88 results about "Carotid imt" patented technology

Apparatus and methods for treatment of stroke are provided. In a preferred embodiment, the present invention disposes at least one catheter having a distal occlusive member in either the common carotid artery (CCA) or both the vertebral artery (VA) and the CCA on the hemisphere of the cerebral occlusion. Blood flow in the opposing carotid and/or vertebral arteries may be inhibited. Retrograde or antegrade flow may be provided through either catheter independently to effectively control cerebral flow characteristics. Under such controlled flow conditions, a thrombectomy device may be used to treat the occlusion, and any emboli generated are directed into the catheter(s).

Patients having diminished circulation in the cerebral vasculature as a result of stroke or from other causes such as cardiac arrest, shock or head trauma, or aneurysm surgery or aortic surgery, are treated by flowing an oxygenated medium through an arterial access site into the cerebral vasculature and collecting the medium through an access site in the venous site of the cerebral vasculature. Usually, the cold oxygenated medium will comprise autologous blood, and the blood will be recirculated for a time sufficient to permit treatment of the underlying cause of diminished circulation. In addition to oxygenation, the recirculating blood will also be cooled to hypothermically treat and preserve brain tissue. Isolation and cooling of cerebral vasculature in patients undergoing aortic and other procedures is achieved by internally occluding at least the right common carotid artery above the aortic arch. Blood or other oxygenated medium is perfused through the occluded common carotid artery(ies) and into the arterial cerebral vasculature. Usually, oxygen depleted blood or other medium leaving the cerebral vasculature is collected, oxygenated, and cooled in an extracorporeal circuit so that it may be returned to the patient. Occlusion of the carotid artery(ies) is preferably accomplished using expansible occluders, such as balloon-tipped cannula, catheters, or similar access devices. Access to the occlusion site(s) may be open surgical, percutaneous, or intravascular.

There is disclosed a porous emboli deflector for preventing cerebral emboli while maintaining cerebral blood flow during an endovascular or open surgical procedure. The device prevents the entrance of emboli of a size able to cause stroke (such as greater than 100 microns) from entering either the right or left common carotid arteries, and/or the right or left vertebral arteries by deflecting emboli downstream of these vessels. The device can be placed prior to any manipulation of the heart or aorta allowing maximal protection of the brain during the index procedure. The deflector has a low profile within the aorta which allows sheaths, catheters, or wires used in the index procedure to pass. Also disclosed are methods for insertion and removal of the deflector.

There is disclosed a porous emboli deflector for preventing cerebral emboli while maintaining cerebral blood flow during an endovascular or open surgical procedure. The device prevents the entrance of emboli of a size able to cause stroke (greater than 100 microns in the preferred embodiment) from entering either the right or left carotid arteries by deflecting emboli downstream in the blood flow. The device can be placed prior to any manipulation of the heart or aorta allowing maximal protection of the brain during the index procedure. The device has a low profile within the aorta which allows sheaths, catheters, or wires used in the index procedure to pass. Also disclosed are methods for insertion and removal of the device.

There is disclosed a porous emboli deflector for preventing cerebral emboli while maintaining cerebral blood flow during an endovascular or open surgical procedure. The device prevents the entrance of emboli of a size able to cause stroke (such as greater than 100 microns) from entering either the right or left common carotid arteries, and/or the right or left vertebral arteries by deflecting emboli downstream of these vessels. The device can be placed prior to any manipulation of the heart or aorta allowing maximal protection of the brain during the index procedure. The deflector has a low profile within the aorta which allows sheaths, catheters, or wires used in the index procedure to pass. Also disclosed are methods for insertion and removal of the deflector.

The invention provides a method for augmenting circulation in a patient having carotid stenosis. An elongate tubular member is provided having a lumen communicating with a port at a distal end. The tubular member is inserted into a peripheral artery and the distal port is advanced into a first carotid artery substantially free of a lesion where the patient possesses a second carotid artery substantially occluded by a lesion. Blood is perfused into the first carotid artery through the tubular member. Contralateral flow is augmented to improve perfusion to an ischemic region distal to the carotid stenosis. Angioplasty and stenting can be used to open the lesion in the second carotid artery.

The present invention provides a method and system for determining the cerebral hemodynamic model for depression, using carotid duplex ultrasound to establish percent stenosis of the extracranial right and left internal carotid arteries and transcranial Doppler ultrasound instrument to measure mean flow velocity within the cerebral including the right and left internal carotid arteries, right and left middle cerebral arteries, right and left anterior cerebral arteries, right and left posterior cerebral arteries, and basilar artery. The percent carotid stenosis and the mean flow velocity values in cerebral arteries are used to determine the cerebral hemodynamic model associated with depression in men and women, respectively.

Apparatus and methods for treatment of stroke are provided. In a preferred embodiment, the present invention disposes at least one catheter having a distal occlusive member in either the common carotid artery (CCA) or both the vertebral artery (VA) and the CCA on the hemisphere of the cerebral occlusion. Blood flow in the opposing carotid and/or vertebral arteries may be inhibited. Retrograde or antegrade flow may be provided through either catheter independently to effectively control cerebral flow characteristics. Under such controlled flow conditions, a thrombectomy device may be used to treat the occlusion, and any emboli generated are directed into the catheter(s).

Filtration systems with integrated filter element(s) forming portions of the wall of the filtration catheter are disclosed. The filtration catheters disclosed herein are designed to be used alone or in conjunction with another filter device to provide embolic protection of both carotid arteries. Occlusive element such as balloon is placed on the exterior of the filtration catheter to redirect blood flow in the vessels during the filtration process as well as to help anchor the filtration catheter inside the vessel. The integrated filter element(s) does not require collapsing thus significantly reduces the complexity of the filtration system retrieval process and the chances of releasing emboli back into the blood stream. The compact design of the filtration systems makes them particularly suitable for embolic protection during endovascular procedures on or close to the heart.

