Smart syringe using actuator and force sensor for epidural anesthesia injection

2021 ◽  
pp. 039139882110665
Author(s):  
Ki-Cheol Yoon ◽  
Kwang Gi Kim ◽  
Dong Chul Lee ◽  
Sang Jin Yoon
Keyword(s):  
Epidural Space ◽  
Performance Test ◽  
Force Sensor ◽  
Needle Insertion ◽  
Intensive Training ◽  
External Monitoring ◽  
Electrical Sensing ◽  
Accurate Treatment ◽  
High Level ◽  
Medical Accident

The anesthesia process in the epidural space is quite difficult as it requires a high level of skill. Therefore, a medical accident occurs, and intensive training is required. In order to reduce these medical accidents, medical technology is being developed, which provides safe and accurate treatment services. This paper proposes a smart syringe design for safe and accurate anesthesia in the epidural space. The smart syringe is designed to measure the electrical sensing waveform by using a sensor instead of the sense of the hand during anesthesia and show the position of the needle through external monitoring. To design a smart syringe, a force sensor, actuator, and CPU were used, and a 3D printer was used to produce the outer shape. An animal test was conducted to evaluate the performance test of the smart syringe, and satisfactory results were obtained by measuring the needle insertion process of the smart syringe and the position of the needle through the animal experiment.

CT-Guided Autologous Blood Patch for High-Level Cervical Cerebrospinal Fluid Leakage: Imaging Characteristics and Treatment Safety and Efficiency

2021 ◽  
pp. 1-7
Author(s):  
Xiaofeng He ◽  
Yueyong Xiao ◽  
Xiao Zhang ◽  
Xiaobo Zhang ◽  
Xin Zhang ◽  
...  
Keyword(s):  
Cerebrospinal Fluid ◽  
Epidural Space ◽  
Autologous Blood ◽  
Cerebrospinal Fluid Leakage ◽  
Imaging Features ◽  
Ct Guided ◽  
Iodinated Contrast ◽  
Blood Patch ◽  
Csf Leakage ◽  
High Level

<b><i>Introduction:</i></b> Epidural blood patches (EBPs) are rarely performed at the high-level cervical levels. The aim of the study was to investigate the imaging features, safety, and effectiveness of CT-guided percutaneous EBPs for high-level cervical cerebrospinal fluid (CSF) leakage. <b><i>Methods:</i></b> Twenty-five patients with spontaneous high-level (C1–C3) CSF leakage on MRI and CT imaging, including 2 patients with intracranial epidural hematoma caused by CSF, were treated with EBP. Two needles were inserted into the C1–3 bilateral epidural space. The needle location was confirmed by injection of both 3–5mL sterile air and a diluted iodinated contrast agent to delineate its spatial diffusion. The patient’s blood 11.1 ± 3.1 mL was slowly injected to make a patch; the distribution in epidural space was monitored with intermittent CT scanning. <b><i>Results:</i></b> The typical manifestation of CSF leakage was the high signal outside the C1–3 cervical dura on MR T2W fat inhibition images and low density in cervical muscle space on CT images. Twenty patients suffered from headaches and were able to sit and walk 24 h after the operation. Four patients, with partial relief of headache and a small but persistent CSF leakage, were re-treated with EBS. One patient underwent a third operation because of a persistent CSF leakage on MRI. <b><i>Conclusions:</i></b> Imaging of water at the surrounding epidural space of high cervical level is a typical feature of dural rupture on both MRI and CT. CT-guided EBP is safe and efficient for the high-level cervical CSF leakage, especially for cases in which conservative treatments failed.

The Use of Contract Adjustments to Lengthen the CEO Horizon in the Presence of Internal and External Monitoring

2013 ◽  
Vol 25 (1) ◽  
pp. 199-229 ◽  
Author(s):  
Shane S. Dikolli ◽  
Susan L. Kulp ◽  
Karen L. Sedatole
Keyword(s):  
Boards Of Directors ◽  
Data Availability ◽  
Shareholder Rights ◽  
Compensation Contracts ◽  
Job Change ◽  
External Monitoring ◽  
Increased Risk ◽  
Short Horizon ◽  
High Level ◽  
A Current

