FIELD OF INVENTION
The present invention generally relates to medical devices, and more particularly, to devices for intravascular plaque isolation, destabilization, aspiration, and removal.
BACKGROUND
Atherosclerosis results from lesions which narrow and reduce the space in the lumen of vessels in the vasculature. Such lesions are usually composed of plaque, which can be fat, cholesterol, calcium, or other components of the blood. Severe occlusion or closure can impede the flow of oxygenated blood to different organs and parts of the body and result in other cardiovascular disorders such as heart attack or stroke. Narrowing of vessels, or stenosis, increases the risk that clots, and other emboli can lodge at such locations, especially in the neurovascular where vessel diameters are already small. Intracranial atherosclerosis disease (ICAD) is the narrowing of those arteries and vessels supplying blood to the brain and represents the most common proximate mechanism of ischemic stroke.
These clogged blood vessels can lead to blockages that can cause strokes, or, for example, when these blockages break free from the wall of the blood vessel, they can cause a heart attack. These blockages can be treated with medications, stents, surgeries (e.g., bypass surgery), and/or other treatments including an angioplasty. Each of these treatments for blocked blood vessels have certain drawbacks. For example, medication(s) can have various side effects, a patient may be allergic to a stent and/or develop an infection from the stent, and surgeries can result in complications and may only temporarily remedy the issue.
Therefore, there is a need for improved methods, devices, and systems for isolating, destabilizing, aspirating, and removing plaque within blood vessels.
SUMMARY
It is an object of the present invention to provide systems, devices, and methods to meet the above-stated needs. Generally, it is an object of the present invention to provide a system for extracting plaque from a vasculature to meet the above-stated needs. The system can include a balloon guide catheter (“BGC”), an inner tube, and an adjustable plaque displacement apparatus. The BGC can include an expandable proximal balloon that is positioned approximate a BGC distal end. Further, the BGC can include an inflation lumen that extends through BGC, and a first opening approximate the expandable proximal balloon. Also, the BGC can include a delivery device delivery lumen that extends through the BGC, and a second opening that is positioned distal to the expandable proximal balloon. The inner tube can extend through the device delivery lumen, and the inner tube can include a tube distal end and an expandable distal occlusion element that is positioned proximate the tube distal end and that is movable to exit the second opening.
Turning to the adjustable plaque displacement apparatus, the adjustable plaque displacement apparatus can be positioned within the device delivery lumen. Further, the adjustable plaque displacement apparatus can be movable in a longitudinal direction and/or a rotational direction in relation to the BGC.
In some examples, the adjustable plaque displacement apparatus can increase in circumference as it moves in the longitudinal direction from a proximal position within the device delivery lumen and to a distal position distal to the second opening. Conversely, the adjustable plaque displacement apparatus can decrease in circumference as it moves in the longitudinal direction from the distal position to the proximal position.
In some examples, the balloon guide catheter can include an aspiration lumen.
According to some examples, the plaque displacement apparatus can include a needle and/or an expandable wire frame that is positioned over the inner tube.
In some examples, the balloon guide catheter can further include a flush lumen that extends through the balloon guide catheter and includes a third opening positioned distal to the proximal balloon.
In some examples, the plaque displacement apparatus can include an inflatable component.
In some examples, the plaque displacement apparatus can include an electronic component. The electrical component can apply a vibration that moves the plaque displacement apparatus longitudinally and/or rotationally to dislodge plaque.
According to some examples, the expandable distal occlusion element can be porous.
In some examples, the flush lumen can be configured to deliver saline, an anti-thrombogenic drug (ATD), and/or a plaque sealant.
An example method for displacing intravascular plaque can include one or more of the following steps presented in no particular order, and the method can include additional steps not included here. An intravascular system including a first vascular occlusion element, a second vascular occlusion element, a device delivery lumen, and a plaque displacement apparatus can be provided here. The first vascular occlusion element can be positioned in a distal direction in relation to an intravascular lesion. Next, the second vascular occlusion element can be positioned in a proximal direction in relation to the intravascular lesion. Also, an opening of the device delivery lumen can be positioned in the proximal direction in relation to the expanded first vascular occlusion element and in the distal direction in relation to the expanded second vascular occlusion element.