A method is described for performing protected angioplasty and stenting of a patient's carotid bifurcation. A self-expanding stent is deployed across a stenosis in the patient's carotid artery. A catheter system that includes a rapid exchange balloon angioplasty catheter with an occlusion balloon catheter positioned through the guidewire lumen is advanced through the guiding catheter and into the distal end of the stent. The occlusion balloon is inflated within the lumen of the stent to occlude the carotid artery and to prevent any embolic debris from traveling downstream from the treatment site. The angioplasty balloon is inflated to dilate the stenosis and to complete the expansion of the self-expanding stent. The angioplasty catheter is withdrawn and any potential embolic debris is aspirated out through the lumen of the guiding catheter. The occlusion balloon is deflated and the catheter system is withdrawn.

The invention belongs to the field of intersection of computer technologies and medical images, and particularly relates to a method for automatic computerized segmentation and analysis on the thickness uniformity of an intima media of a carotid artery blood wall in a sonographic image. The method comprises the following steps of: loading an original blood wall sonographic image; selecting a rectangular region of interest (ROI) containing carotid artery intima media of a far side blood wall; artificially defining or automatically detecting an original contour line by a computer; calculating aone-way edge map; performing binarization and segmentation; detecting two straight segments PLi and SLi serving as partial and correction connection of a lumen intima interface (LII) and a media adventitia interface (MAI) on a sub-image through Hough transformation; obtaining an intima media boundary contour line by adopting double-Snake model evolution; and calculating the thickness uniformity on the basis of two boundaries obtained from segmentation. By the method, problems of noise and discontinuous boundaries in the images can be effectively solved, the purpose of accurate segmentation ofthe intima media boundary is fulfilled and workloads of a doctor can be reduced. Moreover, thickness uniformity parameters obtained on the basis of the method can provide more information for early analysis on atherosclerosis.

A method for automated segmentation of a blood vessel of a head and neck of a subject in a medical image, the method comprising: identifying the location of anatomical landmarks in the medical image; identifying regions of interest in the medical image based on the landmarks; segmenting segments of blood vessels in the medical image; classifying at least one of the segments as defining the blood vessel based on its position relative to the landmarks within the regions of interest to create a classified blood vessel; identifying a starting seed for the blood vessel from the classified blood vessel; identifying an ending seed for the blood vessel from the classified blood vessel; segmenting the blood vessel between the starting seed and the ending seed; and defining a path between the starting seed and the ending seed.

Apparatus and methods are described for performing protected angioplasty and stenting of a patient's carotid bifurcation. An integrated catheter system can be configured in a rapid-exchange version or in an over-the-wire version. The catheter system includes a self-expanding stent, a stent delivery sheath, a combination angioplasty balloon catheter and stent pusher catheter, an embolic protection device and, in the rapid-exchange version, an auto-releasing sheath. The method includes: inserting a guiding catheter to the carotid bifurcation; inserting the catheter system through the guiding catheter; advancing the embolic protection device beyond the lesion; positioning the stent and balloon segment of the catheter system at the lesion; releasing the self-expanding stent; pulling the stent delivery sheath back into the guiding catheter; positioning and deploying the protection member; advancing the combination angioplasty balloon catheter and stent pusher catheter and inflating the angioplasty balloon within the lesion; deflating the angioplasty balloon and withdrawing the combination angioplasty balloon catheter and stent pusher catheter and stent delivery sheath together; and aspirating potential emboli through the guiding catheter.

The invention provides a simple and convenient method and a simple and convenient system for evaluating hemodynamic indexes and characteristic parameters of a blood signal of a carotid arterial system through non-invasive detection on blood pressure of brachial arteries and an axial blood velocity signal of a common carotid artery. The method comprises the following steps: detecting the waveform and a numerical value of an axial blood velocity of the common carotid artery by using a continuous Doppler blood velocity waveform detecting module, detecting diastolic pressure and systolic pressure of a human body by using an arm-type electronic blood pressure detecting module, and then calculating hemodynamic parameters of the carotid arterial system by a simplified method; and selecting Morlet mother wavelet for wavelet analysis on the waveform of the blood velocity of the common carotid artery, and calculating the characteristic parameters of the blood signal. The method is an analysis method which combines the hemodynamic principle and wavelet transformation; compared with the method adopted by the conventional cerebral hemodynamic analysis device, the signal acquisition and analysis method is simpler; and to a great extent, the defects that the conventional analysis device is complicated in structure, huge in volume, complex in operation, high in price and the like are overcome.

The invention provides a device for analyzing cardiovascular and cerebrovascular characteristics and blood characteristics and a detecting method, belonging to the field of medical equipment. The device comprises a pressure pulse wave sensor, a carotid artery and vertebral artery rheogram inductance electrode, an electrocardiogram inductance electrode, a cardiophonogram sensor, a signal receiver, a main processor and an in-out part. The device can realize the cardiovascular and cerebrovascular noninvasive detection, and biomechanically analyzes each branched blood vessel of the cardiovascular and cerebrovascular system by measuring the blood pressure and the blood flow volume of a left cervical vertebra artery, a right cervical vertebra artery, a cerebrum front artery, a cerebrum middle artery, a cerebrum back artery, a left coronary artery and a right coronary artery, obtains biomechanics indexes such as the elasticity coefficient, the compliance, the blood resistance, the blood flow volume and the like of each branched blood vessel of the cardial blood vessel and the brain blood vessel, has an important significance for the early diagnosis of the myocardial infarction and the cerebral thrombosis by taking as equipment for the cardiography, the magnatic resonance imaging MRI, the CT and the like and supplementary equipment between the TCD and the ECG.