Patent ID: 7981120

Claim:
An apparatus comprising: a base, sized and shaped to be secured in or about a pre-existing entry portal in a human or animal subject that includes a target within the subject beyond the entry portal, the entry portal defining an entry plane, and the target defining a target plane that is substantially parallel to the entry plane; and an instrument guide, coupled to the base and configured to be oriented with respect to the base, the instrument guide including a first lumen having a first axis extending through the instrument guide and the entry portal toward the target, the instrument guide also including a plurality of second lumens, each having a respective second axis extending through the instrument guide and the entry portal, each second axis being fixed relative to the first axis and being nonparallel to the first axis, the plurality of second lumens each configured to define corresponding second axes passing through the entry portal, each of the second axes being nonparallel to all others of the second axes, the second axes intersecting a range plane beyond the entry portal, the range plane being substantially orthogonal to the first axis, the second lumens being disposed radially symmetric about the first axis, and each of the second axes and the first axis intersect at a common focus point.