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pressure sensor

Makoto Sakai, Hideyuki Saito, Kengo Kuriyama, Tomonori Yoshida, Yuji Kumakura, Keigo Hara, Makoto Sohda, Hiroyuki Kuwano, Ken Shirabe
High-resolution manometry (HRM) has significant contribution in the field of esophageal motility disorders recently. The development of HRM has categorized various esophageal motility disorders focusing on patterns of esophageal motor function. Additionally, the Chicago classification criteria are widely used for manometric diagnosis. HRM provides functional imaging of the esophagus. HRM has closely spaced pressure sensors and displays pressure variations as pressure topography plots. In the analysis of HRM according to the Chicago classification, a hierarchical categorization of motility disorders is made after evaluation of the individual swallow patterns...
September 2018: Kyobu Geka. the Japanese Journal of Thoracic Surgery
Michael G Dickinson, Larry A Allen, Nancy A Albert, Thomas Di Salvo, Gregory A Ewald, Amanda R Vest, David J Whellan, Michael R Zile, Michael M Givertz
BACKGROUND: After several neutral telehealth trials, the positive findings and subsequent FDA approval of an implantable pulmonary artery pressure monitor (PAPM) led to renewed interest in remote patient monitoring (RPM). Here we seek to provide contemporary guidance on the appropriate use of RPM technology. FINDINGS: Although early trials of external RPM devices suggested benefit, subsequent multicenter trials failed to demonstrate improved outcomes. Monitoring features of cardiac implantable electronic devices (CIEDs) also did not deliver improved HF outcomes; although, newer multi-sensor algorithms may be better...
October 8, 2018: Journal of Cardiac Failure
A Maskay, D M Hummels, M Pereira da Cunha
Surface acoustic wave resonators (SAWR) have found widespread usage in various modern consumer radiofrequency (RF) communications electronics, such as cellular phones, wireless devices, GPS devices, frequency control, and sensing applications. External mechanical vibrations modify a SAWR relative dimensions and the substrate's elastic properties, which alter the device's acoustic wave propagation velocity, and ultimately causes the SAWR RF response to change. Detecting vibrations is desirable for dynamic strain, or vibration sensing applications...
October 11, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Talita Malini Carletti, Mayara Abreu Pinheiro, Thais Marques Simek Vega Gonçalves, Renata Cunha Matheus Rodrigues Garcia
BACKGROUND: Edentulism can reduces mastication, leading to changes in food pattern, with possible consequences to masticatory muscle thickness. OBJECTIVES: This study verified masticatory function and oral perception in subjects who did not use lower CDs, and whether the insertion of new upper and lower CDs would improve such variables. METHODS: Fifteen edentulous elderly who wore only the upper CD were selected and received new upper and lower CD...
October 11, 2018: Journal of Oral Rehabilitation
Ester Herrmann, A Ecke, S Fichtlscherer, A M Zeiher, B Assmus
BACKGROUND: Patients with advanced heart failure suffer from frequent hospitalizations. Noninvasive hemodynamic telemonitoring for assessment of pulmonary filling pressure has been shown to reduce hospitalizations. In this article, our experience with possible control intervals and the standardization of the follow-up care of hemodynamic telemonitoring is reported. METHODS: A literature search and our own experience in the follow-up care concerning the implantable pulmonary artery pressure sensor for noninvasive hemodynamic telemonitoring in patients with advanced heart failure are presented...
October 10, 2018: Herzschrittmachertherapie & Elektrophysiologie
Felix Liechti, Silke Bauer, Kiran L Dhanjal-Adams, Tamara Emmenegger, Pavel Zehtindjiev, Steffen Hahn
Background: Over the past decade, the miniaturisation of animal borne tags such as geolocators and GPS-transmitters has revolutionized our knowledge of the whereabouts of migratory species. Novel light-weight multi-sensor loggers (1.4 g), which harbour sensors for measuring ambient light intensity, atmospheric pressure, temperature and acceleration, were fixed to two long-distance migrant bird species - eurasian hoopoe ( Upupa epops ) and great reed warbler ( Acrocephalus arundinaceus )...
2018: Movement Ecology
Brian Akhaphong, Amber Lockridge, Seokwon Jo, Ramkumar Mohan, Jacob A Wilcox, Cameron R Wing, Jean F Regal, Emilyn U Alejandro
Maternal hypertension during pregnancy is a major risk factor for intrauterine growth restriction (IUGR), which increases susceptibility to cardiovascular and metabolic disease in adulthood through unclear mechanisms. The aim of this study was to characterize pancreatic beta cell area and function in the fetal rat offspring of reduced uterine perfusion pressure (RUPP) model of gestational hypertension. At embryonic day 19.5, RUPP dams exhibited lower body weight, elevated mean blood pressure, reduced litter size, and higher blood glucose compared to sham-operated controls...
