Abstract
We have measured the forces that act on the electrode-bearing surface of an intradural neuromodulator designed to be in direct contact with the pial surface of the spinal cord, as part of our effort to develop a new method for treating intractable pain. The goal was to investigate the pressures produced by this device on the spinal cord and compare them with normal intrathecal pressure. For this purpose, we employed a dual-sensor arrangement that allowed us to measure the response of a custom-designed silicone spinal cord surrogate to the forces applied by the device. We found that the device had a mean compliance of ≈63 μN μm−1, and that over a 3 mm range of compression, the mid-span pressure it exerted on the spinal cord was ≈1.88 × 103 Pa = 14.1 mm Hg, which lies within the range of normal intrathecal pressure in humans.
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