| 摘要 |
<p>A system (2, 3) for locating an implantable medical device (4) consists of flat 'pancake' antenna coil comprising an antenna array (3) which is external to the patient. The antenna array (3) consists of three or more separate antennas (30-32) which are used to sense the energy emitted from the implanted antenna coil positioned concentric with the implantable medical device target, e.g. a drug reservoir septum (11). The system senses the proximity to the implant coil (22) and, thus, the implant device (4) by determining when an equal amount of energy is present in each of the antennas (30-32) of the antenna array (3) and if each such ducted energy is greater than a predetermined minimum. When such condition is met, the antenna array (3) is aligned with the implant coil (22). Thus a needle port through the antenna array is lined up with the septum (11) of the drug reservoir (10). Alternative embodiments are further disclosed in which the processor and antenna array are positioned within the implanted device while the coil is external to the patient.</p> |