ABSTRACT We investigate whether boards of directors adjust compensation contracts to lengthen a CEO's decision horizon, and if the use of such contract adjustments depends on the levels of external (i.e., shareholder-based) and internal (i.e., board-based) CEO monitoring. Based on insights from the career-concerns literature, we identify short-horizon CEOs as those nearing retirement, at a firm with a current earnings decline or loss, and/or with an impending job change. We find that firms with a CEO identified as having a short-horizon place greater contract weight on forward-looking information. This horizon-lengthening contract adjustment is less pronounced when there is greater external monitoring (i.e., as proxied by a high level of shareholder rights), consistent with the intuition that increased shareholder rights mitigate CEO entrenchment, leading to less myopic decision making, independent of a contract adjustment. However, we also find that the horizon-lengthening contract adjustment is more pronounced when there is greater internal monitoring (i.e., as proxied by characteristics of the board), consistent with the intuition that increased employment risk from more intense internal monitoring itself creates a demand for increased incentive weights as a means of compensating the CEO for the increased risk. Data Availability: Data used for this study are derived from publicly available databases and proxy statements. JEL Classifications: M52; M41; J33.

scholarly journals Force-Sensor-Based Estimation of Needle Tip Deflection in Brachytherapy

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Thomas Lehmann ◽  
Mahdi Tavakoli ◽  
Nawaid Usmani ◽  
Ronald Sloboda
Keyword(s):  
Force Sensor ◽  
Needle Insertion ◽  
Interstitial Brachytherapy ◽  
Control Technique ◽  
Torque Sensor ◽  
Treatment Efficiency ◽  
Treatment Procedure ◽  
Virtual Sensor ◽  
Needle Deflection ◽  
Mechanical Models

A virtual sensor is developed for the online estimation of needle tip deflection during permanent interstitial brachytherapy needle insertion. Permanent interstitial brachytherapy is an effective, minimally invasive, and patient friendly cancer treatment procedure. The deflection of the needles used in the procedure, however, undermines the treatment efficiency and, therefore, needs to be minimized. Any feedback control technique to minimize the needle deflection will require feedback of this quantity, which is not easy to provide. The proposed virtual sensor for needle deflection incorporates a force/torque sensor, mounted at the base of the needle that always remains outside the patient. The measured forces/torques are used by a mathematical model, developed based on mechanical needle properties. The resulting estimation of tip deflection in real time during needle insertion is the main contribution of this paper. The proposed approach solely relies on the measured forces and torques without a need for any other invasive/noninvasive sensing devices. A few mechanical models have been introduced previously regarding the way the forces are composed along the needle during insertion; we will compare our model to those approaches in terms of accuracy. In order to conduct experiments to verify the deflection model, a custom-built, 2-DOF robotic system for needle insertion is developed and discussed. This system is a prototype of an intelligent, hand-held surgical assistant tool that incorporates the virtual sensor proposed in this paper.

Development of a Novel Micro-Gripper Integrating Tri-Axial Force Sensor

2007 ◽  
Author(s):  
Jiachou Wang ◽  
Weibin Rong ◽  
Lining Sun ◽  
Hui Xie ◽  
Wei Chen
Keyword(s):  
Axial Force ◽  
Crystalline Silicon ◽  
Force Sensor ◽  
Calibration Method ◽  
Deep Reactive Ion Etching ◽  
Micro Gripper ◽  
The Cross ◽  
Silicon Frame ◽  
High Level ◽  
Cross Structure

A novel micro gripper integrating tri-axial force sensor and two grades displacement amplifier is presented in this paper, which bases on the technology of Piezoresistive detection and use PZT as its micro driving component. The micro tri-axial force sensor is fabricated on a single-crystalline-silicon by the technology of MEMS and consists of a flexible cross-structure realized by deep reactive ion etching (DRIE). The arms of the cross-structure are connected to a silicon frame and to the central part of the cross-structure. After modeling the amplifier structure of micro gripper and the sensor, finite element method (FEM) is used to analyze the displacement of the micro gripper and the deformation of the cross-structure elastic cantilever. A calibration method of tri-axial sensor based on the technology of microscopic vision and the principle of bending deflection cantilever is proposed. The experimental verified that the sensor are high level of intrinsic decoupling of the signals from strain gauge, high resolutions in all three axes, high linearity and repeatability and simple produce of calculation. And also show the micro gripper is reasonable and practical. The sensor is capable of resolving forces up to 10mN with resolution of 2.4μN in x axis and y axis and up to 10mN with resolution of 4.2μN in z axis; the gripping displacement of the micro gripper is from 20μm to 300μm.

