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Miniature Interface Fixation Half-pin with Roughened Center, Centrally Threaded, Trocar Point on Each End

Miniature Interface Fixation Half-Pin


These small pins are K-wire size versions of our popular Interface fixation half-pins. Commonly used with acrylic fixators and mini SK ESF clamps on toy breeds, kittens, avian patients, and small exotic pets.

These pins have trocar points on both the smooth and threaded ends. The central area of the pin shaft is factory-roughened to enhance the interface between the acrylic frame and pin. This central area is not a thread and attempts to use this implant as a full-pin are contraindicated.

Implant quality 316LVM, stainless steel

Additional Product Information

Nomenclature is based on the smooth shaft diameter. Part number 03094 has the same 2.4 mm shaft as the 2.0/2.5 mm Interface fixation half-pin but has a smaller thread profile. This pin is less frequently used with long bone fractures but finds more routine use with acrylic and pin ESF frames applied to mandibular fractures. The 2.9 mm thread diameter will not traverse the 2.5 mm mini SK clamp bolt. 

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Product Specifications

Part No. Compatible ESF Clamp Length Recommended Drill Bit Shaft/Thread Diameter (inch) Shaft/Thread Diameter Thread Length
Part No. Compatible ESF Clamp: Mini Length (mm): 75 mm2.953 in Recommended Drill Bit: 0.8mm Shaft/Thread Diameter (inch): 0.035" | 0.045" Shaft/Thread Diameter (mm): 0.9 mm | 1.1 mm0.0 in Thread Length: 12 mm0.472 in
Part No. Compatible ESF Clamp: Mini Length (mm): 75 mm2.953 in Recommended Drill Bit: 1.1 mm0.039 in Shaft/Thread Diameter (inch): 0.045" | 0.056" Shaft/Thread Diameter (mm): 1.1 mm | 1.4 mm0.039 in Thread Length: 12 mm0.472 in
Part No. Compatible ESF Clamp: Mini Length (mm): 75 mm2.953 in Recommended Drill Bit: 1.5 mm0.039 in Shaft/Thread Diameter (inch): 0.062" | 0.075" Shaft/Thread Diameter (mm): 1.6 mm | 1.9 mm0.039 in Thread Length: 12 mm0.472 in
Part No. Compatible ESF Clamp: Mini Length (mm): 75 mm2.953 in Recommended Drill Bit: 1.8 mm0.039 in Shaft/Thread Diameter (inch): 5/64" | 0.091" Shaft/Thread Diameter (mm): 2.0 mm | 2.3 mm0.079 in Thread Length: 15 mm0.591 in
Part No. Compatible ESF Clamp: Small Length (mm): 75 mm2.953 in Recommended Drill Bit: 2.0 mm0.079 in Shaft/Thread Diameter (inch): 3/32" | 0.114" Shaft/Thread Diameter (mm): 2.4 mm | 2.9 mm0.079 in Thread Length: 17 mm0.669 in


  • What ESF pins are most commonly used with Acrylx frames?

    Miniature Interface and Centerface are the most commonly used pins with acrylic frames. Use of these small diameter, threaded fixation pins prolongs the longevity of the pin/bone interface and reduces patient morbidity as compared to smooth pins and K-wire.  6 mm tubing is approximately the diameter of a pencil and should be reserved for the smallest of patients. The largest recommended pin for use with 6mm tubing is 1.1 mm (0.045”). Pins up to 2.0 mm (5/64”) in diameter are acceptable for use with 10 mm tubing.  

    • 0.9 mm (0.035") fixation pins — used with 6 mm and 10 mm tubing
    • 1.1 mm (0.045") fixation pins— use with 6 mm and 10 mm tubing
    • 1.6 mm (0.062") fixation pins — used with 10 mm tubing
    • 2.0 mm (5/64") fixation pins — used with10 mm tubing

  • Is there a sequence and technique for placement of subsequent pins?

    Typically, the third and fourth pins placed into an ESF frame are the two pins on each side and closest to the fracture. This is not mandatory; however, it is easier to verify accuracy of reduction and ensures good pin placement. These pins are placed via liberal release incisions and through pre-drilled holes. Placing the SK clamp over the area of soft tissue release, and using the secondary bolt to secure it in perfect alignment for the desired drill hole and pin position ensures correct targeting and pin placement. Next, the appropriate drill sleeve is passed through the primary pin-gripping bolt to protect the soft tissue as the bone is pre-drilled. One must be careful not to crush the thin-walled drill sleeve by tightening the primary pin-gripping bolt more than just enough to hold the sleeve in position. Pre-drilling is performed through the drill sleeve while exercising care not to exert undue pressure on the drill bit. Excess pressure results in drill bit flexing and a sudden “push through” of the drill bit into the opposite soft tissues as it breaks through the bone. The drill sleeve is then removed and low-speed insertion of the fixator pin is performed. After placing pins three and four, recheck reduction and alignment before placing additional pins. Repeat this procedure for as many additional pins as desired.