Technical Note A Simple Method for Reproducing Polaroid Images as Transparencies

1977 ◽  
Vol 1 (1) ◽  
pp. 161-162
Author(s):  
Lawrence R. Kuhns ◽  
Timothy Zeddies ◽  
Allan J. Martin
Keyword(s):  
Technical Note ◽  
Simple Method

scholarly journals A Simple Method to Avoid Brain Shift during Neuronavigation: Technical Note

2020 ◽  
Author(s):  
Jair Leopoldo Raso
Keyword(s):  
Dura Mater ◽  
Brain Area ◽  
Conventional Technique ◽  
Technical Note ◽  
Cortical Surface ◽  
Brain Shift ◽  
Simple Method ◽  
Cortex Area ◽  
Neuronavigation System ◽  
The Brain

Abstract Introduction The precise identification of anatomical structures and lesions in the brain is the main objective of neuronavigation systems. Brain shift, displacement of the brain after opening the cisterns and draining cerebrospinal fluid, is one of the limitations of such systems. Objective To describe a simple method to avoid brain shift in craniotomies for subcortical lesions. Method We used the surgical technique hereby described in five patients with subcortical neoplasms. We performed the neuronavigation-guided craniotomies with the conventional technique. After opening the dura and exposing the cortical surface, we placed two or three arachnoid anchoring sutures to the dura mater, close to the edges of the exposed cortical surface. We placed these anchoring sutures under microscopy, using a 6–0 mononylon wire. With this technique, the cortex surface was kept close to the dura mater, minimizing its displacement during the approach to the subcortical lesion. In these five cases we operated, the cortical surface remained close to the dura, anchored by the arachnoid sutures. All the lesions were located with a good correlation between the handpiece tip inserted in the desired brain area and the display on the navigation system. Conclusion Arachnoid anchoring sutures to the dura mater on the edges of the cortex area exposed by craniotomy constitute a simple method to minimize brain displacement (brain-shift) in craniotomies for subcortical injuries, optimizing the use of the neuronavigation system.

Minimally Invasive Echo-Guided Placement Of The Cardiac Tube In A Ventriculoatrial Shunt During Pregnancy: Technical Note

2007 ◽  
Vol 61 (suppl_5) ◽  
pp. ONSE398-ONSE398
Author(s):  
Licia Di Muro ◽  
Roberto Pallini ◽  
Domenico Pietrini ◽  
Christian Colizzi ◽  
Luca Denaro
Keyword(s):  
Minimally Invasive ◽  
Internal Jugular Vein ◽  
Right Atrium ◽  
Jugular Vein ◽  
Technical Note ◽  
Invasive Technique ◽  
Success Rates ◽  
Ventriculoatrial Shunt ◽  
Simple Method ◽  
Sonographic Guidance

Abstract Objective: We describe a minimally invasive echo-guided placement of the cardiac tube in a ventriculoatrial shunt in a young pregnant woman, in order to avoid any radiological procedure. Methods: We used a central venous catheter placement kit for percutaneous echo-guided right internal jugular vein puncture located by a 7.5 mHz microlinear probe. Through the catheter, the distal portion of the shunt device was positioned into the internal jugular vein to the right atrium using ultrasound control by a 2.5 to 3.5 mHz probe in a four-chamber transthoracic view. Results: Sonographic guidance in percutaneous placement of a vertebral artery shunt is a safe and fast minimally invasive technique that improves success rates and decreases complications such as incidental puncture of the carotid artery and pneumothorax. The use of a two-dimensional echocardiographic apparatus in a four-chamber transthoracic view is an accurate and simple method to verify the position of the distal tip of the shunt in the mid-right atrium with no risks for the patient. Conclusion: The use of these two techniques allows a minimally invasive, safe, accurate, and complete x-ray-free procedure.

Undisturbed pit sampling of tropical red clay soils

1991 ◽  
Vol 7 (1) ◽  
pp. 485-490
Author(s):  
M. G. Culshaw ◽  
K. J. Northmore ◽  
P. R. N. Hobbs
Keyword(s):  
Technical Note ◽  
Clay Soils ◽  
Triaxial Testing ◽  
Red Clay ◽  
High Quality ◽  
Simple Method ◽  
Open Structure ◽  
Rock Types ◽  
Undisturbed Samples ◽  
Volcanic Deposits

AbstractThe tropical red clay soils, formed by the Quaternary weathering of volcanic deposits (and other rock types) in tropical and subtropical environments, have a very open structure and consequent high voids ratio. These soils are particularly sensitive to disturbance during sampling and subsequent transportation and extrusion of the samples. This technical note describes a simple method for obtaining high quality, undisturbed samples from pits in a way that does not require extrusion or trimming of the sample in the laboratory prior to triaxial testing, and only minimal preparation prior to oedometer testing.

Easy Sellar Reconstruction in Endoscopic Endonasal Transsphenoidal Surgery with Polyester-Silicone Dural Substitute and Fibrin Glue: Technical Note

Neurosurgery ◽  
2001 ◽  
Vol 49 (2) ◽  
pp. 473-476 ◽  
Author(s):  
Paolo Cappabianca ◽  
Luigi Maria Cavallo ◽  
Giuseppe Mariniello ◽  
Oreste de Divitiis ◽  
Alicia Del Carmen Becerra Romero ◽  
...  
Keyword(s):  
Fibrin Glue ◽  
Transsphenoidal Surgery ◽  
Technical Note ◽  
Easy Method ◽  
Endoscopic Endonasal ◽  
Simple Method ◽  
Dural Substitute ◽  
Endoscopic Endonasal Transsphenoidal Surgery ◽  
Watertight Closure ◽  
Sellar Reconstruction

Abstract OBJECTIVE To describe a simple method of sellar reconstruction after endoscopic endonasal transsphenoidal surgery that will allow rapid watertight closure of the sellar floor. METHODS A bent sheet of a polyester-silicone dural substitute, fashioned for this purpose with scissors, is introduced into the sella after removal of the lesion. Because of the consistency of the sheet, it opens spontaneously and becomes stuck. Autologous fat tissue or gelatin foam is positioned thereafter, followed by another layer of the dural substitute; a film of fibrin glue completes the sealing. RESULTS Fifteen patients underwent this method and no postoperative cerebrospinal leak or other complication was experienced. CONCLUSION This easy method of sellar reconstruction represents an effective and fast possibility to perform the final step of the endoscopic transsphenoidal procedure, which otherwise may cause maneuverability problems in the limited space of one nostril.

