1.Pay attention to physical test and drafting product standards of the centrifuge apparatus.
Hui XU ; Yufei JIA ; Haixin LI ; Jinzi SONG
Chinese Journal of Medical Instrumentation 2010;34(2):126-128
Compare and analyze the standards related to centrifuge apparatus and make corresponding suggestions in allusion to the problems existed in the test method and physical performance during product standard drafting process.
Blood Component Removal
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instrumentation
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Centrifugation
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instrumentation
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standards
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Device Approval
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standards
2.Repeated operation for removement of polyacrylamide hydrogel from breast.
Da-Li MU ; Jie LUAN ; Lan-Hua MU ; Ling-Yu WANG ; Chen LIU ; Ke-Ming WANG ; Zhuo-Qi ZHANG
Chinese Journal of Plastic Surgery 2008;24(3):187-189
OBJECTIVETo investigate the technique of repeated operation for removement of polyacrylamide hydrogel from breast.
METHODS17 cases after uncomplete removement of PHG were reoperated through inferior periareolar incision. The PHG and affected denatured muscle and gland tissue were removed.
RESULTSPreoperative MRI or CT showed PHG distributed diffusely in muscle and gland. There was only minimal residual PHG after operation. Histological examination showed PHG distributed in the denatured and proliferative fibrous tissue, including giant cells, many neutrophilic cells infiltration, and foreign body granuloma. The symptoms, such as intramammary pump or nodule, chest and back pain, infection, were relieved after operation.
CONCLUSIONSBlinded suction technique can not remove PHG completely and can also result in malposition of PHG and make the tissue denaturation worse. We suggest open approach to remove the PHG and denatured tissue completely through periareolar incision.
Acrylic Resins ; Adult ; Breast Implants ; Device Removal ; methods ; Female ; Humans ; Mammaplasty ; instrumentation ; Middle Aged ; Young Adult
5.Guidewire Breakage during Neurointerventional Procedures: a Report of Two Cases.
Myeong Sub LEE ; Kum WHANG ; Hun Ju KIM ; O Ki KWON
Korean Journal of Radiology 2011;12(5):638-640
We report on two cases of microguidewire breakage that occurred during endovascular treatment of intracranial aneurysms. The microguidewire can be broken when a part of the wire is stuck due to vascular tortuosity, and, subsequently, application of excessive rotational movement. The mechanical and physical properties of a microguidewire are also important factors in microguidewire breakage. We also suggest technical tips for avoidance of this problem.
Aged
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*Catheters
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Device Removal
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Embolization, Therapeutic/*instrumentation
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*Equipment Failure
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Female
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Humans
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Intracranial Aneurysm/*therapy
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Middle Aged
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Radiography, Interventional/*instrumentation
6.Standard versus Rotation Technique for Insertion of Supraglottic Airway Devices: Systematic Review and Meta-Analysis.
Jin Ha PARK ; Jong Seok LEE ; Sang Beom NAM ; Jin Wu JU ; Min Soo KIM
Yonsei Medical Journal 2016;57(4):987-997
PURPOSE: Supraglottic airway devices have been widely utilized as an alternative to tracheal intubation in various clinical situations. The rotation technique has been proposed to improve the insertion success rate of supraglottic airways. However, the clinical efficacy of this technique remains uncertain as previous results have been inconsistent, depending on the variable evaluated. MATERIALS AND METHODS: We systematically searched PubMed, Embase, and the Cochrane Central Register of Controlled Trials in April 2015 for randomized controlled trials that compared the rotation and standard techniques for inserting supraglottic airways. RESULTS: Thirteen randomized controlled trials (1505 patients, 753 with the rotation technique) were included. The success rate at the first attempt was significantly higher with the rotation technique than with the standard technique [relative risk (RR): 1.13; 95% confidence interval (CI): 1.05 to 1.23; p=0.002]. The rotation technique provided significantly higher overall success rates (RR: 1.06; 95% CI: 1.04 to 1.09; p<0.001). Device insertion was completed faster with the rotation technique (mean difference: -4.6 seconds; 95% CI: -7.37 to -1.74; p=0.002). The incidence of blood staining on the removed device (RR: 0.36; 95% CI: 0.27 to 0.47; p<0.001) was significantly lower with the rotation technique. CONCLUSION: The rotation technique provided higher first-attempt and overall success rates, faster insertion, and a lower incidence of blood on the removed device, reflecting less mucosal trauma. Thus, it may be considered as an alternative to the standard technique when predicting or encountering difficulty in inserting supraglottic airways.
