Design and development of dynamic orthopaedic implants to improve surgical treatment of the spine

González Álvarez, Alba (2018). Design and development of dynamic orthopaedic implants to improve surgical treatment of the spine. University of Birmingham. Ph.D.

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Abstract

The work in this thesis presents the development of two novel orthopaedic devices as potential improvements for the surgery of the spine.

The preliminary design of a novel device to replace the intervertebral disc of the lumbar spine was investigated. The design was driven by the synergistic application of brainstorming, TRIZ and morphological chart methods. One concept solution was chosen and its preliminary design verification was performed with finite element analysis and additive manufacturing. Furthermore, the mechanical behaviour of various polyurethanes as potential materials for the implant core were analysed with mechanical testing.

The main research of this thesis focuses on the development of an orthopaedic device to treat severe spinal deformities in children. A novel implant was designed following the application of additive manufacturing, tolerance analysis, finite element analysis and risk analysis. Five working prototypes were successfully manufactured and were tested to evaluate their mechanical behaviour under simulated spinal compressive loading. Improved fatigue strength was obtained in comparison with a current device on the market. Therefore, with further development, the novel implant has the potential for clinical use.

Type of Work:

Thesis (Doctorates > Ph.D.)

Award Type:

Doctorates > Ph.D.

Supervisor(s):