Coil Group Research Articles

Comparison of safety and effectiveness of medical adhesive and metal spring coil in preoperative localization of peripheral pulmonary nodules

BackgroundAccurate preoperative positioning is the key to the success of thoracoscopic surgery for small pulmonary nodules. There are many methods for locating pulmonary nodules in clinical practice, but there are currently few research reports on the value of medical adhesive localization.ObjectiveTo compare the clinical value of two positioning methods, medical adhesive and metal spring coil, in the preoperative application of VATS through retrospective analysis.MethodsA total of 288 patients who underwent thoracoscopic surgery in our hospital from January 2021 to June 2024 due to the discovery of solitary pulmonary nodules during chest CT examination were included in this study. Preoperative patients were randomly divided into two groups, with 205 patients undergoing preoperative medical adhesive positioning (Group A) and 83 patients undergoing metal spring coil positioning (Group B). After the positioning was completed, record the positioning time of each group of patients and the immediate pain score 15 min after the positioning was completed, the complications located in each group of patients, and whether there was positioning failure or not.ResultsThe localization success rate of the medicine adhesive positioning group [99.5% (204/205)] was higher than that of the metal spring coil positioning group [91.6% (76/83)] (P = 0.001). The positioning time of the medical adhesive positioning group was 12.00 (10.00, 14.00) min, which was shorter than the 13.00 (11.00, 16.00) min of the micro coil group (P = 0.001). The immediate pain score (2.32 ± 0.79) of the medical adhesive positioning group 15 min after positioning was significantly lower than that of the metal spring coil positioning group (3.97 ± 0.54) (P < 0.001). The incidence of complications such as pneumothorax [15.7% (13/83) vs 5.4% (11/205), P = 0.004], pulmonary hemorrhage/hemoptysis [20.5% (17/83) vs 4.9 (10/205), P < 0.001] was significantly higher in the metal coil positioning group than in the medical adhesive positioning group.ConclusionPreoperative medical adhesive positioning for pulmonary nodules is safe, reliable, and effective. Compared with metal spring coil positioning, it has shorter positioning time, milder pain after positioning, lower incidence of positioning related complications, and more flexible arrangement of surgical timing after positioning. It has high clinical application value.

Comparison of Embolization Coils and Patent Ductus Arteriosus Occluders for Coronary Artery Fistula Transcatheter Closure: A Single Centre Experience.

There is no dedicated occlusive device for closing coronary artery fistulas (CAFs), and specific efficacy and safety data of various off-label occlusive devices for CAFs closure are scarce. Patients undergoing transcatheter closure of CAFs from January 2011 to December 2022 were included in the single-center retrospective study. The study population was divided into 2 groups: coils group (n=35) and patent ductus arteriosus (PDA) occluders group (n=66). No significant intergroup differences were observed in demographic characteristics except age. The presence of multiple CAF origins (54.3% vs. 4.5%, p<0.001) and multiple draining sites (51.4% vs. 3.0%, p<0.001) were more common in the coils group. In contrast, the presence of aneurysm (72.7% vs. 14.3%, p<0.001), and large fistula (75.8% vs. 37.1%, p<0.001) were more prevalent in the PDA occluders group. The acute procedural success rate of the PDA occluders group was higher compared to that of the coils group (87.9% vs. 62.9%, adjusted odds ratio [OR], 7.20; 95% confidence interval, 1.59-32.64; p=0.01). In addition, no significant intergroup differences were noted in both the recanalization rate (7.8% vs. 20%, p=0.107) and the reintervention rate (3.1% vs. 8.6%, p=0.342). Transcatheter closure of CAFs using PDA occluders was associated with significantly higher acute procedural success rates compared to coil embolization with comparable late outcomes.

