Patent ID: 7970457
Filing Date: 2011-06-28
Classification: A61B,A61M

Abstract:
1. A leak detecting apparatus which detects leak of a liquid injected through an injection needle into a blood vessel of a human body near a surface thereof, comprising: at least one light ray emitting means for emitting a light ray in a predetermined wavelength band containing at least one particular wavelength at which the reflectivity for the liquid is higher than the reflectivity for internal tissues of the human body, to the human body at a position thereof where the injection needle is inserted; at least one light ray detecting means for detecting the light ray in the wavelength band reflected inside the human body; first measuring means for measuring the intensity of the detected light ray at the particular wavelength; second measuring means for measuring the average intensity of the detected light ray in the wavelength band; ratio calculating means for calculating the ratio of the intensity at the particular wavelength to the measured average intensity; leak determining means for determining occurrence of leak when the calculated ratio is higher than a predetermined reference value; and leak alarming means for outputting and notifying a leak alarm when the occurrence of leak is determined.