scholarly journals Influence of Heat Reflective Coating on the Cooling and Pavement Performance of Large Void Asphalt Pavement

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1065
Author(s):  
Nanxiang Zheng ◽  
Junan Lei ◽  
Shoubin Wang ◽  
Zhifeng Li ◽  
Xiaobao Chen
Keyword(s):  
Titanium Dioxide ◽  
Water Permeability ◽  
Performance Test ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Cooling Effect ◽  
Large Void ◽  
Reflective Coating ◽  
Water Permeability Coefficient ◽  
High Level

To reduce the temperature of asphalt pavement in summer, and alleviate the urban heat island effect, a comprehensive method of combining a heat reflective coating and large void asphalt pavement was proposed. Using the developed coating cooling test equipment, the cooling effect of the coating on a large void asphalt mixture was studied in six different proportions, four different colors, and four different dosages, and the durability of the coating was verified by abrasion tests. Finally, the best dosage of the coating was recommended through an adhesion test of the coating, and a water permeability and anti-skid performance test of the pavement. The results show that the reflectivity of the coating can be improved by adding functional fillers, of titanium dioxide and floating beads, into the coating. The order by reflectivity and cooling effect of the four color coatings was green > red > gray > blue, and the maximum cooling value of the green coating reached 9.7 ℃. The cooling performance of the coating decreased with the increase of wear time, and the rate of decrease was fast, then slow, and finally tended to be stable after 20,000 times wear. The coating reduced the anti-skid performance and the water permeability coefficient of large void asphalt pavement, but still maintained a high level. The green coating with 15% titanium dioxide and 10% floating beads is recommended as the cooling coating for large void asphalt pavement, and its dosage should be controlled at about 0.4–0.8 kg/m2.

Dietary Intake, Body Composition, and Nutrition Knowledge of Irish Dancers

2020 ◽  
Vol 24 (3) ◽  
pp. 105-112
Author(s):  
Jasmine Challis ◽  
Roisin Cahalan ◽  
Phil Jakeman ◽  
Orfhlaith Nibhriain ◽  
Linda Cronin ◽  
...  
Keyword(s):  
Body Composition ◽  
Dietary Intake ◽  
Nutrition Knowledge ◽  
Sport Nutrition ◽  
Full Time ◽  
Dietary Intakes ◽  
Intensive Training ◽  
Knowledge Questionnaire ◽  
Food Diaries ◽  
High Level

Irish dance requires lengthy, intensive training to perform at a high level in competitions and professionally. Irish dancers have been known to have high injury rates. Appropriate nutrient and fluid intakes have been shown to minimize the risk of fatigue and injury during training and performance in sport, but there is a lack of evidence as to whether and how this might apply in Irish dance. Forty adult Irish dancers, 35 females (age 21 ± 3 years) and five males (aged 27 ± 8 years), professionals or in full time training, were recruited for this study to investigate nutrition knowledge, dietary intake, and body composition. Participants were asked to complete "The Sport Nutrition Questionnaire," a sport- and dance-specific nutrition knowledge questionnaire, 4 day estimated food diaries, and under-take a dual x-ray absorptiometry (DXA) scan to assess body composition. Food diaries were analyzed using Dietplan 7. Reported energy, fiber, iron (females), magnesium (females), selenium, iodine (females), and folate (females) intakes were below United Kingdom dietary reference values. Fruit and vegetable intakes were low: 2.7 ± 1.4 portions per day. Sixteen percent of days reported contained no fruits or vegetables. Mean body mass index (BMI) for 35 female participants was 23.2 ± 3.3 kg/m2, mean BMI for five male participants was 22.2 ± 1.6 kg/m2. Mean body fat measured by DXA in 18 female participants was 33.4% ± 6.9%, which was higher than seen in other dance populations. Mean lean mass was 40.8 ± 5.6 kg. Mean score for the nutrition knowledge questionnaire in which the maximum score is 65, was 30.5 ± 7.6 (47% ± 11.7%), range: 9 to 44 (14% to 68%). The ability of the Irish dancers to correctly identify foods as being high or low in carbohydrate, protein, and fat varied widely. Body composition did not correlate with intake of any nutrient but did correlate with nutrition knowledge questionnaire score (r = -.663, p < 0.001). Given the dietary intakes and nutrition knowledge exhibited by the dancers in this study, further work is needed to inform and improve diets and support the demands of Irish dance.