Abstract 380: Proximal coiling versus Liquid Agents in Treatment for Middle Meningeal Artery Embolization: A single center study with 72 patients

Background Various embolic materials, including n‐butyl cyanoacrylate (nBCA), Onyx, and coils, have been used in MMA embolization. The choice of embolic material may influence procedural outcomes, including the extent of MMA branch embolization and the risk of complications. To address this gap, we compared clinical and radiological outcomes for proximal coiling vs liquid agents in the treatment of subdural hematomas (SDHs). Methods A retrospective case‐control study assessed 72 patients with SDH who met inclusion criteria and underwent either proximal coiling (n=10) or liquid embolization (n=62) between 2022 and 2023. Demographic data, clinical presentation, radiological membrane thickness, procedure time, complications, and follow‐up outcomes were recorded. Clinical outcomes were assessed using the modified Rankin Scale (mRS) at admission and at the 90‐day follow‐up. Descriptive statistics for baseline characteristics and outcomes were calculated Univariate and multivariate correlations were investigated using binomial and multinomial logistic regressions with reporting of the odds ratios (ORs). Results Overall cohort had a mean age of 68.1 years, with no significant differences between the coil and liquid groups in age, gender distribution, or comorbidities. Significant differences were observed in preoperative SDH width (p&lt;0.01) and membrane presence (p=0.04) between the two groups. Clinical outcomes at 90‐day follow‐up showed no statistically significant differences in mRS scores between the coil and liquid agent groups. Complications were reported in 4.2% of the total cohort, occurring only in the liquid embolic group, with no complications in the coil group. Retreatment was required in 5.6% of patients, with one case in the coil group and three cases in the liquid group, showing no significant difference (p&gt;0.95). The overall mean mRS score improved significantly from 3.1 at admission to 1.0 at 90 days, with no significant difference in the degree of improvement between the two groups (p=0.50). The mean procedural duration was 40.2 minutes, with the coil group having a slightly longer mean duration (48.3 minutes) compared to the liquid group (39.0 minutes), though this difference was not statistically significant (p=0.07) Conclusion MMA embolization using either coils or liquid embolic agents is an effective and safe treatment for cSDH, with both modalities showing comparable clinical outcomes and procedure times. While the liquid embolic group had a slightly higher rate of complications, this was not statistically significant. Both treatment options resulted in substantial improvements in mRS scores, suggesting their efficacy in reducing the recurrence and managing cSDH. Proximal coiling could be an alternative option, whereas the liquid agents or DMSO compatible are not available for MMA embolization

In Vivo Feasibility of Arterial Embolization with a New Permanent Agar-agar-Based Agent.

Evaluate the safety and efficacy of an eco-friendly permanent agar-agar-based embolization agent (ABEA) (EmboBio®) for intra-arterial use. Six pigs embolized with one ABEA torpedo (6 lower polar renal and 6 lumbar arteries) and one coil (6 lower polar renal and 6 lumbar arteries). Technical success was defined as a complete occlusion with no residual flow in DSA. Short-term endpoints included safety (non-targeted embolization), ease of use (embolization preparation time, occlusion time), and DSA controls at day 7, month 1, and month 3. Tissue reaction was assessed via [18F]-FDG PET/CT at month 2 and histological study at month 3. ABEA torpedoes achieved immediate and persistent occlusion at month 3 for all kidney and lumbar embolizations (n = 12/12). Control coils had technical success for 12/12, with a persistent occlusion at month 3 for 2/12. No off-target embolization occurred. ABEA torpedoes demonstrate faster occlusion (ABEA: 6 ± 4s; coils: 427 ± 469s; p = 0.0022, n = 12) and preparation times (ABEA: 96.9 1 ± 23s; coils: 150.33 ± 58s; p = 0.0432, n = 12) after device placement than coil. No significant difference in inflammation between ABEA and coil groups at month 2 (ABEA: 3.35e-6 ± 1.7e-6%ID/mm3; coils: 2.24e-6 ± 8.5e-7%ID/mm3; p = 0.5) on PET imaging. These results were confirmed by histological analysis at month 3. Permanent dry foam torpedo comprising agar-agar is effective for arterial embolization. In animal model, one ABEA torpedo demonstrates a faster and more persistent occlusion than one fiber coil. Not applicable.

