Secondary Waves Defined. Secondary waves, or S-waves, are seismic waves produced by an earthquake. As one side of a fault slips past the other, the pressure that had been stored is released and travels radially away from the focus of the earthquake.
Non-Absorbable sutures include :- Polypropylene sutures, Nylon (poylamide), Polyester, PVDF, silk and stainless steel sutures. Monofilament and Multifilament Sutures. Sutures can also be divided into two types on the basis of material structure i.e. monofilament sutures and multifilament or braided sutures. Braided sutures provide better knot security whereas monofilament sutures provide better passage through tissues.
Polydioxanone Sutures (PDS)- monofilament suture. Non absorbable sutures are made of materials which are not metabolized by the body, and are used therefore. either on skin wound closure, where the sutures can be removed after a few weeks, or in some inner tissues in. which absorbable sutures are not adequate.