38 results about "Carotid artery.internal" patented technology

Methods and apparatus are provided for removing emboli during an angioplasty, stenting or surgical procedure comprising a catheter having an occlusion element, an aspiration lumen, and a blood outlet port in communication with the lumen, a guide wire having a balloon, a venous return sheath with a blood inlet port, and tubing that couples the blood outlet port to the blood inlet port. Apparatus is also provided for occluding the external carotid artery to prevent reversal of flow into the internal carotid artery. The pressure differential between the artery and the vein provides reverse flow through the artery, thereby flushing emboli. A blood filter may optionally be included in-line with the tubing to filter emboli from blood reperfused into the patient.

Methods and apparatus are provided for removing emboli during an angioplasty, stenting or surgical procedure comprising a catheter having an occlusion element, an aspiration lumen, and a blood outlet port in communication with the lumen, a guide wire having a balloon, a venous return catheter with a blood inlet port, and tubing that couples the blood outlet port to the blood inlet port. Apparatus is also provided for occluding the external carotid artery to prevent reversal of flow into the internal carotid artery. The pressure differential between the artery and the vein provides reverse flow through the artery, thereby flushing emboli. A blood filter may optionally be included in-line with the tubing to filter emboli from blood reperfused into the patient.

Methods and apparatus are provided for removing emboli during an angioplasty, stenting or surgical procedure comprising a catheter having an occlusion element, an aspiration lumen, and a blood outlet port in communication with the lumen, a guide wire having a balloon, a venous return catheter with a blood inlet port, and tubing that couples the blood outlet port to the blood inlet port. Apparatus is also provided for occluding the external carotid artery to prevent reversal of flow into the internal carotid artery. The pressure differential between the artery and the vein provides reverse flow through the artery, thereby flushing emboli. A blood filter may optionally be included in-line with the tubing to filter emboli from blood reperfused into the patient.

An implantable device for positioning in the vicinity of the bifurcation of the common carotid artery (CCA) into the internal carotid artery (ICA) and the external carotid artery (ECA), comprises a deflecting element suitable to deflect the flow of embolic material flowing in the CCS toward the ICA, into the ECA, without filtering.

The invention provides a medical device having a catheter and first and second expandable members. The device may be used for protection against stroke by inserting the catheter into a carotid artery, locating the first expandable member within a common carotid artery, locating the second expandable member within an external carotid artery, expanding the first expandable member to occlude the common carotid artery, and expanding the second expandable member to at least partially obstruct the external carotid artery. By this method antegrade blood flow in the internal carotid artery stops.

An intravascular lead is used to deliver energy for stimulating nervous system targets using energy delivery elements (e.g. electrodes) that are in direct contact with the nervous system targets. The lead may be positioned within the internal jugular vein and the nervous system targets may include the carotid artery/carotid sinus bulb and/or associated baroreceptor afferents, and/or surrounding nervous system targets in the region of the internal jugular vein, such as the carotid sinus nerve and/or associated nerve branches and/or the vagus nerve and/or associated nerve branches. Stimulation energy travels along a conductive bridge that extends from the intravascular lead to the nervous system target, or is relayed from the intravascular lead to another device disposed within or surrounding the target structure.

An elongate tubular body extends between a rotatable cutter and a control. The cutter is connected to the control with a rotatable element. A vacuum is applied through an annular passage defined between the tubular body and the rotatable element. The tubular body has a sufficiently small outside diameter and sufficient kink resistance and pushability to navigate through arteries such as the internal carotid artery.

Interventional procedures on the carotid arteries are performed through a transcervical access while retrograde blood flow is established from the internal carotid artery to a venous or external location. A system for use in accessing and treating a carotid artery includes an arterial access device, a shunt fluidly connected to the arterial access device, and a flow control assembly coupled to the shunt and adapted to regulate blood flow through the shunt between at least a first blood flow state and at least a second blood flow state. The flow control assembly includes one or more components that interact with the blood flow through the shunt.

The invention provides a method and system for introducing cool fluid to a targeted treatment site, such as, for example, a stroke-affected brain hemisphere. In one approach, the method generally includes introducing a catheter into a branch artery of the external carotid artery, and introducing fluid into the ipsilateral internal carotid artery. In one approach, a balloon is used to occlude the external carotid artery during introduction of the fluid into the internal carotid artery.

