Cell structure for brain damage treatment, production method thereof, and brain damage treatment agent

A method for treating brain damage, the method comprising:

• a step of administering a cell structure for brain damage treatment to a patient with brain damage,
• wherein the cell structure for brain damage treatment contains biocompatible macromolecular blocks and at least one kind of cell and a plurality of the biocompatible macromolecular blocks are disposed in gaps between a plurality of at least one kind of cell,
• wherein the tap density of the biocompatible macromolecular block is 10 mg/cm3 to 500 mg/cm3 or a value obtained by dividing a square root of a cross-sectional area in a two-dimensional cross-sectional image of the biocompatible macromolecular block by a peripheral length is 0.01 to 0.13,
• wherein the biocompatible macromolecular block is a biocompatible macromolecular block produced through a method including
• a step (a) of freezing a solution of biocompatible macromolecules through freezing treatment in which the highest internal liquid temperature, which is a liquid temperature in a portion having the highest liquid temperature within the solution, becomes lower than or equal to a temperature which is 3° C. lower than a melting point of a solvent in an unfrozen state, and
• a step (b) of freeze-drying the frozen biocompatible macromolecules which have been obtained in the step (a).