15 results about "Retrograde Flow" patented technology

A noninvasive patient-specific method is provided to aid in the analysis, diagnosis, prediction or treatment of hemodynamics of the cardiovascular system of a patient. Coronary blood flow and pressure can be predicted using a 3-D patient image-based model that is implicitly coupled with a model of at least a portion of the remaining cardiovascular system. The 3-D patient image-based model includes at least a portion of the thoracic aorta and epicardial coronaries of the patient. The shape of one or more velocity profiles at the interface of the models is enforced to control complex flow features of recirculating or retrograde flow thereby minimizing model instabilities and resulting in patient-specific predictions of coronary flow rate and pressure. The invention allows for patient-specific predictions of the effect of different or varying physiological states and hemodynamic benefits of coronary medical interventions, percutaneous coronary interventions and surgical therapies.

Devices, systems, and methods for causing retrograde oxygenated blood flow in at least a portion of the venous system of the myocardium are disclosed. Devices and methods include a method for causing retrograde oxygenated blood flow in at least a portion of the venous system of the myocardium, the method comprising: implanting a variable occluder in a coronary sinus region proximate a left atrium, wherein the variable occluder is configured to gradually increase a level of blood flow restriction over a period of days to enable a venous system of the myocardium to compensate for increased pressure caused by the gradual increase in the level of blood flow restriction; and following venous system compensation, shunting oxygenated blood flow into the coronary sinus to cause retrograde flow of oxygenated blood in at least a portion of the venous system of the myocardium to thereby enable revascularization of the myocardium.

A method of providing embolic protection for carotid stent implantation includes advancing an arterial sheath into an arterial system of a patient and advancing a venous sheath into a venous system of the patient. A fluid connection may be established between the venous sheath and the arterial sheath to enable retrograde flow of blood through the arterial sheath. The artery sheath may be advanced through the vasculature into the patient's carotid artery and the inflatable balloon may be inflated within the patient's carotid artery to block smooth blood flow therein. An interventional tool may be advanced through the interior lumen of the arterial sheath, the interventional tool sized such that a portion of the cross-sectional area of the interior lumen of the arterial sheath remains open for retrograde flow of blood.

Devices, systems, and methods for causing retrograde oxygenated blood flow in at least a portion of the venous system of the myocardium are disclosed. Devices and methods include a method for causing retrograde oxygenated blood flow in at least a portion of the venous system of the myocardium, the method comprising: implanting a variable occluder in a coronary sinus region proximate a left atrium, wherein the variable occluder is configured to gradually increase a level of blood flow restriction over a period of days to enable a venous system of the myocardium to compensate for increased pressure caused by the gradual increase in the level of blood flow restriction; and following venous system compensation, shunting oxygenated blood flow into the coronary sinus to cause retrograde flow of oxygenated blood in at least a portion of the venous system of the myocardium to thereby enable revascularization of the myocardium.

Devices, systems, and methods for causing retrograde oxygenated blood flow in at least a portion of the venous system of the myocardium are disclosed. Devices and methods include a method for causing retrograde oxygenated blood flow in at least a portion of the venous system of the myocardium, the method comprising: implanting a variable occluder in a coronary sinus region proximate a left atrium, wherein the variable occluder is configured to gradually increase a level of blood flow restriction over a period of days to enable a venous system of the myocardium to compensate for increased pressure caused by the gradual increase in the level of blood flow restriction; and following venous system compensation, shunting oxygenated blood flow into the coronary sinus to cause retrograde flow of oxygenated blood in at least a portion of the venous system of the myocardium to thereby enable revascularization of the myocardium.

Methods and devices are configured for neurointerventional procedures. The methods and devices enable safe and rapid access to the cerebral or intracranial arteries for the introduction of interventional devices such as to treat stroke and / or other disease conditions. The methods and devices include a vascular access and retrograde flow system that can be used safely and rapidly in the neurointerventional procedures.

Disclosed herein are technologies for addressing elevated left-sided filling pressures to mitigate the effects of diastolic dysfunction. Embodiments provide ways to decrease the temporal increase in blood flow and pressure into the heart from the venous system. Under exertion, there is a shift of blood from the 'unstressed' reservoir of vasculature, which primarily comprises the splanchnic system, to the 'stressed' reservoir, which comprises the heart and lungs. By inhibiting this acute shifting of blood from the 'unstressed' reservoir to the 'stressed' reservoir, an undesirable influx of blood volume to the already overloaded left heart can be avoided. Certain embodiments provide ways to increase atrial elasticity, or atrial compliance. This enhancement of atrial compliance enables the atrium to 'absorb' the energy of short bursts of high left atrial pressure. Consequences are a reduction in the retrograde flow in the pulmonary veins to inhibit acute pulmonary congestion.

Embodiments herein provide a Pulmonary Circulation Assist Implant for passively regulating the cardiovascular blood flow in a subject born with a univentricular heart. The Pulmonary Circulation Assist Implant is configured to avoid a head-on collision between the bloodstreams from a Superior Vena Cava (SVC) and an Inferior Vena Cava (IVC) without an offset between them. Further, the Pulmonary Circulation Assist Implant is configured to smoothly distribute the SVC blood and IVC hepatic blood to both lungs in equal proportions without swirling. Also, the Pulmonary Circulation Assist Implant is configured to avoid the occurrence of retrograde flow and reduce power loss.

