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Sensorized tissue analogues enabled by a 3D-printed conductive organogel

npj Flexible Electronics 2021年第1期5卷 51-58页

作者： Michael R.Crump Sophia L.Bidinger Felippe J.Pavinatto Alex T.Gong Robert M.Sweet devin mackenzie Department of Materials Science&Engineering University of WashingtonSeattleWAUSA Center for Research in Education and Simulation Technologies University of WashingtonSeattleWAUSA Department of Surgery University of WashingtonSeattleWAUSA Department of Mechanical Engineering University of WashingtonSeattleWAUSA

State-of-the-art tissue analogues used in high-fidelity,hands-on medical simulation modules can deliver lifelike appearance and feel but lack the capability to provide quantified,real-time assessment of practitioner *** monolithic fabrication of hybrid printed/textile piezoresistive strain sensors in a realistic Y/V plasty suture training pad is demonstrated.A class of 3D-printable organogels comprised of inexpensive and nonhazardous feedstocks is used as the sensing medium,and conductive composite threads are used as the *** organogels are comprised of a glycol-based deep-eutectic solvent(DES)serving as the ionic conductor and 3-trimethoxysilylmethacrylate-capped fumed silica particles serving as the gelating *** measurements reveal the influence of fumed silica particle capping group on the mixture *** strain sensors demonstrate a maximum strain amplitude of 300%,negligible signal drift,a monotonic sensor response,a low degree of hysteresis,and excellent cyclic *** increased contact resistance of the conductive thread electrodes used in place of wire electrodes do not make a significant impact on sensor *** work showcases the potential of these organogels utilized in sensorized tissue analogues and freestanding strain sensors for widespread applications in medical simulation and education.

关键词： stability analogues conductive

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Kinematic Analysis of Patients before and after Abdominoplasty

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Modern Plastic Surgery 2023年第3期13卷 85-93页

作者： Jack D. Sudduth Jessica L. Marquez mackenzie French Christopher Clinker Justin Webb devin Eddington Paa Ekow Hoyte-Williams Bradford Rockwell Bo Foreman Division of Plastic Surgery Department of General Surgery University of Utah Salt Lake City Utah USA Division of Epidemiology Department of Internal Medicine University of Utah Salt Lake City Utah USA Department of Surgery Kwame Nkrumah University of Science and Technology Kumasi Ghana Department of Physical Therapy and Athletic Training University of Utah Salt Lake City Utah USA

Background: Abdominoplasty has consistently been one of the top cosmetic procedures performed each year with a high patient satisfaction rate. Excision of the excess abdominal skin has been shown to reduce low back pain and improve posture. The effects of the excess skin removal would, theoretically, be demonstrated through changes in gait. This study aimed to measure kinematic differences during gait to obtain objective measures for abdominoplasty. Methods: Subjects were recruited from a large, academic plastic surgery clinic. Patients were included if they were 18 years of age, able to walk without an assistive device or any hindrance by any existing medical condition, and were scheduled for abdominoplasty. Kinematic measurements were taken before and after surgery using a plug-in-gait marker set, cameras, and a treadmill. Pre- and postoperative measurements were compared and a post-hoc power analysis was created. Results: Nine total patients were included in the study. Joint angles before and after surgery demonstrated moderate differences. However, analysis revealed few significant differences for spatiotemporal or kinematic variables. The power analysis demonstrated an inadequate number of patients to detect significance. Conclusions: Despite the literature describing subjective and objective improvements following abdominoplasty, we were unable to validate this. Overall, there were noticeable differences in joint angles pre- and postoperatively, though the study is too underpowered to reach statistical significance. This preliminary data shows that if the study was powered through a larger cohort, then more generalizable conclusions could be drawn.

关键词： Abdominoplasty Gait Kinematics Surgery Plastic Surgery

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