A bone lag screw that can provide continuous dynamic compression across the fracture while accommodating resorption as the bone heals.

Summary
Bone fractures are frequently repaired by securing screws across the
fractured part of the bone. Ideally, the screws secure the bone
fragments together tightly while the bone heals. Frequently, the
edges of the fracture will resorb during revascularization, resulting
in reduction or elimination of the initial compression provided by
the screw. A University of Nebraska Medical Center researcher has
created a bone lag screw that could provide continuous dynamic
compression across the fracture while accommodating resorption as
the bone heals thus providing improved long-term stabilization
until revascularization is completed. The dynamic compression
device incorporates a uniquely designed helical spring that
protects the screw during insertion and removal processes. The
unique design will also prevent torsional deformation of the spring
during demployment, which allows for sustained compression
during healing. The device incorporates additional novel features
that prevent side load distortion and allow for stable angular
insertion across the fracture. These aspects and design features of
this device can also be applied to additional orthopedic surgical
procedures, including hip/joint replacement. This technology also
includes a unique drive tool with two spaced-apart drivers. One of
the drivers engages the distal drive surface while the other driver
engages the proximal drive surface. The two drivers apply torque
simultaneously to the screw on opposite ends of the spring section to
assure that the spring section does not undergo torsion during
deployment.

Market Value
This technology provides a superior bone repair fastener, providing
continuous compressive forces to a bone fracture during the healing
process, thereby improving revascularization and long-term
stability.

Features and Benefits
• Long term stabilization
• Faster healing
• No torsional deformation of spring -section of bone lag screw

Patent Issued 7,175,626

(TID 36)

UNeMed Corporation offers a variety of licensing options and collaborative development opportunities with the University of Nebraska Medical Center.