The invention belongs to the field of intersection of a computer technology and medical images, and in particular relates to an automatic dividing method of internal and external profiles in the cross section direction of an ultrasound image carotid artery blood vessel. The method specifically comprises the following steps of: selecting the current frame image; manually defining a reference profile point and interpolating to form a reference profile; extrapolating the reference profile to form a first interested area; automatically detecting a carotid artery profile: searching a radial gradient maximum point on a polar coordinate image obtained through conversion in a first interested area as the initial external profile point, estimating the gray probability density distribution in the first interested area by using mixed distribution, carrying out level set evolution to obtain the external profile, interpolating the external profile to form an initial internal profile and carrying out level set evolution to obtain an internal profile. By adopting the method, ultrasound carotid artery images can be effectively divided, and the workload of doctors can be reduced; and besides, the carotid artery internal and external profiles obtained through division in the method can be used for calculating the size of the carotid artery blood vessel wall and providing accurate and effective information for research of carotid atherosclerosis.

The invention relates to a method for establishing a rat external carotid artery catheter-indwelled cerebral ischemia reperfusion model. The method includes the following steps that: the direction of an external carotid artery blood vessel of a rat is drifted, the direction of the external carotid artery blood vessel of the rat is drifted to a position which is consistent with or parallel to the direction of an internal carotid artery blood vessel of the rat; the external carotid artery blood vessel is cut, a suture is inserted into an incision, so that cerebral ischemia can be formed in the neck of the rat; and 1 to 2 hours after the suture is inserted into the incision, and cerebral ischemia is formed, the suture is pulled out, and a catheter injection bag through which medicine can be injected repeatedly is arranged into the external carotid artery blood vessel. According to the method, an external carotid artery suture method is adopted to manufacture the rat ischemia reperfusion model, and therefore, the normal structures of an operation-side common carotid artery and an internal carotid artery can be protected; the catheter injection bag through which medicine can be injected repeatedly is indwelled in the external carotid artery, medicine can be injected into the internal carotid artery through the artery catheter repeatedly at different time points; nerve functional assessment after the model is established can be realized, and qualified animals could be accepted and subjected to experimental intervention, and therefore, the scientific nature of experiments can be greatly improved.

A medical device having a catheter and one or more expandable constricting/occluding members. The catheter is adapted for use with therapeutic or diagnostic devices, including an angioplasty/stent catheter and an atherectomy catheter. A first constrictor/occluder mounted at the distal end of the catheter is adapted for placement in a brachiocephalic or subclavian artery. A second constrictor mounted proximal to the first constrictor/occluder is adapted for placement in the descending aorta. Pressure measuring devices may be included, and filters may be used to capture embolic debris. Methods of using the devices for preventing distal embolization during extracranial or intracranial carotid procedures or vertebral artery procedures by augmenting collateral cerebral circulation by coarctation of the aorta to enhance reversal of blood flow in an internal carotid artery, an external carotid artery, and/or a common carotid artery toward the subclavian artery are disclosed.

A method may include accessing a terminal branch of an ophthalmic artery through a face of a subject via first device. Additionally, the method may include positioning the first device or a second device within the ophthalmic artery of the subject and treating a blockage, a stenosis, a lesion, plaque or other physiology in the ophthalmic artery or a junction between an internal carotid artery and the ophthalmic artery.

The present invention provides a method and device for preventing cerebral embolization during endovascular procedures in the carotid arteries. The invention comprises a guide catheter and balloon, which may selectively occlude the common carotid artery, and further comprises a wire and balloon, which may selectively occlude the internal carotid artery. Occlusion of the common carotid artery will induce retrograde flow at the site, redirecting emboli to the external carotid artery. Occlusion of the internal carotid artery reduces the risk of emboli migrating to the brain, and allows clearance of the site by antegrade blood flow from the common carotid artery. Occlusion of both the common and internal carotid arteries induces a quiescent state at the site during the procedure. Control of blood flow by selective inflation and deflation of either or both balloons, in concert with the procedures, will reduce the risk of emboli migrating to the brain.

