How to choose medical device silicone tubing?

How to choose medical device silicone tubing?

The process of selecting medical-grade silicone hoses is complicated. First, physical properties must be considered, such as specifications and strength hardness, visibility or the need for radiopaque patterns, and excellent design solutions such as kink resistance. In addition, when selecting implantable silicone tubes, the purity of the raw material, organic chemistry and biocompatibility, specification and performance must be considered, as this factor plays a leading role in the characteristics of the product.

1. Physical properties: When selecting silicone hose, especially when the design of medical machinery tends to be small and medium-sized equipment and drug transportation equipment, the key physical properties to consider are specifications. At this stage, the size of the implantable silicone tube is 0.007 x 0.014 feet.

2. Strength: Generally speaking, the strength of Shore A can be increased from 30 degrees to 80 degrees. Tensile strength decreases with increasing strength. It is a key element in evaluating machines such as wound drainage bags, which are subject to very high working pressures when they are removed from the body.

3. Tear compressive strength and tensile elongation of mechanical equipment elements: If there are fine crack marks in the silicone hose, its tear compressive strength will seriously affect its improvement level. This is critical when silicone tubing is likely to touch parts with sharp edges. The amount of stretch is related to the ductility of the hose, which is a physical property that the balloon hose must take into account.

Ultimately, it is important to carefully assess the surface finish quality of the pipeline. In general, low friction on the surface of the silicone hose is very important for specific applications. Although the surface coating can reduce the adhesion of the silicone itself, it is important that the coating meets biocompatibility regulations, especially when there is a high probability of mechanical equipment touching and entering human cells. Although the tube has high biocompatibility, it is still necessary to select the silicone grade and additives according to the application conditions. Depending on the details, high temperature leaching experiments of 176.67°F (176.67°C) silica gel and secondary vulcanizate processing must be considered under some conditions of high evaporation regulations.

For some kinds of medical devices, visibility is very important, such as the transportation of liquid drug media to the body, or machinery and equipment discharged from the body to the outside. Although the silica gel itself is completely transparent, some silica filler is added to improve the hardness, and barium sulfate (BaSO 4) and titanium dioxide (TiO 2) are added to develop the trend, reduce or remove the clarity, which endangers the clinician to check whether the liquid is flowing according to the estimated trajectory.

In conclusion, in some cases, designers expect silicone hoses to be more prominent in the body, such as when using X-ray or fluorescent perspective lenses to correctly guide medical devices across the body. Barium can be added to the silicone hose, which can be seen not only in the subcutaneous tissue, but also in the liquid state to verify the fluidity. In addition, barium additives with a higher proportion can be used to ensure that the pipeline is based on human bones, which can also be seen when assisting surgeons to place hoses in the spine.