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1604 results about "Spinal column" patented technology

Apparatus and method for determining the relative position and orientation of neurostimulation leads

Interelectrode impedance or electric field potential measurements are used to determine the relative orientation of one lead to other leads in the spinal column or other body/tissue location. Interelectrode impedance is determined by measuring impedance vectors. The value of the impedance vector is due primarily to the electrode-electrolyte interface, and the bulk impedance between the electrodes. The bulk impedance between the electrodes is, in turn, made up of (1) the impedance of the tissue adjacent to the electrodes, and (2) the impedance of the tissue between the electrodes. In one embodiment, the present invention makes both monopolar and bipolar impedance measurements, and then corrects the bipolar impedance measurements using the monopolar measurements to eliminate the effect of the impedance of the tissue adjacent the electrodes. The orientation and position of the leads may be inferred from the relative minima of the corrected bipolar impedance values. These corrected impedance values may also be mapped and stored to facilitate a comparison with subsequent corrected impedance measurement values. Such comparison allows a determination to be made as to whether the lead position and/or orientation has changed appreciably over time. In another embodiment, one or more electrodes are stimulated and the resulting electric field potential on the non-stimulated electrodes is measured. Such field potential measurements provide an indication of the relative orientation of the electrodes. Once known, the relative orientation may be used to track lead migration, to setup stimulation configurations and parameters for nominal stimulation and/or navigation. Also, such measurements allow automatic adjustment of stimulation energy to a previously-defined optimal potential field in the case of lead migration or postural changes.

Marking and guidance method and system for flexible fixation of a spine

A method and system for marking and guiding the insertion of securing members (e.g., pedicle screws) of a spinal fixation device. In one embodiment, the marking and guidance method and system includes the use of a guide tube configured to be inserted into a patient's back until a first end reaches an entry point on or near a vertebral bone of the patient's spinal column, wherein the guide tube includes a hollow cylindrical channel along its longitudinal center axis; a penetrating device configured to be positioned within the cylindrical channel of the guide tube and having a sharp tip configured to protrude outwardly from the first end of the guide tube so as to allow the first end of the guide tube to penetrate through the patient's back muscle and tissue and reach the vertebral bone at the entry point; a marking pin configured to be inserted through the cylindrical channel of the guide tube, after removal of the penetrating device, until a first end of the marking pin having a sharp tip reaches the entry point; and a pushing device configured to be inserted through the cylindrical channel of the guide tube and provide a driving force at a second end of the marking pin, opposite the first end, so as to drive and secure the first end of the marking pin into the vertebral bone, wherein the marking pin identifies the location of the entry point on the vertebral bone for subsequent implantation of a securing member of a spinal fixation device.

Device and method for correcting and stabilizing a deviating curvature of a spinal column

A device for correcting and stabilizing a curvature of a spinal column by anterior fusion including at least two brace holders (1-5), each adapted to be arranged against an associated vertebral body (7-11) in the spinal column. The device also includes a securing means (6, 6') for securing the respective brace holders (1-5) on said vertebral body (7-11), and at least one elongate brace (12), which is adapted to extend through and between said brace holders (1-5) along the extent of the spinal column and be locked thereto. The brace (12) is plate-shaped, and the brace holder (1-5) is designed to support the brace (12) in such a manner that a first flat side of the brace (12) faces the abutment surface of the brace holder (1-5) on said vertebral body (7-11), whereby the brace (12) is deformable in only one geometric plane during mounting in the brace holder (1-5) and during correction. In a method for contacting and stabilizing the curvature, the brace (12) is arranged to extend through the brace holders (1-5), such that the brace (12) is deformed to substantially follow the curvature. The brace is locked in at least one first brace holder (1), whereupon the spinal column, vertebra by vertebra, is corrected while the brace (12) is gradually clamped and locked in the brace holders (1-5).
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