Precise 0.020" positional increments were translated through a full-handled trigger
Stryker Spine
MIS Deployment Instrument
Stryker Spine requested an instrument based on a pioneering spinal procedure for inserting an innovative, minimally invasive implant. A range of ergonomic surgical positions were systematically explored to ensure comfort and accuracy over the duration of an exacting surgical procedure. Tricky component attachments had to be simplified for ease of use with slippery gloved hands. Precise .020" positional increments were translated through a full-handled trigger, with an advanced, built-in reset for multiple adjustments. Surgical observation and extensive prototype testing during cadaver labs enabled HFDW to iteratively refine the device. Sterility, internal component weight, and line of sight were optimized to give the surgeon confidence during a procedure where control and accuracy are imperative.
Ergonomic Studies
Without a predetermined instrument layout, we had carte blanche with respect to ergonomics. But a lack of parameters can lead to a lack of direction, so we fabricated a series of instrument analogues in order to study a broad scope of procedural approaches.
Rapid Prototyping
Ergonomic studies determined that an upright-trigger layout provided the best control, line of sight, ease of implant-adjustment, and long term comfort. It was now time to design a form that embodied these ergonomic requirements. A series of rapid foam models explored subtle features to help surgeons quickly get proficient with the instrument - trigger contours, implant-indexing controls, location features all help the instrument become an intuitive extension of the surgeon using it.
Functional Prototype
Surgeon feedback from the foam models helped refine the design to a level where they were eager to test the instrument in a surgical setting. This required a cut steel, fully functional prototype.
Cadaver Labs
Intensive cadaver labs enabled surgeons and the design team to put the instrument through its procedural paces. The compact cyclical gear set, the implant quick-release, the indexing trigger and indicator window - all of these features came together to provide an intuitive, controlled procedural experience.