October 10, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
A Coppola, T Montalcini, P Gallotti, L Luzi, A Pujia, A Giustina, C Gazzaruso
BACKGROUND: Several studies suggested that abnormalities in tissue perfusion of external genitalia and vagina can lead to female sexual dysfunctions (FSDs) and can be associated to metabolic and cardiovascular risk factors. However, there are some technical difficulties in assessing these abnormalities. The measurement of oxygen partial pressure is a noninvasive method to measure oxygen partial pressure (pO2 ) at the skin surface to assess tissue perfusion. The aim of this study was to evaluate whether transmucosal oxygen tension (TmPO2 ) can be measured at the mucosal surface of clitoris and whether the measurements are reliable...
October 9, 2018: Endocrine
Chunya Wang, Kailun Xia, Huimin Wang, Xiaoping Liang, Zhe Yin, Yingying Zhang
Flexible and wearable electronics are attracting wide attention due to their potential applications in wearable human health monitoring and care systems. Carbon materials have combined superiorities such as good electrical conductivity, intrinsic and structural flexibility, light weight, high chemical and thermal stability, ease of chemical functionalization, as well as potential mass production, enabling them to be promising candidate materials for flexible and wearable electronics. Consequently, great efforts are devoted to the controlled fabrication of carbon materials with rationally designed structures for applications in next-generation electronics...
October 9, 2018: Advanced Materials
Ida A van Meurs, Gijs Thepass, Arthur A Stuij, Jan Geert Bollemeijer, Hans G Lemij
PURPOSE: To study whether a clinically significant increase in intraocular pressure (IOP) occurs during simulated sleep conditions with the subject's head turned comfortably into a pillow (the simulated sleep position) and the effect of protective glasses on any such IOP rise. METHODS: A specially developed electronic epipalpebral pressure (EPP) sensor was attached to an eyelid of the right eye of all participants: 11 patients with primary open-angle glaucoma and 11 healthy volunteers...
October 8, 2018: Acta Ophthalmologica
Yu Fu, Shuai Zhao, Rong Zhu
OBJECTIVE: This study proposes a novel wearable pulse monitoring system, which can realize the synchronous measurements of pulse wave, skin temperature and pulse wave velocity (PWV). METHODS: A flexible sensor based on thermosensation is used to detect pressure and temperature stimuli simultaneously. Two sensors are integrated to detect pulse transit along two specific points of artery, e.g. Cun and Chi at a wrist, the data of which are subsequently used to figure out the PWV by using a tailor-designed algorithm conducted in a microprocessor...
October 4, 2018: IEEE Transactions on Bio-medical Engineering
Albert Ruiz-Vargas, Reizal Mohd Rosli, Lukasz Wiklendt, John W Arkwright
BACKGROUND: High-resolution impedance manometry (HRIM) catheters are used for esophageal reflux and bolus transit studies. Usually, these catheters have electrodes spaced at 20 mm intervals that are used for measuring electrical impedance between the consecutive electrodes and pressure sensors with 10 mm separation. Electrical impedance is a distributed measurement between the electrodes, unlike the point measurement of pressure sensors. Thus, the electrode separations affect the overall spatiotemporal resolution of the measurement...
October 7, 2018: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
Ji-Hong Chen, Sean P Parsons, Mitra Shokrollahi, Andrew Wan, Alexander D Vincent, Yuhong Yuan, Maham Pervez, Wu Lan Chen, Mai Xue, Kailai K Zhang, Arshia Eshtiaghi, David Armstrong, Premsyl Bercik, Paul Moayyedi, Eric Greenwald, Elyanne M Ratcliffe, Jan D Huizinga
Simultaneous pressure waves (SPWs) in manometry recordings of the human colon have been associated with gas expulsion. Our hypothesis was that the SPW might be a critical component of most colonic motor functions, and hence might act as a biomarker for healthy colon motility. To that end, we performed high-resolution colonic manometry (HRCM), for the first time using an 84-sensor (1 cm spaced) water-perfused catheter, in 17 healthy volunteers. Intraluminal pressure patterns were recorded during baseline, proximal and rectal balloon distention, after a meal and following proximal and rectal luminal bisacodyl administration...
2018: Frontiers in Physiology
Yucheng Sun, Hanpyo Hong, Arnold Adikrishna, Yoon-Jeong Kim, In-Ho Jeon
PURPOSE: The biomechanical characteristics of anatomic radial head prostheses have not been completely investigated. We compared and analyzed the contact kinematic characteristics of the native radial head and radial head prostheses replicating the native head contour, using a real-time flexion simulation model. METHODS: Ten fresh-frozen cadavers were used in this pilot study. A simulating dynamic motion mode from 0° to 130° of elbow flexion was applied. Radiocapitellar contact pressure and area were measured using a real-time digitized pressure sensor...
