| 摘要 |
The present invention provides a delivery device for delivering a substance, which comprises a hollow body containing the substance to be delivered, together with an expandible excipient whose volume expands in contact with an aqueous medium such as to expel the substance from the body. The function of the expandible excipient is to positively expel the substance from the body, such as to provide reproducible delivery times. The hollow body is preferably provided with a cap (for example, a hard gelatin cap) which dissolves soon aftet the hollow body has been adminisered to a patient, thereby allowing access of the aqueous medium.
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