The first vascular occlusion element can be expanded by applying pressure to a first inflation lumen of the intravascular system. Similarly, the second vascular occlusion element can be expanded by applying pressure to a second inflation lumen of the intravascular system. Further, the plaque displacement apparatus can be positioned in the proximal direction in relation to the expanded first vascular occlusion element and in the distal direction in relation to the expanded second vascular occlusion element. Then, the plaque displacement apparatus can be moved against the intravascular lesion to displace plaque. Once displaced, the plaque can be aspirated through the opening of the device delivery lumen.
In some examples, an opening of a flush lumen of the intravascular system can be positioned in the proximal direction in relation to the expanded first vascular occlusion element and in the distal direction in relation to the expanded second vascular occlusion element. Then, a fluid can be injected through the opening of the flush lumen into a cavity defined by the vasculature, the expanded first vascular occlusion element, and the expanded second vascular occlusion element.
In some examples, the intravascular system can simultaneously inject the fluid through opening of the flush lumen and aspirate through the opening of the device delivery lumen.
According to some examples, moving the plaque displacement apparatus against the intravascular lesion can further involve: rotating the plaque displacement apparatus in relation to the expanded second vascular occlusion element and in relation to the expanded first vascular occlusion element; moving the plaque displacement apparatus in the distal direction and in the proximal direction in relation to the expanded second vascular occlusion element and in relation to the expanded first vascular occlusion element; and/or repeatedly expanding and contracting the plaque displacement apparatus.
In some examples, positioning the plaque displacement apparatus in the proximal direction in relation to the expanded first vascular occlusion element and in the distal direction in relation to the expanded second vascular occlusion element can further involve moving the plaque displacement apparatus through the opening of the device delivery lumen.
In some examples, the method can further include expanding the plaque displacement apparatus as the plaque displacement apparatus moves from the opening of the device delivery lumen to a position in the proximal direction in relation to the expanded first vascular occlusion element and in the distal direction in relation to the expanded second vascular occlusion element.
In some examples, a component of the plaque displacement apparatus can be inflatable.
In some examples, when the plaque displacement apparatus is moved against the intravascular lesion, it can puncture the intravascular lesion.
According to some examples, the method can further include inserting a stent across the intravascular lesion.
Another example method for displacing intravascular plaque can include one or more of the following steps presented in no particular order. The method can include additional steps not included here. Also, an intravascular system including a first vascular occlusion element, a second vascular occlusion element, a device delivery lumen, an inflation lumen, a flush lumen, a stent, and a plaque displacement apparatus can be provided here.
The method can include positioning a first vascular occlusion element in a distal direction in relation to the intravascular lesion. A second vascular occlusion element can be positioned in a proximal direction in relation to the intravascular lesion. Next, an opening of the device delivery lumen can be positioned in the proximal direction in relation to the expanded first vascular occlusion element and in the distal direction in relation to the expanded second vascular occlusion element. Then, the first vascular occlusion element can be expanded by applying pressure to the inflation lumen. Similarly, the second vascular occlusion element can be expanded by applying pressure to the inflation lumen. The method can further include positioning the plaque displacement apparatus in the proximal direction in relation to the expanded first vascular occlusion element and in the distal direction in relation to the expanded second vascular occlusion element. Next, the plaque displacement apparatus can be moved against the intravascular lesion, which displaces plaque. An opening of the flush lumen can be positioned in the proximal direction in relation to the expanded first vascular occlusion element and in the distal direction in relation to the expanded second vascular occlusion element. Then, a fluid can be injected through the opening of the flush lumen and into a cavity defined by the vasculature, the expanded first vascular occlusion element, and the expanded second vascular occlusion element. After injecting the fluid and displacing the plaque, the fluid and displaced plaque can be aspirated through an opening of the device delivery lumen. Further, the stent can be inserted across the intravascular lesion.
