Biomedical subjects

Z X Su

Publications and source records attributed to Z X Su.

8 recordsLinked to original sources

PubMed2000

Synthesis of rhodanine-bonded silica gel and its application in the preconcentration and separation of noble metals.

A silica gel based sorbent containing rhodanine as functional group (RDSG) was prepared. Its adsorption and separation characteristics for Ag(I), Au(III) and Pd(II) were studied by flow-injection (FI) on-line preconcentration. Influence of different experimental parameters such as acidity, eluent, co-existing ions were investigated. Trace amounts of Ag, Au and Pd could be efficiently adsorbed by rhodanine-bonded silica gel from acidic solution and eluted with thiourea solution. Common co-existing ions exhibited virtually no interference to the preconcentration and determination. The adsorption capacity of RDSG was 0.0352, 0.107 and 0.122 mmol/g for Ag, Au and Pd, respectively. Detection limits of 0.004, 0.022 and 0.019 microg/mL for Ag, Au and Pd, respectively, were achieved with a sampling time of 60 s at a flow rate of 5.0 mL/min. The relative standard deviation were 0.5%, 0.9% and 1.7% for 0.040 microg/mL Ag, 0.200 microg/mL Au and 0.300 microg/mL Pd. The sorption property did not change after 1,000 cycles of sorption-desorption. The contents of Ag and Au in three national certified ore samples and Pd in a secondary nickel alloy, an anode slime and a CoCl2 electrolytic solution were determined. The results showed good agreement with the certified values.

Journal Article↗

PubMed1998

Localization and surgical treatment of pancreatic insulinomas guided by intraoperative ultrasound.

BACKGROUND: Approximately 20% to 60% of insulinomas cannot be localized preoperatively, and 10% to 20% cannot be found even during surgery. The operative complications associated with the blind surgical explorations are relatively high. METHODS: Between January 1987 and December 1995, intraoperative ultrasound was used to localize insulinomas and guide surgical procedures in 28 patients. RESULTS: Insulinomas were found by intraoperative systematic palpation in 24 patients (85.7%), while intraoperative ultrasound localized the tumors in 27 patients (96.4%). By the combination of these two techniques, all tumors were discovered. The surgical procedures were guided by intraoperative ultrasound. The operative complication rate was 14.3%. CONCLUSION: Intraoperative ultrasound can accurately localize insulinoma, and delineate the spatial relationship between tumor and vital structures, such as pancreatic duct, common bile duct, and critical blood vessels. It can thereby help to increase the successful rate of surgery and avoid unnecessary blind pancreatectomy.

Adolescent↗

PubMed1997

Intraoperative ultrasound-guided transhepatic lithotomy. A new alternative surgical procedure for the management of residual hepatic stones.

BACKGROUND: The high incidence of residual stones has been a major problem in the treatment of hepatolithiasis. Although various imaging techniques have been used to locate the stones, and many different postoperative procedures have been used as remedial modalities to remove the residual calculi, results have been far from satisfactory. OBJECTIVES: To remove obstinate hepatic stones and reduce the incidence of residual calculi. DESIGN: Prospective clinical trial. SETTING: Medical university-affiliated hospital. PATIENTS AND METHODS: Ten patients who had residual intrahepatic stones after conventional operative procedures underwent intraoperative ultrasound (IOUS)-guided transhepatic lithotomy between July 1988 and July 1995. This surgical technique includes accurately locating stones with IOUS, choosing a surgical approach path under the guidance of IOUS while avoiding critical blood vessels and uninvolved biliary tracts, dividing hepatic parenchyma to the involved biliary ducts, and removing the obstinate calculi using the real-time image of IOUS, which is able to monitor the movement of the lithotomy instruments without interruption. MAIN OUTCOME MEASURES: Clinical practical value of IOUS-guided transhepatic lithotomy in the treatment of residual hepatic stones. RESULTS: Complete removal of the stones was achieved in all 10 patients. There were no severe complications or mortality at a median follow-up of 39 months. CONCLUSIONS: IOUS-guided transhepatic lithotomy can greatly decrease the incidence of residual hepatic stones. It is accurate and safe. As a new surgical procedure, IOUS-guided transhepatic lithotomy should be an alternative modality in the management of hepatolithiasis, although the long-term benefits still need to be observed.

Adult↗

PubMed1996

Use of intraoperative ultrasonography during hepatolithectomy.

Complete clearance of intrahepatic stones has long been a major surgical challenge. To reduce the incidence of residual stones, we used intraoperative ultrasonography (IOUS) to localize them and guide lithectomy in 38 patients with hepatolithiasis between July 1988 and December 1993. All patients had multiple intrahepatic stones; 24 had accompanying extrahepatic calculi. Hepatic stones were confined to the left intrahepatic biliary tract in 13 patients, to the right in 9, and in both lobes in 16. Twenty-three patients underwent common bile duct exploration followed by T-tube drainage, 8 had transhepatic lithotomy with or without choledocholithotomy, 3 had choledocolithotomy and Roux-en-Y side-to-side choledochojejunostomy, and 2 had hepaticojejunostomy, left lobectomy was performed in the remainder. In 35 patients cholecystectomy was performed at the same time. Complete clearance of the stones was achieved in 36 patients (94.7%). The incidence of retained stone was decreased to 5.3%. No associated complications occurred. IOUS can accurately localize intrahepatic calculi, directly orient lithotomy instruments to approach the stones, demonstrate the spatial relation between stone and intrahepatic critical structure, and thereby choose an optical route for transhepatic lithotomy. Imaging can be repeated at any time with no radiation exposure to the patient or the medical staff.

Adult↗

PubMed1992

[A new method for transurethral prostatic commissurotomy].

Based on the principles of Shafik's prostatic commissurotomy, we have developed a new transurethral prostatic commissurotomy, which is characterized by cutting, layer by layer and section by section, the urethral mucosa, the bladder muscle layer and the prostate tissue within combined part of the urethra and prostate and by cutting the prostatic capsule with electrocoagulation. The comparison of clinical objective indexes has proved that the method is applicable to high risk patients with prostate hyperplasia and neck contracture leading to urethral obstruction after TURP.

Aged↗

PubMed1990

[Segmental polar nephrectomy].

On the basis of anatomical studies of renal vessels, segmental polar nephrectomy has been designed. The key point is to identify blood-loss area of the segmental pole by interruption of the upper or the lower segmental polar artery before partial nephrectomy. The merits of the procedure are non-compression of the renal pedicle vessels, appropriate extent of the segmental polar nephrectomy and less hemorrhage.

Adult↗

PubMed1989

A study of the renal sinus and its application in stone surgery.

The anatomical structure of the renal sinus was studied in 160 adult cadaver kidneys. Important anatomical features were described in the capsule of the sinus fatty tissue, including capsular septum of the hilus renalis, and the distribution of the posterior pelvic transverse artery. The implications of these findings in stone surgery are discussed.

Humans↗

PubMed1987

Areas for safe percutaneous nephrocentesis--a study of practical anatomy.

The safest percutaneous nephrocentesis route is through the posterolateral aspect of the kidney. From study of 160 kidneys from adults at autopsy, we conclude that the most favorable nephrocentesis area is the lower major renal calyx and its minor calyces or the upper minor calyces. We believe that the lateral aspect of the middle calyces may be an area for safe nephrocentesis.

Adult↗