Electrocoagulation ; instrumentation ; methods ; Humans ; Tonsillectomy ; instrumentation ; methods

We here in the paper, not only introduce the development of electricsurgical operation equipment in our country and foreign countries but also represent the characters, principles and usages of several kinds electrosurgical equipment in foreign countries.
Argon ; Catheter Ablation ; instrumentation ; Electrocoagulation ; instrumentation ; Electrosurgery ; instrumentation ; Humans ; Ions

Electrocoagulation ; instrumentation ; Humans ; Larynx ; surgery ; Microsurgery ; instrumentation ; Needles

A novel system is proposed to control the liquid nitrogen cooling and radio frequency heating of tissue to achieve effective thermal ablation in the treatment using fuzzy logic controller and fuzzy logic PID type controller separately. Results of ex-vivo pig liver experiments demonstrate that this system is useful and could p control the desired treatment procedure.
Algorithms ; Animals ; Computer Simulation ; Cryotherapy ; instrumentation ; methods ; Electrocoagulation ; instrumentation ; methods ; Equipment Design ; Fuzzy Logic ; Liver ; Swine

BACKGROUND: The efficacy of saline-coupled bipolar sealing devices in joint arthroplasty is uncertain, and the utility in simultaneous bilateral total knee arthroplasty (TKA) has not been reported. METHODS: This study compares the use of bipolar sealing and conventional electrocautery in 71 consecutive patients. The experimental and control groups were matched for age, sex, body mass index, American Society of Anesthesiologists (ASA) classification, and preoperative hemoglobin. Variables of interest included blood loss, transfusion requirements, and operative characteristics. RESULTS: In comparison to patients treated with conventional electrocautery, those treated with the bipolar sealer were 35% less likely to require transfusion. The median number of transfusions per case was also significantly lower in the experimental group. Hemoglobin change, total blood loss, and length of stay were not significantly different between the groups. The experimental group had longer operative times. CONCLUSIONS: Bipolar sealing shows promise as a blood loss reduction tool in simultaneous bilateral TKA. The marginal savings attributed to reduced transfusion rates with use of the bipolar sealer did not exceed the additional per-case expense of using the device. The decision to use the device with the goal of less blood loss must come with the additional expense associated with its use.
Adult ; *Arthroplasty, Replacement, Knee ; Blood Loss, Surgical/*prevention & control ; Catheter Ablation/instrumentation ; Electrocoagulation/*instrumentation ; Female ; Humans ; Male

OBJECTIVE: To determine whether saline-enhanced dual probe bipolar radiofrequency ablation (RFA) using perfused-cooled electrodes shows better in-vitro efficiency than monopolar or single probe bipolar RFA in creating larger coagulation necrosis. MATERIALS AND METHODS: RF was applied to excised bovine livers in both bipolar and monopolar modes using a 200W generator (CC-3; Radionics) and the perfused-cooled electrodes for 10 mins. After placing single or double perfused-cooled electrodes in the explanted liver, 30 ablation zones were created at three different regimens: group A; saline-enhanced monopolar RFA, group B; saline-enhanced single probe bipolar RFA, and group C; saline-enhanced dual probe bipolar RFA. During RFA, we measured the tissue temperature at 15 mm from the electrode. The dimensions of the ablation zones and changes in the impedance currents and liver temperature during RFA were then compared between the groups. RESULTS: The mean current values were higher for monopolar mode (group A) than for the bipolar modes (groups B and C) : 1550+/-25 mA in group A, 764+/-189 mA in group B and 819+/-98 mA in group C (p < 0.05). The volume of RF-induced coagulation necrosis was greater in group C than in the other groups: 27.6+/-2.9 cm3 in group A, 23.7+/-3.8 cm3 in group B, and 34.2+/-5.1 cm3 in group C (p < 0.05). However, there was no significant difference between the short-axis diameter of the coagulation necrosis in the three groups: 3.1+/-0.8 cm, 2.9+/-1.2 cm and 4.0+/-1.3 cm in groups A, B and C, respectively (p > 0.05). The temperature at 15 mm from the electrode was higher in group C than in the other groups: 70+/-18 degrees C in group A, 59+/-23 degrees C in group B and 96+/-16 degrees C in group C (p < 0.05). CONCLUSION: Saline-enhanced bipolar RFA using dual perfused-cooled electrodes increases the dimension of the ablation zone more efficiently than monopolar RFA or single probe bipolar RFA.
Animals ; Catheter Ablation/*instrumentation ; Cattle ; Comparative Study ; Electrocoagulation ; In Vitro ; Liver/pathology/*surgery ; Necrosis ; Sodium Chloride ; Support, Non-U.S. Gov't

