| 摘要 |
<p>Apparatus and method for detecting the coagulation of a sample of blood includes a ferromagnetic member (16), which is immersed in the blood sample (14) and which is magnetically coupled to a reed switch (26), and an adjustable source (28) of magnetic flux lines, which is also magnetically coupled to the reed switch. As the blood sample coagulates, the ferromagnetic member is displaced from the reed switch and, as a result the magnetic field coupled to the reed switch is reduced. When the ferromagnetic member reaches a predetermined displacement, the reed switch is open, which indicates that blood has coagulated. A microprocessor (30) calibrates the reed switch by adjusting the density of the magnetic flux lines from the adjustable source such that the reed switch is open when the ferromagnetic member reaches the predetermined distance displacement.</p> |
