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Tension-free and sutureless hernioplasty by plug and mesh of nonreabsorbable material is one of the most common techniques for inguinal hernia repair. It's a simple and quick procedure with a low cost and allows for a short hospital stay. It shows a low reoccurrence rate, but it can result, in very few cases, in complications strictly related to prosthetic material. The literature describes some cases of plug migration from its proper position, for example, to the scrotum, preperitoneal adipose tissue, and abdominal cavity. We report on a case of sigmoid colon perforation due to a plug of Trabucco hernioplasty performed 2 years previously.

Accurate harmonics estimation has become a key issue in power quality assessment. This paper deals with a discrete Fourier transform (DFT)-based measurement technique, which can be easily employed to accurately determine the harmonic components of a distorted signal, i.e., voltage or current. The proposed method is based on a modulated sliding DFT algorithm, which is unconditionally stable and does not accumulate errors due to finite precision representation, and a variable sampling period technique (VSPT) to achieve a frequency adaptive mechanism. It is worth noting that the VSPT changes the sampling period for a variable grid frequency condition, leading to a constant sampling frequency under steadystate conditions. The proposed method provides: 1) high degree of accuracy; 2) structural/performance robustness; and 3) frequency adaptability. Given the modular nature of the method, it is implemented on a field programmable gate array. Simulations and experimental tests are shown to verify the performance of the proposed method.