Abstract: The present invention relates to a bioadhesive that includes at least two constituents that are intended to be combined, for simultaneous, separate, or time-shifted use, i.e.: 1) a semi-liquid constituent (A) that includes, at a minimum, gelatin in an aqueous solution; and 2) A constituent (B), in gel or non-gel form, that includes, at a minimum, an aldehyde, with the exception of non-gel solutions consisting of formaldehyde, glutaraldehyde, or glyceraldehyde. The invention also relates to the use of succinic dialdehyde and of aldehyde solution sin gel form as hardeners in a bioadhesive, and further relates to a procedure for the preparation of the said bioadhesives and to a device for the application of the said bioadhesives.