In some examples, moving the plaque displacement apparatus against the intravascular lesion can further involve: rotating the plaque displacement apparatus in relation to the expanded second vascular occlusion element and in relation to the expanded first vascular occlusion element; moving the plaque displacement apparatus in the distal direction and in the proximal direction in relation to the expanded second vascular occlusion element and in relation to the expanded first vascular occlusion element; and/or repeatedly expanding and contracting the plaque displacement apparatus.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and further aspects of this invention are further discussed with reference to the
following description in conjunction with the accompanying drawings, in which like numerals indicate like structural elements and features in various figures. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating principles of the invention. The figures depict one or more implementations of the inventive devices, by way of example only, not by way of limitation.
FIG. 1 is an illustration of an example intravascular system including an expandable frame for displacing plaque according to aspects of the present invention;
FIGS. 2A-2I illustrate an exemplary sequence of using the intravascular system illustrated in FIG. 1 in a plaque displacement method according to aspects of the present invention;
FIGS. 3A through 3E are illustrations of an example intravascular treatment system including an incision device and another example plaque displacement method according to aspects of the present invention;
FIG. 4A is an illustration of yet an example intravascular system including agitation veins for displacing plaque according to aspects of the present invention;
FIG. 4B is an illustration of a cross section of the intravascular system illustrated in FIG. 4A;
FIG. 5 is an illustration of yet an intravascular system including a balloon expandable structure for displacing plaque according to aspects of the present invention;
FIG. 6 is an illustration of a thrombectomy device and method step for using the thrombectomy device in conjunction with any of the example intravascular systems according to aspects of the present invention;
FIGS. 7A and 7B are illustrations of a stent and method steps for using the stent with any of the example intravascular systems according to aspects of the present invention;
FIG. 8 is an example flowchart of a method for displacing and aspirating intravascular plaque according to aspects of the present invention; and
FIG. 9 is an example flowchart of a method for displacing, aspirating, and flushing intravascular plaque according to aspects of the present invention.
DETAILED DESCRIPTION
Some examples presented herein can be used to aid in the displacement and removal of plaque within a vasculature. Some examples presented herein can be used to isolate a lesion during plaque displacement such that plaque located on a blood vessel wall can be displaced and removed from the vasculature while inhibit dislodged plaque fragments from migrating from the treatment site. To meet some or all of these needs, example systems can include an inner tube having a distal occlusion element that can be expanded in the distal direction in relation to the treatment site, a balloon guide catheter having a balloon thereon that can be expanded in the proximal direction in relation to the treatment site and a lumen through which the inner tube can traverse, and a plaque displacement apparatus that can mechanically displace plaque at the treatment site while the distal occlusion element and the proximal balloon are deployed.
FIG. 1 is an illustration of an intravascular system 100 for displacing plaque (P). As shown, the intravascular system 100 can include a guide wire 20, a balloon guide catheter (BGC) 105, an inner tube 121, and a plaque displacement apparatus 123. The BGC 105 can include a BGC distal end 111 and a proximal balloon 113 positioned approximate the BGC distal end 111. The balloon guide catheter 105 can further include the device delivery lumen 117 that extends through the balloon guide catheter 105 and that can be sized to allow the inner tube 121 to slide therethrough and sized to contain the plaque displacement apparatus 126 as the system 100 is delivered intravascularly to the lesion L.
The inner tube 121 can include the tube distal end 107 and the distal occlusion element 109, which can be positioned approximate the tube distal end 107. The distal occlusion element 109 can be collapsible to be contained within the device delivery lumen 117 and expandable to appose vasculature when moved distally out of the device delivery lumen 117.