Devices, systems, and methods for causing retrograde oxygenated blood flow in at least a portion of the venous system of the myocardium are disclosed. Devices and methods include a variable occluder for implantation in a coronary sinus region proximate a left atrium, wherein the variable occluder is configured to gradually increase a level of blood flow restriction over a period of days to enable a venous system of the myocardium to compensate for increased pressure caused by the gradual increase in the level of blood flow restriction. Following venous system compensation, oxygenated blood flow is shunted into the coronary sinus to cause retrograde flow of oxygenated blood in at least a portion of the venous system of the myocardium to thereby enable revascularization of the myocardium.

A noninvasive patient-specific method is provided to aid in the analysis, diagnosis, prediction or treatment of hemodynamics of the cardiovascular system of a patient. Coronary blood flow and pressure can be predicted using a 3-D patient image-based model that is implicitly coupled with a model of at least a portion of the remaining cardiovascular system. The 3-D patient image-based model includes at least a portion of the thoracic aorta and epicardial coronaries of the patient. The shape of one or more velocity profiles at the interface of the models is enforced to control complex flow features of recirculating or retrograde flow thereby minimizing model instabilities and resulting in patient-specific predictions of coronary flow rate and pressure. The invention allows for patient-specific predictions of the effect of different or varying physiological states and hemodynamic benefits of coronary medical interventions, percutaneous coronary interventions and surgical therapies.

Methods and devices are configured for neurointerventional procedures. The methods and devices enable safe and rapid access to the cerebral or intracranial arteries for the introduction of interventional devices such as to treat stroke and / or other disease conditions. The methods and devices include a vascular access and retrograde flow system that can be used safely and rapidly in the neurointerventional procedures.

Devices, systems, and methods for causing retrograde oxygenated blood flow in at least a portion of the venous system of the myocardium are disclosed. Devices and methods include a method for causing retrograde oxygenated blood flow in at least a portion of the venous system of the myocardium, the method comprising: implanting a variable occluder in a coronary sinus region proximate a left atrium, wherein the variable occluder is configured to gradually increase a level of blood flow restriction over a period of days to enable a venous system of the myocardium to compensate for increased pressure caused by the gradual increase in the level of blood flow restriction; and following venous system compensation, shunting oxygenated blood flow into the coronary sinus to cause retrograde flow of oxygenated blood in at least a portion of the venous system of the myocardium to thereby enable revascularization of the myocardium.

The utility model discloses a thyroid gland drainage tube which comprises a connecting mechanism, a drainage mechanism is installed on the top of the connecting mechanism, the connecting mechanism comprises a shell, two flow guide channels are formed in the inner surface of the shell and combined to form a Y-shaped or U-shaped tubular flow guide channel, a discharge channel is formed in the bottom of the shell, and the discharge channel is communicated with the drainage mechanism. The drainage mechanism comprises a drainage tube, a limiting channel is formed in the bottom of the drainage tube, and an anti-backflow ball is arranged in the limiting channel and located above the arc-shaped supporting piece. The drainage device can be used for simultaneously draining the thyroid bed and the surgical operation part in the side neck area, and can also prevent drainage liquid from retrograde flowing into the body of a patient to cause infection.

Disclosed herein are technologies for addressing elevated left-sided filling pressures to mitigate the effects of diastolic dysfunction. Embodiments provide ways to decrease the temporal increase in blood flow and pressure into the heart from the venous system. Under exertion, there is a shift of blood from the 'unstressed' reservoir of vasculature, which primarily comprises the splanchnic system, to the 'stressed' reservoir, which comprises the heart and lungs. By inhibiting this acute shifting of blood from the 'unstressed' reservoir to the 'stressed' reservoir, an undesirable influx of blood volume to the already overloaded left heart can be avoided. Certain embodiments provide ways to increase atrial elasticity, or atrial compliance. This enhancement of atrial compliance enables the atrium to 'absorb' the energy of short bursts of high left atrial pressure. Consequences are a reduction in the retrograde flow in the pulmonary veins to inhibit acute pulmonary congestion.

The utility model discloses a knee joint hydrops lavage device, which relates to the field of injection and comprises a puncture needle, a three-way connecting piece, a suction tube and a flushing tube, the tail of the puncture needle is fixedly connected with the three-way connecting piece, the inside of the three-way connecting piece is divided into an inner cavity and an outer cavity, the inner cavity is communicated with the flushing tube, and the outer cavity is communicated with the suction tube. The outer cavity is communicated with the suction pipe; an anti-reverse cavity is formed in the middle section of the inner cavity, a miniature spring is installed in the anti-reverse cavity, the miniature spring is connected with a blocking block, the blocking block blocks the joint of the inner cavity and the anti-reverse cavity to block circulation of flushing fluid, the puncture needle is divided into an inner needle body and an outer needle body, the inner cavity is communicated with the inner needle body, and the outer cavity is communicated with the outer needle body. Flushing liquid and waste liquid can be completely separated, the problem that a flushing loop is polluted can be effectively solved, in addition, the inner cavity used for flushing has the effect of preventing the flushing liquid from flowing backwards, and the situation that the waste liquid flows backwards and enters the flushing loop due to misoperation of operators can be avoided.