Multi-portal split cannulas, endoscopic hemostatic dispensers and surgical tools

A multi-portal method for treating a subject, the method comprising:

• inserting a visualization instrument into a first entrance formed in the subject;
• inserting a distal end of a split cannula into a second entrance formed in the subject, wherein the second entrance is spaced apart from the first entrance, wherein the split cannula includes a proximal end with a flange configured to contact the subject's skin when the split cannula is positioned in the second entrance;
• and
• manipulating tissue at a target site in the subject using a distal end of a surgical instrument positioned along a passage of the split cannula while viewing the tissue and the distal end of the surgical instrument using the visualization instrument extending through the first entrance.

A multi-portal method for treating a subject's spine, the method comprising:

• inserting a visualization instrument into a first entrance in a subject;
• inserting an open-channel split cannula into a second entrance in the subject, wherein the second entrance is separate from the first entrance, wherein the split cannula includes a flange configured to contact the subject's skin;
• and
• manipulating tissue at a target site in the subject using at least one instrument positioned along the open-channel split cannula while viewing the target site and the at least one instrument using the visualization instrument positioned through the first entrance.