Subject(s)
Abdominal Muscles/surgery , Hernia, Inguinal/surgery , Hernia, Ventral/surgery , Age Factors , Aged , Humans , Middle Aged , Surgical Flaps , Surgical Mesh , Suture TechniquesSubject(s)
Face/surgery , Prostheses and Implants , Silicone Elastomers , Surgery, Plastic , Adolescent , Adult , Facial Hemiatrophy/surgery , Female , Humans , In Vitro Techniques , Lipodystrophy/surgery , Male , Middle AgedSubject(s)
Bandages , Wound Healing , Animals , Autoradiography , Granulation Tissue/pathology , RatsABSTRACT
The possibilities of the scanning electron microscopy (SEM) technique were evaluated in the studies of functional properties of dressing materials. It was shown that the use of SEM enables the disclosing of the effect of structural characteristics of the dressing materials on their atraumaticity, the appraisal of the absorption capacity of the dressings, and the exploration of the time course of wound healing under the dressings.
Subject(s)
Bandages , Microscopy, Electron, Scanning/methods , Evaluation Studies as Topic , Wound HealingSubject(s)
Pancreas/pathology , Pancreatic Ducts , Pancreatitis/pathology , Polymers , Animals , Atrophy , Blood Glucose/analysis , Chronic Disease , Constriction , Dogs , Female , Islets of Langerhans/pathology , Male , Pancreatitis/therapySubject(s)
Bronchial Arteries , Hemorrhage/therapy , Lung Diseases/therapy , Embolization, Therapeutic , HumansABSTRACT
The macrokinetics of degradation of polyethylene terephthalate (PET) protheses removed from patients were investigated. Two types of protheses were analysed in dependance on polymer environment: 15 patients were characterized as normal, with post-operation periods of 1-10 years and 7 patients were operated at different times after implantation having a bacterial environment around the implants. The tensile strengths, surface morphology and molecular mass of these samples were compared. The macrokinetics of the PET degradation have been described. The presence of bacteria characterized by acid pH accelerates the loss of tensile strength and molecular mass in the PET corresponding to the mechanism of the polymer matrix destruction. The protheses not subjected to infection have been degraded on the surface. The experimental values of the rate constant may be used for lifetime prediction of the polymer implants in the human body under different conditions.
Subject(s)
Bacterial Infections , Polyethylene Terephthalates , Prostheses and Implants , Biodegradation, Environmental , Evaluation Studies as Topic , Humans , Hydrogen-Ion Concentration , Kinetics , Tensile Strength , Time FactorsABSTRACT
Autoradiography and scanning electron microscopy were-used to assess new Soviet dressing materials in experiments on rats. It was shown that the two-layer nonwoven atraumatic material, caproic gauze, a modified surface active agent and kombutek-11 exert favourable effects on the regenerative processes in the wounds and promote more rapid wound healing as compared with a conventional cotton-gauze bandage. It is advisable to devise dressing materials possessing wound-healing action similar to kombutek-11.
Subject(s)
Bandages , Wound Healing , Animals , Autoradiography , Evaluation Studies as Topic , Microscopy, Electron, Scanning , Rats , USSRSubject(s)
Burns/drug therapy , Collagen/therapeutic use , Hydroxyproline/urine , Adult , Bandages , Burns/metabolism , Collagen/metabolism , Female , Humans , Male , Middle AgedABSTRACT
Experiments were made to examine atraumatic properties of 3 samples of dressing material. A dressing made of cotton wool and gauze served as control. It was shown that atraumatic properties of dressing material can be reliably evaluated by cytological examination of wound prints. Atraumatic properties of dressings are determined by structural features of materials used for the manufacture of dressing.
Subject(s)
Bandages/standards , Skin/injuries , Wounds, Penetrating/therapy , Animals , Male , Rats , Wound HealingSubject(s)
Pancreas/surgery , Pancreatic Ducts/surgery , Animals , Chronic Disease , Cyanoacrylates/therapeutic use , Dogs , Humans , Ligation/methods , Neoprene/therapeutic use , Pancreatectomy/methods , Pancreatic Ducts/drug effects , Pancreatic Neoplasms/surgery , Pancreatitis/surgery , RecurrenceSubject(s)
Cellulose, Oxidized/pharmacology , Cellulose/analogs & derivatives , Hemostatics , Animals , Blood Coagulation/drug effects , Cellulose, Oxidized/therapeutic use , Drug Evaluation, Preclinical , Erythrocytes/drug effects , Humans , In Vitro Techniques , Rats , Surgical Mesh , Thrombosis/drug therapyABSTRACT
The nets of polycaproamide removed from rabbits after implantation for times up to 400 days showed a significant change in mass and in molecular weight. The degradation of polycaproamide filaments takes place both on the surface (change of mass) and in the bulk of the polymer implant (change in the molecular weight). The role of phosphates and the enzymes in the polymer degradation are discussed.
