Aspiration method
DCFirst Claim
1. A method of treatment of a blood vessel in which blood fluid flows proximally to distally, said method comprising:
- delivering a guidewire having a proximal end and a distal end and an expandable device thereon into the blood vessel, said expandable device being actuatable between a nonexpanded state and an expanded state, said expandable device when in said expanded state forming a barrier sufficient to inhibit emboli suspended in said fluid from migrating past the barrier in a proximal to distal direction;
preventing emboli from moving in a distal to proximal direction by exposing said expandable device to blood fluid pressure within said vessel;
advancing a catheter having a lumen in fluid communication with a distal opening in the catheter, said advancing comprising moving said distal opening relative to said expandable device within the blood vessel such that said opening is distal to at least a portion of an occlusive substance within said blood vessel, said occlusive substance comprising said emboli suspended in said fluid; and
drawing fluid from the vessel into the distal opening such that (a) a fluid flow is created in the lumen in a distal to proximal direction, and (b) said fluid flow is simultaneously created in said vessel in a proximal to distal direction, whereby said emboli are carried by said fluid flow from said vessel into said distal opening and through said lumen of said catheter.
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Abstract
A method for the treatment of a stenosis or an occlusion in a blood vessel in which an occlusive device is first delivered and activated at a site distal to the occlusion to at least partially occlude the vessel. A therapy catheter is then introduced to treat the occlusion and a debris removal device is delivered to aspirate debris from the vessel. The present invention eliminates the need for a separate irrigation catheter and irrigation fluid which allows the procedure to be performed quickly and efficiently, and is especially useful in the removal of occlusion from saphenous vein graft, the coronary and carotid arteries, arteries above the aortic arch and vessels of similar size and pressure.
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Citations
68 Claims
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1. A method of treatment of a blood vessel in which blood fluid flows proximally to distally, said method comprising:
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delivering a guidewire having a proximal end and a distal end and an expandable device thereon into the blood vessel, said expandable device being actuatable between a nonexpanded state and an expanded state, said expandable device when in said expanded state forming a barrier sufficient to inhibit emboli suspended in said fluid from migrating past the barrier in a proximal to distal direction;
preventing emboli from moving in a distal to proximal direction by exposing said expandable device to blood fluid pressure within said vessel;
advancing a catheter having a lumen in fluid communication with a distal opening in the catheter, said advancing comprising moving said distal opening relative to said expandable device within the blood vessel such that said opening is distal to at least a portion of an occlusive substance within said blood vessel, said occlusive substance comprising said emboli suspended in said fluid; and
drawing fluid from the vessel into the distal opening such that (a) a fluid flow is created in the lumen in a distal to proximal direction, and (b) said fluid flow is simultaneously created in said vessel in a proximal to distal direction, whereby said emboli are carried by said fluid flow from said vessel into said distal opening and through said lumen of said catheter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for the evacuation of emboli from a blood vessel comprising:
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positioning an expandable device distal to a location in the vessel having an occlusion on the walls of said vessel;
positioning a catheter having a lumen in fluid communication with a distal opening in the catheter such that said opening is distal to said location;
drawing fluid from the vessel into the distal opening such that emboli broken off from said occlusion are carried by said fluid from said vessel into said distal opening and through said lumen of said catheter; and
moving the distal opening in the catheter until it is proximal to said location during the drawing of fluid into the distal opening. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for the treatment of an occlusion in a blood vessel having a fluid pressure of at least 0.2 psi, comprising:
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inserting a guidewire having an occlusive device at its distal end into said blood vessel, until said occlusive device is distal to said occlusion;
activating said occlusive device to at least partially occlude said vessel distal to said occlusion and create a working area around said occlusion;
advancing a therapy catheter into said blood vessel until it reaches said occlusion;
performing therapy on said occlusion;
utilizing fluid pressure within said vessel to inhibit particles produced during therapy from substantial migration in a direction proximal to said occlusion;
removing said therapy catheter;
delivering an aspiration catheter having a proximal end and a distal end over said guidewire until the distal end of said aspiration catheter is at a location proximal to the occlusive device and distal to the occlusion;
creating a flow of fluid within said vessel in a proximal to distal direction by aspirating fluid from said working area inside the vessel through said distal end of said aspiration catheter, whereby said particles are removed from the working area and said fluid pressure provides fluid to replace fluid aspirated from the working area; and
deactivating said occlusive device and removing said catheter. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A method of treatment of a blood vessel in which blood flows proximally to distally at a location having an occlusion on the walls of said vessel that constricts said vessel, said method comprising:
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delivering a guidewire having a proximal end and a distal end and an expandable device thereon into the blood vessel, said expandable device being actuatable between a nonexpanded state and an expanded state, said expandable device when in said expanded state forming a barrier sufficient to inhibit emboli in said blood from migrating past the barrier in a proximal to distal direction;
preventing emboli from moving in a distal to proximal direction by exposing said expandable device to blood flowing in a proximal to distal direction;
advancing a catheter having a lumen in fluid communication with a distal opening in the catheter, said advancing comprising moving said distal opening relative to said expandable device within the blood vessel such that said opening is distal to said occlusion within said blood vessel; and
drawing blood from the vessel into the distal opening such that (a) a blood flow is created in the lumen in a distal to proximal direction, and (b) said blood flow is simultaneously created in said vessel in a proximal to distal direction, whereby said emboli are carried by said blood flow from said vessel into said distal opening and through said lumen of said catheter. - View Dependent Claims (41, 42, 43, 44, 45, 46)
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47. A method for the evacuation of emboli from a blood vessel in which therapy has been performed on a lesion in the vessel, comprising:
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positioning a catheter having a lumen in fluid communication with a distal opening in the catheter such that said opening is in the region of said emboli;
drawing fluid from the vessel into the distal opening such that emboli are carried by said fluid flow from said vessel into said distal opening and through said lumen of said catheter; and
moving the distal opening in the catheter relative to said lesion while continuing to draw fluid into the distal opening. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54, 55, 56)
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57. A method for the evacuation of emboli from a blood vessel comprising:
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delivering a guidewire carrying an expandable device near its distal end to a location in the vessel having an occlusion on the walls of the vessel;
actuating said expandable device to inhibit emboli in said blood vessel from migrating past said expandable device;
positioning a catheter having a lumen in fluid communication with a distal opening in the catheter over said guidewire such that said opening is proximal to said expandable device;
drawing fluid from the vessel into the distal opening such that emboli are carried by said fluid from said vessel into said distal opening and through said lumen of said catheter, and moving the distal opening of the catheter during the drawing of fluid into the distal opening in a direction such that the distal opening crosses at least a portion of the occlusion. - View Dependent Claims (58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68)
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Specification