A new drug delivery system (DDS), ciprofloxacine/tricalcium phosphate delivery capsule (CTDC) was developed by loading a broad-spectrum antibiotic ciprofloxacine into the central cylindrical cavity of tricalcium phosphate capsule. The new system showed good biocompatibility and could degrade gradually in our preliminary studies. In vitro study showed that CTDC could mantain highlevel and long-term releae of ciprofloxacine and that ultrasonic irradiation within the range of physical therapy could increase the drug release amount from CTDC(P<0. 02), and might become a new technique to achieve the control of drug release from DDS.
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