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CT 지표를 이용한 두정-후두부 뇌실 도관의 정확한 삽입
민형식,송준혁,Min, Hyung-Sik,Song, Jun-Hyeok 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.7
Objective : placement of ventricular catheter is important to achieve long-term patency of the shunt system. We describe a method of calculating the insertion site, trajectory, and the length of the ventricular catheter using CT parameters in shunt surgery. Patients and Methods : These can be rapidly obtained using a caliper from a scout cut and two axial scans at lateral ventricular and upper 3rd ventricular level. To compare this technique with traditional one, we analyzed 40 consecutive patients who underwent shunt surgery. Results : Of 20 patients undergoing ventriculoperitoneal shunt insertion using this technique, none had poor location of the proximal catheter. In the counterpart, 9 patients had poor location(p=0.001). The number of patients who required revision surgery were also lower in the group using this technique, but it was not statistically significant (4 versus 2, p=0.422). Mean follow-up period was shorter in this technique group. Conclusion : This technique provides an accurate placement of the proximal catheter without special instrument or additional expenses.
관동정맥기형 파열로 인한 경추강내의 경막외 혈종 - 증례보고 -
민형식,송준혁,김명현,박향권,김성학,신규만,박동빈,Min, Hyung-Sik,Song, Jun-Hyeok,Kim, Myung-Hyun,Park, Hyang-Kwon,Kim, Sung-Hak,Shin, Kyu-Man,Park, Dong-Been 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.3
We report a case of spontaneous cervical epidural hematoma caused by a pure epidural arteriovenous malformation. A 22-year-old woman developed a sudden quadriplegia after a vigourous physical therapy including multiple acupunctures for her neck pain. Emergency cervical magnetic resonance image showed an epidural hematoma in her cervicothoracic junction. Emergent decompressive laminectomy and an evacuation of the hematoma were performed. A soft tissue mass found in the hematoma was proven to be an arteriovenous malformation. Postoperatively, the patient experienced some complications. However, she recovered completely from the motor weakness.
민형식,이광진 충남대학교 의과대학 지역사회의학연구소 1986 충남의대잡지 Vol.13 No.1
27 cases of femoral neck fractures which were treated in department of orthopaedic surgery of CNUH from 1979 Jan. to 1985 Jan, were analysed clinically and radiologically. Very sensitive, noninvasive, simple and easily reproducible bone scanning with 99m Tc was introduced fro early diagnosis of avascular necrosis as a complication of femoral neck fracture. The results were as follows: 1. The most common cause of fracture was slipping and falling down. 2. In classification, transcervical and subcapital fractures were most common in anatomical classification, Pauwels' type I in Pauwels' classification and Garden stage 3 in displacement. 3. Singh index was decreased according to increase of physiological age. 4. Avascular necrosis develops commonly in Pawels' type 3, Garden's stage 4 and subcapital fracture. 5. Satisfactory results were obtained 75% in internal fixation and 85% in head replacement. 6. Bone scan is considered to be significant technique for early detection of vascular impairment to the femoral head after femur neck fracture, and is important in selecting the method of treatment according to results of bone scan.
Li/MnO2 전지(CR15400)양극 활물질의 물리 화학적 성질과 전지의 성능 : 1 . 저온 특성에 관하여 1 . Low Temperature Performances
김유미,민형식,방부길,이진복 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.1
Li/MnO₂전지(CR15400) 설계의 최적화를 위한 과정으로 양극 활물질과 전해액에 대하여 시험하였다. 리튬 전지용 이산화망간은 제조 방법에 따라 EMD와 CMD로 대별되고 있기 때문에 EMD와 CMD 중에서 각각 한가지의 시료를 선택하여 시험한 결과 EMD는 실온에서 용량이 우수하였으며, CMD는 저온 고율 방전 조건에서 탁월한 성능을 보였다. 이와 같은 전지 성능의 차이를 이산화망간의 물리·화학적 성질과 관련시켜 설명하였으며, 저온 고율 방전 특성이 우수하면서도 용량을 만족시키는 전지를 제조하기 위하여 EMD와 CMD를 혼합한 양극활물질을 사용한 결과 원하는 성능을 얻을 수 있었다. 전지의 저온 특성 향상의 방법으로 전해액의 리튬염 농도를 변화시켜 보았으며 성능 향상을 확인할 수 있었다. 본 실험에서 제조한 양극을 사용하여 조립한 CR15400 전지는 전자동 카메라의 전원으로 사용할 수 있는 성능을 가지고 있음을 확인하였다. In the process optimization of CR15400 Li/MnO₂ cell the effects of cathode active material and electrolyte have been investigated. A sample each of typical EMD(Electrolytic Manganese Dioxide) and CMD (Chemical Manganese Dioxide) were chosen to be tested. It was found that cells with EMD was superior in the capacity at room temperature, while the one with CMD gave better performance at high rate or low temperature discharge. These results were explained in terms of physicochemical properties of manganese dioxide. Mixtures of EMD and CMD were used in a successful attempt to obtain good rate capability and low temperature characteristics without losing capacity. Far improvement of low temperature performance, the concentration of Li salt in the electrolyte was changed with good result. The CR15400 cells made using the improved cathode prepared in this work met the performance requirement for the power source of all automatic cameras.