| 摘要 |
<p>An implant consists of a semi-permeable membrane, typically in the form of a liposome (1, 2) containing a biologically active agent (4). Release of the agent is controlled by applying a rf field externally, so as to modify the permeability characteristics of the liposome as presented to the agent. The rf field may be applied from a portable transmitter (10-14) carried by the patient. A timer may be included to control dosage periods.</p> |
