Guides and tools for multi-portal spine procedures, and associated systems and methods

A spinal surgical system for use in a multi-portal spine procedure on a patient, the spinal surgical system comprising:

• a spinal needle having a handle and a needle coupled to the handle, wherein the needle is configured to be inserted into the patient until the needle reaches a target site;
• a plate guide selector configured to be positioned on the patient and including a first plate guide indicator and a second plate guide indicator, wherein the plate guide selector is positionable relative to the spinal needle, wherein positioning the first plate guide indicator adjacent to the spinal needle indicates a first depth in the patient, and wherein positioning the second plate guide indicator adjacent to the spinal needle indicates a second depth in the patient;
• a first angle plate guide corresponding to the first plate guide indicator, wherein the first angle plate guide has a first pair of guiding ramps angled such that a first pair of imaginary lines extending along the first pair of guiding ramps intersect inside the patient substantially at the first depth;
• and
• a second angle plate guide corresponding to the second guide indicator, wherein the second angle plate guide has a second pair of guiding ramps angled such that a second pair of imaginary lines extending along the second pair of guiding ramps intersect inside the patient substantially at the second depth,
• wherein each of the first angle plate guide and the second angle plate guide is configured to facilitate triangulation of surgical instruments and/or visualization instruments toward the target site.