When the system 100 is deployed as illustrated in FIG. 1, the plaque displacement apparatus 123 can move the longitudinal 10 and/or a rotational direction 30 in relation to the balloon guide catheter 105. The system 100 can include a positioning tube 126 attached to the plaque displacement apparatus 123 that can be manipulated to translate the plaque displacement apparatus 123 distally and proximally. In some examples, the positioning tube 126 can further rotate in a rotational direction 30 about the longitudinal axis 10 to cause the plaque displacement apparatus 123 to rotate. The tube 126 can be coaxial with the inner tube 121 and slidably translatable over the inner tube 121. The system 100 can include a collar 125 attached to the plaque displacement apparatus 123 that can slide freely over the inner tube 121. Position of the collar 125 can depend on the position of the tube 126 and the shape of the plaque displacement apparatus 123.
FIGS. 2A-2I illustrates the intravascular system 100 for displacing plaque at various stages of a treatment. The balloon guide catheter 105 can be used to insert the intravascular system 100 within the vasculature. In some treatments, the balloon guide catheter 105 can be inserted into the femoral artery to perform certain methods disclosed herein that can be performed with the intravascular system 100, 100A, 100B, and/or 100C. Using the guide wire 20, the intravascular system 100 can be threaded in the arterial system until a vasculature lesion L is reached. Once the lesion L is reached, the distal occlusion element 109 can be positioned in a distal direction 14 in relation to the vasculature lesion L. The proximal balloon 113 can be positioned a proximal direction 12 in relation to the intravascular lesion L.
FIG. 2A is indicative of the intravascular system 100 after insertion into the vasculature and prior to inflation of the proximal balloon 113 and expansion of the distal occlusion element 109. The distal occlusion element 109 can be inflatable, self-expandable, mechanically expandable, or otherwise expandable as understood by a person of ordinary skill in the art according to the teachings of the present disclosure. The system 100 can include additional components and structures not illustrated herein to facilitate expansion of the distal occlusion element 109. Such components and structures can include, but are not limited to, a sheath which can restrict the distal occlusion element 109 and be retracted proximally to allow the distal occlusion element 109 to expand, an inflation lumen to inflate a balloon of the distal occlusion element 109, or other such structure. Similarly, a self-expandable, mechanically expandable, or other expandable component can be used in place of the proximal balloon 113 as understood by a person of ordinary skill in the art according to the teachings of the present disclosure.
FIG. 2B illustrates the intravascular system 100 after inflation of the proximal balloon 113 and expansion of the distal occlusion element 109. At this point, due to the inflation of the proximal balloon 113 and the distal occlusion element 109, the cavity C can be isolated. In some examples, both the proximal balloon 113 and the distal occlusion element 109 can respectively form fluid impermeable seals within the blood vessel V effective to restrict blood flow within the cavity C.
FIG. 2C shows the intravascular system 100 with the plaque displacement apparatus 123 partially exposed from the device delivery lumen 117 as it begins moving in the distal direction 14 to exit the balloon guide catheter 105. The plaque displacement apparatus 123 can be inhibited from expanding when positioned in the device delivery lumen 117 and expand as it exits the device delivery lumen 117. The collar 125 can slide freely over the inner tube 121 as the plaque displacement apparatus 123 expands.
FIG. 2D shows the adjustable plaque displacement apparatus 123 can increase in circumference as it moves in the longitudinal direction 10 from a proximal position within the device delivery lumen 117 and to a distal position distal to the distal end 111 of the BGC 105. Also shown in FIG. 2D, when expanded in circumference, the plaque displacement apparatus 123 can contact the plaque P within the walls of the blood vessel, such that portions (fragments) F of plaque become displaced.
FIG. 2E shows the portions F of plaque after becoming displaced. The portions F of plaque can be aspirated into the BGC 105. Preferably, the device delivery lumen 117 and delivery tube 126 are sized and/or otherwise configured to allow portions F of dislodged plaque to be aspirated into the device delivery lumen 117 as the plaque displacement apparatus 123 is moved against the plaque P at the lesion L. Alternatively, the system 100 can include a lumen not illustrated to aspirate the dislodged portions F. For instance, the BGC 105 can include an additional lumen, the inner tube 121 can include an aspiration lumen, and/or the delivery tube 126 can include an aspiration lumen.
