Development of a computer-guided orthopedic laser surgical system - vision & measurement

Spatial Surgical is developing a novelfirst in class orthopedic laser system that rapidly and safely ablates soft tissue and bone through a single handpieceSpatial s technology couples a laser with a real time digital video system to offer computer guided surgery that stands to replace traditional orthopedic sawsdrillsand cauterization toolsThe digitalD video system is two miniaturized CMOS based cameras built into the laser handpieceBy eliminating mechanical tools an unobstructedintra operative view of the surgical site is possible for the first time everIn between the laser pulsesthe cameras flash to capture an unobstructed view of the surgical siteThe dual cameras are connected to aD displayAdvances in autostereoscopicD displays have eliminated the need forD glassesreferred to asglasses freeand enabled wide angle viewingD viewing of the surgical area promotes increased spatial understanding of complex ambiguous scenes and enhances surgical efficiencyMcIntireCoupling image recognition software with theD vision enables AI measurement and computer assisted navigationOrthopedic surgical successmeasured as less patient pain and fewer revisionshas been shown when measurement and navigation are usedbut existing systems are expensive and slowA laser surgical hand piece coupled with HDD vision and measurement will enable more accurate implant placement and restored range of motion while reducing infections and decreasing surgical timesThis SBIR program modelstestsand demonstratesD viewing including digital zoomInitially a multi element design is modeled to predict what lens assembles would match with the digital CMOS imager appropriate for the orthopedic HDD applicationSecondly off the shelfOTSlens stacks are chosen based on the optical modelingand are tested to define the balance between the FOVfocal lengthobject distance and image sizeLens stack stereo characteristics are recorded and subsequently derive the forward looking design requirementsAdditionallyvarious illumination levels are explored to determine the optimum lighting for each lens stackA standard vision calibration chartlike Mil StdAis used for alignment and the edge response is used to define spatial resolutionMultiple bone cut samples are measured with a confocal microscope and then viewed inD with the various OTS lens stacksOptical measurement software is used to process the OTS lens camera images and are graphed versus the microscope data to determine peak image performance for spatial resolution The introduction of HD autostereoscopic monitors and high pixel count CMOS global imagers enable aD surgical vision system to aid in orthopedic surgical applications by providingD glasses free and wide angle viewing to improve spatial understanding of joints for faster and more precise surgery