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Biomecánica

System thoracic-lumbar fixing of the spinal instabilities - SPINFIX

System with the lowest profile of all the systems that are on the market and compatible with external fixators of spine.

Description

The SPINFIX, system thoracic-lumbar fixing of the spinal instabilities, was designed by the Instituto Tecnológico de Canarias in collaboration with Dr. Javier Vicente Thomas (Spinal Unit of the Orthopaedic and Traumatology Service of the Miguel Servet University Hospital, Zaragoza).
The greatest difficulty which carries currently the assembly of conventional systems is the intra-operatory folding of the titanium rod (6 or 7 millimetres in diameter), in a cold sterile field, which permits the correct positioning of the vertebrae as well as the rapid locking of each assembly.
In order to solve this problem and reduce implantation time, the SPINFIX system has been designed with biarticulated connectors which join the rods to the pedicular screws without need of a precision folding. In this manner, a standard bent of the rod ensures the system closure in a wide range of variations of the screws orientation. The locking of each connector is carried out with a single clamping screw, locking the assembly. This is a simpler and quicker system with greater reproducibility of closure. Furthermore, the connector respects and maintains invariant the mechanical features of the rods, with the result of an assembly with a very low profile.
The fixing system is an innovative product in a segment of the market that is well covered by the multinational companies in the sector but which is in continuous evolution.
The rod-screw locking system of the SPINFIX is simpler and faster than conventional ones and allows assemblies of several vertebral levels without bend the rods in an artisanal and intraoperative way (minimum bending), which facilitates and simplifies its implantation. Furthermore, the motion range of the connectors is greater than in the polyaxial screws which are currently on the market. The resultant profile of the assembly is extremely low, leaving the implant unnoted once the surgical field is closed. Its compatibility with the external fixators of spinal gives great versatility.
The design process of SPINFIX has required mechanical simulations (Finite Elements Method), as well as the manufacturing of some prototypes of developed versions which have been tested both functionally and mechanically.
The fixing system is an innovative product in a market segment well covered by multinational companies in the sector but continually evolving.

Potential Benefits and Uses

The main feature of SPINFIX, manufactured in alloy Ti-6Al-4V ELI, resides in that it has the lowest profile of all systems that are being marketed, and is unnoticed after assembly once the surgical field is closed. The motion range of the connectors is greater compared to the polyaxial screws, which cover a wide range of positions and limits the need for bending the rods intraoperative; in addition, the locking of the fixator is optimal because it is performed through a single screw. As a result, the implantation is faster and easier. It has great versatility because it is compatible with external fixators of the spine.

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