Safety and effectiveness of Neuroform Atlas stent-assisted coil embolization for ruptured intracranial aneurysms.

The treatment outcomes of ruptured intracranial aneurysms using the Neuroform Atlas stent were evaluated. This study represents a retrospective review that included patients who underwent endovascular treatment for ruptured aneurysms at a single institution. Between January 2018 and September 2022, endovascular treatments including simple coiling or Neuroform Atlas stent-assisted coil embolization were performed in 191 patients with ruptured intracranial aneurysms. Intraprocedural rupture was observed in 11 (8.7%) patients in the Simple Coiling (SC) group, which was slightly higher than that in 4 (6.3%) patients in the Neuroform Atlas stent-assisted coiling (NASAC) group (p=0.241). However, Thromboembolic event (TEE) was slightly more prevalent in the NASAC group, with 4 (6.3%) cases as compared to the 5 (3.9%) cases in the SC group (p=0.235). The retreatment rate was slightly higher in the SC group, with 19 (26.4%) patients as compared to the 10 patients (22.2%) in the NASAC group (p=0.342). The use of the Neuroform Atlas stent (NAS) for ruptured aneurysms might be safe and effective.

Transmission Coil Group Shaping for Wireless Magnetic Induction MISO Communication System

Abstract Magnetic induction communication is a technology that utilizes magnetic field variations to transmit information. Compared to traditional electromagnetic wave communication, magnetic induction communication performs excellently in environments where electromagnetic waves are difficult to propagate, such as underwater and in soil. However, the current transmission rate of magnetic induction communication is relatively low. The magnetic induction MISO communication system addresses the issue of low transmission rates in cross-medium communication. However, it overlooks the impact of the transmission coil group arrangement on transmission rates. This paper investigates the effect of the transmission coil group arrangement on communication performance and proposes an arc-shaped magnetic induction MISO communication system. The transmission rate performance is analyzed, and the impact of the angle between the transmitting and receiving coils on the reception rate is studied. An expression for the channel gain increment is provided, along with its variation trend with the angle. When the position of the receiving coil is fixed, the expression yields the maximum increment of the shaped channel gain. Simulation results demonstrate that the data transmission rate of the shaped system is approximately 10% higher than that of the unshaped system.

Misalignment‐tolerant coupling cell of 2‐D modular WPT system for charging area simplified extension

Abstract2‐D modular wireless power transfer (WPT) system needs to have stable output when coil misalignment occurs. In order to improve the misalignment tolerance of the system coupling unit, this article proposes a magnetic coupling structure based on the LCC‐S compensation topology by combining a rectangular coil with two sets of mutually orthogonal solenoidal compensation coils. The rectangular coil is used to receive the vertical magnetic flux, and the two sets of compensating coils are used to receive the magnetic flux in the directions of X‐axis and Y‐axis on the horizontal plane, separately. The receiving side of the 2‐D wireless power transmission array cells cascaded half‐bridge rectifiers to connect each group of coils. This arrangement effectively compensates for the voltage drop of the rectangular coil caused by positional offset in any direction, so that the output voltage of the receiving side remains stable. The article firstly establishes the equivalent circuit model of the proposed design and deduces in detail the relationship equations between the output characteristics of the system and each influence factor. Secondly, the magnetic coupling structure is designed by finite element electromagnetic simulation software, and the total equivalent mutual inductance fluctuation of the proposed design is verified to be within 3.9% over the range of 2‐D transmission array cells. Finally, a 150 W experimental platform is built to verify the misaligment‐tolerant of the proposed design in the range of 2‐D transmission array cells. The experimental results show that the output voltage fluctuation of the proposed design within 4.27% at all directional offsets. Moreover, the stable output performance can be obtained in the case of vertical and rotational misalignment.

Changes in blood biochemistry thrombosis parameters 24 hours after stent-assisted endovascular treatment of intracranial aneurysms.

