engleski

Design of new endoscopic microsurgical ultrasonic probe

During the last fifteen years a cooperation is established on projects of application of high power ultrasound on the neural tissue, between experts from The Department of Neurosurgery KBC Rebro, School of Medicine, The Brodarski institute, The Center for Clinical Research in Neuroscience, School of Medicine, Zagreb, Croatia. These projects were sponsored by The Ministry of Science and Technology of Republic Croatia. Three generations of ultrasonic devices which can be used in surgery of the brain have been developed. The first device called NECUP-1 (Neurosurgical Endoscope Contact Ultrasound Probe) has been put to use in the year 2000. to improve the procedure of endoscopic ventriculocysternostomy. This was the first time that the ultrasonic wired contact probe was used in the treatment of hydrocephalus, taking place of so far used electric monopolar and bipolar coagulators. The operation was performed with ventriculoscope Aesculap FF 370, Φ = 6.2 mm, with a newly developed ultrasonic probe Ф = 1.6 mm, controlled by a camera. An elastic titanium wire invoked with a high energy ultrasound of approximately 25 kHz frequency was administered in one of the working openings. The tip of the probe was directed to the tissue which had to be removed due to several ultrasonic effects (strong longitudinal vibrations ; cavitation ; “ hammer” effect). Upon completion of the first model we started the development of a new device called NECUP-2 which was then successfully applied in clinical practice in year 2004. That device is composed of ultrasonic generator, ultrasonic probe and additional special instruments made of titanium. During conception and development of device, the computer aided system was used, so special emphasis was placed on manufacturing of instruments which were adjusted for different types of surgical procedures (specific shape of scalpels, cutters and cleaners, etc). In the end of 2008., the third generation of the devices will be finished (UPROMS-1). Six different kinds of ultrasonic probes can be connected to the universal ultrasonic generator, using the ultrasonic concentrators of various shapes (cone, cylindrical, exponential etc.). The probes can be adjusted for different applications (neurosurgery, surgery of the liver, urology, cardio surgery etc.). In this way fully developed and adjusted in frequency, acoustic transformers (concentrators) enable that the additional carrying-out instruments can be connected to them. The specificity of the UPROMS-1 device is that a wire of different length (10-90 cm ; ~ nλ /2 ≈ 25 kHz) and diameter (Ф =1.5, 1.6 and 2 mm) can be used for endoscopic application.

endoscopy; microsurgical; ultrasonic; probe; new; NECUP; UPROMS-1

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