Flexible Piezoelectric Array for Cardiovascular MonitoringDuring Cardiac Arrest

项目摘要 在院外心脏骤停的情况下，关键是快速检测适当的心脏起搏器的性能。 通过临床上可接受的脉率和血压（BP）进行心肺复苏（CPR）。然而，在这方面， 对于没有受过急救训练的人来说，检测适当的CPR可能是困难的。目前，标准 非侵入性地测量BP是使用基于袖带的血压计方法。尝试将这些发展成 用于自动和连续测量的可穿戴设备已被证明是困难的，因此研究人员 看看其他方法。然而，这些方法没有满足灵活性、准确性和低成本的标准。 功耗.本项目旨在开发一种灵活的贴片，用于准确检测脉搏率和血液 通过桡动脉、肱动脉、颈动脉和/或股动脉的表面压力。压电聚合物， 具有固有的灵活性，并已用于压力传感的许多应用中，提供了巨大的使用潜力 作为一种贴片式传感器，用于监测心血管功能。然而，在标准形式中，材料是 不足以准确检测血压。在我们的实验室里，我们开发了一种核-壳结构的聚合物， 结构的导电和压电纳米纤维。核-壳纳米结构显示出4.5 当与标准压电纳米纤维相比时，压力灵敏度提高10倍， 与压电聚合物薄膜相比，这种压力灵敏度的提高 应该允许由这些材料组成的可穿戴设备超过必要的35 dB信噪比 准确检测脉搏波速度所需的比率，脉搏波速度是用于确定 血压.再加上我们实验室开发的导电聚合物的喷墨印刷图案化技术， 我们提出了一种新型的可穿戴贴片形式的核-壳结构压电阵列， 心血管监测为了测试这种压电阵列，并开发数据驱动算法， 检测血压，测试将在可控模拟心血管系统上进行， 复制人类的舒张压和收缩压、脉搏率和动脉机械特性。的 模拟系统可达到的血压福尔斯AAMI标准准确度基准范围内， 无创血压监测精度为5 ± 8 mmHg。我们将训练各种回归模型 使用从该系统产生的数据将检测到的脉搏波速度与血压相关联， 将结果与常用的相关方程进行比较。我们建议制造方法 我们将开发，当与数据驱动的算法结合在一起时，将允许开发低- 电源，柔性贴片，能够检测脉搏率和血压，提供适当的反馈， 心肺复苏

Project Summary In situations of out of hospital cardiac arrest, it is critical to quickly detect the performance of adequate cardiopulmonary resuscitation (CPR) through clinically acceptable pulse rate and blood pressure (BP). However, the detection of adequate CPR can be difficult for someone not trained in first aid. Currently the standard for measuring BP noninvasively is using cuff-based oscillometeric approaches. Attempts at developing these into wearable devices for automated and continuous measurements have proven difficult and so researchers have looked at other methods. However, these methods have not met the criteria for flexibility, accuracy, and low power consumption. This project aims to develop a flexible patch for accurate detection of pulse rate and blood pressure superficially through the radial, brachial, carotid, and/or femoral arteries. Piezoelectric polymers, are inherently flexible and have been used in many applications for pressure sensing, offering great potential for use as a patch-like sensor for monitoring of cardiovascular function. However, in the standard form, the material is not sensitive enough to accurately detect blood pressure. In our lab we have developed a core-shell nanofiber structure of conductive and piezoelectric nanofibers, respectively. The core-shell nanostructure shows a 4.5 times improvement in pressure sensitivity when compared to standard piezoelectric nanofibers and a nearly 40 times improvement when compared to piezoelectric polymer thin films. This improvement in pressure sensitivity should allow for a wearable device composed of these materials to exceed the necessary 35 dB signal to noise ratio required for the accurate detection of pulse wave velocity, a cardiovascular parameter used to determine blood pressure. Coupled with inkjet printing patterning techniques of conductive polymers developed in our lab, we propose to fabricate a novel core-shell nanofiber piezoelectric array in a wearable patch form for cardiovascular monitoring. In order to test this piezoelectric array and develop data-driven algorithms for the detection of blood pressure, testing will occur on a controllable simulated cardiovascular system capable of replicating a human’s diastolic and systolic blood pressures, pulse rates, and arterial mechanical properties. The blood pressure attainable by the simulated system falls within the AAMI standard benchmark for accuracy and precision for noninvasive blood pressure monitoring of 5 ± 8 mmHg. We will train various regression models using the data generated from this system to relate the detected pulse wave velocities to blood pressure and we will compare the outcomes to commonly used correlation equations. We propose that the fabrication methods we will develop, when coupled together with data-driven algorithms, will allow for the development of a low- power, flexible patch, capable of detecting pulse rate and blood pressure, giving feedback on the adequacy of CPR.