Abstract: This document discusses, among other things, examples of a shunt passer or like surgical instrument configured for receiving different-sized positioning locators of an image guided surgical system. In one example, the surgical instrument includes portions having different diameters for receiving the different-sized affixation mechanisms for the positioning locators.

Abstract: This document discusses, among other things, a fiducial marker kit. In one example, the kit includes a fiducial marker assembly that includes a bone screw base for receiving an imageable marker or locatable divot. A valved protective sleeve prevents debris from accumulating in a receptacle portion of the base, which may otherwise degrade the accuracy of patient registration in an image-guided surgical procedure. In one example, the valve automatically opens or closes upon insertion or removal of a screwdriver or other tool, or a shaft portion of the imageable marker or locatable divot. Various bone screw base and receptacle combinations are also discussed.

Abstract: This document discusses, among other things, fiducial marker devices, tools, and methods. One example illustrates a combined computed tomography (CT) imagable fiducial locator head, an integral bone screw, and an integral divot for receiving a positioning wand of an image-guided surgical (IGS) workstation. A further example includes a fluid/gel-absorbing coating or cover into which a magnetic resonance (MR) imagable fluid is introduced, thereby permitting both CT and MR imaging. Protective caps and collars may be used to protect the fiducial marker from mechanical impact and/or to guide the fiducial marker during affixation. A bull's-eye or other template is used to select a center of a substantially spherical fiducial marker head on an image, such as for use during patient registration.

Abstract: This document discusses, among other things, a stiffening stylet for use with a peel-away or other sheath. The stylet includes an MR-compatible ceramic core and an MR-compatible tubular covering, such as a polyester heat shrink tubing. The ceramic core and the tubular covering together provide a step to engage a stop feature of the sheath to inhibit overextension of the stylet beyond a distal end of the sheath.

Abstract: This document discusses, among other things, examples of a low profile instrument immobilizer and means for positioning the same. In one example, the low profile instrument immobilizer grasps, secures, and immobilizes an electrode or other instrument that extends through a burr hole in a skull to a target location in a patient's brain.

Abstract: An alignment device and method is provided. Higher precision is achieved when fixing an orientation of an insertion axis using alignment devices shown. A symmetric clamping force is provided that reduces or eliminates unwanted displacement after the desired orientation is obtained. Another feature includes increased flexibility to use a variety of primary medical devices. Another feature includes a standoff feature that reduces tissue damage. Another feature includes an orienting fixture for image guided procedures.

Abstract: This document discusses, among other things, examples of a shunt passer or like surgical instrument configured for receiving different-sized positioning locators of an image guided surgical system. In one example, the surgical instrument includes portions having different diameters for receiving the different-sized affixation mechanisms for the positioning locators.