Retractor systems, devices, and methods for use

Described here are devices, systems, and methods for moving and/or supporting an internal organ or other tissue, such as during minimally-invasive surgery. Generally, a system for moving and/or supporting tissue may comprise a magnetic control component and a retractor having at least one magnetic portion. The retractor may have a first low-profile configuration for passing through an incision into a surgical site within a patient and a second expansive configuration for engaging tissue. The magnetic control component may be placed over the surgical site external to the patient and generate a magnetic field to manipulate the retractor and engaged tissue.