Ameroid Constrictor
Ameroid Constrictor - Related Videos
08:22
A Chronic Cardiac Ischemia Model in Swine Using an Ameroid Constrictor
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Cited by 14 •
2017
The purpose of this protocol is to demonstrate the placement of a delayed constricting device (an ameroid constrictor) around a coronary artery in a swine model. This device creates an ischemic area of the heart that is useful for studying new diagnostic imaging techniques and new methods of treatment.
07:57
Methods for Acute and Subacute Murine Hindlimb Ischemia
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Cited by 31 •
2016
Surgical induction of hindlimb ischemia in the mouse is useful to examine angiogenesis, however this is compromised in certain inbred mouse strains that display marked ischemia-induced tissue necrosis. Methods are described to induce subacute limb ischemia using ameroid constrictors to circumvent this problem through the induction of gradual arterial occlusion.
07:31
In vivo Micro-circulation Measurement in Skeletal Muscle by Intra-vital Microscopy
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Cited by 5 •
2007
A new versatile method for observation of microcirculation is presented. It is considered suitable for long-term observation, and for combination with pharmacophysiological or molecular biological interventions.
05:25
Identification and Protection of the Recurrent Laryngeal Nerve during Transoral Robotic Thyroidectomy
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2025
The aim of this article is to present a method for identifying and protecting the recurrent laryngeal nerve during robotic thyroidectomy through the oral vestibular approach in the absence of the laryngeal nerve monitor.
FAQs
The device relies on the hygroscopic behavior of its casein insert, meaning the material absorbs tissue fluid after implantation. As the insert takes up fluid, it swells within the surrounding metal ring and gradually compresses the vessel. This material-driven expansion creates a controlled change in vessel diameter rather than an immediate closure.
Gradual compression gives the liver and portal circulation time to adapt to changing blood-flow patterns. This staged process can reduce abnormal flow while avoiding an abrupt vascular change. The adaptation period is important because the treatment aims not only to narrow the abnormal connection, but also to lessen associated metabolic complications.
The casein insert supplies the swelling mechanism, while the metal ring encloses and directs that expansion around the target vessel. Their combination allows fluid absorption to translate into progressive compression. The interaction between these components distinguishes the device from approaches that depend on immediate mechanical blockage.
An immediate occlusion method stops flow at once, whereas this constrictor is designed to narrow the abnormal connection progressively. That difference changes the biological response: the liver and portal circulation receive time to adjust instead of confronting an instantaneous loss of the shunt pathway. The intended result is controlled reduction of abnormal vascular flow.
Veterinary surgeons implant the device in selected animals with congenital portosystemic shunts, which are abnormal vascular connections that bypass normal portal circulation. The procedure places the constrictor where its delayed compression can reduce shunt flow over time. Suitability depends on selecting cases in which gradual vascular closure is an appropriate treatment strategy.
Their clinical purpose is to reduce abnormal blood flow and related metabolic complications while allowing circulatory adaptation. Beyond treating selected animal patients, these devices support the study of gradual vascular occlusion in surgical practice. They therefore connect a practical veterinary intervention with investigation of how controlled vessel narrowing affects the portal circulation.