Optical fiber guided needle insertion to localize epidural space in porcine

2010 ◽  
Author(s):  
Yin Chang ◽  
Chien Kun Ting ◽  
Mei-Yung Tsou ◽  
Pin-Tarng Chen ◽  
Kwok-Hon Chan
Keyword(s):  
Optical Fiber ◽  
Epidural Space ◽  
Needle Insertion

scholarly journals Sources of variability of growth and body development traits of Simmental bulls in performance test

2015 ◽  
Vol 31 (3) ◽  
pp. 339-348
Author(s):  
M. Lazarevic ◽  
D. Niksic ◽  
V. Pantelic ◽  
N. Stanisic ◽  
N. Delic ◽  
...  
Keyword(s):  
Body Mass ◽  
Performance Test ◽  
Growth Traits ◽  
Statistical Significance ◽  
Average Daily Gain ◽  
Analysis Data ◽  
The Body ◽  
Body Development ◽  
High Level ◽  
Daily Gain

To test the variability of traits of Simmental bulls in performance test, data of the Livestock - Veterinary Centres for Reproduction and Artificial Insemination of Velika Plana and Krnjaca were used. In the analysis, data on 113 performance tested bulls born from 2008 to 2009 were used. The analysis included two sets of characteristics: body development traits and growth traits. The average body mass of calves entering the test was 195.75 kg, while the body mass at the end of the test was 476.50 kg, average daily gain in the test was 1138.69 g. Average values of body development traits measured at the end of the test, with 12 months of age were: height at withers 127.13 cm, chest circumference 179.42 cm, the chest depth 61.19 cm and body length 151.34 cm. The influence of their sires, the year and the Centre on the variability of traits was studied. The effect of age is present at a high level of statistical significance (p<0.01) for all traits that are registered at the end of the test, while the effect of the Centre was present in the variability of body mass at the end of the test, the daily gain in the test and the length of the body. The bulls-sires' influence was demonstrated (p<0.05) on the variability in body mass of calves entering the test.

scholarly journals Real-time measurement of intraocular pressure variation during automatic intravitreal injections: An ex-vivo experimental study using porcine eyes

PLoS ONE ◽  
2021 ◽  
Vol 16 (8) ◽  
pp. e0256344
Author(s):  
Ikjong Park ◽  
Han Sang Park ◽  
Hong Kyun Kim ◽  
Wan Kyun Chung ◽  
Keehoon Kim
Keyword(s):  
Intraocular Pressure ◽  
Real Time ◽  
Ex Vivo ◽  
Force Sensor ◽  
Needle Insertion ◽  
Injection Rate ◽  
Insertion Force ◽  
Needle Size ◽  
Iop Elevation ◽  
Injection Rates

Purpose To measure needle insertion force and change in intraocular pressure (IOP) in real-time during intravitreal injection (IVI). The effects of needle size, insertion speed, and injection rate to IOP change were investigated. Methods Needle insertion and fluid injection were performed on 90 porcine eyeballs using an automatic IVI device. The IVI conditions were divided according to needle sizes of 27-gauge (G), 30G, and 33G; insertion speeds of 1, 2, and 5 mm/s; and injection rates of 0.01, 0.02, and 0.05 mL/s. Insertion force and IOP were measured in real-time using a force sensor and a pressure transducer. Results The peak IOP was observed when the needle penetrated the sclera; the average IOP elevation was 96.3, 67.1, and 59.4 mmHg for 27G, 30G, and 33G needles, respectively. An increase in insertion speed caused IOP elevation at the moment of penetration, but this effect was reduced as needle size decreased: 109.8–85.9 mmHg in 27G for 5–1 mm/s (p = 0.0149) and 61.8–60.7 mmHg in 33G for 5–1 mm/s (p = 0.8979). Injection speed was also related to IOP elevation during the stage of drug injection: 16.65 and 11.78 mmHg for injection rates of 0.05 and 0.01 mL/s (p < 0.001). Conclusion The presented data offers an understanding of IOP changes during each step of IVI. Slow needle insertion can reduce IOP elevation when using a 27G needle. Further, the injection rate must be kept low to avoid IOP elevations during the injection stage.

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