08-03-2012 дата публикации
Номер: US20120058193A1
Принадлежит:
An injectable smart gel and a method for fabricating the same are disclosed. A basic structural stabilizer/polymeric electrolyte and a diluting solution are added to a modified chitosan to regulate the chitosan solution to have a pH value closing to that of the human body and form a flowable chitosan sol. The flowable chitosan sols formed thereby are respectively converted into inflowable chitosan gels via increasing the temperature thereof to the human body temperature, and via adding calcium ion or regulating the chitosan sol into an acidic solution. The injectable smart gel fabricated thereby is injectable and able to function as a carrier of magnetism-sensitive medicine-containing nanocapsules. The medicine can be released to the injectable smart gel with an external non-contact force, such as a magnetic field, an electric field or an ultrasonic wave, for long-acting and multi-stage medicine delivery. The present invention is very useful in biomedical engineering. 1. A method for fabricating an injectable smart gel , comprising steps:providing a hydrophobically-modified or amphiphilically-modified chitosan solution with a concentration of 0.1-10% (w/v); andat a temperature of 4-20° C., adding 0.1-10% (w/v) of a basic structural stabilizer and 80-99.5% (w/v) of a diluting solution to said modified chitosan solution to regulate said modified chitosan solution to have a pH value of 5-9 and form a near-neutrality chitosan sol, which becomes a solid chitosan gel when temperature rises to 30-40° C.2. The method for fabricating an injectable smart gel according to claim 1 , wherein said diluting solution is water or a mixture of water and an oil-like compound claim 1 , and wherein said oil-like compound is selected from a group consisting of DMSO (dimethyl sulfoxide) claim 1 , alcohol claim 1 , glycol and glycerin.3. The method for fabricating an injectable smart gel according to claim 1 , wherein said basic structural stabilizer is selected from a group consisting of ...
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