This study aims to elucidate the early changes in blood biochemistry thrombosis parameters following stent-assisted endovascular treatment of intracranial aneurysms. Consecutive patients with unruptured aneurysms undergoing stent implantation during endovascular treatment were included in this prospective study with approval from the local ethics committee. Blood samples were collected immediately before and 24 h after the procedure for biochemical analysis, including basic thrombosis indicators, bleeding tests, and a complete blood count. The study included 80 patients (60 women, 20 men) with 134 aneurysms. A total of 135 stents (110 flow-diverting, 25 standard) were used. Additionally, intrasaccular coiling was utilized in 28 aneurysms among 27 patients. Following the procedure, there was a significant decrease in activated partial thromboplastin time, fibrinogen, hemoglobin, and platelet levels, and a significant increase in prothrombin time, D-dimer, von Willebrand factor (vWF) activity/antigen ratio, and leukocyte levels in all patients. Correlation analyses revealed significant positive associations between platelet and fibrinogen levels, and a negative association between D-dimer and fibrinogen levels in the coil (-) group. Additionally, there was a significant negative correlation between aneurysm volume and vWF activity/antigen ratio, and procedure duration and thrombocyte count, while a positive association was found between aneurysm number and leukocyte count in the coil (-) group. Analysis of blood chemistry alterations indicates that intravascular thrombosis occurs in the intracranial circulation following stent-assisted endovascular treatment of intracranial aneurysms. This thrombotic process is more pronounced in patients whose aneurysms were left open (i.e. flow-diverting stent alone).

A novel joint-less second-generation high-temperature superconducting toroidal coil: Promise for fabricating compact toroidal magnetic fields

This paper presents a novel joint-less toroidal magnet made of second-generation high-temperature superconducting (2G-HTS) tapes. This approach effectively resolves the closed-loop issue for 2G-HTS magnets and has the potential to provide higher and more stable magnetic fields. Compared with traditional 2G-HTS toroidal magnets, while the current loops of the joint-less magnets have no resistance, a decrease in magnetic field still occurs, especially in coils with insulation. Therefore, this work focuses on the decrease of the magnetic field of this novel magnet using experimental and microanalytical methods. For the first time, it was verified that, by winding two coil groups, insulated and no-insulated, parallel charging does not cause interference between them. Furthermore, the magnetic field area was expanded by finite element analysis, and simulations showed that the magnetic field converged with increasing number of coils. Besides, we found that the decrease of the magnetic field was related to the damage of the tape during slitting and winding, where insulated coils were more susceptible to damage during winding. The damage usually occurred at the starting point of the tape slitting, because the copper layer was separated due to adhesion during the winding of insulated coils, which further caused the superconducting layer to detach, resulting in a decrease in the critical current. From our perspective, benefiting from the high critical field of the 2G-HTS tapes, this novel toroidal coil structure has significant implications for the construction of compact toroidal magnets.

ELECT: prospective, randomized trial comparing microvascular plug versus platinum-fibered microcoils for embolization of aneurysm sac side branches before endovascular aortic aneurysm repair

BackgroundPreemptive selective embolization of aneurysm sac side branches (ASSBs) has been proposed to prevent type II endoleak after endovascular aortic aneurysm repair (EVAR). This study aimed to explore if an embolization strategy using microvascular plugs (MVP) reduces intervention time and radiation dose compared to platinum-fibered microcoils. Furthermore, the effectiveness of the devices in occluding the treated artery was assessed.MethodsSixty patients scheduled for EVAR underwent percutaneous preemptive embolization of ASSBs using MVPs or coils after a 1:1 randomization. Follow-up imaging was performed during aortic stentgraft implantation.ResultsOverall, 170 ASSBs were successfully occluded (83 arteries by MVPs and 87 by coils) and no acute treatment failure occurred. The mean procedure time was significantly lower in the group treated with MVPs (55 ± 4 min) compared to coil occlusion (67 ± 3 min; p = 0.018), which was paralleled by a numerically lower radiation dose (119 Gy/cm2 vs. 140 Gy/cm2; p = 0.45). No difference was found for contrast agent use (34 ml MVP group vs 35 ml coil group; p = 0.87). At follow-up, reopening of lumbar arteries was seen in nine cases (four after coil embolization; five after MVPs).ConclusionBoth microvascular plugs and coils can be effectively used for preemptive embolization of aneurysm sac side branches before EVAR. Use of plugs offers a benefit in terms of intervention time.Trial registrationClinicalTrials.gov Identifier: NCT03842930 Registered 15 February 2019.Graphical

