When it comes to selecting a textile for your medical device, engineers can find the selection process quite daunting due to the vast array of implantable fabric designs available and the different performance attributes they offer. Below, Aran Biomedical provide a simple overview of knitted textiles.
Knitted implantable textiles are popular as a component in medical devices across multiple therapy areas. Knitted fabrics offer a significant design opportunity, because of the ability to customise, control and secure yarn placement. As a result the mechanical performance of the output fabric can be precisely managed.
Knitted textiles can be produced in a flat, tubular or as three-dimensional structures and in comparison to other textile manufacturing options they offer several advantagess. Woven fabrics can be made flat, tubular and in a few other three-dimensional designs. However, as the fabric is unable to stretch, this limits the potential design options. Braiding is typically limited to tubular designs or shape formed tubular constructs and both woven and braided designs are susceptible to unravelling.
The desirable characteristics of a knit structures include:
- High levels of controlled stretch in different directions
- Extremely versatile design options
- Managed pore structures
- Shape-forming ability to underlying frames or anatomical requirements
- Customisable performance & physical characteristics
- High degree of tissue in-growth
- Less prone to unravelling