Creep rupture behavior of polypropylene suture material and its applications as a time‐release mechanism

Abstract

The controlled failure of polypropylene (PP) sutures is studied via creep rupture tests. From plots of log time (tB) vs. stress (sigma), linear relationships are generated over the failure times of 1-1000 h. Results show that as a function of stress, the time dependence varies with irradiation dose (15, 20, 25, and 50 Mrad), irradiation atmosphere (air and vacuum), suture diameter (7-0, 6-0, 5-0, and 4-0), and test temperature (26 and 37 degrees C). For a given stress, the time to failure is least for the greatest dose in the presence of air and at the highest temperature. When suture loops are wrapped around a small wire sheave, however, failure occurs in the largest suture as much as two decades sooner than the smallest suture studied. Within the limitations stated herein, they are independent of test method, loop diameter, aging, and humidity. Consequently, after irradiation in vacuum and postirradiation heat treatment, the processed material may be stored at room temperature for at least 1 month. Such materials are advocated when the time release of a dental or medical device is required, for example, in the self-activating cleft palate appliance.

Creep Behavior of Commonly Used Suture Materials in Abdominal Wall Surgery

“…In this experimental study, we chose "creep" as a parameter to describe irreversible elongation of suture material under a constant load and during a strictly defined period of time. Creep testing with regard to light gauge sutures has been reported before [16][17][18][19]. However in literature we could not find any studies in which 1-, 0-, and 2-0 sutures, as commonly used in abdominal wall surgery, have been subjected to creep tests.…”

Analysis of the fracture morphology of polyamide, polyester, polypropylene, and silk sutures before and after implantation in vivo

“…There are many references in the literature to nonabsorbable suture materials including tensile and knot strength,4–9 strength loss in vivo ,2, 10, 11, 12 time‐dependent properties,13–16 knot security,1, 17–22 biocompatibility, and infection,10, 23–26 but no work has been published hitherto regarding the fracture morphology of sutures.…”