摘要:
Delivery systems (100, 200, 300, 400, 500) including a delivery device (130, 230, 330, 430, 530) having a catheter (132, 133, 232, 233, 332, 333, 432, 433, 532) and a stabilization device (150, 250, 350, 450, 550), the delivery device configured for delivering an apparatus to a left atrium (20) of a patient via the patient's vasculature. The stabilization device has a delivery position in which the stabilization device is collapsed against the catheter and a deployed position in which the stabilization device expands to engage and support the catheter within the vasculature, for example, within the vena cava (14) proximate the right atrium (16). In various embodiments, the delivery device functions as an introducer though which a second delivery device carrying the apparatus is inserted. Methods of accessing the left atrium with the delivery systems and devices are also disclosed.
摘要:
A catheter includes a wave guide for transmitting ultrasonic energy from a transducer, and which is also rotated to facilitate enhanced disruption of the concerned obstruction in a transverse direction. Embodiments of waveguide include distal anchors that help focus the energy transmitted to a treatment site, and may also include a deployable filter that may open distal of the obstruction to capture any dislodged debris. Selectively inflatable balloons may cordon off a treatment site, and the wave guide may comprise a tube that may serve the dual purposes of inflating the balloon(s), as well as to transmit ultrasonic energy to an obstruction. A portion of an ultrasonic catheter may include plural curved portions to space an exposed portion of the wave guide away from the catheter body to enhance the vibratory action provided.
摘要:
Methods, devices, and system for diverting fluid flow from a first vessel including an occlusion to a second vessel. A prosthesis is deployable at least partially in a fistula. Valves in the second vessel may be made incompetent, for example using a reverse valvulotome to cut the valves, inflating a balloon, expanding a stent, and lining the second vessel with a stent.
摘要:
Dynamic aspiration, such as in aspiration thrombectomy, provides a changing negative pressure in a catheter such that a dynamic suction force is exerted on a thrombus or occluding element. Various dynamic aspiration profiles may be used. Devices for providing dynamic aspiration may be used with existing catheter-pump systems which currently deliver only static aspiration. A dynamic suction force exerted on a thrombus may induce material fatigue and thereby reduce the clot's load-to-failure and time-to-failure as compared to existing suction thrombectomy techniques.
摘要:
A catheter device is disclosed for transvascular delivery of a medical device to a cardiac valve region of a patient. The catheter device comprises an elongate sheath (2) with releasable locking members for controllably locking the elongate sheath in a shape at least partly along its length from a relaxed state to a locked state when positioned in relation to a cardiac valve. Furthermore, alignment members (5) are provided to provide for a desired positioning in relation to the cardiac valve. Embolic protection (8) is further provided.
摘要:
An apparatus for applying a substance to internal mammalian tissue is provided. The apparatus includes a member having a flexible, absorbent, porous portion connected to a non-porous portion. The apparatus may be used to treat atrial fibrillation or other non-atrial fibrillation issues with internal mammalian tissue.
摘要:
The present invention provides a method and device for non-invasive anatomical and systemic cooling. The method and device provide for cooling of various bodily fluid- containing spaces or surfaces, such as mucus-containing spaces or surfaces via delivery of a dry fluid not including a coolant into or upon the mucus-containing space or surface. Exposure of such mucus to the dry fluid results in evaporation and cooling of the anatomical feature and/or systemic cooling, as intended. In this fashion, therapeutic hypothermia may be achieved to provide for neuroprotection of various organs after ischemic insult, such the brain after cardiac arrest.
摘要:
A lumen extension member (126) is provided for a catheter (100) having a catheter body (100) and an elongate electrode coupled to the catheter body (100). The elongate electrode defines an electrode lumen extending therethrough. The lumen extension member (126) is positioned within the electrode lumen and is coupled to the catheter body (100). The lumen extension member (126) includes a tubular member including a sidewall (134) and at least one opening (136) that extends through the sidewall (134).
摘要:
A valvuloplasty catheter has a dog-bone shaped balloon with semi-compliant smaller diameter waist and non-compliant larger diameter bulbous end regions. The balloon centers across the valve with the waist adjacent to the annulus. One bulbous region serves to hyperextend the valve leaflets and the other assists in stabilizing the balloon position to reduce migration. The semi-compliant waist increases in diameter as fluid enters the balloon until it comes into contact with the valve annulus. The pressure within the balloon per unit of volume delivery has a greater slope after contact with the annulus than before resulting in a change in slope for the pressure versus volume curve. The diameter of the balloon and annulus are determined at this inflection point when the balloon contacts the annulus.