A novel predictor of ischemic complications in the treatment of ruptured middle cerebral artery aneurysms: Neck-branching angle

ObjectiveThe risk factors of procedural cerebral ischemia (CI) in ruptured middle cerebral artery (MCA) aneurysms are unclear. This study proposed the neck-branching angle (NBA), a simple quantitative indicator of the aneurysm neck and branch vessels, and analyzed its usefulness as a predictor of procedural CI in ruptured MCA aneurysms. MethodsWe retrospectively analyzed 128 patients with ruptured saccular MCA aneurysms who underwent surgical or endovascular treatment between January 2014 and June 2021. We defined the NBA as the angle formed by the MCA aneurysm neck and M2 superior or inferior branch vessel line. The superior and inferior NBA were measured on admission via three-dimensional computed tomography angiography on admission. We divided the patients into clipping (106 patients) and coiling (22 patients) groups according to the treatment. Risk factors associated with procedural CI were analyzed in each group. ResultsBoth groups showed that an enlarged superior NBA was a significant risk factor for procedural CI (clipping, P < 0.0005; coiling group, P = 0.007). The receiver operating characteristic curve showed the closed thresholds of the superior NBA with procedural CI in both groups (clipping group, 128.5°, sensitivity and specificity of 0.667 and 0.848, respectively; coiling group, 130.9°, sensitivity and specificity of 1 and 0.889, respectively). ConclusionThe NBA can estimate the procedural risk of ruptured MCA aneurysms. In addition, an enlarged superior NBA is a risk factor for procedural CI in both clipping and coiling techniques.

Gekko Coil System for Intracranial Aneurysms Treatment in China (GREAT-China): A Prospective Randomized Controlled Open-Label Noninferiority Trial

ObjectivesThis study aimed to evaluate the safety and efficacy of the Gekko coil system in treating intracranial aneurysms (IA) in clinical practice. MethodsA prospective, multicenter, randomized, open-label, parallel positive control, non-inferiority trial conducted by 11 centers in China. Patients with a target IA were randomized 1:1 to coiling with either Gekko or Axium coils. The primary outcome was successful aneurysm occlusion at 6-month postoperative follow-up, whereas the secondary outcomes included the successful occlusion aneurysm rate in the immediate postoperative period, recanalization rate at the six months follow-up, and technical success and security. ResultsBetween May 2018 and September 2020, 256 patients were enrolled and randomized. Per-protocol analysis showed that the successful aneurysm occlusion rate at 6 months was 96.08% for the Gekko coil group compared with 96.12% in the Axium coil group, with a difference of -0.04% (P=0.877). The successful immediate aneurysm occlusion rates were 86.00% and 77.45% in the Gekko coil group and the Axium coil group, respectively, showing no significant difference between the two groups (P =0.116), whereas the recanalization rates during the 6 months follow-up were 2.02% and 1.96% in the Gekko and Axium coil groups, respectively, which was not statistically significant (P =1.000). ConclusionsThis trial demonstrated that the Gekko coil system was non-inferior to the Axium coil system in terms of efficacy and safety for IA embolization. In clinical practice, the Gekko coil system can be considered safe and effective for treating patients with IA.

Preoperative computed tomography-guided localization for pulmonary nodules: a randomized controlled trial of coil and anchored needle localization.

