55results about How to "Long degradation cycle" patented technology

The invention discloses a preparation method of absorbable medical suture with good tensile strength. Polyethylene glycol monomethyl ether is taken, inert gas is introduced, the temperature is raised, and the temperature is kept until the polyethylene glycol monomethyl ether melts, and zinc lactate is added. , lactide, mix evenly, heat up, keep warm and stir, and purify to obtain the intermediate material; add carboxymethyl chitosan to dissolve in water, add the intermediate material, stannous chloride, mix evenly, feed inert gas, heat up, keep warm, and purify to obtain modified chitosan; the modified chitosan, diisopropylcarbodiimide, glucose and cinnamon oil are mixed evenly, and the absorbable medical suture thread with good tensile strength is prepared according to the method of melt spinning. The suture prepared by the invention has good tensile strength, is easy to knot, has high mechanical properties, and has good compatibility with biological tissues, and cells are easy to adhere and multiply on the suture prepared by the invention.

The invention relates to the field of disposable hygiene products, and discloses a reinforced structural diaper with a composite core, which includes a diaper body, and the diaper body is composed of an air-permeable surface layer, a diversion layer, a composite core body, and a leak-proof bottom layer. Bonded with degradable hot-melt adhesive, the composite core consists of a dust-free paper, an upper absorbent layer, an elastic layer, a lower absorbent layer, and a spun-bonded non-woven fabric from top to bottom, and the upper absorbent layer includes a middle area and a Anti-side leakage areas on both lateral sides of the middle area, the middle area has several upper absorption sections distributed along the longitudinal direction, each of the upper absorption sections is arranged at intervals, and the distribution density of the superabsorbent resin on the anti-side leakage area is greater than The upper absorbing section, the lower absorbing layer is longitudinally distributed with several lower absorbing sections, each of the lower absorbing sections is arranged at intervals, and the layers of the composite core are bonded by degradable hot-melt adhesives. It solves the problem that the existing paper diapers are easy to agglomerate, break and delaminate, and the hot melt adhesive used for bonding has good bonding effect and is degradable.

The invention discloses a method for preparing absorbable medical sutures. The method includes the steps that chitosan is added into water to be evenly dispersed, fumaric acid is added to be evenly mixed, sulfuric acid is added, heating is carried out, and stirring is carried out in a heat preservation mode to obtain a solution A; purification is carried out to obtain modified chitosan; glycerin, stannous octoate and lactide are evenly mixed, inert gas is introduced, heating is carried out, stirring is carried out in a heat preservation mode, and purification is carried out to obtain intermediate materials; the modified chitosan is added into water to be dissolved, triethylamine is added to be evenly mixed, heating and refluxing are carried out, the intermediate materials are added to be evenly mixed, refluxing and purification continue to be carried out, and drying is carried out to obtain modified polylactic acid; the modified polylactic acid, epoxidized soybean oil, genipin and castor oil are evenly mixed to be prepared into the absorbable medical sutures with a melt spinning method. The sutures prepared with the method are good in antibacterial performance and inflammation resistance, the mechanical performance is good, the compatibility with biological tissues is good, and cells can be easily attached to and bred on the sutures prepared with the method.

The invention relates to a tissue-guided regeneration collagen film and a preparation method thereof. The preparation method is as follows: swell type I collagen in an acetic acid solution, then add sodium chondroitin sulfate and stir evenly to obtain a collagen-chondroitin sulfate sodium slurry; dry the collagen-chondroitin sulfate sodium slurry, Obtain a dry film; mix the dry film with the cross-linking liquid, carry out the cross-linking reaction, and obtain a cross-linked collagen film after completion; clean the cross-linked collagen film and perform secondary drying to complete Then repress it. In the preparation method, high-concentration type I collagen is first swelled in acetic acid solution, and sodium chondroitin sulfate is added to stir, followed by drying, cross-linking, and secondary drying, and the obtained tissue-guided regeneration collagen film has excellent mechanical properties , and the pore size and porosity are conducive to cell growth and repair; in addition, its degradation cycle is long and it is not easy to cause allergies. The comprehensive effect is comprehensive and the applicability is wide.