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Advancing a smart air cushion system for preventing pressure ulcers using projection Moire for large deformation measurements

机译：先进的智能气垫系统，可使用投影莫尔条纹预防大面积变形，从而预防压疮

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A pressure ulcer is one of the most important concerns for wheelchair bound patients with spinal cord injuries. A pressure ulcer is a localized injury near the buttocks that bear ischial tuberosity oppression over a long period of time. Due to elevated compression to blood vessels, the surrounding tissues suffer from a lack of oxygen and nutrition. The ulcers eventually lead to skin damage followed by tissue necrosis. The current medical strategy is to minimize the occurrence of pressure ulcers by regularly helping patients change their posture. However, these methods do not always work effectively or well. As a solution to fundamentally prevent pressure ulcers, a smart air cushion system was developed to detect and control pressure actively. The air cushion works by automatically adjusting a patient's sitting posture to effectively relieve the buttock pressure. To analyze the correlation between the dynamic pressure profiles of an air cell with a patient's weight, a projection Moire system was adopted to measure the deformation of an air cell and its associated stress distribution. Combining a full-field deformation imaging with air pressure measured within an air cell, the patient's weight and the stress distribution can be simultaneously obtained. By integrating a full-field optical metrology with a time varying pressure sensor output coupled with different active air control algorithms for various designs, we can tailor the ratio of the air cells. Our preliminary data suggests that this newly developed smart air cushion has the potential to selectively reduce localized compression on the tissues at the buttocks. Furthermore, it can take a patient's weight measurement which is an additional benefit such that medical personnel or caretakers can use it to prescribe the correct drug dosage.
机译：对于坐轮椅的脊髓损伤患者来说，压疮是最重要的问题之一。压疮是长期遭受坐骨结节压迫的臀部附近的局部损伤。由于对血管的压力增加，周围的组织缺乏氧气和营养。溃疡最终导致皮肤损伤，随后组织坏死。当前的医疗策略是通过定期帮助患者改变姿势来最大程度地减少压疮的发生。但是，这些方法并不总是有效或有效。作为从根本上预防压疮的解决方案，开发了一种智能气垫系统来主动检测和控制压力。气垫可通过自动调节患者的坐姿来有效缓解臀部压力。为了分析气囊的动态压力分布与患者体重之间的相关性，采用了投影莫尔系统来测量气囊的变形及其相关的应力分布。将全场变形成像与在气室中测得的气压相结合，可以同时获得患者的体重和应力分布。通过将全时域光学计量学与时变压力传感器输出以及针对各种设计的不同主动空气控制算法相结合，我们可以调整气室的比例。我们的初步数据表明，这种新开发的智能气垫具有选择性降低臀部组织上的局部压缩的潜力。此外，它还可以测量患者的体重，这是一个额外的好处，以便医务人员或护理人员可以使用它来规定正确的药物剂量。

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