Abstract: A coating material composition containing polytetrafluoroethylene, a binder resin, and a filler being at least one kind selected from calcium fluoride, iron oxide and talc, wherein the content of N-methyl-2-pyrrolidone is less than 1% by weight of the composition. Also disclosed is a coating film formed of the coating material composition.

Abstract: To provide a liquid medicine self-injection system that enables patient himself/herself to easily and safely inject (in particular, bolus-infuse) a prescribed amount of liquid medicine for preventing, treating or improving obstetrical pain, in particular, for a painless childbirth. The liquid medicine self-injection system according to the present invention contains a liquid medicine preservation container for storing a liquid medicine, a liquid medicine feeding-out means for feeding out the liquid medicine from the liquid medicine preservation container, and a liquid medicine injection device for allowing the liquid medicine fed out from the liquid medicine preservation container to be self-injected, and is configured to be able to use for preventing, treating or improving obstetrical pain, in particular, for a painless childbirth.