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Biomecánica

Elastic Intra-medullary Nail – CIE

Intra-medullary nail for the femur and tibia which has an implantation technique which is simpler and less invasive.

Description

The Elastic Intramedullary nail (CIE) has been designed by the Department of Mechanical Engineering of the Instituto Tecnológico de Canarias in collaboration with Dr. Javier Ara Pinilla and Dr. Guillermo de la Barreda (Service of Orthopaedic and Trauma Surgery of the University Hospital of the Canary Islands).
The elastic behaviour of the nail offers great advantages in the treatment of diaphyseal fractures of the long bones (femur, tibia and humerus). These kinds of fractures are very frequent and surgically treated with locked nails whose implantation involves a high X-ray exposure for both surgeon and patient because the focus of distal fixation screws should be guided by images.

The CIE is an intramedullary nail for the femur and tibia which has the same indications as a locked intramedullary nail without presenting in its implantation technique the problems relating to distal blocking (without need of screws), which in this case is done in an automatically manner, reducing the period of exposure to X-rays both for the surgeon and the patient (less invasive technique), as well as simplifying and abbreviating the surgical needed steps (simpler surgical technique). The elasticity of the device gives an optimal adaptation to the medullary canal with a single implant for each length (reduces to a third the set of implants) and promotes a correct mechanical stimulation of the fracture focus.

Furthermore, implantation does not require milling of the medullary cavity, which means that there is, theoretically, a reduction in the incidence of infections and the risk of embolism, and as a characteristic to be especially mentioned of the nail, to underline the compression radial of the diaphyseal, which facilitates the axial reduction and stabilises the diaphysis in connection with rotation. As a consequence of these premises, the implantation of the nail and the post-operative process is much quicker.

Potential Benefits and Uses

The nail is made of a titanium alloy, Ti-6Al-4V ELI and as competitive advantages it presents implantation without intramedullary milling, which involves less risk of incidents and infections; it combines stability and elasticity guaranteeing a correct fixation of the fracture, distal blocking is automatic and guided, with the result that the exposure to X-rays is reduced; the self-compression of the focus of the fracture; and, finally, the elastic adaptation to the diameter of the medullary canal, which means reducing the stock of pins.

Transfer / Commercialization

La propiedad industrial del CIE está protegida a través de la patente PCT (ES03/00597).

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