In some treatments, fluid can be injected into the cavity C through the flush lumen 119 during aspiration. In examples where both the proximal balloon 113 and the distal occlusion element 109 are effective to arrest blood flow through the vessel V, injective fluid into the cavity C through the flush lumen 119 can reduce the likelihood that vessel V collapses in the vicinity of the cavity C due to negative pressure created by suction from aspiration. Also, fluid (e.g., saline, an anti-thrombogenic drug, a plaque sealant, etc.) can be injected into the cavity through the flush lumen 119. In some examples, this can occur simultaneously with the aspiration of the portions of plaque.
FIG. 2F depicts a cross-sectional view of the intravascular system 100 at a position in the distal direction in relation to the distal end 111 of the BGC 105 and looking in the proximal direction 12 as indicated in FIG. 2E. At the outermost portion of FIG. 2F is the vasculature V with the inflated proximal balloon 113 inflated to appose walls of the blood vessel V. FIG. 2F displays the balloon guide catheter 105 at its distal end 111, a cross section of the delivery tube 126 positioned within the device delivery lumen 117 of the BGC 105, a cross sectional view of the inner tube 121 positioned with the delivery tube 126, and a cross sectional view of the guide wire 20 positioned within the inner tube 121.
In this view, the opening 118 of the device delivery lumen 117 is visible. The delivery tube 126, inner tube 121, and guide wire 20 are slidably translatable to enter and exit the lumen 117 via the opening 118.
In this view, an opening 120 of the flush lumen 119 is visible at the distal end 111 of the BGC 105.
FIG. 2G depicts a cross-sectional view of the balloon guide catheter 105 as a cross section through the proximal balloon 113 and looking in the proximal direction 12 as indicated in FIG. 2E. From this vantage point, an opening 116 to an inflation lumen 115 through the BGC 105 is illustrated. The inflation lumen 115 is configured to provide fluid to the proximal balloon 113 to inflate and deflate the proximal balloon 113.
FIG. 2H illustrates the intravascular system 100 with the plaque displacement apparatus extended in the longitudinal direction 10 proximate the tube distal end 107 and the intravascular system 100. The plaque displacement apparatus 123 can be moved in the distal direction 14 and in the proximal direction 12 in relation to the proximal balloon 113 and in relation to the distal occlusion element 109. As shown, the plaque displacement apparatus 123 has longitudinally traversed the plaque along the walls of the vessel V. Traversal of plaque displacement apparatus 123 across the lesion L can be effective to dislodge some or all of the plaque P. In some examples, the plaque displacement apparatus 123 can move rotationally in the rotational direction 30 to agitate the plaque P. In some examples the plaque displacement apparatus 123 can include a structure or component to cause the plaque displacement apparatus to repeatedly expand and contract to make contact and/or puncture the plaque along the blood vessel wall, such that portions of the plaque are freed.
FIG. 2I depicts the plaque displacement apparatus 123 can retract in the proximal direction 12 toward the BGC 105. The plaque displacement apparatus 123 can contract to be contained by the device delivery lumen 117 as it is retracted in the proximal direction.
FIG. 3A illustrates another example intravascular system 100A for displacing plaque. Similar to the intravascular system 100 illustrated in FIGS. 1 and 2A through 2I, the intravascular system 100A can include the guide wire 20, the balloon guide catheter 105 with the proximal balloon 113 thereon and an inner tube 121A having the distal occlusion element 109 thereon. The inner tube 121A illustrated in FIG. 3A differs from the inner tube 121 illustrated in FIGS. 1 and 2A through 2I in that the inner tube 121A includes an opening 131 sized to allow a plaque displacement element to pass therethrough. The system 100A can be delivered to the position illustrated in FIG. 3A by similar methods as the system 100 illustrated in FIGS. 1 and 2A through 2I, particularly by methods described in relation to FIG. 2A.
