OBJECTIVETo explore a new injectable material.

METHODSMicronized swine acellular dermal matrix was injected into the ear of rabbits. The augmentation was observed and measured with pathological and transmission electron microscopic technique.

RESULTSThere were fibroblasts and capillaries in the injected material. The absorption rate of injected acellular dermal matrix was 26.93% in the experimental group at 48 weeks after injection.

CONCLUSIONThe acellular dermal matrix is an ideal injectable material for lower absorption and easy usage.

Acellular Dermis ; Animals ; Biocompatible Materials ; administration & dosage ; Ear Auricle ; Fibroblasts ; Injections ; Rabbits ; Swine

Extra-luminal flow hollow fiber membrane oxygenator (ELFHFMO) has been widely applied in cardiopulmonary bypass (CPB) and extracorporeal membrane oxygenation (ECMO) or extracorporeal life support (ECLS) because of its advantages over other types of MO. But its low hemocompatibility and durability are the major problems in clinical application that even have limited its wide application. In this paper, we reviewed the recent researches on how to improve the hemocompatibility and durability of ELFHFMO.
Coated Materials, Biocompatible ; Extracorporeal Membrane Oxygenation ; instrumentation ; Heparin ; administration & dosage ; Humans ; Oxygenators, Membrane ; trends

In this paper, the advance of polymeric materials applied in the development of traditional Chinese medicine (TCM) and natural products was reviewed. Especially the research progresses in use of the polymeric membranes, polymeric flocculating agents, polymeric sorbents and polymeric drug delivery system (DDS) in the separation and preparation of herb and TCM were discussed in details. In addition, the future develorment of polymeric materials in TCM preparation was also discussed.
Administration, Cutaneous ; Biocompatible Materials ; Drug Delivery Systems ; Drugs, Chinese Herbal ; administration & dosage ; isolation & purification ; Polymers ; Technology, Pharmaceutical ; methods ; Ultrafiltration ; instrumentation

A porous composite particle (CP) was fabricated by the methods of emulsification and cross-link based on chitosan, alginate and collagen protein, and the tranexamic acid-loaded composite particles (TACP) was prepared by immersing the composite particle into the solution of tranexamic acid and by freeze drying. In the hepatic and splenic hemorrhage model of rabbits, CP and TACP were randomly used as haemostatic agents, and the Suxiaozhixuefen (Flashclot) was used as control. The corresponding hemostatic time and bleeding amount were observed respectively. The hemostatic time of CP and Flashclot were (2.48 +/- 0.88) min and (3.07 +/- 0.84) min, respectively, no significant difference was observed. However, the hemostatic time of TACP was (1.90 +/- 0.75) min, which was significantly shorter than that of CP and Flashclot (P < 0.05). In the splenic bleeding model of rabbits, similar results were obtained with these three kinds of hemostatics. These results indicated that the CP based on chitosan, alginate and collagen protein displayed similar hemostatic efficiency to Flashclot. However, the TACP might be one of promising haemostatic powders due to its more excellent hemostatic efficiency.
Alginates ; administration & dosage ; pharmacology ; Animals ; Biocompatible Materials ; chemistry ; Chitosan ; administration & dosage ; pharmacology ; Collagen ; administration & dosage ; pharmacology ; Female ; Hemostatics ; administration & dosage ; pharmacology ; Male ; Rabbits ; Tranexamic Acid ; administration & dosage ; pharmacology

