| 摘要 |
<p>The present invention provides a peripheral nerve stimulator (10) of low magnetic susceptibility that can be used in the high magnetic field of an MRI suite. Non-magnetic lithium batteries power the peripheral nerve stimulator. A stack of capacitors, and diodes (hereinafter 'components') forming a voltage multiplier (20) replace the conventional step-up transformer. Each component is carefully chosen for low content of the magnetic materials. To minimise the number of components, and enable the magnetically compatible peripheral nerve stimulator to be a handheld instrument, a full H bridge supplies power to the multiplier. The power is an AC signal with voltage equal or plus or minus to the supply voltage. This provides a peak to peak voltage value of two times the available battery voltage. This approach reduces the number of capacitors, and diodes to half compared to the half bridge solution.</p> |
