Wirelessly powered devices for minimally invasive surgery

A system for wirelessly transmitting power using resonant magnetic field power transfer, the system comprising:

• a device including at least one component to be wirelessly powered, the device including an elongate shaft and a capture element including:
• a capture coil disposed within a slider that translates along the elongate shaft of the device, the slider being disposed around the elongate shaft, such that the elongate shaft is disposed through the slider and the capture coil;
• a first capture layer including a material having a skin depth that is less than a thickness of the first capture layer;
• a second capture layer including a material having a relative permeability greater than 80 at a resonant frequency;
• and
• a third capture layer including a non-conductive material, wherein the capture coil is disposed between the second capture layer and third capture layer;
• and
• a source element for wirelessly supplying power to the device, the source element including:
• a source coil;
• a first source layer including a material having a skin depth that is less than a thickness of the first source layer;
• a second source layer including a material having a relative permeability greater than 80 at a resonant frequency;
• and
• a third source layer including a non-conductive material, wherein the source coil is disposed between the second source layer and third source layer, wherein the source coil is disposed around an opening, the opening being sized to allow the elongate shaft of the device to fit therein, the source being located proximate a surgical access point, wherein, with insertion of the slider within the opening of the source for surgical access, the capture coil is disposed sufficiently proximate the source coil to allow power to be wirelessly transmitted from the source coil to the capture coil to power the at least one component of the device.