In patients with pulmonary nodules (PNs), computed tomography (CT)-guided localization is commonly performed prior to the resection of these nodules through video-assisted thoracic surgery (VATS). To evaluate the relative clinical efficacy of coil and anchored needle (AN) insertion as approaches to preoperative CT-guided PN localization. This single-center, prospective, open-label, randomized controlled trial (registration number: NCT05183945) enrolled consecutive patients from January 2022 to July 2022, assigning these patients at random to undergo either coil or AN localization prior to VATS. Efficacy and safety outcomes in these two groups were then compared. This study enrolled in total 100 patients with 120 PNs who were assigned at random to the coil (patients = 50; PNs = 60) and AN (patients = 50; PNs = 60) localization groups. The respective technical success rates for coil and AN localization were 98.3% (59/60) and 100% (60/60), with no significant difference between the groups (p = 1.000). The coil group had a significantly longer median duration of localization relative to the AN group (16.0 min vs. 8.0 min, p < 0.001). Similar rates of localization-related pneumothorax (8.3% vs. 5.0%, p = 0.715) and pulmonary hemorrhage (5.0% vs. 13.3%, p = 0.110) were observed in both groups. In addition, the VATS resection procedures achieved 100% technical success rates in both of these localization groups. Both coil- and AN-based localization approaches can be successfully employed to localize PNs prior to VATS resection, with the AN localization procedure requiring less time to complete on average as compared to the coil-based approach.

Efficacy of endovascular embolization versus microsurgical clamping in the treatment of intracranial aneurysms: a meta-analysis.

Intracranial aneurysms (IA) can induce increased intracranial pressure, headache, and the development of nausea and vomiting if not treated in time, and failure to receive timely diagnosis and treatment can lead to disability or death. However, the efficacy and prognostic value of craniotomy and endovascular embolization in patients with IA remains a controversial topic. This meta-analysis systematically evaluated the efficacy of endovascular coiling versus cranial aneurysm clamping on the immediate postoperative outcome and prognosis of patients with IA. PubMed, EMBASE, and the Cochrane Library databases were searched for retrieval of relevant references. Literature was screened according to pre-defined inclusion and exclusion criteria, and data were extracted and assessed for quality. A total of 10 studies, including 2,654 cases, were included in the analysis. Among them, 1,313 cases underwent craniotomy clipping surgery (clip group), and 1,341 cases underwent endovascular coiling (coil group). The quality of the studies in 8 articles evaluated using the Newcastle-Ottawa Scale (NOS) was ≥6. Meta-analysis was conducted using Rev Man 5.3 and Stata 17 software. The results of meta-analysis showed that no significant difference in complete occlusion rate [OR=1.76, 95% CI (0.78, 3.96), P=0.17] when comparing the clip and coil group. Compared to the clip group, the coil group had a better clinical short-term outcome [OR=1.55, 95% CI (1.05, 2.27), P=0.03], but an increased rate of postoperative residual or recurrence [OR=0.40, 95% CI (0.17, 0.91), P=0.03]. In addition, there were no significance differences identified in terms of complications, including the rates of postoperative rebleeding [OR=1.60, 95% CI (0.97, 2.63), P=0.07], ischemic stroke [OR=1.12, 95% CI (0.45, 2.79), P=0.81], and cerebral vasospasm [OR=0.90, 95% CI (0.13, 6.03), P=0.91]. Subsequently, we conducted experimental sequence analysis for each indicator, and the results were consistent with the results of meta-analysis. According to the recent clinical prognosis, a funnel plot was constructed, showing significant asymmetry on both sides, indicating some publication bias. However, the results of Begg's test with P=0.734 and Egger's test with P=0.633 suggest no significant publication bias. In general, endovascular coiling and microsurgical clipping appear to be equally effective in achieving vascular occlusion. Endovascular coiling may be more effective in improving the short-term clinical outcomes for patients. However, this approach may increase the rate of postoperative residual issue or recurrence.

Annular Electromagnetic Generator for Harvesting Ocean Wave Energy

To sustainably power ocean sensors by harvesting ocean wave energy, an annular electromagnetic generator (A-EMG) based on the principle of Faraday electromagnetic induction is proposed in this paper. The specific structure and working principle of the generator are introduced. The distribution of the magnetic field in the coil, the variation in the induced voltage and the influence of the coil parameters on the output were simulated by the COMSOL Multiphysics software version 6.0. At the same time, an experimental platform was built to test the output characteristics of the generator. Through a comparative study of the capacitor’s charging characteristics, the optimal connection mode between the multiple groups of coils of the generator was preliminarily verified. Finally, the six-degree-of-freedom (6-DOF) platform was used to simulate various wave motion parameters, and the feasibility of the generator for supplying power to ocean sensors was verified.