OBJECTIVE: To improve the hemocompatibility of decellular vascular matrix via heparin-iron complex multilayers (HICMs) nanomodification. METHODS: A novel thrombo-resistant surface for decellular xenograft was developed by alternating linkage of dihydroxy-iron and heparin to decellular bovine jugular vein (DC-BJV), and its surface characterization, biomechanical stability and hemocompatibility were detected by scanning electron microscopy, tensile test and hemocompatibility evaluation, respectively. RESULTS: A toluidine blue colorimetric method indicated the amount of linked heparin was about (808±86) μg/cm2 per assembly-cycle. Scanning electron microscopic (SEM) images proved that HICMs were uniformly linked to and formed nanoscale films around the fibrils of DC-BJV. Toluidine blue staining histologic images showed that HICMs were linked mainly to DC-BJV surfaces. Washing test showed that the release of heparin was (281±43), (422 ± 60), (729±81), (1053±116), (1317±157), (1618±187) and (1945 ± 268 ) μg/cm(2) at 1 day, 1, 2, 3, 4, 6 and 8 week washing, respectively. Tensile tests showed an increased biomechanical stability. Hemocompatibility evaluations showed that PT and APTT of all the trial groups were above the normal reference ranges and that mean platelet count per 10000 μm2 area was 8±4 for HICMs layer-by-layer modified BJV (LBL-BJV) vs 48±16 for DC-BJV. CONCLUSION HICMs are firmly linked to DC-BJV, and can form nanoscale thrombo-resistant films, which yield a sustained release of heparin. HICMs nanomodification improves the hemocompatibility of decellular xenograft.
Animals ; Biocompatible Materials ; Blood Vessel Prosthesis ; Cattle ; Cell-Free System ; Coated Materials, Biocompatible ; chemical synthesis ; chemistry ; pharmacology ; Heparin ; administration & dosage ; chemistry ; Iron ; administration & dosage ; chemistry ; Jugular Veins ; Nanostructures ; chemistry ; ultrastructure ; Surface Properties ; Tissue Scaffolds ; Transplantation, Heterologous

Postoperative epidural adhesion is one of the most common causes of failed back surgery syndrome (FBSS), which can lead to back and leg pain or neurological deficit. Prevention of epidural adhesion after laminectomy is critical for improving the outcomes of lumbar surgery. The main origins of epidural fibrosis are raw surface of erector muscles and rupture fibers of intervertebral disc. The main current preventive methods for epidural adhesion include the usage of implants, chemicals and low dose radiation. However, most of them are still in experiment period. There are still controversies on the clinic usage of autograft free fat, ADCON-L, and Mitomycin C (MMC). The optimal implants are characteristics of better biocompatibility, degradable absorption and capability of existing for a certain period in body. The optimal medicine should have good effect on anti-desmoplasia, less side effects and long half-life. Besides, the combination of biodegradable medical film and drug and the mixture of two or more medical films are also the research frontlines of epidural adhesion. Further researches are required to explore new materials and drugs with stable and most favorable effect in preventing epidural adhesion.
Biocompatible Materials ; administration & dosage ; Epidural Space ; pathology ; Humans ; Laminectomy ; adverse effects ; Lumbar Vertebrae ; surgery ; Tissue Adhesions ; prevention & control

OBJECTIVETo prepare a goat model of tibial bone hole defect suitable for studies of bone defect repair using tissue-engineered injectable bone materials.

METHODSA circular hole bone defect 1.2 cm in diameter was induced below the tibial medial plateau of the goat. X-ray, histological inspection, and image analysis were carried out to evaluate the validity of the model in simulating limb bone defect for the study of tissue-engineered injectable bone materials.

RESULTSAt 4 and 8 weeks after the operation, neither X-ray nor histological examination showed obvious bone tissues in the bone defect. Image analysis showed a area of new bone tissue formation of (8.79 - or + 3.63)% in the total defect area at 4 weeks, which increased to (15.41 - or + 4.21)% at 8 weeks.

CONCLUSIONThe goat model of tibial bone hole defect established in this study is suitable for studying the ability of injectable bone materials for repairing limb bone defect, and offers a simple and reliable means to simulate the local condition of bone regeneration and mechanical environment of bone defect in the limbs.

Animals ; Biocompatible Materials ; administration & dosage ; Bone Regeneration ; Bone Substitutes ; administration & dosage ; Disease Models, Animal ; Female ; Goats ; Injections ; Male ; Tibia ; injuries ; Tibial Fractures ; therapy ; Tissue Engineering

OBJECTIVETo determine the efficacy of polylactic acid glue in preventing epidural scar adhesion after laminectomy in rabbits.

