Lubrication coating is widely used to reduce the friction between the interventional devices and the blood vessels, improves the surface biocompatibility of the interventional device, and also brings the coating stability problems and related risks. This paper describes the coating-related content from the equipment description, performance verification, technical requirements, etc., to reduce the risk of the coating to an acceptable level.
Catheters ; Coated Materials, Biocompatible ; Friction ; Lubrication

OBJECTIVETo observe bone ingrowth of artificial femur which three dimensions (3-D) porous Ti combined bone morphogenetic proteins (BMPs) integrating on the prostheses surface in dogs.

METHODSThe prostheses integrated 3-D porous Ti on the surface, which combined BMPs directly or through FG, were implanted canine. And fluorescent labeling was done at 2, 5 weeks after that, and then the prostheses with femurs were taken out in 3, 6 weeks after operation. These specimens were treated, then observed through microscopy.

RESULTSAt 3 weeks, bone growing 1/2 of full thickness in 3-D porous Ti, but bone growing full thickness in 3-D porous Ti at 6 weeks. Bone formation was obviously higher at 6 weeks than at 3 weeks.

CONCLUSIONThe prostheses modified 3-D porous Ti can accelerate osteogenesis and improve bone formation so that mechanical interlock and integration can be come true.

Animals ; Bone Morphogenetic Proteins ; Bone Substitutes ; Coated Materials, Biocompatible ; Dogs ; Female ; Implants, Experimental ; Male ; Porosity ; Titanium

A simple plasma spraying method was employed in coating hydroxyapaptite (HA) on to carbon/carbon composites (C/C composites). The morphology of the coating was examined under scanning electron microscope (SEM). The phase constitutions of the HA coating were determined by X-ray diffractometer (XRD). The shear strength of the HA coating-C/C composite substrates was detected. A hydroxyapatite coating with rough surface was observed. A considerable amount of amorphous phase appeared as a result from the coating process, which could be transformed into the morphous phase crystalline HA after subsequent heat treatment. The shear strength between the HA coating and C/C composite substrates was 7.15 MPa.
Bone Substitutes ; chemistry ; Carbon ; chemistry ; Carbon Compounds, Inorganic ; chemistry ; Coated Materials, Biocompatible ; chemistry ; Durapatite ; pharmacology ; Humans

Hydroxyapatite (HAP) formation on the surface of the degradable polyamides implant by a coating technology was studied. A suspension of HAP-glutin-acetic acid was prepared and brushed on the surface of the implant at room temperature. Scanning electron microscopy (SEM), X-ray diffractometry (XRD) and Fourier transform infrared spectroscopy (FT-IR) were employed to study the composition and the microstructure of the coating. The results obtained indicate that the main composition of coating is crystal HAP, its structural formula is Ca10(PO4)6(OH)2. So the coating has bioactivity. The coating has also small pores, which can stimulate bone regrowth and adsorption of other bioactive materials or mediine. This technology is an effective method to improve medical performance of the polyamides implant.
Bone Substitutes ; Coated Materials, Biocompatible ; chemical synthesis ; chemistry ; Durapatite ; chemical synthesis ; chemistry ; Nylons ; Prostheses and Implants

OBJECTIVETo study the osseointegration of the nanophase hydroxyapatite biograde-coated implants and host bone.

METHODSNanophase hydroxyapatite biograde-coated implants, hydroxyapatite biograde-coated implants and noncoated Ti-6Al-4V implants were inserted into both femoral of Beagle canines the tissue response, dynamic osteogensis and SEM were studied at 4, 8 and 12 weeks.

RESULTSThe degradation of nanophase hydroxyapatite was slower than hydroxyapatite, dynamic osteogensis and the form of osteoblast were better than the control groups.

CONCLUSIONThe biological reaction of Nanophase hydroxyapatite biograde-coated implants is better than hydroxyapatite coated implant.

Animals ; Bone Substitutes ; chemistry ; Coated Materials, Biocompatible ; chemistry ; Dogs ; Durapatite ; chemistry ; Male ; Materials Testing ; Nanoparticles ; Osseointegration ; physiology ; Surface Properties

In an attempt to regain function and aesthetics in the craniofacial region, different biomaterials, including titanium, hydroxyapatite, biodegradable polymers and composites, have been widely used as a result of the loss of craniofacial bone. Although these materials presented favorable success rates, osseointegration and antibacterial properties are often hard to achieve. Although bone-implant interactions are highly dependent on the implant's surface characteristics, infections following traumatic craniofacial injuries are common. As such, poor osseointegration and infections are two of the many causes of implant failure. Further, as increasingly complex dental repairs are attempted, the likelihood of infection in these implants has also been on the rise. For these reasons, the treatment of craniofacial bone defects and dental repairs for long-term success remains a challenge. Various approaches to reduce the rate of infection and improve osseointegration have been investigated. Furthermore, recent and planned tissue engineering developments are aimed at improving the implants' physical and biological properties by improving their surfaces in order to develop craniofacial bone substitutes that will restore, maintain and improve tissue function. In this review, the commonly used biomaterials for craniofacial bone restoration and dental repair, as well as surface modification techniques, antibacterial surfaces and coatings are discussed.
Anti-Infective Agents ; Biocompatible Materials ; Bone Regeneration ; Bone Substitutes ; Coated Materials, Biocompatible ; Dental Implants ; Durapatite ; Esthetics ; Osseointegration ; Polymers ; Tissue Engineering ; Titanium

