Knot strength

Suture Test Throws Total tests Slipped completely Slipped partially 

6 Effect of partial slippage on knot breaking strength of MersMene (M) and silk (S) sutures (a) dry straight tests and (b) saline loop tests. 

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Knitted tapes, sacks, and High knotting strength 1 6.5 PP... 

Diameters are measured using a dead-weight gauge with a specific foot pressure of weight applied with diameters measured to within 0.02 mm. The diameter is measured at three points on the suture, about V4,, and V4 of the strand length. Since the knot strength is so important. 

Diameter (mm) Linear Strength (Kpsi) Knot Strength (N) Modulus (Kpsi) Elongation (%) At37 C at 6 Weeks AtStPC at 4 Weeks... 

Knot strength = 47 Kpsi. Knot Strength = 56 Kpsi. 

BS 1932. Part 2. 1989. knot strength ratio is defined as the ratio of the knot breaking strength (as measured in BS 1932. Part 2) to the yarn breaking strength (as measured in accordance with ISO 2062). 

Although the most remarkable change by acetalization is the increase in hot-water resistance, the mechanical properties of fibers are also affected. Acetalization has practically no effect on fiber tenacity, but formalization induces brittleness in fibers. For example, a heat-treated fiber shows 70-80% relative knot strength, which drops by formalization to 55-65%. There is a rather large difference of resilience between the formalized and unformalized fibers, as shown in Figure 4.20 [114]. It can be seen that the resilience of the unformalized PVA fibers is rather high, but it drops markedly with an initial formalization of less than 20% the drop in fiber resilience after further formalization is very small. 

FIGURE 4.30 Tensile, knot strength, and elongation versus draw ratio of polyvinyl chloride fiber. 

There are many significant mechanical-physical properties, e.g. tensile strength, elongation at break point, tensile modulus, elastic recovery, tension-relaxation/creep under static and dynamic loading, specific weight, shrinkage, moisture absorption and knot strength. 

The tensile and knot strength measurements of all sutures were carried out using an Instron 4301 Tensile Tester before implantation. Prior to tests, all sutures were conditioned in standard atmosphere conditions (20 and 65% relative moisture) for 24 hours. 

In the knot strength tests, a single and sinqile knot (see Fig. 2) was tied in die middle of the sutures mechanically on the Instron Tensile Tester by q lying 10 N tensions. 

Figure 7. The opened knot of polyamide suture (3/0 USP) after knot strength test...

Other properties such as fatigue, knot strength and abrasion resistance are based on a combination of the various anisotropic mechanical and thermal properties. Their relation to the fiber morphology is rather complicated and is still not well understood. 

Knot tenacity (knot strength) n. The strength of a yam specimen containing an overhand knot to measure, by comparison with the strength of the unknotted yarn, its sensitivity to compression or shearing. Kadolph SJJ, Langford AL (2001) Textiles. Pearson Education, New York. 

Abstract The chapter describes procedures and materials used and results obtained from several important studies of the mechanical performance of surgical sutures and the chnical factors that influence their behavior. Key features of successful suture assembly are the material used, structure of the thread, surface treatment, knot strength, and security, the in vivo environment and compatibihty of the tensile properties of the thread with those of the tissues approximated during and after surgery. To improve suture success in terms, particularly, of knot performance, couphng of thermal and chemical energies in conjunction with mechanical interlacing have been experimented with. 

Key words knot security, knot strength, shppage, knot factors, role of friction, secure knot model, behavior in dynamic tests, knot and adhesive, knot and laser. 

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