Transarterial Embolization of Simple Pulmonary Arteriovenous Malformations: Long-Term Outcomes of 0.018-Inch Coils versus Vascular Plugs

PurposeTo compare the safety, effectiveness, and persistence rates of 0.018-inch coils with those of Amplatzer vascular plugs (AVPs; Abbott Vascular, Abbott Park, Illinois) for the treatment of pulmonary arteriovenous malformations (PAVMs) in response to a growing concern that 0.018-inch coil embolization would increase the long-term persistence rate. Materials and MethodsThis is a retrospective, single-center study of a database (2002–2020) of 633 PAVM embolizations. Complex PAVMs and those not embolized with 0.018-inch coils or plugs were excluded. PAVM embolization material was classified into 4 groups: (a) 0.018-inch nonfibered coils (NFCs), (b) 0.018-inch fibered coils (FCs), (c) NFCs and FCs, or (d) plugs. Persistence was defined as flow through the PAVM on digital subtraction angiography (DSA) or as <30% diameter reduction of the aneurysmal sac on unenhanced computed tomography (CT). Kaplan–Meier analysis and Cox regression were used to assess PAVM’s persistence-free survival. ResultsA total of 312 PAVM embolizations with NFCs (43 PAVMs), FCs (127 PAVMs), NFCs and FCs (12 PAVMs), or plugs (130 PAVMs) in 109 patients (28% men; mean age = 49 years) were included. All PAVM embolizations were technically successful without any major adverse events. PAVM persistence-free survival rates at 10 years’ follow-up were 40.8% versus 44.7% in the NFC and FC groups (P = .22) and 47.3% versus 81.0% in the 0.018-inch coil (NFC or FC) and plug groups (P < .0001), respectively. There were 0.43 (79/182) and 0.08 (10/130) re-embolization procedures per PAVM in the 0.018-inch coil and plug groups, respectively (P < .001). ConclusionsPAVM embolization with 0.018-inch coils was safe, but persistence rate with PAVM embolization was significantly higher than that with plugs, with no significant differences between FCs and NFCs.

Analysis of the Wireless Power Transfer System Using a Finite Grid of Planar Circular Coils

In this paper was analysed a wireless power transfer system (WPT) with multiple resonators supplying, for example, sensors or LED lighting. Energy is transferred simultaneously using a group of identical planar spiral circular coils acting as transmitters and receivers. These coils were arranged to form transmitting and receiving planes. The receivers were connected to independent power supply circuits of each, e.g., sensor or LED lighting. Higher power reliability and flexibility can be achieved by isolating these circuits. The proposed system was described and discussed. Taking into account the skin effect and mutual couplings, a theoretical analysis was made. A detailed analysis was made at the resonant frequency of the system. The system was modeled using a matrix equation and appropriate formulas. The calculations were verified experimentally for different loads and two distances between transmitters and receivers. The efficiency and receiver power were compared and discussed. The maximum efficiency was about 45% at the small distance between the planes. The maximum efficiency of the WPT system decreased more than two times to less than 20% when the distance between the coils was doubled. The results and discussion of the conducted analysis may provide valuable knowledge when designing this type of system.