Carbon/carbon composites have excellent biocompatibility with human hard tissue and elasticity modulus similar with that of human bones, which endow them great potential applications in substitution for human loaded bones. The current research situations and applications of carbon/carbon composites in human loaded bones are reviewed. The coating technologies of bioactive layers on carbon/carbon composites are discussed. The problems to be solved and the prospects of carbon/carbon composites in human loaded bones are analyzed and predicted. It is believed that bioactive layers coating on carbon/carbon composites should play an important role in human loaded bones.
Biocompatible Materials ; chemistry ; Bone Substitutes ; chemistry ; Bone and Bones ; physiology ; Carbon ; chemistry ; Coated Materials, Biocompatible ; chemistry ; Composite Resins ; Durapatite ; chemistry ; Humans ; Stress, Mechanical ; Tensile Strength

This is a report on the research of HA/Ti6Al4V composite implants that were successfully fabricated by radio frequency magnetron sputtering (RF-MS) technique. The mechanism and bioactivity of these implants immersed in simulated body fluid (SBF) were investigated. Changes in surface morphology, interfacial bond state, crystal structure and phase composition of HA coating before and after immersing in SBF were characterized by Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). Results indicate that a new substance on the surface of HA implant coatings produces accompanying with the dissolution of coatings. The substance is bone-like apatite containing CO3(2-) and lacking of Ca2+. Its ratio of n(Ca)/n(P) is about 1.56. This substance has very small grain size and similarly amorphous structure. Its structure and composition are similar to those of natural bone. Thus, it has good biocompatibility and bioactivity.
Biocompatible Materials ; Coated Materials, Biocompatible ; chemical synthesis ; Durapatite ; chemical synthesis ; Magnetics ; Materials Testing ; Prosthesis Implantation ; Radio Waves ; Titanium ; chemistry

OBJECTIVEThe aim of this study was to observe the change of bacterial adhesion on pure titanium coated with nitrogen-diamond like carbon (N-DLC) films and to guide the clinical application.

METHODSN-DLC was deposited on titanium using ion plating machine, TiN film, anodic oxide film and non-deposition were used as control, then made specimens adhering on the surface of resin denture base for 6 months. The adhesion of Saccharomyces albicans on the titanium surface was observed using scanning electron microscope, and the roughness was tested by roughness detector.

RESULTSThe number of Saccharomyces albicans adhering on diamond-like carbon film was significantly less than on the other groups (P < 0.05), and the growth of bacterial cell was inhibited and in a poor state. The largest number of adhesion and cell strains grew well on anodic oxide film group and non-deposition control group. The change of surface roughness of N-DLC film was less than other group (P < 0.05).

CONCLUSIONPure titanium coated with N-DLC film reduced the adhesion of Saccharomyces albicans after clinical application, thereby reduced the risk of denture stomatitis.

Bacterial Adhesion ; Carbon ; Coated Materials, Biocompatible ; Diamond ; Humans ; Nitrogen ; Titanium

The recovery force of Ti-Nb coated and uncoated TiNi shape memory alloy rods was investigated. The rods were 6.0 mm, 6.5 mm and 7.0 mm in diameter respectively. The mean transition temperature was 33.0 degrees C. The rods were stored at -18 degrees C and pre-bent with a three-point bending fixture, the span was 20. 0 centimeters and the deflections were 5.0 mm, 10.0 mm, 15.0 mm and 20.0 mm, respectively. The rods were then heated in a constant temperature saline solution chamber. The experimental temperature was 37.0 C and 50.0 C respectively. The recovery force was measured in a constant displacement mode on biomaterial test machine. The results showed that the recovery force of the memory alloy rod increased with increasing recovery temperature, rod diameter and deformation of both Ti-Nb coated and uncoated surface. The recovery force of Ti-Nb coated rods of 6.0 and 6.5 millimeter in diameter was lower than the uncoated rods in the same diameter. However, the recovery force of 7.0-mm-diameter rods showed no significant difference between coated and uncoated surface.
Alloys ; chemistry ; Biomechanical Phenomena ; Coated Materials, Biocompatible ; Niobium ; Temperature ; Titanium