October 3, 2018: Journal of Hand Surgery
Albert Ruiz-Vargas, Antoni Ivorra, John William Arkwright
Bioimpedance spectroscopy measurements can be used for tissue characterization. These measurements can be performed in soft tissues by direct contact of a non-invasive probe consisting of two or four electrodes. The amount of force applied by users can be quite different, and the measurements can vary as a result. To compensate for this, we have built an electrical impedance probe (diameter 3.2 mm) with fibre optic contact-force and temperature sensors built in it. The different sensors of the probe were tested individually...
October 4, 2018: Scientific Reports
Lonnie G Petersen, Justin S Lawley, Alexander Lilja-Cyron, Johan Cg Petersen, Erin J Howden, Satyam Sarma, William K Cornwell, Rong Zhang, Louis A Whitworth, Michael A Williams, Marianne Juhler, Benjamin D Levine
KEY POINTS: During long-term missions, some astronauts experience structural and functional changes of the eyes and brain which resemble signs/symptoms experienced by patients with intracranial hypertension. Weightlessness prevents the normal cerebral volume and pressure "unloading" associated with upright postures on Earth, which may be part of the cerebral and ocular pathophysiology. By placing the lower body in a negative pressure device (LBNP) that pulls fluid away from cranial compartments, we simulated effects of gravity and significantly lowered pressure within the brain parenchyma and ventricle compartments...
October 4, 2018: Journal of Physiology
Leo Pauzenberger, Philipp R Heuberer, Felix Dyrna, Elifho Obopilwe, Bernhard Kriegleder, Werner Anderl, Augustus D Mazzocca
BACKGROUND: Delamination in rotator cuff tears has been identified as a prognostic factor for negative outcome after repair, with a reported prevalence between 38% and 88%. PURPOSE: To compare biomechanical properties of 3 repair techniques for delaminated rotator cuff tears. STUDY DESIGN: Controlled laboratory study. METHODS: Eighteen fresh-frozen cadaveric shoulders were used to evaluate rotator cuff footprint reconstruction, contact area and pressure, displacement under cyclical loading, and load to failure of 3 double-row repair configurations: double-row suture repair with medial row knots (medially knotted bridge, mkB); knotless double-row repair using suture tapes (knotless bridge, klB); and knotless double-row, double-layer-specific repair (double-layer, DL)...
October 4, 2018: American Journal of Sports Medicine
Keisuke Tomita, Taka-Aki Nakada, Taku Oshima, Takehiko Oami, Tuerxun Aizimu, Shigeto Oda
We evaluated the accuracy and precision of a novel non-invasive monitoring device in comparison with conventional monitoring methods used in intensive care units (ICU). The study device was developed to measure blood pressure, pulse rate, respiratory rate, and oxygen saturation, continuously with a single sensor using the photoplethysmographic technique. Patients who were monitored with arterial pressure lines in the ICU were enrolled. Systolic and diastolic blood pressure, pulse rate, respiratory rate, and arterial oxygen saturation were measured continuously for 30 min at 5-min intervals using the conventional methods and the study device...
October 4, 2018: Journal of Clinical Monitoring and Computing
Sua Kim, Jung Dong Lee, Jeong Bae Park, Seungjin Jang, Jungchae Kim, Sang-Suk Lee
Objective: There is a growing demand for cuffless blood pressure (BP) measurement as an easy alternative to cuff-occlusion-based BP measurement. We assessed the accuracy of a new cuffless, watch-style BP monitor with a magnetoplethysmography (MPG) sensor compared to two standard auscultatory and oscillatory BP monitors. Subjects and Methods: A total of 34 patients with uncontrolled hypertension (systolic BP ≥150 mm Hg or diastolic BP ≥95 mm Hg) were enrolled in the study...
July 2018: Pulse (Basel, Switzerland)
Balasubramanian Esakki, Surendar Ganesan, Silambarasan Mathiyazhagan, Kanagachidambaresan Ramasubramanian, Bhuvaneshwaran Gnanasekaran, Byungrak Son, Su Woo Park, Jae Sung Choi
Unmanned aerial vehicles (UAVs) have gained significant attention in recent times due to their suitability for a wide variety of civil, military, and societal missions. Development of an unmanned amphibious vehicle integrating the features of a multi-rotor UAV and a hovercraft is the focus of the present study. Components and subsystems of the amphibious vehicle are developed with due consideration for aerodynamic, structural, and environmental aspects. Finite element analysis (FEA) on static thrust conditions and skirt pressure are performed to evaluate the strength of the structure...
October 3, 2018: Sensors
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