22 results about "Total occlusion" patented technology

A catheter for centrally crossing an occluded blood vessel includes a catheter body having a distal end, a proximal end, and a central passage. A rotatable drive shaft extending through the central passage and has a distal end, a proximal end, and a central lumen. A cutting tip is mounted on the distal end of the rotatable drive shaft and configured to cut through occlusive material when rotated. A plurality of spiral or other flat springs is disposed circumferentially about a distal portion of the catheter body to maintain centering of the catheter and form a passage as the catheter is advanced through a chronic total occlusion.

In one embodiment, a system includes a small-diameter tube having an elongated body, a distal tip, and an inner lumen that extends the length of the tube, the distal tip including a magnetic element that generates a strong focal magnetic field, and a crossing wire having an elongated body and a distal tip, the distal tip of the crossing wire including a ferromagnetic element that is magnetically attracted to the distal tip of the small-diameter tube when the distal tip of the crossing wire is placed in proximity to the distal tip of the small-diameter tube so as to facilitate alignment of the distal tips.

Microcatheter systems for crossing total occlusions are provided. Aspects of the systems include: a microcatheter with proximal and distal regions, the distal region comprising a fixed, sealed end, wherein the microcatheter comprises a lumen that receives liquid and gas, a fluid introduction module for introducing liquid and gas into the microcatheter lumen and an actuator that repeatedly pressurizes a liquid and gas mixture present within the microcatheter lumen such that the distal region of the microcatheter vibrates, moving the microcatheter across a total occlusion. Also provided are methods for modulating a total occlusion, e.g., by crossing a total occlusion or modifying a proximal cap thereof, e.g., by producing a divot or hole in the proximal cap. The systems and methods find use in a variety of different applications, including balloon angioplasty applications or other catheter-based therapies or treatments, such as conditions in which a total occlusion may be present in a vessel, including, for example, cardiovascular disease.

Devices and methods for the treatment of chronic total occlusions are provided. One disclosed embodiment comprises a method of facilitating treatment via a vascular wall defining a vascular lumen containing an occlusion therein. The method includes providing an intravascular device having a distal portion with a side port, inserting the device into the vascular lumen, positioning the distal portion in the vascular wall, directing the distal portion within the vascular wall such that the distal portion moves at least partially laterally, and directing the side port towards the vascular lumen.

This invention provides a method and apparatus for reconstructing chronically totally occluded coronary arteries (CTOs). The method includes: obtaining multiple first markers on a forward angiographic image of the CTO during interventional treatment, each first marker corresponding to the location of multiple markers; obtaining multiple second markers on a reverse angiographic image of the CTO, each second marker corresponding to the location of multiple markers; and reconstructing the occluded segment of the coronary artery between the proximal and distal segments based on the composite image to connect the proximal and distal segments, thereby obtaining a reconstructed angiographic image containing the intact lesion. This invention effectively solves the problems of requiring an additional vascular access and bidirectional angiography in interventional treatment of CTOs in related technologies, reducing the risks and surgical costs associated with these technologies.

The application relates to the technical field of medical devices, and discloses a radiofrequency ablation guide wire system for opening a chronic total occlusion of a blood vessel. The system comprises a radiofrequency guide wire, a monitoring device, a control device, a feedback device and a radiofrequency generator. The radiofrequency guide wire has a movable electrode and a return electrode composed of a plurality of expandable and contractible return sub-electrodes. The monitoring device monitors the current, impedance and temperature of each return sub-electrode in real time. The control device judges the positional relationship of the electrodes and adjusts the radiofrequency output according to the monitoring data. The feedback device provides a position adjustment prompt in the form of sound, light or visual display. The system can further comprise functional components such as a snaring structure, a radio-opaque marker and a hollow inner core. The application improves the precision, safety and operation convenience of chronic total occlusion interventional treatment, reduces the dependence on X-ray contrast, simplifies the surgical procedure, and has a wide clinical application prospect.

An apparatus includes a processor circuit that communicates with an intravascular imaging catheter. The processor circuit controls the intravascular imaging catheter to obtain multiple intravascular images of a first blood vessel of vasculature while positioned within the vasculature. The first blood vessel includes a chronic total occlusion (CTO). The processor circuit identifies an anatomical feature associated with the CTO and / or an interventional device for treatment of the CTO in an intravascular image of the multiple intravascular images. The processor circuit outputs, to a display in communication with the processor circuit, a screen display that includes: the intravascular image; and a visual representation associated with the anatomical feature and / or the interventional device. The visual representation provides an indication, to a user, of the identification of the anatomical feature and / or the interventional device in the intravascular image.