METHODSTwenty-four Japanese white rabbits underwent laminectomy (including the attached ligaments) at L(2 ) and L(5). After laminectomy at L(5), polylactic acid glue was sprayed on the dura and nerve roots and this segment was taken as the experimental group. After laminectomy at L(2), nothing was used and this segment was enrolled as the self control group. Four rabbits were killed every two weeks postoperatively till the end of the experiment at 12 weeks. Then the operated spine was observed grossly, histologically and ultrastructurally to check the degree of scar formation, the status of epidural scar adhesion, the absorption of the glue, and the intracellular structure of fibroblasts.

RESULTSThe glue coagulated immediately after spraying and showed excellent hemostatic effect. The glue membrane was easy to be taken away from the dura mater of the samples for 2 weeks and there were no cells in the epidural space in the experimental group. But the dura mater was covered by hematoma in the control group, which formed mild adhesion, with fibroblasts proliferating actively. In the 4th week, some glue shivers remained in the epidural space with fibroblasts increasing a little, and the dura mater was smooth in the experimental group. However, in the control group, the formed scar was fragile and conglutinated with the dura mater diffusely and fibroblasts were much more than those in the experimental group. In the 6th-12th weeks, there was a potential interspace between the scar and the dura mater, and the polylactic acid glue was absorbed completely in the experimental group. Much tough scar was found in the control group, which was very difficult to dissect from the dura mater and the surrounding tissues. From the ultrastructural observation of the fibroblasts, the nucleus became much bigger and the rough endoplasmic reticulum was much more plentiful in the control group than that in the experimental group.

CONCLUSIONSPolylactic acid glue can effectively reduce epidural cicatrization and adhesion.

Animals ; Biocompatible Materials ; Cicatrix ; prevention & control ; Lactic Acid ; administration & dosage ; pharmacology ; Laminectomy ; Membranes, Artificial ; Polyesters ; Polymers ; administration & dosage ; pharmacology ; Postoperative Complications ; prevention & control ; Rabbits ; Tissue Adhesions ; prevention & control

A biodegradable modified guar gum microsphere was prepared for the first time by ionic gelation of the guar gum derivative containing quarternary ammonium group with tripolyphosphate at room temperature in the absence of emulsifying agent or organic solvent. Its average particle diameter was about 140 microm and the particle size had a narrow and normal gauss distribution. From the loading experiment of bovine serum album (BSA) with various concentrations, it was found that the encapsulation efficiency is more than 80%. By the investigation of in vitro release from the BSA-loaded microsphere, it was found that the BSA had a continuous release for more than 6 hours and the release percentage was affected by the initial concentration of the BSA and temperature.
Biocompatible Materials ; chemistry ; Drug Carriers ; chemistry ; Drug Delivery Systems ; Galactans ; chemistry ; Mannans ; chemistry ; Microspheres ; Plant Gums ; chemistry ; Proteins ; administration & dosage ; Serum Albumin, Bovine ; administration & dosage

Emplacing a stent in the coronary artery has many characteristics. The installation is easy to do and the stent has evident curative effect. However, it will cause thrombosis and immunoreaction because it is metal. So suburgent thrombosis and restenosis after surgeries are still two major complications. The drug-coated stent is one kind of the drug-eluting stents, whose metal surface is coated by some polymer that combines with a sort of effective drug or antibody. It can transport the drug or antibody to the localily of pathological changes and there in it improves the local drug concentration. In this paper the research progress of interrelated issues about the drug-coated stent is reviewed.
Angioplasty, Balloon, Coronary ; instrumentation ; Coated Materials, Biocompatible ; Coronary Restenosis ; prevention & control ; Drug Delivery Systems ; instrumentation ; Humans ; Lactic Acid ; administration & dosage ; Paclitaxel ; administration & dosage ; Pharmaceutical Preparations ; administration & dosage ; Polyesters ; Polymers ; administration & dosage ; Sirolimus ; administration & dosage ; Stents ; adverse effects