The invention discloses a method for making a guinea pig MCAO (middle cerebral artery occlusion) model, which comprises the steps of preparing an anesthetic, weighing a guinea pig, and injecting a certain amount of the anesthetic into the abdominal cavity according to the weight of the guinea pig, so that the guinea pig is anesthetized; placing the guinea pig on a temperature control blanket, fixing the guinea pig on an operating table with the body of the guinea pig straight and free of tension, scraping the neck hair of the guinea pig with a hair clipper, and locally sterilizing with entoiodine; cutting the skin along the paracervical median of the guinea pig to open the anterior cervical fascia and expose the sternocleidomastoid muscle on the right side, then separating the anterior cervical muscle group and sternocleidomastoid muscle, and drawing with a fine silk thread to separate the muscle tissues until a complete CCA (common carotid artery) is observed. Compared with the traditional common carotid artery plug-in method, the method has the advantages that blood is directly supplied from the common carotid artery through the internal carotid artery after reperfusion, the common carotid artery is directly ligated after reperfusion, the reperfusion blood supply can only be circulated through lateral branches, the reperfusion effect similar to the clinical effect can be achieved, and the success rate of model preparation is high.

Devices and methods establish and facilitate retrograde or reverse flow blood circulation in the region of the carotid artery bifurcation in order to limit or prevent the release of emboli into the cerebral vasculature such as into the internal carotid artery. The methods are particularly useful for interventional procedures performed through a transcarotid approach or transfemoral into the common carotid artery.

The invention discloses an implantable internal carotid artery constant-speed injection device and an operation method thereof. A sealing cover and a sealing plug which not only have a sealing effect,but also can be pierced by a needle are separately arranged at the top end and the rear end of a common carotid artery implanting guide tube, an injection opening which is covered by a one-way circulating door is formed in the front end of the common carotid artery implanting guide tube, flow speed and time are controlled through a controller, a constant-speed injection micro-pump is driven to push an injection syringe, and cancer cells or injection drugs flow into common carotid artery blood vessels through an injection opening of the common carotid artery implanting guide tube. By the implantable internal carotid artery constant-speed injection device, a surgical method can be simple and convenient, surgical steps are simplified, and surgery time is shortened; and meanwhile, a surgery mode of for an animal model of mouse internal carotid artery injection will be changed completely, the external carotid artery of a mouse does not need to be sutured, pneumogastric nerves and blood vessels cannot be damaged, and the success rate of the surgery is greatly increased.

The invention provides a Y-shaped carotid artery stent with an absorbable self-protruding membrane branch, so as to treat carotid artery stenosis. The Y-shaped carotid artery stent is characterized bycomprising an inner net pipe, which is a hollow pipe; an outer net pipe, which is arranged on the outer wall of the inner net pipe in a sleeving manner; and a membrane pipe, which is mounted betweenthe inner net pipe and the outer net pipe and is arranged on the outer wall of the inner net pipe in a sleeving manner, wherein each of the inner net pipe, the outer net pipe and the membrane pipe hasa trunk part, a first branch part and a second branch part opposite to the first branch part; one end of the trunk part is communicated with the ends of the corresponding first branch part and the corresponding second branch part to form an integrated Y shape matched with the shape of a bifurcation structure; the trunk parts are placed in the common carotid artery; the corresponding first branchparts are placed in the internal carotid artery; the corresponding second branch parts are placed in the external carotid artery; the inner net pipe and the outer net pipe are both pipes of mesh structures made of memory metal wires; and the pore size of the inner net pipe is less than that of the outer net pipe.

The invention provides a sectional composite dense net structure carotid artery stent used for being arranged at a divaricate structure of the internal carotid and external carotid artery connected with the common carotid artery so as to treat carotid artery stenosis. The carotid artery stent is characterized by comprising a first supporting tube and a membrane tube, wherein the first supporting tube is in the shape of a conical hollow tube matched with the shapes of the common carotid artery and the internal carotid and is used for being arranged in the common carotid artery and the internalcarotid to further support the common carotid artery and the internal carotid; the membrane tube is arranged on the outer wall of the first supporting tube in a sleeving manner and comprises two straight tube sections and an annular protrusion section connected with the two straight tube sections; the first supporting tube is a tube of a mesh structure made from memory metal wires; the wall thickness of the annular protrusion section is smaller than that of the straight tube section.

An extravascular protective stent includes a booster, a hollow protective tube and a hollow separator all sequentially arranged, wherein the side wall of the protective tube is provided with a protective notch parallel to the central axis of the protective tube and extending through two ends of the protective tube. During use of the separator and the protective tube when an internal carotid artery is exposed after a common carotid artery bifurcation is separated via a submandibular incision, the separator and the protective tube wrap the internal carotid artery in sequence, allowing the separating notch and the protective notch to face outward, and the closed wall thereof to face inward and directly face the surgery direction, such that a surgeon can thoroughly excise diseased tissue in surgery and avoid hemorrhage caused by accidentally injuring the internal carotid artery during the surgery, and improve the surgical efficacy.