The present invention relates, inter alia, to catheters comprising roll films and methods of using roll film catheters through stenosis or chronic total occlusion.

Devices and methods for exploiting intramural (e.g., subintimal) space of a vascular wall to facilitate the treatment of vascular disease, particularly total occlusions. For example, the devices and methods disclosed herein may be used to visually define the vessel wall boundary, protect the vessel wall boundary from perforation, bypass an occlusion, and / or remove an occlusion.

An occlusion catheter system is provided for at least partial occlusion of a vessel. The occlusion catheter system includes a proximal hub having an inflation connection port and an inflation pathway. An inflation catheter member is fluidly connected to the proximal hub. An occlusion balloon has a proximal balloon end and a distal balloon end, the proximal balloon end being fluidly connected to the inflation catheter member. A distal catheter member is connected to the distal balloon end and includes an atraumatic tip on a distal end thereof, the atraumatic tip having a substantially circular profile in one configuration. The occlusion balloon, the inflation catheter member and the distal catheter member have a greatest outer diameter of less than 7 Fr in an uninflated condition.

A system for selecting a collateral vessel to perform a retrograde chronic total occlusion (CTO) treatment procedure is provided. The system includes one or more processors configured to: receive angiographic image data (120) representative of an occlusion in a target blood vessel; analyzing the angiography image data (120) to identify one or more candidate collateral vessels (1501... i) for approaching the occlusion in the target vessel in a retrograde direction; and assigning a suitability score to each candidate collateral vessel (1501... i), the suitability score representing a suitability of the vessel for performing the retrograde CTO treatment procedure on the occlusion.

Microcatheter systems for crossing total occlusions are provided. Aspects of the systems include: a distal crosser unit and an actuator. In embodiments, the distal crosser unit comprises: a microcatheter having a guidewire lumen; a guidewire present in the guidewire lumen and extending beyond the distal end of the microcatheter; a proximal balloon attached to both the microcatheter and the guidewire, wherein the proximal balloon is configured to longitudinally expand; and a distal anchor member present on the guidewire. In such embodiments, the actuator is configured to sequentially inflate and deflate the proximal balloon such that the distal crosser unit progressively moves across a chronic total occlusion. Also provided are methods for modulating a total occlusion, e.g., by crossing a total occlusion or modifying a proximal cap thereof, e.g., by producing a divot or hole in the proximal cap. In addition, standalone distal crosser units and kits comprising components of the systems described herein are provided. The systems, units, methods and kits find use in a variety of different applications, including balloon angioplasty applications or other catheter-based therapies or treatments.

A system and method is provided for generating ultrasound at the tip of an intravascular catheter. This may be used for the treatment of vascular occlusions, including chronic total occlusions (CTOs) and thrombotic occlusions (e.g., deep vein thrombosis, stroke, myocardial infarction). For instance, the systems and methods may be used to induce cavitation to enhance the enzymatic degradation of a vascular occlusion. In some configurations, the approach employs a hollow cylindrical transducer, electrically stimulated in the radial direction at a frequency corresponding to the length mode excitation, thereby projecting ultrasound forwards past the catheter tip. This design overcomes electrical impedance issues for the generation of low frequencies with a smaller diameter transducer capable of negotiating a coronary artery. The hole within the transducer may accommodate a guidewire to facilitate its placement adjacent to the proximal portion of the occlusion.

The invention relates to the technical field of interventional medical instruments, and particularly discloses a catheter assembly for coronary artery interventional therapy, the catheter assembly comprises a catheter body and a guide structure arranged at the far end of the catheter body, a penetrating guide cavity helpful for guiding a micro catheter is formed in the catheter body, and a guide part is of a trumpet-shaped structure and is communicated with the guide cavity; by arranging the guide section with the inner diameter matched with the outer diameter of the micro-catheter, axial guide and support can be provided in the micro-catheter propelling process, the butt joint difficulty of the micro-catheter and the guide wire is reduced, and the micro-catheter or the guide wire can be guided to enter the catheter smoothly. And the stability and smoothness of orbit establishment in the coronary artery chronic complete occlusion interventional therapy process are improved.

In one embodiment, a system includes a small-diameter tube having an elongated body, a distal tip, and an inner lumen that extends the length of the tube, the distal tip including a magnetic element that generates a strong focal magnetic field, and a crossing wire having an elongated body and a distal tip, the distal tip of the crossing wire including a ferromagnetic element that is magnetically attracted to the distal tip of the small-diameter tube when the distal tip of the crossing wire is placed in proximity to the distal tip of the small-diameter tube so as to facilitate alignment of the distal tips.

