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A trajectory guide for providing access to a target site of a living subject along a desired path comprises a baseplate including a clamp lock, a guide member at least partially contained within the baseplate and having a channel therein, a plurality of adjustable legs each including a first end and

A trajectory guide for providing access to a target site of a living subject along a desired path comprises a baseplate including a clamp lock, a guide member at least partially contained within the baseplate and having a channel therein, a plurality of adjustable legs each including a first end and a second end, wherein the first end is coupled to the baseplate, and a leg lock coupled to each adjustable leg and moveable between an unlocked position and a locked position in order to set a desired length of the adjustable leg, wherein the adjustable legs and the guide member are structured to be adjusted to provide an infinite number of trajectories in three-dimensional space extending through the channel in the guide member toward a target.

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1. A trajectory guide comprising: a guide member;an assembly configured to hold the guide member such that the guide member pivots and rotates with respect to the assembly to obtain a plurality of pivot and rotation alignments between the guide member and the assembly;a lock coupled to the assembly

1. A trajectory guide comprising: a guide member;an assembly configured to hold the guide member such that the guide member pivots and rotates with respect to the assembly to obtain a plurality of pivot and rotation alignments between the guide member and the assembly;a lock coupled to the assembly configured to lock the guide member in a particular alignment of the plurality of pivot and rotation alignments;a plurality of legs coupled to the assembly configured to extend from the assembly and position the assembly and the guide member above a surface of a patient, such that a pivot point of the guide member is provided above the surface of the patient; anda trajectory tool configured to orient the guide member in a particular trajectory of a plurality of trajectories by concurrently controlling selection of: one of the plurality of pivot and rotation alignments between the guide member and the assembly, a pivot point alignment of a plurality of pivot point alignments between the assembly and a first end of at least one of the plurality of legs, one of a plurality of pivot and rotation alignments between each of a plurality of feet affixed to the surface of the patient and a corresponding second end of each of the plurality of legs, and an adjustment amount of an adjustable length of at least one of the plurality of legs. 2. The trajectory guide of claim 1, wherein the assembly is a ball-joint, where the guide member has a substantially ball shape, which is held between a first disk having a first hole and a second disk having a second hole included in the assembly. 3. The trajectory guide of claim 2, wherein the first disk is coupled to the second disk with a hinge joint. 4. The trajectory guide of claim 3, wherein: a lock includes a lock base that is fixed to the first disk and an adjustable lever that extends from the lock base, andthe adjustable lever engages the second disk to squeeze the second disk towards the first disk in a locked position in which the guide member is locked in the particular alignment relative to the assembly, and the lever disengages the second disk in an unlocked position in which the guide member pivots and rotates with respect to the assembly. 5. The trajectory guide of claim 4, wherein each of the plurality of the legs is coupled to and extends from the first disk by a leg hinge joint. 6. The trajectory guide of claim 1, wherein the guide member includes a channel extending therethrough that coincides with the particular alignment. 7. The trajectory guide of claim 6, wherein the guide member includes a fastener at an end of the channel that is structured to fasten the guide member to an apparatus or device at an alignment that coincides with the particular alignment. 8. The trajectory guide of claim 1, wherein the at least one of the plurality of legs includes an adjustable portion that adjusts the adjustable length. 9. The trajectory guide of claim 8, wherein the adjustable portion is configured to adjust the adjustable length by sliding a first leg portion and a second leg portion relative to each other, the first leg portion and the second leg portion being included in the adjustable portion. 10. The trajectory guide of claim 9, wherein the second leg portion includes a channel structured to receive the first leg portion. 11. The trajectory guide of claim 8, wherein the at least one of the plurality of legs includes a leg lock configured to lock a position between first and second leg portions of the adjustable portion. 12. The trajectory guide of claim 11, wherein: the leg lock includes a lock base that is fixed to the first leg portion and an adjustable lever that extends from the lock base,the adjustable lever includes a plurality of teeth,the teeth of the adjustable lever engage teeth of the second leg portion to lock the position between the first and second leg portions when the adjustable lever is in a locked position, and the teeth of the adjustable lever disengage the teeth of the second leg portion when the adjustable lever is in an unlocked position. 13. The trajectory guide of claim 1, wherein the plurality of feet are attached to the plurality of legs. 14. The trajectory guide of claim 13, wherein each of the plurality of legs includes a ball and each of the plurality of feet includes a cavity that receives the ball and forms a ball joint. 15. The trajectory guide of claim 14, wherein each of the plurality of feet includes a detachably attached foot cap that holds the ball in the cavity. 16. The trajectory guide of claim 1, wherein the plurality of legs are telescoping legs. 17. The trajectory guide of claim 1, wherein the trajectory guide is magnetic resonance imaging (MRI) compatible. 18. The trajectory guide of claim 17, further comprising: one or more fiduciary markers that are visible in an MRI scan. 19. The trajectory guide of claim 18, wherein a first fiduciary marker of the fiduciary markers is provided in the guide member, the first fiduciary marker having a predefined shape that has a predefined relationship with the particular alignment, such that the particular alignment is discernable from the MRI scan via the first fiduciary marker. 20. A trajectory guide comprising: guide means for guiding an instrument or an apparatus along a particular trajectory towards a target beneath a surface of a patient;assembly means for holding the guide means and allowing the guide means to rotate and pivot in a plurality of pivot and rotation alignments, with respect to the assembly means;locking means for locking the guide means in a particular alignment of the plurality of pivot and rotation alignments, the particular alignment being associated with the particular trajectory;support means for supporting the assembly means and the guide means above the target and the surface of the patient, such that a pivot point of the guide means is provided above the surface of the patient; andtrajectory tool means for orienting the guide means in the particular trajectory of a plurality of trajectories by concurrently controlling selection of: one of the plurality of pivot and rotation alignments between the guide means and the assembly means, a pivot point alignment of a plurality of pivot point alignments between the assembly means and a first end of the support means, one of a plurality of pivot and rotation alignments between affixing means for affixing to the surface of the patient and a corresponding second end of the support means and, and an adjustment amount of an adjustable length of the support means. 21. A method for setting a trajectory of a trajectory guide, the trajectory guide comprising: a guide member;an assembly configured to hold the guide member such that the guide member pivots and rotates with respect to the assembly to obtain a plurality of pivot and rotation alignments between the guide member and the assembly;a lock coupled to the assembly configured to lock the guide member in a particular alignment of the plurality of pivot and rotation alignments;a plurality of legs coupled to the assembly configured to extend from the assembly and position the assembly and the guide member above a surface of a patient, such that a pivot point of the guide member is provided above the surface of the patient; anda trajectory tool configured to orient the guide member in a particular trajectory of a plurality of trajectories,the method comprising:obtaining the particular trajectory by concurrently controlling, by the trajectory tool, selection of: one of the plurality of pivot and rotation alignments between the guide member and the assembly, a pivot point alignment of a plurality of pivot point alignments between the assembly and a first end of at least one of the plurality of legs, one of a plurality of pivot and rotation alignments between each of a plurality of feet affixed to the surface of the patient and a corresponding second end of each of the plurality of legs, and an adjustment amount of an adjustable length of at least one of the plurality of legs. 22. The method according to claim 21, further comprising: attaching an apparatus or device to the guide member such that the attached apparatus or device is introduced to the patient at the surface of the patent in accordance with the particular trajectory.