scholarly journals Surgically placed radiopaque markers: Proof‐of‐concept of a novel technique to facilitate percutaneous interventions in neonates and infants

2020 ◽  
Vol 96 (3) ◽  
Author(s):  
Johanna Hummel ◽  
Rouven Kubicki ◽  
Clarence Pingpoh ◽  
Brigitte Stiller ◽  
Matthias Sigler ◽  
...  
Keyword(s):  
Proof Of Concept ◽  
Novel Technique ◽  
Percutaneous Interventions ◽  
Radiopaque Markers ◽  
Neonates And Infants

Utilization of Fluorescein for Identification and Preservation of the Facial Nerve and Semicircular Canals for Safe Mastoidectomy

Neurosurgery ◽  
2010 ◽  
Vol 66 (1) ◽  
pp. 204-207 ◽  
Author(s):  
Cristian Gragnaniello ◽  
Mahmoud Kamel ◽  
Ossama Al-Mefty
Keyword(s):  
Facial Nerve ◽  
Indocyanine Green ◽  
Semicircular Canals ◽  
Sigmoid Sinus ◽  
Facial Canal ◽  
Proof Of Concept ◽  
Novel Technique ◽  
Inflammatory Processes ◽  
Safe Performance ◽  
Air Cells

Abstract OBJECTIVE Mastoidectomy can be a very challenging procedure for many reasons. The normal anatomy can be distorted because of inflammatory processes and tumors and recurrences. Avoiding injuries to the semicircular canals (SCCs) and facial canal is mandatory, and there is need to find a way to recognize the facial nerve and SCCs for safe performance of mastoidectomy. We describe, as a proof of concept, a novel technique to drill the mastoid while allowing the surgeon to recognize and avoid injuries to vital structures, in the cadaver. METHODS Four fresh cadaveric heads (8 sides) were prepared by cannulating the major vessels at the level of the neck. After removal of the mastoid cortex, indocyanine green was injected in the vessels. The sigmoid sinus alongside the facial nerve and SCCs was skeletonized using the drilling guidance provided by the fluorescence. The mucosa covering the air cells of the mastoid is very well vascularized compared with the thick bone representing the outer layer of the SCCs and facial canal. Consequently, after the indocyanine green injection, the mucosa shines whereas the bone does not. The fluorescence guides the drilling displaying air cells that are safe to remove. RESULTS Eight mastoidectomies were performed, resulting in optimal drilling with no injuries to the facial canal and SCCs. CONCLUSION With this novel technique, it is possible to perfectly skeletonize the facial nerve and the SCCs in the cadaver. We think that this technique can be an adjunct in the armamentarium of trainees that are not familiar with the anatomy of the temporal bone and eventually of neurosurgeons facing lesions that require the removal of various degrees of the mastoid.

Chameleon™ PTA balloon catheter: A single device in managing thrombosed AV access

2021 ◽  
pp. 112972982110274
Author(s):  
Ari Kramer ◽  
John Ross ◽  
Antonios P Gasparis
Keyword(s):  
Case Report ◽  
Surgical Procedures ◽  
Balloon Angioplasty ◽  
Balloon Catheter ◽  
Percutaneous Intervention ◽  
Common Procedure ◽  
Novel Technique ◽  
Percutaneous Interventions

Thrombectomy is a common procedure for maintenance of arteriovenous (AV) access and is critical to prolong access life. Techniques for performing thrombectomy are incredibly diverse, ranging from open surgical procedures to percutaneous interventions. Percutaneous interventions include a combination of thrombectomy devices to clear the thrombus and balloon angioplasty to treat the underlying lesion. In this case report we describe a novel technique using a single device, the Chameleon™ PTA balloon catheter (Medtronic, Minneapolis, MN) balloon catheter, to safely and efficiently perform a percutaneous intervention.

Intracoronary electrocardiogram to guide percutaneous interventions in coronary bifurcations – a proof of concept: the FIESTA (Ffr vs. IcEcgSTA) study

2018 ◽  
Vol 14 (5) ◽  
pp. e530-e537 ◽  
Author(s):  
Dobrin Vassilev ◽  
Liubomir Dosev ◽  
Carlos Collet ◽  
Kiril Karamfiloff ◽  
Jivka Stoikova ◽  
...  
Keyword(s):  
Proof Of Concept ◽  
Percutaneous Interventions

PD08-05 CAN INTRA-VESICLE ULTRASOUND SURFACE MAPPING REPLACE CYSTOSCOPY? NOVEL TECHNIQUE AND PROOF OF CONCEPT

2019 ◽  
Vol 201 (Supplement 4) ◽  
Author(s):  
Tareq Aro* ◽  
Sunghwan Lim ◽  
Doru Petrisor ◽  
Dan Stoianovici
Keyword(s):  
Proof Of Concept ◽  
Surface Mapping ◽  
Novel Technique

scholarly journals Ultrasound-guided percutaneous compartment release: a novel technique, proof of concept, and clinical relevance

2018 ◽  
Vol 48 (6) ◽  
pp. 959-963 ◽  
Author(s):  
Joseph Davies ◽  
Valerie Fallon ◽  
Jimmy Kyaw Tun
Keyword(s):  
Clinical Relevance ◽  
Proof Of Concept ◽  
Ultrasound Guided ◽  
Novel Technique

A safe, reliable, inexpensive and novel technique to localize in the mid thoracic spine in the prone position: Proof of concept and technical illustration

