Placement of local anaesthetic within the adductor canal using ultrasonography is an alternative to femoral nerve blocks for postoperative pain relief after knee joint replacement surgery. The center of the artifact created by the energized microcatheter solenoid was a reliable marker for determining the degree of microcatheter deflection and auto-locating the in vivo microcatheter tip. Our system showed good correlation to response curves and introduced low amounts of MRI noise artifact. Image processing tools were successful in autolocating the in vivo microcatheter tip within MRI SSFP images. Data from two different techniques for measuring the microcatheter tip location within a 1.5 T MRI scanner showed correlation of magnetic deflections to our model (R(2): 0.88) with a region of linear response (R(2): 0.98).
#Pixelstick remote trigger software#
The magnitude and direction of microcatheter deflections were controlled with user hand, foot, and software controls.
Microcatheter tip deflection measurements were performed by evaluating MRI steady-state free precession (SSFP) images and compared to models derived from magnetic moment interactions and composite beam mechanics. Controls mounted in an interventional MRI suite, along with a graphical user interface at the MRI console, were developed with communication enabled via MRI compatible hardware modules. The magnetically-assisted remote control (MARC) microcatheter was magnetically steered within a phantom in the bore of a 1.5 T MRI scanner. The aim of this study was to evaluate a user control system for operating, steering and monitoring this magnetically guided microcatheter. We developed a microcatheter that utilizes micro-electromagnets manufactured on the distal tip, in combination with the magnetic field of a MRI scanner, to perform microcatheter steering during endovascular surgery. Magnetic resonance imaging (MRI) guided minimally invasive interventions are an emerging technology.
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