3results about How to "Single structure" patented technology

The utility model discloses a combined vernier length measuring structure which comprises a plate-shaped first structural body and a plate-shaped second structural body, wherein the edges of the first structural body and the second structural body are attached. The first structural body comprises at least four straight edges which are connected end to end, the first structural body is provided with at least one concave angle, and a length scale mark is arranged on one straight edge in the horizontal direction of the concave angle; the second structural body comprises at least three straight edges which are connected end to end, the second structural body is provided with at least one convex corner, vernier scale marks are arranged on one straight edge in the horizontal direction of the convex corner, and the concave corner and the convex corner are both right angles; the ruler has the advantages that the principle of a vernier caliper is adopted, the first structural body and the second structural body are used in cooperation, and compared with an existing ruler, the ruler can effectively improve the length measuring precision.

The invention discloses a suspension cell sphere based on self-floating microbubbles as well as a preparation method and application of the suspension cell sphere, and belongs to the technical field of three-dimensional culture of cells. Aiming at the problem of complicated operation caused by dependence on an external field or exogenous matrix in the existing three-dimensional culture technology, the method comprises the following steps: mixing and adsorbing cells and polylysine modified self-floating microbubbles in an adsorption solution, and then inoculating the cells and the polylysine modified self-floating microbubbles to a polydimethylsiloxane hydrophobic pore plate in a liquid drop form; enabling the cell-microbubble complex to float to the top end of the liquid drop to be enriched by utilizing the buoyancy of the self-floating microbubble; transferring the complex to fresh culture liquid drops through a liquid drop sandwich method to realize mild separation of unbound cells; and finally, culturing to form the suspension cell sphere. The method is suitable for preparing multicellular tumor balls and culture kits, and can be used in the fields of drug screening, tumor biological research, tissue regeneration and the like.

This application relates to the field of biomedical polymer materials technology, and discloses a variable-rigidity chest drainage tube based on a stimulus-responsive hydrogel and its preparation method. The variable-rigidity chest drainage tube comprises an interpenetrating network hydrogel, which includes: a chitin first network, prepared by phase inversion from a chitin solution with a mass percentage concentration of 1.5-4.0%; and a polyacrylamide second network, formed by polymerizing a second network precursor solution in the first network. The second network precursor solution comprises: 15-30% w / v acrylamide; 0.1-1.0% w / AAm N,N'-methylenebisacrylamide; and 0.5-2.0% w / AAm ammonium persulfate. This invention utilizes the reversible reconstruction mechanism of hydrogen bonds between the chitin and polyacrylamide networks to maintain high rigidity of the drainage tube before insertion and transform it into high flexibility after placement in body fluid, thus solving the patient discomfort and tissue damage risks caused by excessive rigidity of silicone tubes.