Neuromodulation : journal of the International Neuromodulation Society
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The objective of this study was to develop a high bit-rate passive method for conveying ENG signals from implants which would work over a wide range of coupling coefficients. A novel method, Passive Phase Shift Modulation, was studied in theory, by simulation, and implemented in the laboratory. A binary signal of 222 kbit/s was passed on a 4-MHz carrier (ratio 1:18) with coil-coil spacings up to 70 mm (coil diameters are 45 and 60 mm) with an addition to the power consumption equivalent to 2 mW in the implant. We conclude that this is a satisfactory method to be used as part an implant for conditional neuromodulation that we are designing.
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In an effort to improve the performance of implantable intrathecal drug delivery systems, a group of physicians experienced in the management of such devices reviewed surgical practices and principles that were associated with low catheter-related complication rates. Clinical study and postmarket data identified physicians whose patients experienced a relatively low rate of catheter-related complications. ⋯ Systemic antibiotic prophylaxis, attention to pump pocket location, and surgical wound closure techniques also were important in reducing the incidence of postoperative device-related complications. Their experience indicates that specific implantation techniques using a variety of catheters and accessories can be expected to reduce the incidence of complications after implantation of intrathecal drug administration systems.
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Cervicogenic headache and cervicobrachialgia are frequent diagnoses of chronic cervical pain. After failure of conservative treatment, an interventional approach may be indicated in the absence of any indication for causal surgical treatment. The pulsed radiofrequency (PRF) technique exposes the nerve to a high-frequency electric field while the temperature of the electrode tip does not exceed 42°C. ⋯ Satisfactory pain relief of at least 50% was achieved in 13 of 18 (72%) patients at 8 weeks. More than one year after treatment, six patients (33%) continue to rate treatment outcome as good or very good. No side effects were reported. j.