An apparatus for treating an intravascular total occlusion may include a self-orienting device including an elongate shaft and an inflatable orienting element. The shaft includes an inflation chamber having a first non-circular shape and a working chamber having a second non-circular shape. The inflatable orientation element includes first and second inflatable members extending laterally from the shaft. The outer diameter of the shaft is 0.045 inches or less, the cross-sectional area of the first non-circular cross-sectional shape is at least 0.00013 square inches, and the cross-sectional area of the second non-circular cross-sectional shape is at least 0.00056 square inches. The shaft may include a distal tail extending distally from the inflatable orientation element, the distal tail being at least 15 millimeters long. The shaft may include a plurality of first apertures in communication with the working chamber and disposed in the distal tail.

This invention discloses an anchoring-guided microcatheter and its operation method. The anchoring-guided microcatheter comprises, from distal to proximal, a distal tip, a balloon anchoring body, an internal tube, a rear external tube, and a handle. The internal tube forms a continuous guidewire lumen, through which the guidewire enters from the proximal guidewire lumen interface and exits from the distal tip, providing guidewire support throughout the catheter's length. An independent injection chamber is formed between the rear external tube and the internal tube, allowing the balloon to inflate and retract, thereby achieving anchoring and fixation of the lesion area. The distal tip is a pre-formed fixed-angle structure with radiopaque properties, which, together with the radiopaque ring within the balloon, enables precise visual tracking of the distal end of the catheter and the anchoring position. This invention integrates anchoring, guidance, and radiopaque into a single unit, resulting in a simple and reliable structure that eliminates the need for complex active adjustment mechanisms. It can safely and efficiently pass through complex and tortuous vessels such as coronary arteries and peripheral CTO (chronic total occlusion), significantly improving the stability, positioning accuracy, and operational safety of interventional procedures.

A microcatheter system for crossing total occlusions including a distal crosser unit and an actuator is disclosed. The distal crosser unit comprises: a microcatheter having a guidewire lumen; a guidewire present in the guidewire lumen and extending beyond the distal end of the microcatheter; a proximal balloon attached to both the microcatheter and the guidewire, wherein the proximal balloon is configured to longitudinally expand; and a distal anchor member present on the guidewire. And the actuator is configured to sequentially inflate and deflate the proximal balloon such that the distal crosser unit progressively moves across a chronic total occlusion.

A blood pump for supporting a patient's heart includes a flow cannula having a distal portion including a distal end and a proximal portion including a proximal end opposite the distal end, the distal end of the flow cannula configured to be connected to the patient's heart or a blood vessel to establish fluid communication between the blood pump and the patient's heart and blood vessel, respectively. The flow cannula further includes an intermediate portion attached to the distal portion and the proximal portion, wherein the intermediate portion allows twisting thereof with a lower force than the distal portion and the proximal portion. The intermediate portion can be fully occluded by twisting it. At least a portion of the intermediate portion either alone or in combination with the distal portion is adapted to be permanently attached to the patient's heart or a blood vessel.

A reentry catheter for crossing a vascular occlusion includes an elongate flexible tubular body, having a proximal end, a distal end and at least one lumen extending there through. A reentry zone on the tubular body includes at least two and preferably three sets of opposing pairs of axially spaced exit apertures in communication with the lumen. The apertures are rotationally offset from each other and aligned in a spiral pattern around the tubular body. A method of crossing a chronic total occlusion includes the steps of advancing the reentry catheter across the occlusion via a channel formed in the subintimal space, and advancing a guidewire via a selected exit port into the native lumen distally of the occlusion. The catheter may be removed, leaving the guidewire across the occlusion to guide further interventional devices.

A vascular guide wire device comprising: a guide wire comprising a guide wire head and a laser-acoustic head sensor configured to navigate in a patient's blood vessel, said laser-acoustic head sensor connected via an optic fiber threaded through said guide wire device with a laser-acoustic diode controlled by a laser-acoustic diode controller; a computerized system electronically communicating with said laser-acoustic head sensor, said computerized system comprising a computer, image processing means and display means and configured to provide images and measurements 2-centimeters ahead inside a patient's arteries occlusions therein purposing to move and navigate safely into the right artery lumen; first steering means connected with said guide wire head and configured to navigate said laser-acoustic head sensor according to said image processing results; and opening means connected with said guide wire head for opening total occlusion of said artery.