Blood coagulation time measuring device
First Claim
1. A blood coagulation time measuring device, comprising a container, channel means extending into said container for forming a measuring channel for supporting a measuring vessel within said container, stirrer drive means in the region of said channel means for rotating a stirring rod placed inside the measuring vessel, a light detector assembly in said container including a light source and a photo-electric cell for determining the degree of coagulum formation in the measuring vessel wherein a light beam is transmitted from said light source through the measuring vessel in said measuring channel and onto said photo-electric cell which produces a corresponding output, light balancing means coupled to said light source and said photo-electric cell for adjusting the brightness of the light beam from said light source in corresponding relationship to the level of light received by said photo-electric cell wherein said brightness corresponds to the turbidity of liquid in the measuring vessel, display means for indicating blood coagulation time, and control switch means coupled to said light balancing means for controlling said stirrer drive means and said display means in response to operation of said light balancing means.
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Accused Products
Abstract
A blood coagulation time measuring device includes a stirrer drive arrangnt for rotating a stirring rod placed inside the measuring vessel when the vessel is inserted in a measuring channel of the device. A light detector assembly within the device determines the degree of coagulation formation in the measuring vessel by transmitting a light beam from a light source through the measuring vessel and onto a photo-electric cell. Light balancing circuitry coupled to the light source and the photo-electric cell automatically adjusts the brightness of the light from the light source in correspondence with the turbidity of liquid in the measuring vessel. A control switch arrangement operates to turn the stirrer drive arrangement on or off in response to operation of the light balancing circuitry.
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Citations
6 Claims
- 1. A blood coagulation time measuring device, comprising a container, channel means extending into said container for forming a measuring channel for supporting a measuring vessel within said container, stirrer drive means in the region of said channel means for rotating a stirring rod placed inside the measuring vessel, a light detector assembly in said container including a light source and a photo-electric cell for determining the degree of coagulum formation in the measuring vessel wherein a light beam is transmitted from said light source through the measuring vessel in said measuring channel and onto said photo-electric cell which produces a corresponding output, light balancing means coupled to said light source and said photo-electric cell for adjusting the brightness of the light beam from said light source in corresponding relationship to the level of light received by said photo-electric cell wherein said brightness corresponds to the turbidity of liquid in the measuring vessel, display means for indicating blood coagulation time, and control switch means coupled to said light balancing means for controlling said stirrer drive means and said display means in response to operation of said light balancing means.
Specification