Organic Chemicals
William J. Rea, Kalpana D. Patel in Reversibility of Chronic Disease and Hypersensitivity, Volume 4, 2017
Silicone rubber is a macromolecule with an inorganic base. The outstanding properties of silicone rubbers are their heat and weathering stability. Pure silicone rubber is acceptable for sealants in the houses of the chemically sensitive if it is used sparingly. Also, there appears to be less triggering of the clotting mechanism and vessel wall irritation in catheters made of pure silicone rubber. Arthritic and myalgic symptoms have occurred in chemically sensitive patients with silicone implants. Silicone breast implants and other silicone implants have been shown to be toxic to many individuals. They have been shown to create and exacerbate chemical sensitivity and chronic degenerative disease.41 However, some patients have been shown to tolerate cataract eye implants (Figure 5.21).41
A Novel Approach for Finishing Various Implants
S Santhosh Kumar, Somashekhar S. Hiremath in Role of Surface Modification on Bacterial Adhesion of Bio-Implant Materials, 2020
A viscoelastic polymer commonly used in the development of abrasive media acts as a carrier medium and carries abrasive particles. It has viscous and elastic properties that help in distributing the axial and radial force on the abrasive particles with the help of applied extrusion pressure. Some of the commonly used polymer carriers are polyborosiloxane, silicone rubber, silly putty, natural rubber, styrene butadiene rubber, butyl rubber, etc. In the present investigation, silicone rubber is selected as a viscoelastic polymer media (carrier media) because of its unique properties like wide temperature range (–101°C to 316°C), less cost compared to other synthetic rubbers (Aggarwal, 1987), good thermal conductivity, abrasion resistance, chemical stability (Shit and Shah, 2013), high tear strength and elongation, good processability and not sticky to surfaces, which are the basic requirements for abrasive media. Also, it is one of the most widely used in manufacturing components of aerospace, aviation, medical, semiconductor, and automotive industries. The literature shows that silicone rubber is the best suitable abrasive media, and it has compatibility with a wide range of abrasive particles and is also mechanically stable. The selected type of silicone rubber is Bluesil HCR 1940 LA2, and its physical properties are listed in Table 4.8.
Surgical Models of Stroke Induced by Intraluminal Filament Implantation
Yanlin Wang-Fischer in Manual of Stroke Models in Rats, 2008
Silicone elastomers have been employed for many years in the manufacture of medical devices, including device components and tubing. These elastomers are commercially available in two types: millable high-consistency silicone rubber and pumpable liquid silicone rubber. Low-viscosity silicone liquid is 100% polydimethylsiloxanes. It makes liquid silicone rubbers suitable for molding applications. (Silicone rubber can be purchased as Provil-L®, Bayer Dental D-5090, from Leverkusen, Germany, or Dow Corning, Midland, Michigan, or GE Sealant and Adhesives, Huntersville, North Carolina). Monofilament nylon sutures can be purchased from Ethicon, Somerville, New Jersey, or other companies. Here, we describe the method of Koizumi et al.1 and Takano et al. (1997).13
Predictions of Birmingham hip resurfacing implant offset - In vitro and numerical models
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2019
A. Ramos, Marco P. Soares dos Santos, M. Mesnard
The intact hip model was constructed with a bone structure, and the cartilage model was developed using the Room-Temperature-Vulcanization silicone (RTV) technique, consisting in silicone molds produced at room temperature in a vacuum to produce polymeric parts. This is a suitable technique for producing anatomical models (Ramos et al. 2013). In this case we used a non-conventional RTV procedure, producing a hard mold in Uriol® material and the final part in Silicone rubber, obtained at room temperature in a vacuum. A silicone layer was constructed to reproduce the natural cartilage between the femur and the acetabulum (Ramos et al. 2013), considering the same geometry for the femoral head and the iliac bone. Cartilage thickness is important for intact behavior. We considered the same layer thickness as (Ramos et al. 2013) and a Silicone that was similar material to cartilage (Table 1). The model was developed by a CAD system (Solidworks, Dassault Systèmes Corp), after a mold was produced by the CAM technique to cast the rubber part.
Textured Foot Orthotics on Dynamic Stability and Turning Performance in Parkinson’s Disease
Published in Journal of Motor Behavior, 2020
Kelly A. Robb, Stephen D. Perry
The SoleTM ‘thin sport’ orthotic (D609561, Edge Marketing Corp; Calgary, AB, CAN) was used in both FO and FOT conditions. Sole orthotics are a heat-moldable, over-the-counter orthotic. Each orthotic was heated immediately prior to participant wear, which provided the best contoured fit between plantar foot sole and the orthotic. Grooved plates (Gilad Shoham, Medonyx, Inc, Toronto, ON) were custom made to manufacture the desired top cover design and thickness. Silicone rubber (Smooth-Sil 950 Series) was prepared following the manufacturer’s instructions (Smooth-ON, Inc.), poured into the grooved plates, and cured for 24 hrs. Once cured, the silicone top cover was heat molded and glued to the Sole orthotic (Figure 1). Thin socks, with minimal seams, were worn by all participants (76% polyester, 22% olefine, and 2% rubber; ATW3202-014/M/TO2/P10/S04, Athletic Works, Wal-Mart Canada Corp.).
Human Left Heart Model and Investigation of Flow Through Prosthetic Heart Valves
Published in Structural Heart, 2019
H. Satheesh Kumar, Shailendra D. Sharma
Methods: In order to study left heart flow dynamics using optics based visualization methods, main components of the model were made transparent. Pressure pulses were provided by the ViVitro SuperPump to the model, externally, to mimic left heart function. Figure shows the components of left heart model. Aorta and LV base with aortic sinus and left atrium component were 3D printed. LV is hand molded from moldable silicone rubber. These components were assembled and placed in a transparent test chamber. Blood analog fluid made of water, glycerin and NaCl mixture used as test fluid and to match the Refractive Index (RI) of LV model for experiments. Qualitative and quantitative in-vitro experiments are conducted for various valve cases and flow conditions.
Related Knowledge Centers
- Catalysis
- Elastomer
- Oxygen
- Polymer
- Vulcanization
- Silicone
- Silicon
- Carbon
- Hydrogen
- Curing