一种适用于液动阀门的手自一体电控液动执行机构

在一般工况企业中,阀门的驱动方式主要有手动（包括齿轮传动）、电动、气动和液动等,用户根据各自的条件选择不同的阀门驱动方式.80年代初期,为适应选煤行业的恶劣工况及日益提高的自动化要求,研制了液动阀门驱动装置一电控液动执行机构.该执行机构集机、电、液于一体,适用于驱动带介质压力启闭的阀门.历经20余年的研究开发,经过大量的试验室试验和工业性试验,电控液动执行机构的技术已日趋成熟.

Revascularization for Iliac-femoral Artery Pseudoaneurysm with Greater Saphenous Vein

Objective To investigate the role of revascularization procedures with autologous greater saphenous vein in surgical management of iliac-femoral artery pseudoaneurysm in parenteral drug abusers. Methods Twenty-one patients with iliac-femoral artery pseudoaneurysm caused by parenteral drug abuse from 2004 to 2007 were enrolled. Among them,15 patients were male and 6 were female; their average age was 31.3 years. The size of pseudoaneurysms ranged from 3.0 cm to 7.5 cm. Common femoral artery and distal external iliac artery were often involved. We performed arterial reconstruction on these patients with autologous greater saphenous vein as a graft after excising iliac-femoral artery pseudoaneurysm through a single curved inguinal incision. All patients were followed up,and the complications were recorded. Results The surgical procedures were finished without intraoperative mortality or perioperative complications. All patients were free of claudication symptoms after the surgery except one case with preoperative popliteal artery stenosis. One case of infection and wound tissue fistula was found later. One case had inguinal incisional hematoma and another complained of numbness in thigh skin. Conclusions The use of autologous greater saphenous venous grafts for arterial reconstruction after pseudoaneurysm excision in drug abusers is safe and effective. This technique offers more advantages than arterial ligation alone without revascularization. An optimal greater saphenous venous graft is a prerequisite for revascularization.

Advantage of autologous blood transfusion in surgery for hepatocellular carcinoma

AIM: To evaluate the significance of autologous blood transfusion (AT) in reducing homologous blood transfusion (HT) in surgery for hepatocellular carcinoma (HCC). METHODS: The proportion of patients who received HT was compared between two groups determined by the time of AT introduction; period A (1991-1994, n = 93) and period B (1995-2000, n = 201). Multivariate logistic regression analysis was performed in order to identify independent significant predictors of the need for HT. We also investigated the impact of AT and HT on long-term postoperative outcome after curative surgery for HCC. RESULTS: The proportion of patients with HT was significantly lower in period B than period A (18.9% vs 60.2%, P < 0.0001). Multivariate logistic regression analysis identified AT administration as a significant independent predictor of the need for HT (P < 0.0001). Disease-free survival in patients with AT was comparable to that without any transfusion. Multivariate analysis identified HT administration as an independent significant factor for poorer disease-free survival (P = 0.0380). CONCLUSION: AT administration significantly decreased the need for HT. Considering the postoperative survival disadvantage of HT, AT administration could improve the long-term outcome of HCC patients.

LAPAROSCOPIC SURGERY IN PATIENTS WITH HYPOVOLEMIC SHOCK DUE TO ECTOPIC PREGNANCY

Objective To evaluate the feasibility and safety of operative laparoscopy for ectopic pregnancy with hypovolemic shock. Methods Two hundred and fifteen women with ectopic pregnancy underwent operative laparoscopy. These patients were divided into two groups. The study group included 21 patients with shock and intraperitoneal hemorrhage more than 1000 mL, and control group included 194 patients, hemodynamically stable, with blood loss less than 1000 mL. Clinical data of perio-perative periods in two groups were retrospectively analyzed. Results All patients were tubal pregnancies. The occurrence rate of tubal rupture was higher in study group than in control group (80.95% vs. 15.98%, P < 0.001). Intraabdominal blood loss was significantly higher in study group than in control group (1900 mL vs. 300 mL, P < 0.001), and autologous blood transfusions were given to 95.24% and 9.3% of patients in study and control group, respectively (P < 0.001). Laparoscopic salpingectomy was performed on 85.7 % and 50.5% of patients in study and control group (P < 0.001). The operative time was somewhat longer in study group than that in control group (60 minutes vs. 45 minutes), but with no significant difference. All patients had no perioperative complications. Conclusion Operative laparoscopy in patients with hopovolemic shock can be safely and effectively performed by experi-enced laparoscopists with the aid of optimal anesthesia, advanced cardiovascular monitoring, and autologous blood transfusion.

Clinical trial of three treatment methods for pterygium

Objective:To study the effect of simple excision, amniotic membrane transplantation(AMT)and limbal-conjunctival autograft transplantation(LCAT)for treating pterygium. Methods: Forty-eight cases (48 eyes) with pterygium were randomly assigned to 3 groups:16 cases (16 eyes) with pterygium underwent simple excision (group A), 16 eyes underwent amniotic membrane transplantation (AMT) (group B), and 16 eyes with pterygia underwent limbal- conjunctival transplantation (group C).Results: With follow-up of 3 months to 25 months, 5 cases (31%) of pterygia in group A and 1 case (6.2%) of pterygia in group B showed recurrence. No patients in group C developed recurrence. Conclusion: The recurrent rate of pterygium after amniotic membrane transplantation and limbal-conjunctival autograft transplantation were much lower, but the latter was more simple, safe and no rejection .So limbal - conjunctival autograft transplantation is the best surgery method for pterygium.

Intestinal autotransplantation

Most abdominal neoplasms involving the root of the superior mesenteric artery and/or celiac artery are difficult to manage with conventional operative techniques because of limited intestinal ischemia times and poor accessibility to the tumor region.Ex vivo surgery followed by intestinal autotransplantation(IATx)is a relatively novel surgical strategy to offer chances for complete resection in such hopeless circumstances.This review aims to assess potential surgical indications,operative techniques and clinical outcomes after IATx.Currently the main indications reported for IATx broadly include pancreatic,mesenteric and retroperitoneal neoplasms closely involving the superior mesenteric vessels.The preliminary results show that radical resection can be effectively achieved in carefully selective patients.Although perioperative morbidity and mortality are relatively high,there are several long-term survivors,particularly after complete resection of benign and low-grade tumor.Early tumor recurrence,however,remains a major problem in patients with high-grade tumor,particularly pancreatic ductal carcinoma.In conclusion,IATx allows patients with selected abdominal neoplasms involving themajormesenteric vessels to be completely resected.However,this aggressive approach is associated with a considerable operative risk,and should only be performed at experienced centers.Additional and adjunctive treatment therapies are required to improve the efficacy of this treatment.