Preservation of Large Bridging Veins of the Cranial Base: Technical Note

Neurosurgery ◽  
2001 ◽  
Vol 48 (2) ◽  
pp. 447-449 ◽  
Author(s):  
Kazuhiko Kyoshima ◽  
Susumu Oikawa ◽  
Shigeaki Kobayashi
Keyword(s):  
Cranial Base ◽  
Technical Note ◽  
Dural Sinus ◽  
Neurosurgical Procedures ◽  
Simple Method ◽  
Medial Side ◽  
Transsylvian Approach ◽  
Bridging Veins ◽  
Bridging Vein ◽  
Brain Retraction

Abstract OBJECTIVE Sacrifice of a bridging vein in the cranial base occasionally may cause significant postoperative morbidity. We report a simple method for preserving large bridging veins of the cranial base by reflecting the dura when a subtemporal or transsylvian approach is used. METHODS In the subtemporal approach, when a larger bridging vein enters the dura attached to the bone of the temporal base before it empties into the dural sinus, the dura is dissected widely from the bone and is cut vertically toward the medial side of the temporal base in front of the entrance of the vein into the dura. The dura, which includes part of the entrance and interdural course of the vein, is reflected and retracted over the brain. In the transsylvian approach, when the bridging segment of the superficial sylvian vein becomes taut because of retraction of the temporal lobe, the dura is incised along the sphenoid ridge and is dissected and freed from the sphenoid bone. RESULTS AND CONCLUSION This dura-reflecting technique facilitates brain retraction without exerting tension on the bridging vein of the cranial base and is expected to help avoid injury to bridging veins during neurosurgical procedures.

scholarly journals Inverted reamer technique for bone grafting of the acetabulum: technical note

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Yuki Okutani ◽  
Hiroshi Fujita ◽  
Hideto Harada ◽  
Masanao Kataoka ◽  
Yu Shimizu ◽  
...  
Keyword(s):  
Femoral Head ◽  
Bone Graft ◽  
Bone Grafting ◽  
Technical Note ◽  
Bone Stock ◽  
Simple Method ◽  
Press Fit ◽  
Resected Femoral ◽  
Cemented Total Hip Arthroplasty ◽  
Bone Coverage

Abstract Background Socket fixation with bone grafting for dysplastic hips is technically demanding, and inadequate coverage of the socket may cause poor results in patients with severely dysplastic hips. An accurate technique to form a bone graft to fit into the defect is necessary. We aim to introduce the simple method of bone grafting, “inverted reamer technique” in cemented total hip arthroplasty (cTHA). Methods After acetabular preparation with a normal acetabular reamer, the bone graft was prepared from the resected femoral head with the inverted reamer. The graft can be press-fit into the defect of the acetabulum with good compatibility through this method. Then, the bone graft was fixed with 1–3 screws and the socket was implanted with bone cement. Results The “inverted reamer technique” can easily and automatically create a well-fit graft. This method is simple and technically less demanding; it can be performed by every surgeon, including trainee and inexperienced surgeons. Conclusion This method can improve the outcome of cTHA for dysplastic hips by preserving bone stock and increasing bone coverage of the socket implanted in the anatomic position.

scholarly journals Technical Note: A simple method for vaterite precipitation in isotopic equilibrium: implications for bulk and clumped isotope analysis

2014 ◽  
Vol 11 (12) ◽  
pp. 17361-17390 ◽  
Author(s):  
T. Kluge ◽  
C. M. John
Keyword(s):  
Oxygen Isotope ◽  
Isotope Fractionation ◽  
Isotope Analysis ◽  
Technical Note ◽  
Major Constituent ◽  
Simple Method ◽  
Oxygen Isotope Fractionation ◽  
Clumped Isotope ◽  
Synthetic Precipitation ◽  
A Minor

Abstract. Calcium carbonate (CaCO3) plays an important role in the natural environment as a major constituent of the skeleton and supporting structure of marine life and has high economic importance as additive in food, chemicals and medical products. Pure CaCO3 occurs in the three different polymorphs calcite, aragonite and vaterite, whereof calcite is the most abundant and best characterized mineral. In contrast, little is known about the rare polymorph vaterite, in particular with regard to the oxygen isotope fractionation between H2O and the mineral. Synthetic precipitation of vaterite in the laboratory typically involves rapid processes and isotopic non-equilibrium, which excludes isotope studies focused on characterization of vaterite at equilibrium conditions. Here, we used a new experimental approach that enables vaterite mineral formation from an isotopically equilibrated solution. The solution consists of a ~ 0.007 mol L-1 CaCO3 solution that is saturated with NaCl at room temperature (up to 6.5 mol L-1). Vaterite precipitated as single phase or major phase (≥ 94%) in experiments performed between 23 and 91 °C. Only at 80 °C was vaterite a minor phase with a relative abundance of 27%. The high mineral yield of up to 235 mg relative to a total dissolved CaCO3 amount of 370 mg enables an investigation of the oxygen isotope fractionation between mineral and water, and the determination of clumped isotope values in vaterite.

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