FIG. 3B shows a cross-sectional view of the inner tube 121A of the inflated intravascular system 100A at a position which passes through the opening 131 on the inner tube 121A and looking in the proximal direction 12 as indicated in FIG. 3A. The system 100A can include an incision tool 123A positioned within the inner tube 121A and movable to exit the opening 131 in the inner tube 121A. Plaque P is illustrated circumferentially attached to walls of the vessel V.
FIG. 3C shows a cross-sectional view of the BGC 105 through the proximal balloon 113 and looking in the proximal direction as indicated in FIG. 3A. The proximal balloon 113 is deflated. The incision tool 123A is illustrated in cross section. The incision device can include an elongated structure that is movable in the proximal and distal direction in relation to the inner tube 121A.
FIG. 3D shows the proximal balloon 113 and distal occlusion element 109 expanded and the incision tool 123A moved to engage the plaque P. The incision tool 123A can be used to puncture and/or cut the lesion L. In some examples, the inner tube 121A can include a rotating joint positioned near the distal occlusion element 109 and/or between the opening 131 and the distal occlusion element 109 so that a proximal portion of the inner tube including the opening 131 can be rotated in the rotational direction 30 as indicated in FIG. 3D. The incision tool 123A can be moved against the plaque P, in the rotational direction, as the opening 131 is rotated.
FIG. 3E shows aspiration of cavity C through the BGC 105 and/or inner tube 121A. During aspiration, fluid can be provided through the flush lumen. In some treatments, fluid such as saline solution or a drug can be flowed into the cavity C through the flush lumen 119 while aspirating. Rate of aspiration and fluid flow can be regulated to control pressure within the cavity C.
FIGS. 4A and 4B shows another example intravascular system 100B that can be used to displace, flush, and/or aspirate plaque. FIG. 4B is a cross-sectional view of the system 100B as indicated in FIG. 4A. The system 100B can include a balloon guide catheter such as the BGC 105 illustrated in the previous figures. The system 100B can include an inner tube 121 such the inner tube 121 illustrated in FIGS. 1 and 2A through 2I. Alternatively, the inner tube 121 can include an incision tool 123A and inner tube 121A as illustrated in FIGS. 3A through 3E. The system 100B can include agitation veins 123B that, when placed against the plaque, can cause portions of the plaque to become displaced. The agitation veins 123B can be collapsed within the device delivery lumen 117 during delivery of the system 100 to the lesion L. The agitation veins 123B can extend radially such that the veins 123B encompass the width of the cavity upon movement of the veins 123B out of the device delivery lumen 117. The system 100B can include a delivery tube 126 similar to the delivery tube 126 illustrated in FIGS. 1 and 2A through 2I. The veins can be affixed directly to the delivery tube 126. The delivery tube 126 can be manipulated to move the plaque displacement apparatus 123b distally and proximally through the cavity C. In some examples, the delivery tube 126 can be rotatable in the rotational direction 30 to rotate the plaque displacement apparatus 123B. The cavity C can be aspirated while the displacement apparatus 123B is moved to displace plaque P as described elsewhere herein.
FIG. 5 shows another example intravascular system 100C that can be used to displace, flush, and/or aspirate plaque. The system 100C can include a balloon guide catheter such as the BGC 105 illustrated in the previous figures. The system 100C can include an inner tube 121 such the inner tube 121 illustrated in FIGS. 1 and 2A through 2I. Alternatively, the inner tube 121 can include an incision tool 123A and inner tube 121A as illustrated in FIGS. 3A through 3E. The system 100C can include a plaque displacement tool 123C can be inflatable and can have ridges 133 and/or barbs 135 that are positioned to expand into the plaque P when the displacement tool 123C is inflated. The displacement tool 123C can be deflated and collapsed within the device delivery lumen 117 when the system 100C is delivered to the treatment site. When the ridges 133 or barbs 135 are placed against the plaque, this can cause portions of the plaque to become displaced. The system 100C can include a delivery tube 126 similar to the delivery tube 126 illustrated in FIGS. 1 and 2A through 2I. The veins can be affixed directly to the delivery tube 126. The delivery tube 126 can be manipulated to move the plaque displacement apparatus 123C distally and proximally through the cavity C. In some examples, the delivery tube 126 can be rotatable in the rotational direction 30 to rotate the plaque displacement apparatus 123C. The cavity C can be aspirated while the displacement apparatus 123C is moved to displace plaque P as described elsewhere herein.
