Patent ID: 6545523
Filing Date: 2003-04-08
Classification: A61B

Abstract:
An air delivery unit for an endoscope having a closed-space, a pressure in said closed-space being adjusted by measuring the pressure and selectively discharging air in said closed-space, said air delivery unit comprising:a pressure-sensor that outputs a detection pressure-voltage that corresponds to a value of said pressure in said closed-space; a voltage lowering processor that receives the output of the pressure sensor and outputs a lowered pressure-voltage obtained by lowering said detection pressure-voltage; an amplifier that receives the output of the voltage lowering processor and outputs an amplified pressure-voltage obtained by amplifying said lowered pressure-voltage; and an electric power supplier that applies a power-supply voltage to said pressure-sensor and to said amplifier, said voltage lowering processor lowering said detection pressure-voltage to be in a linear range of said amplifier, said amplified pressure-voltage having a linear relationship to said lowered pressure-voltage.