| 摘要 |
<p>PROBLEM TO BE SOLVED: To detect whether or not an injection needle is mixed in used medical instruments when the instruments are dropped into a litter box for medical wastes. SOLUTION: A plurality of receiving coils 22a, 22b, 22c, 22d are arranged parallel to or perpendicularly to a primary magnetic field 23 set up by an oscillation coil 21. When an injection needle 24 exists in or passes through the magnetic field 23 set up by the coil 21 a secondary magnetic field 25 is produced to disturb the magnetic field 23. The change in the magnetic field 23 is picked up by the coils 22a, 22b, 22c, 22d and is signal-processed, thus detecting the existence and position of the needle.</p> |
