The blood leak detection device of the present invention includes a light source, a light receiving element, and a control means connected to the light source, and the light source covers the lower surface of a cloth-like blood leak receiving member disposed below the blood leak location. The light receiving element is disposed at a position to illuminate, and the light receiving element is disposed at a position capable of receiving the reflected light emitted from the light source and reflected by the lower surface of the blood leakage receiving member. The control means includes a light receiving intensity of the reflected light at a predetermined first wavelength within a range of red light having a wavelength of 620 nm or more and 750 nm or less, which is a light reflection band of blood, among wavelengths of reflected light received by the light receiving element. , And the received light intensity of the reflected light at one or more other wavelengths less than 620 nm. Thereby, it can be detected from the back side of the drape whether the liquid adhering on the drape is blood. As a result, there are few malfunctions due to liquids other than blood.本発明の血液漏出検知装置は、光源と、受光素子と、これらと接続される制御手段と、を備え、光源は、漏血箇所の下方に配置された布状の漏血受け部材の下面を照らす位置に配設され、受光素子は、光源から出射され前記漏血受け部材の下面で反射した反射光を受光可能な位置に配設されている。制御手段は、受光素子により受光された反射光の波長のうち、血液の光反射帯である波長６２０ｎｍ以上７５０ｎｍ以下の赤色光の範囲内の、予め定める第１の波長における反射光の受光強度と、波長６２０ｎｍ未満の、１つ以上の他の波長における反射光の受光強度とを、取得可能である。これにより、ドレープ上に付着した液体が、血液であるか否かを、ドレープの裏面側から検出することができる。その結果、血液以外の他の液体による誤動作が少ない。
