A kind of injectable polyhydroxyalkanoate microsphere and preparation method thereof

Abstract

The invention relates to the technical field of biomedicine, and specifically discloses an injectable polyhydroxyalkanoate (PHA) microsphere and a preparation method thereof. The preparation method of the injectable polyhydroxyalkanoate microspheres comprises: a) dissolving the PHA material in an organic solvent to obtain an oil phase; b) dissolving hyaluronic acid in water to obtain an aqueous phase; c) under stirring conditions Next, add the oil phase to the water phase dropwise, after the dropwise addition, continue to stir to volatilize the organic solvent, and then perform solid-liquid separation and drying to obtain PHA microspheres; the steps a) and b) ) has no order restriction. The above method of the present invention can improve the dispersibility of the PHA microspheres, and the obtained microspheres can be quickly dispersed in water, the microspheres are complete in shape, independent of each other, and have no agglomeration phenomenon, thereby avoiding clogging of the needle and facilitating subsequent injection as a filler. Moreover, PHA microspheres have excellent biocompatibility and will not cause rejection, and can achieve long-term filling effects.

Description

technical field [0001] The invention relates to the technical field of biomedicine, in particular to an injectable polyhydroxyalkanoate microsphere and a preparation method thereof. Background technique [0002] As humans age or are affected by certain diseases, the muscle and collagen tissue in the human body will have different degrees of functional degeneration, causing skin depressions, gastric reflux and other problems. Therefore, people have invented a variety of fillers to improve Fill in sunken skin or stimulate muscle and collagen regrowth through foreign substances, such as hyaluronic acid, bovine collagen, etc. However, the filling effect of these substances as fillers lasts for a short period of time, and frequent injections are required to maintain the filling effect. In order to achieve a long-term filling effect, people have tried to use biodegradable materials to make microspheres as fillers, such as polyvinyl alcohol (PVA), polymethyl methacrylate (PMMA) an...

AI Technical Summary

Problems solved by technology

[0006] The first-generation PHA material PHB is the most common and the earliest product in PHA. It has good biocompatibility, biodegradability, piezoelectricity, gas barrier property, optical properties, etc., and can be used to prepare one-time Permanent plastic products, agricultural embedding agents, drug corrosion inhibitors, human tissue structure, fibers, etc., its disadvantage is that the crystallinity is as high as 80%, easy to decompose, generally not used in the field of plastics

[0007] The second-generation PHA material, PHBV, is a copolymer of hydroxybutyrate and hydroxyvalerate. The addition of hydroxyvalerate monomers has significantly changed the crystal structure of the polymer, and the overall regularity of the crystals has decreased. Compared with the first-generation PHB, the hardness is significantly lower, and the elasticity is highly related to hydroxyvalerate, but because hydroxyvalerate and hydroxybutyrate have relatively similar lamellar structures, there is obvious post-crystallization in the copolymerized material phenomenon, affecting the stability of product performance

However, the microspheres produced by this process are very easy to agglomerate and stick together to form larger lumps, which brings inconvenience to subsequent injections and greatly hinders the application of biodegradable material microspheres as fillers.

Therefore, there is an urgent need for a new type of microsphere preparation solution to solve the problem of easy aggregation and adhesion of microspheres

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