Tissue vitality monitoring system and method and surgical technique

Tissue vitality is monitored by means of a sensor attached to the tissue. Preferably, the sensor is attached to the tissue at the end of a surgical intervention, for example after anastomosis of the colon. The sensor is attached to the tissue with a sensitive surface facing the tissue, e.g. at a point of anastomosis. The sensor is designed to measure for example (partial) carbondioxide or oxygen pressure of the tissue, or the amount of oxygenated hemoglobin in the tissue. The sensor is incorporated in a sensing device with a wireless transponder circuit to read sensor output data from a wireless transponder circuit. As a result the sensor can subsequently be used to read out information about tissue vitality, even if the sensor itself is located in an inaccessible location, such as the inside of the colon, without physically perturbing the tissueElectrical Engineering, Mathematics and Computer Scienc

The ‘AbdoMAN’: An artificial abdominal wall simulator for biomechanical studies on laparotomy closure techniques

Purpose: Incisional hernia remains a frequent complication after abdominal surgery associated with significant morbidity and high costs. Animal and clinical studies have exhibited some limitations. The purpose of this study was to develop an artificial human abdominal wall (AW) simulator in order to enable investigations on closure modalities. We hypothesized that a physical model of the human AW would give new insight into commonly used suture techniques representing a substantial complement or alternative to clinical and animal studies. Methods: The ‘AbdoMAN’ was developed to simulate human AW biomechanics. The ‘AbdoMAN’ capacities include measurement and regulation of intra-abdominal pressure (IAP), generation of IAP peaks as a result of muscle contraction and measurements of AW strain patterns analyzed with 3D image stereo correlation software. Intact synthetic samples were used to test repeatability. A laparotomy closure was then performed on five samples to analyze strain patterns. Results: The ‘AbdoMAN’ was capable of simulating physiological conditions. AbdoMAN lateral muscles contract at 660 N, leading the IAP to increase up to 74.9 mmHg (range 65.3–88.3). Two strain criteria were used to assess test repeatability. A test with laparotomy closure demonstrated closure testing repeatability. Conclusions: The ‘AbdoMAN’ reveals as a promising enabling tool for investigating AW surgery-related biomechanics and could become an alternative to animal and clinical studies. 3D image correlation analysis should bring new insights on laparotomy closure research. The next step will consist in evaluating different closure modalities on synthetic, porcine and human AW.Industrial Desig