http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Jae Yun Kim,Soo Nyoung Kim,Chulmin Park,Ho Young Lim,Jae Hun Kim 대한통증학회 2019 The Korean Journal of Pain Vol.32 No.1
Background: Lumbosacral transforaminal epidural injection (TFEI) is an effective treatment for spinal disease. However, TFEI may have several types of complications, some of which can be attributed to intravascular injection. We reviewed studies to compare the intravascular injection rate among different needle types. Methods: We searched the literature for articles on the intravascular injection rate among different needle types used in TFEI. The search was performed using PubMed, MEDLINE, the Cochrane Library, EMBASE, and Web of Science. Results: A total of six studies comprising 2359 patients were identified. Compared with the Quincke needle, the Whitacre needle reduced the intravascular injection rate (OR = 0.57, 95% CI = [0.44–0.73], P < 0.001). However, compared with the Quincke needle, the Chiba needle did not reduce the intravascular injection rate (OR = 0.80, 95% CI = [0.44–1.45], P = 0.46). In one study, the intravascular injection rate using a blunt-tip needle was lower than that using a sharp needle. In another study, the Whitacre and the blunt-tip needle have similar intravascular injection rates, while, the catheter-extension needle showed a reduced intravascular injection rate. Conclusions: This meta-analysis showed that the Whitacre needle reduced the intravascular injection rate as compared with the Quincke needle, but failed to establish that the Chiba needle can decrease the intravascular injection rate in TFEI. Moreover, the blunt-tip needle can reduce the intravascular injection rate compared with the Quincke needle, and the catheter-extension needle can reduce the intravascular injection rate compared with the Whitacre and the blunt-tip needle.
Jang Jae Lee,Si Jun Kim,Young Seok Lee,Chul Hee Cho,Min Su Choi,In Ho Seong,Sang Ho Lee,Won Nyoung Jeong,Shin Jae You 한국진공학회(ASCT) 2020 Applied Science and Convergence Technology Vol.29 No.6
In this study, we experimentally investigated the discharge characteristics of argon and helium dielectric barrier discharges with coplanar electrodes at intermediate pressure to reduce the radar cross section for plasma-based stealth applications. The discharge patterns of argon and helium were investigated according to the pressure, driving frequency, and gas ratio with a fixed input voltage, and the discharge voltages and currents were measured. The power dissipated by the device in one cycle was calculated using the measured values. From the discharge pattern and measured values, we confirmed that a bright glow discharge occurred at a few Torr of argon and tens of Torr of helium, and the discharge was brighter and more uniform in the driving frequency range 5–6 kHz. When a mixture of the two gases was used at tens of Torr, the brightness of the discharge pattern and the number of current pulses increased with the proportion of helium, while the intensity of the current pulses decreased. We confirmed that an efficient and stable discharge can be generated at frequencies 5–6 kHz using several Torr of argon or tens of Torr of helium.
Kim, Jae Yun,Kim, Soo Nyoung,Park, Chulmin,Lim, Ho Young,Kim, Jae Hun The Korean Pain Society 2019 The Korean Journal of Pain Vol.32 No.1
Background: Lumbosacral transforaminal epidural injection (TFEI) is an effective treatment for spinal disease. However, TFEI may have several types of complications, some of which can be attributed to intravascular injection. We reviewed studies to compare the intravascular injection rate among different needle types. Methods: We searched the literature for articles on the intravascular injection rate among different needle types used in TFEI. The search was performed using PubMed, MEDLINE, the Cochrane Library, EMBASE, and Web of Science. Results: A total of six studies comprising 2359 patients were identified. Compared with the Quincke needle, the Whitacre needle reduced the intravascular injection rate (OR = 0.57, 95% CI = [0.44-0.73], P < 0.001). However, compared with the Quincke needle, the Chiba needle did not reduce the intravascular injection rate (OR = 0.80, 95% CI = [0.44-1.45], P = 0.46). In one study, the intravascular injection rate using a blunt-tip needle was lower than that using a sharp needle. In another study, the Whitacre and the blunt-tip needle have similar intravascular injection rates, while, the catheter-extension needle showed a reduced intravascular injection rate. Conclusions: This meta-analysis showed that the Whitacre needle reduced the intravascular injection rate as compared with the Quincke needle, but failed to establish that the Chiba needle can decrease the intravascular injection rate in TFEI. Moreover, the blunt-tip needle can reduce the intravascular injection rate compared with the Quincke needle, and the catheter-extension needle can reduce the intravascular injection rate compared with the Whitacre and the blunt-tip needle.