Device Removal
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Humans
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Intubation, Intratracheal/instrumentation/*methods/standards
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*Laryngeal Masks
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Randomized Controlled Trials as Topic
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Reference Standards
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Risk
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*Rotation
8.Breakage of a Lag Screw of Cephalomedullary Nail: A Technique of Removal.
Direk TANTIGATE ; Kongkhet RIANSUWAN ; Banchong MAHAISAVARIYA ; Kitichai SUKJAITHAM
Clinics in Orthopedic Surgery 2015;7(2):261-263
A broken lag screw of the cephalomedullary nail is a rare condition. Removal of the retained lag screw from the femoral head is also very challenging. This article describes a surgical technique and the modified instrument that was available in the operating room for removing the broken implant by closed technique.
*Bone Screws
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Device Removal/instrumentation/*methods
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Equipment Design
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Female
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*Femur Head
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Fracture Fixation, Intramedullary/*instrumentation
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Hip Fractures/*surgery
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Humans
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Middle Aged
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*Prosthesis Failure
9.Percutaneous Transhepatic Release of an Impacted Lithotripter Basket and Its Fractured Traction Wire Using a Goose-Neck Snare: a Case Report.
Jae Hyun KWON ; Jun Kyu LEE ; Jin Ho LEE ; Yong Seok LEE
Korean Journal of Radiology 2011;12(2):247-251
In a patient with a distal common bile duct stone, a fracture of the traction wire of the basket occurring during the performance of mechanical lithotripsy resulted in the impaction of the lithotripter basket with a stone. The impacted lithotripter basket combined with a fracture of the traction wire is a rare complication of endoscopic stone removal. We were able to pull the impacted basket using an Amplatz goose-neck snare inserted via the percutaneous transhepatic route, which resulted in the freeing of the entrapped stone into the dilated supra-ampullary bile duct. The fractured traction wire and basket could be safely removed by pulling the traction wire from the mouth. The present report is the first to describe the safe and effective use of an Amplatz goose-neck snare for the management of a lithotripter basket impacted with a stone and a fractured traction wire.
Aged
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Cholangiopancreatography, Endoscopic Retrograde
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Device Removal/*methods
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Diagnosis, Differential
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Equipment Failure
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Gallstones/radiography/*therapy
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Humans
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Lithotripsy/*instrumentation
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Male
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Radiography, Interventional
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Tomography, X-Ray Computed
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Traction/instrumentation
10.Pullout test in expansive unilateral open-door laminoplasty of the cervical spine with OsteoMed M3 plate and screws: the screw orientation matters.
Kong-he HU ; An-min JIN ; Yang DUAN ; Cheng-long LIU ; Shao-xiong MIN ; Li-xin ZHU ; Wei-dong ZHAO
Journal of Southern Medical University 2011;31(5):911-913
OBJECTIVETo study the impact of screw orientation on the pullout strength of OsteoMed M3 titanium screws in expansive unilateral open-door laminoplasty of the cervical spine.
METHODSSix fresh human cervical spine specimens were randomly numbered and OsteoMed M3 plate and screws were used for an expansive unilateral open-door laminoplasty. The screws were inserted in the lateral mass at different extraversion angles (0°, 30° and 45°). The maximum pullout strength was tested on the ElectroForce material testing machine.
RESULTSThe maximum pullout strength was 81.60∓7.33 N, 150.05∓15.57 N, and 160.08∓17.77 N in extraversion angle 0°, 30°, and 45° groups, respectively. The maximum pullout strength was significantly less in extraversion angle 0° group than in 30° and 45° groups (P<0.05), but similar in the latter two groups.
CONCLUSIONThe pullout strength of the screws inserted at an extraversion angle over 30° provides stronger fixation than an angle of 0° in the unilateral open-door laminoplasty using OsteoMed M3 titanium plate and screws.
Adult ; Biomechanical Phenomena ; Bone Plates ; Bone Screws ; Cervical Vertebrae ; surgery ; Cervicoplasty ; instrumentation ; Device Removal ; Fracture Fixation, Internal ; instrumentation ; Humans ; Internal Fixators ; Male ; Materials Testing ; Young Adult