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Image-Guided Surgery
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Thermoplastic-based systems for head and neck fixation
Thermoplastic masks have been a proven method for accurate patient positioning and immobilization in radiation therapy for years. Radiation therapy is, in essence, a form of image-guided non-invasive surgery, and requires close-tolerance patient positioning and rigid fixation.

Our Aquaplast-brand thermoplastic material softens in warm water to form a pliable "mask" that can be formed to the patient's anatomical contours. As it cools, the thermoplastic hardens into a custom, comfortable mold for rigid fixation throughout the imaging process.

Thermoplastic is available in a perforated, solid, or "composite" material. The material is supported by a reloadable plastic frame. A series of non-metallic acrylic and carbon fiber baseplates offer setups in a supine flat, supine tilted, lateral, or prone position.

BodyFIX™ vacuum-based immobilization system
Motion artifacts are a major source of image degradation in lengthy imaging procedures and high-precision treatments. Rigid fixation of the anatomical area is critical for accurate target localization. The BodyFIX™ system is a unique, effective, and easy-to-use system for rigid immobilization for imaging, treatment, and image-guided surgical procedures, including biopsies.

After positioning a patient on a Vac-Lok vacuum cushion (for reproducible setups), a stabilization cushion, or directly on the couch/table, the body area to be immobilized is covered with the plastic fixation "foil." When the area between the foil and the patient is evacuated, it creates a rigid, homogeneous pressure to the surface of the immobilized body part, eliminating artifacts due to voluntary or involuntary motions.

An optional target positioner serves to mark the isocenter, blockers, and beams, and can be supplied with MR or CT localizer plates.

Vac-Lok™ custom-molded vacuum cushions
This is a fast, cost-effective, and comfortable system. Similar to a "bean bag" chair, a Vac-Lok cushion contains tiny polystyrene beads within a rugged urethane cover. After selecting the appropriate cushion size and shape for the body area to be positioned, simply pace the cushion on the couchtop and position the patient within the soft cushion. Connect the cushion valve to a vacuum "pump," and evacuate a little of the air so that the cushion is "moldable." Shape the cushion around the patient to create a mold or "cradle," and then evacuate the remaining air to create a rigid, custom-formed support. The molded Vac-Lok cushion will retain its shape for up to six weeks, for accurate re-positioning from within an imaging suite, throughout the course of treatment, or into a surgical procedure. The cushion can then be re-inflated and disinfected for another patient.


Harpell Associates Inc.,
1272 Speers Road, Unit 2, Oakville, Ontario, Canada, L6L 2X4
Phone (905) 825-2588, Fax (905) 825-0234, Toll Free: 1-800-387-7168
Email:  Info@Harpell.ca