Internal Bone Lengthener by Plate and Screws

Technology #d-1032

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Dr. Amr Abdelgawad
Dr. Noe Vargas-Hernandez
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Provisional Patent Application Filed

PCT Patent Application Filed
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Presentation- Power Point [PPT]

The disclosed invention represents a new approach to surgical leg lengthening using an internal device that does not require nailing. The invention consists of a telescoping plate that attaches to the upper and lower portions of the bone via screw; a small motor will be affixed on or within the plate. This motor, controlled remotely, will lengthen the plate, thus lengthening the bone. A ratchet system is used as the expansion mechanism.

This device represents a leap in viable treatment for leg lengthening in children. Currently, leg lengthening in children can only be accomplished by external fixation.  External fixators are not ideal for children because pins must run from the fixator, through the skin, into the bone; these pins increase the risk for infection, and are generally hard for children to tolerate. Furthermore, children with external fixators avoid contact with others because of the stigma associated with the device.  While internal lengthening nails solve the problems associated with external fixation, they cannot be used in children with open growth plates.

Market Applications:

This invention can be used in limb reconstruction and correcting limb length discrepancy.  It is less invasive than other  limb-lengthening processes in use for pediatrics. 

Features, Benefits, & Advantages:

• Suitable for children

• No external fixation

• No uncomfortable pins

• No nails

Intellectual Property:

A U.S. provisional patent application, 62,005691 was filed on 05/30/14. A PCT application was filed on 05/29/2015.

A patent issued on 4/24/2018, US patent no. 9,949,772 B2

Dr. Amr Abdelgawad, Department of Orthopedic Surgery and Rehabilitation, Texas Tech University Health Sciences Center- El Paso
Dr. Noe Vargas-Hernandez, Department of Mechanical Engineering, The University of Texas at El Paso

Development Stage: 

This technology is a part of active and ongoing research program.  A prototype device has been created and tested.