The association between umbilical cord coiling index and adverse perinatal outcomes at term pregnancies

Objectives: The umbilical coiling index, calculated by dividing the total coil number to the cord length, is a representative parameter for umbilical cord coiling status. Recent studies have shown that abnormal umbilical coiling index is associated with adverse perinatal outcomes. Here, we aimed to determine this association at term gestation in our population. Methods: A total of 98 singleton, term pregnant women were included in this prospective study. Demographic, obstetric features and perinatal outcomes of the patients were recorded. Patients were grouped according to the umbilical coiling index as hypocoiled, normocoiled and hypercoiled. Recorded parameters were firstly compared between normocoiled (n = 60) and abnormal coiled (n = 38) groups. Then, they were compared between normocoiled, hypocoiled (n = 20) and hypercoiled (n = 18) groups. Significantly different adverse perinatal outcomes were compared between normocoiled and other groups. Results: Abnormal coiled group had an higher incidence of low fifth minutes Apgar scores, meconium-stained amniotic fluid, intrauterine growth restriction and acute fetal distress as compared to normocoiled group. No significant adverse perinatal outcome was detected between hypocoiled and normocoiled groups. Intrauterine growth restriction (p = 0.004), low Apgar scores (p = 0.046) and fetal distress (p = 0.038) and meconium-stained amniotic fluid were found to be more common in hypercoiled group than normocoiled ones. Conclusions: Abnormal umbilical coiling is associated with adverse perinatal outcomes. Hence antenatal measurement of umbilical coiling index could be a useful parameter to determine high-risk pregnancies and can provide close monitoring for fetal well-being.

Superconducting Magnetic Energy Storage for Pulsed Power Magnet Applications

As part of the exploration of energy efficient and versatile power sources for future pulsed field magnets of the National High Magnetic Field Laboratory-Pulsed Field Facility (NHMFL-PFF) at Los Alamos National Laboratory (LANL), the feasibility of superconducting magnetic energy storage (SMES) for pulsed-field magnets and other pulsed power loads is examined. Basic SMES parameters needed to power one of the coil groups of the large 100 T magnet were determined. A circuit topology for the power transfer between the SMES and the magnet was devised, and the basic performance of the topology was simulated to reproduce the pulse shape currently used in the 100 T magnet. The Finite element analysis (FEA) method was used to calculate the magnetic field distribution of several preferred coil configurations for effective SMES design. Magnetic field distribution and the field dependent critical current density of commercial high temperature superconducting (HTS) tapes were used to understand the conductor/cable requirements for the SMES.

Outcome of different endovascular modalities to treat common iliac artery aneurysms, single center study.

Iliac aneurysms occur in 10% of patients with abdominal aortic aneurysms (AAA). There are three different endovascular approaches to their treatment in the context of infrarenal Endovascular Aortic Aneurysm Repair (EVAR): occlusion by coiling the internal iliac, incorporation using an iliac branch device, and delaying repair using a bell bottom limb. We sought to determine outcomes associated with these three strategies in our practice. The study was a combined prospective cohort study with a retrospective arm: prospective patient recruitment was done for 1year from September 2019 and ended by September 2020, and retrospective data was collected from 2017 to 2019. Demographic, procedural, and imaging data was collected. SPSS was used to analyze data as patients were classified by limbs in four groups: iliac branched, bell bottom, coil and cover technique, and standard treated limbs. There were 65 male and 4 female patients included in this study incorporating 137 limbs with a mean age of 78years (SD ± 8years). Two patients died after discharge (at 3 and 21months postoperatively, without hospital admission) and five patients were lost to long-term follow-up. Three patients had operations that deviated from the plan: one was an IBD converted to bell bottom, one was an IBD that was converted to coil and cover, and one was a bell bottom that did not seal. Follow-up revealed late type IB endoleak in three bell bottom limbs and one limb treated with coil and cover. Common iliac occlusion occurred in one IBD, three bell bottom limbs, and two limbs treated with coil/cover technique. There were four additional ischemic events (buttock claudication in three and intestinal ischemia in one): all ischemic events occurred in the coil and cover group (p = .001). Given the small population size examined in this study, there is no statistical difference between treatment groups; however, there was a trend toward bell bottom technique being associated with higher incidence of type IB endoleak. Coil and cover technique was associated with decreased IB endoleak; however, Buttock claudication and intestinal ischemia occurred more significantly in this group. Using IBD may be the best strategy to improve short- and long-term outcomes in patients with iliac aneurysms.