coil
Unifilar Multifilar
Torque Excellent Poor Good
Windup (Low) Good Poor Poor
Whip Excellent Excellent Excellent
Pushability Excellent Excellent Good
Use Tension Excellent Poor Good
Compression (%) Good Excellent Poor
Hoop Strength Good Excellent (Tight Wound) Good
Wall Thickness (thinwall) Good Excellent Excellent
Secondary Operations:
  • Customer specified performance testing
  • Droop, compression, yield (elongation at load) or torque
  • Square cut ends
  • Welding
  • Taper ground
  • Chamfering
  • OD step grinding
  • Coating
  • Assembly
  • Formed HHS®
  • Soldering
  • Velocity℠
Materials

While other alloys may be available for use in your HHS® tube, these are the most prevalent: