Electroresponsive hydrogel and physiologically active substance release control system
First Claim
1. A physiologically active substance release control system which comprises:
- a biosensor for sensing the presence of an indicator chemical substance in vivo and for generating an electrical output voltage dependent upon the concentration of said indicator chemical substance in vivo,an amplifier for receiving said electrical output voltage and for amplifying said voltage and providing an output signal corresponding thereto, andan electroresponsive hydrogel containing a physiologically active substance for receiving said output signal from said amplifier and for contracting in response thereto, thereby releasing said physiologically active substance therefrom.
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Abstract
An electroresponsive hydrogel produced by alkali hydrolysis of a copolymer comprising N-isopropylacrylamide, an ionic monomer and a crosslinking agent; and a physiologically active substance release control system comprising a biosensor, an amplifier and an electroresponsive hydrogel containing physiologically active substance are disclosed. The hydrogel of the present invention is capable of releasing a physiologically active substance alone in an amount corresponding to the applied voltage with excellent reproducibility by contracting and reswelling in good response to the loading and unloading of an external stimulation voltage, it can be advantageously used in a physiologically active substance release control system capable of releasing an essential physiologically active substance in a necessary amount according to changes in physiological conditions. Also, the physiologically active substance release control system of the present invention using this hydrogel is useful for the treatment of various diseases including diabetes mellitus.
114 Citations
9 Claims
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1. A physiologically active substance release control system which comprises:
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a biosensor for sensing the presence of an indicator chemical substance in vivo and for generating an electrical output voltage dependent upon the concentration of said indicator chemical substance in vivo, an amplifier for receiving said electrical output voltage and for amplifying said voltage and providing an output signal corresponding thereto, and an electroresponsive hydrogel containing a physiologically active substance for receiving said output signal from said amplifier and for contracting in response thereto, thereby releasing said physiologically active substance therefrom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification