Patent ID: 8211067

Claim:
A mechanical system at least comprising: a chemical solution syringe including a cylinder member filled with a chemical solution, and a piston member slidably inserted into the cylinder member; and a chemical solution injector for injecting the chemical solution into a patient by relatively moving the cylinder member and the piston member of the chemical solution syringe mounted removably; further comprising a consumption storage means put on the chemical solution syringe for storing at least data of a consumption degree such that it can be updated, wherein the chemical solution injector includes: a piston driving mechanism for pressing the piston member into the cylinder member of the held chemical solution syringe; data reading means for reading the data of the consumption degree from the consumption storage means on the mounted chemical solution syringe; consumption holding means for temporarily holding the read data of the consumption degree; consumption detecting means for updating the temporarily held data of the consumption degree; consumption determining means for determining whether or not the temporarily held consumption degree exceeds a predetermined consumption reference; alarm notifying means for outputting and notifying a predetermined replacement announcement when it is determined that the consumption degree exceeds the consumption reference; and data writing means for writing the updated data of the consumption degree to the consumption storage means on the chemical solution syringe; and wherein the consumption degree is an accumulation of the pressure of the piston member, and the consumption detecting means updates the data of the consumption degree in accordance with the pressure applied to the piston member by the piston driving mechanism.