2020 ◽  
Vol 82 ◽  
pp. 83-86
Author(s):  
Merritt D. Kinon ◽  
Joshua A. Benton ◽  
Jonathan Krystal ◽  
Phillip C. Cezayirli ◽  
Samantha Jansson ◽  
...  
Keyword(s):  
Prone Position ◽  
Thoracic Spine ◽  
Proof Of Concept ◽  
Novel Technique ◽  
Technical Illustration

scholarly journals A Novel Technique of Odontoidoplasty and C1 Arch Reconstruction: Anatomical and Biomechanical Basis

2011 ◽  
Vol 68 (suppl_1) ◽  
pp. ons103-ons113 ◽  
Author(s):  
Abhishek Agarwal ◽  
Phillip M Reyes ◽  
Ulises Garcia-Gonzalez ◽  
Daniel D Cavalcanti ◽  
Steve W Chang ◽  
...  
Keyword(s):  
Range Of Motion ◽  
Atlantoaxial Joint ◽  
Proof Of Concept ◽  
Normal Range ◽  
Novel Technique ◽  
Transoral Odontoidectomy ◽  
Flexion Extension ◽  
Before And After ◽  
Arch Reconstruction ◽  
Biomechanical Strength

Abstract BACKGROUND: Transoral odontoidectomy and resection of the anterior C1 arch destabilize the atlantoaxial joint and risk its stability. OBJECTIVE: To preserve stability in such cases we devised and evaluated a proof-of-concept study. The arch and dens were dissected and decompression was performed on cadavers. The dens was replaced with an odontoid screw, and the C1 arch was replaced with a rib-graft substitute using miniplates. We assessed the biomechanical strength of the C1 ring and 3D occipitoatlantoaxial flexibility before and after the repair. METHODS: Five silicon-injected fixed cadaver heads were dissected. The arch of C1 and dens were preserved and reconstructed using odontoid screws and miniplates. Once the feasibility of the technique was established, we biomechanically tested 6 cadaveric occiput-C2 specimens in 3 phases: (1) intact/normal range of motion (ROM), (2) after transection of dens and C1 arch, and (3) with odontoidoplasty using odontoid screws and C1 arch reconstruction. RESULTS: After odontoidectomy and arch removal, angular ROM increased significantly in all directions of loading. Resection increased flexion-extension at the occiput-C1 and at C1-C2 by 21% and 129%, respectively. Reconstruction slightly increased flexion-extension stability (16% and 107%, respectively) relative to normal. With 70 N applied compression, the C1 ring separation was 1145% greater than normal. After reconstruction, the separation was only 89% greater than normal (statistically significant, P = .002). CONCLUSION: C1 arch reconstruction with or without odontoidoplasty restores only partial angular stability of the atlantoaxial joint but provides restoration of the ability of the C1 lateral masses to resist splaying, often observed as postodontoidectomy cranial settling.

Direct measurement of electron-diffraction-pattern intensities using an energy loss spectrometer

1989 ◽  
Vol 47 ◽  
pp. 668-669
Author(s):  
A. G. Jackson ◽  
M. Rowe
Keyword(s):  
Thermal Effects ◽  
Dynamic Range ◽  
Scattering Amplitude ◽  
Dynamical Theory ◽  
Site Symmetry ◽  
Proof Of Concept ◽  
Parallel Acquisition ◽  
Kinematic Approximation ◽  
Speed Up ◽  
Structure Calculations

Diffraction intensities from intermetallic compounds are, in the kinematic approximation, proportional to the scattering amplitude from the element doing the scattering. More detailed calculations have shown that site symmetry and occupation by various atom species also affects the intensity in a diffracted beam. [1] Hence, by measuring the intensities of beams, or their ratios, the occupancy can be estimated. Measurement of the intensity values also allows structure calculations to be made to determine the spatial distribution of the potentials doing the scattering. Thermal effects are also present as a background contribution. Inelastic effects such as loss or absorption/excitation complicate the intensity behavior, and dynamical theory is required to estimate the intensity value.The dynamic range of currents in diffracted beams can be 104or 105:1. Hence, detection of such information requires a means for collecting the intensity over a signal-to-noise range beyond that obtainable with a single film plate, which has a S/N of about 103:1. Although such a collection system is not available currently, a simple system consisting of instrumentation on an existing STEM can be used as a proof of concept which has a S/N of about 255:1, limited by the 8 bit pixel attributes used in the electronics. Use of 24 bit pixel attributes would easily allowthe desired noise range to be attained in the processing instrumentation. The S/N of the scintillator used by the photoelectron sensor is about 106 to 1, well beyond the S/N goal. The trade-off that must be made is the time for acquiring the signal, since the pattern can be obtained in seconds using film plates, compared to 10 to 20 minutes for a pattern to be acquired using the digital scan. Parallel acquisition would, of course, speed up this process immensely.

1623: Percutaneous Interventions in Renal Transplant Complications

2005 ◽  
Vol 173 (4S) ◽  
pp. 439-440
Author(s):  
Erich Lang ◽  
Raju Thomas ◽  
Rodney Davis ◽  
S. Florman ◽  
Erik P. Castle ◽  
...  
Keyword(s):  
Renal Transplant ◽  
Percutaneous Interventions ◽  
Transplant Complications ◽  
Renal Transplant Complications
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