OBJECTIVE: To determine in vivo efficacy of radiofrequency ablation (RFA) in porcine liver by using 15-gauge Octopus(R) (15-G Octopus(R)) electrodes to create a large coagulation. MATERIALS AND METHODS: A total of 18 coagulations were created by using a 180-W generator and 15-G Octopus(R) electrodes during laparotomy, performed in 14 pigs. Coagulation necrosis was created in the pig livers by the use of one of three RFA protocols: 1) group A, monopolar RFA using a 15-G Octopus(R) electrode with a 5-mm inter-electrode distance (n = 4); 2) group B, monopolar RFA using a 15-G Octopus(R) electrode with a 10-mm inter-electrode distance (n = 6); and 3) group C, switching monopolar RFA using two 15-G Octopus(R) electrodes (n = 8). The energy efficiency, shape, maximum and minimum diameters (Dmx and Dmi), and the volume of the coagulation volume were measured in each group. The Summary statistics were obtained and Mann-Whitney test was were performed. RESULTS: The mean ablated volume of each group was 49.23 cm3 in A, 64.11 cm3 in B, and 72.35 cm3 in C. The mean Dmx and Dmi values were 5.68 cm and 4.58 cm in A and 5.97 cm and 4.97 cm in B, respectively. In group C, the mean diameters of Dmx and Dmi were 6.80 cm and 5.11 cm, respectively. The mean ratios of Dmi/Dmx were 1.25, 1.20, and 1.35 in groups A, B, and C, respectively. There was one animal death during the RFA procedure, the cause of which could not be subsequently determined. However, there were no other significant, procedure-related complications during the seven-hour-delayed CT scans. CONCLUSION: RFA procedures using 15-G Octopus(R) electrodes are useful and safe for creating a large ablation in a single electrode model as well as in the multiple electrodes model.
Animals ; Catheter Ablation/*methods ; Electrocoagulation/*instrumentation ; *Electrodes ; Liver/radiography/*surgery ; Statistics, Nonparametric ; Swine ; Tomography, X-Ray Computed

Adolescent ; Adult ; Aged ; Aged, 80 and over ; Electrocoagulation ; instrumentation ; methods ; Epistaxis ; surgery ; Female ; Humans ; Male ; Middle Aged ; Young Adult

Anastomotic stenosis of the colon is not an uncommon finding; however, its frequency varies from one study to another. Traditionally, postoperative colonic stenosis is managed surgically. However, endoscopic therapy has recently become the preferred treatment modality over traditional surgery. Good short-term success has been achieved with use of endoscopic balloon dilation; however, restenosis may occur over time in 14% to 25% of patients. The current report showed the effectiveness and usefulness of an insulated-tip knife (IT-knife) for electrocautery therapy of a patient with symptomatic anastomotic colonic stenosis.
Aged ; Colonoscopy ; Constriction, Pathologic/*therapy ; Electrocoagulation/instrumentation/*methods ; Humans ; Male ; Middle Aged ; Rectal Neoplasms/radiography/*surgery ; Sigmoid Neoplasms/radiography/*surgery ; Tomography, X-Ray Computed

OBJECTIVE: A number of new techniques have been developed to prevent lymphocele formation after pelvic lymphadenectomy in gynecologic cancers. We assessed whether the electrothermal bipolar vessel sealing device (EBVSD) could decrease the incidence of postoperative lymphocele secondary to pelvic lymphadenectomy. METHODS: A total of 321 patients with gynecologic cancer underwent pelvic lymphadenectomy from 2005 to 2011. Pelvic lymphadenectomy without EBVSD was performed in 134 patients, and pelvic lymphadenectomy with EBVSD was performed in 187 patients. We retrospectively compared the incidence of lymphocele and symptoms between both groups. RESULTS: Four to 8 weeks after operation, 108 cases of lymphocele (34%) were detected by computed tomography scan examination. The incidence of lymphocele after pelvic lymphadenectomy was 56% (75/134) in the tie ligation group, and 18% (33/187) in the EBVSD group. We found a statistically significant difference in the incidence of lymphocele between both groups (p<0.01). To detect the independent risk factor for lymphocele development, we performed multivariate analysis with logistic regression for three variables (device, number of dissected lymph nodes, and operation time). Among these variables, we found a significant difference (p<0.001) for only one device. CONCLUSION: Use of the EBVSD during gynecological cancer operation is useful for preventing the development of lymphocele secondary to pelvic lymphadenectomy.
Adult ; Electrocoagulation/instrumentation/*methods ; Female ; Genital Neoplasms, Female/pathology/*surgery ; Humans ; Lymph Node Excision/adverse effects/*methods ; Lymphatic Metastasis ; Lymphocele/etiology/*prevention & control ; Middle Aged ; Neoplasm Staging ; Pelvis ; Retrospective Studies ; Risk Factors