IMPeek Rods

IMPeek rods offer surgeons unique, flexible and dynamic solutions to complex fractures. With IMPeek rods, medullary canals can be filled up to 70% allowing plate-rod constructs up to 4x stronger than tradional plate-rod* 

PEEK (polyetheretherketone) us a bioinert polymer with similar properties to healthy bone when filled with carbon fiber.

*Beierer et al (Vet Surgery, 2014)

This rod is:

  • Cuttable
  • Autoclavable
  • Drillable
  • Radiodense and visible on radiographs
  • Strong but flexible and approximates the mechanical properties of bone
  • Biocompatible
  • Made from medical grade, carbon fibre reinforced PEEK
  • Light weight
  • Made in the USA to the highest standards

Potential uses include:

  • IM rod in conjunction with plates for long bones of small dogs and cat
  • Tie-in external fixators, especially juxta-articular fractures
  • Exotic or pocket pet orthopedics
  • Screwable dowel pins for metacarpals/tarsals
  • Spinal rods

 

(CIMP0000-PA)

 Frequently Asked Questions

 

  • Q: What is PEEK?
    • A: PEEK is an acronym for poly-ether-ether-ketone. This is a biocompatible, inert thermoplastic used in millions of implantable medical devices every year in humans and animals. PEEK is commonly used in everything from spinal fusion cages to bone anchors. PEEK is autoclavable and exceptionally well tolerated in the body - just like stainless steel or titanium implants. 

 

  • Q: How strong is IMPeek compared to stainless steel?
    • A: IMPeek is carbon fibre reinforced, which means that it is very resilient. It can't compare to steel for sheer strength, but it has a modulus of elasticity and stiffness comparable to healthy cortical bone. This is a good thing, as it mimics the biomechanical properties of bone more closely than metals. Bone healing is a delicate balance between just enough stiffness and too much flexibility. IMPeek helps to bridge that gap. Having said that, read our summary of a fantastic paper by Dr Lucas Beierer here to see how IMPeek rods and bone plates combined are actually stronger and stiffer than traditional metallic plate-rod constructs. 

 

  • Q: How do you use IMPeek rods?
    • A: IMPeek rods are best used intramedullary to aid traditional bone plates in plate-rod constructs of long bones, as they are strongest in this location, but they can be used in other modes. The main benefit of IMPeek rods is that they are cuttable, drillable and can have screws cut their own thread into them to create an interlocking construct. Your imagination is the limit. 

 

  • Q: How do you sterilize IMPeek rods?
    • A: Autoclave. This is the most simple, easy and effective. The rods are capable of withstanding temperatures in excess of 170C, so the standard autoclave temperature of 132C will not affect the rod's integrity.

 

  • Q: Why use IMPeek rods instead of regular stainless steel?
    • A: Stainless steel is cheaper and effective, but it also has its limitations. Metal rods and pins interfere with bone plate screws, which means you would potentially have to compromise screw angle, screw or pin size, choose between mono or bicortical bone purchase or leave the hole empty. With IMPeek rods you never have to compromise - just drill and screw, all the way through!

 

  • Q: What happens when you drill through the IMPeek rod?
    • A: When you drill through the rod you will feel resistance similar to drilling through very dense cortical bone. This will generate moderate amounts of heat, so ALWAYS lavage copiously when drilling. If you are having difficulties drilling through, make sure you have a new, sharp bit. We recommend new diamond coated, self centering drill bits like the ones found here. Once you are done drilling and measuring, we commonly recommend tapping the hole in the rod to ease placement of screws, even if they are self tapping. SLOWLY start screwing. If your hole passes through the entire diameter of the rod, you will feel a resistance similar to screwing through cortical bone, all the way across.

 

  • Q: Can you see IMPeek rods on radiographs?
    • A: Absolutely! We had IMPeek designed with minimally invasive osteosynthesis in mind. You can differentiate the density of the bone, metal and IMPeek easily on radiographic images. Furthermore, because the IMPeek rod is mostly carbon fibre and PEEK, there is minimal to no imaging artifact on CT and MRI. 

 

  • Q: What about the IMPeek debris?
    • A: Studies on wear debris in dogs and cats is lacking, however total joint replacements in people are often lined with PEEK, and these have looked at the effect of wear debris on local tissue. In all of these studies, negative local effect on healing and cytotoxicity were not identified. When compared to UHMWPE, PEEK is considered more biocompatible!

IMPeek rod + plate first use in Australia

by Tim Preston 

This case has generously been shared by the primary care veterinarian who helped this dog get back on her feet in rural Victoria, Australia. 

Bella is a middle aged Red Heeler who suffered a high energy trauma to the right femoral diaphysis, which caused significant comminution. The veterinarian was able to stabilize the fracture with a 6mm diameter IMPeek rod and 10 hole LCP. Three locking screws were placed proximally and distally, with the vast majority reportedly engaged the IMPeek rod. The  IMPeek rod was approximately 70% of the internal diameter of the bone according to the veterinarian. A commercial synthetic bone graft was then placed into the fracture gap. 

Within 12 hours the dog was walking on the leg with minimal sling support. Follow up will be shared as it becomes available.

For more case studies check out Tim Preston's Blog at https://www.impeek.com/blogs/news

 

Instructions For Use

 
IMPeek rods are designed for intramedullary use, but due to their unique properties, it is feasible they could be used in other functions. For simplicity, we will described how to use IMPeek rods in the most common clinical situation of plate-rod constructs. 
 
1. Autoclave the IMPeek rods as per your hospital protocols
2. Best used in conjuction with a plate, to create a plate-rod construct
3. Use a metallic pin to create a pilot hole for the IMPeek rods. Choose the LARGEST possible rod which can be inserted into the medullary canal. 
 
 5/64" 2.0mm
1/8" 3.0mm
5/32" 4.0mm
3/16" or 13/64" 5.0mm
15/64" or 1/4" 6.0mm

 

4. Use the metallic pin to measure the required length of the IMPeek rod
5. Insert the IMPeek rod with either a hand chuck or drill
6. Place plate and screws
  • Use new or sharp drill bit. The IMPeek rods are tough to drill through!
    • Our StickTite™  drillbits can help the inital purchase of the rod when first engaging.  
  • Use saline when drilling to prevent thermal damage
  • No need to avoid the IMPeek rod - drill in whatever direction you wish. If you happen to drill through the IMPeek rod, then you can screw into it and create an interlocking construct. If you miss it, then you will hopefully have a bicortical purchase
  • Tap the hole, especially for small screw sizes (1.5-2.7mm). This is because the tap has a more aggressive cutting flute than self tapping screws, which can get bound up in the rod when they cut their own thread
7. Cut the IMPeek rod using pin cutters or a sagittal saw with saline flush
8. Lavage and suction surgical site to remove IMPeek debris
 
Recommended Screw Sizes for IMPeek Rods
0.8-1.1 threaded K-wire or 1.0-1.5 mm screws 2.0mm
1.5 mm screws 3.0mm
1.5-2.0 mm screws 4.0mm
2.0-2.4 mm screws 5.0mm
2.7-3.5 mm screws 6.0mm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SKU CIMP0000-PA
Brand IMPeek