FIG. 6 is an illustration of a thrombectomy device 142 including an expandable frame which can engage and pull a clot. Methods for treatment using any of the example systems 100, 100A, 100B, 100C can further include a step whereby the thrombectomy device 142 is used to extract clot material or plaque P. The thrombectomy device 142 can be delivered within a microcatheter 140 through the device delivery lumen 117 or another lumen of the BGC 105 as illustrated. Additionally, the thrombectomy device can be delivered through a lumen of the inner tube 121, 121A of any of the example systems 100, 100A, 100B, 100C. Delivery of the thrombectomy device 142 through the inner tube 121, 121A does not preclude performance of the thrombectomy as illustrated in FIG. 6.
The thrombectomy can be perform by methods known to a person of ordinary skill in the art. Generally, a thrombectomy can be performed as follows. The microcatheter 140 with the thrombectomy device 142 therein can be placed across a clot, likely crossing the lesion L in the process. The microcatheter 140 can be retracted in the proximal direction 12 to deploy the thrombectomy device 142. The expanded thrombectomy device 142 with clot material therein can be extracted from the vessel V.
A thrombectomy can be performed before, after, and/or between other treatment steps illustrated herein as apparent to a person skilled in the pertinent art. In some treatments, a clot may become lodged in the distal direction 14 in relation to the lesion L. In such cases, when the inner tube 121, 121A includes a lumen sized to allow the microcatheter 140 and thrombectomy device to traverse therethrough, the lesion L can be isolated by expanded proximal and distal occlusion elements, and the lesion L can remain isolated while the thrombectomy device 142 is delivered out the distal end of the inner tube 121 to the clot.
FIGS. 7A and 7B are illustrations of a stent 146 being expanded by a balloon 144 into the lesion L. Methods for treatment using any of the example systems 100, 100A, 100B, 100C can further include a step whereby the stent 146 is implanted into the lesion L. The stent 146 and balloon 144 can be delivered within a microcatheter 400 through the device delivery lumen 117 or another lumen of the BGC 105.
FIGS. 8 and 9 respectively depict example flowcharts of methods 800, 900 for displacing intravascular plaque. Each method 800, 900 can be performed, for example, by a healthcare professional using any of the intravascular systems 100, 100A-C, as disclosed herein, a variation thereof, or an alternative thereto as would be appreciated and understood by a person of ordinary skill in the art. Each method 800, 900 can respectively include one or more of the following steps presented in no particular order. Each method 800, 900 can include additional steps as would be appreciated and understood by a person of ordinary skill in the art.
Referring to the method 800 illustrated in FIG. 8, at step 805, a first vascular occlusion element (e.g., the distal occlusion element 109) of an intravascular system can be positioned in a distal direction in relation to an intravascular lesion. At step 810, a second vascular occlusion element (e.g., the proximal balloon 113) of the intravascular system can be positioned in a proximal direction in relation to the intravascular lesion. At step 815, an opening of the device delivery lumen of the intravascular system can be positioned in the proximal direction in relation to the first vascular occlusion element and in the distal direction in relation to the expanded second vascular occlusion element. Once the intravascular system is properly inserted in the intravascular lesion, steps 820 and 825 can be used to expand the first vascular occlusion element and the second vascular occlusion element, respectively. The first and second vascular occlusion element can each respectively be self-expandable, mechanical expandable, inflatable, or otherwise expandable by methods known to a person of ordinary skill in the art according to the teachings herein. In some examples, the first and/or second occlusion element can be expanded by applying pressure to the inflation lumen of the intravascular system. can also serve as an anchoring point to support distal advancement of the collapsed distal expanding element.
After the first and second vascular occlusion elements are expanded, blood flow in the intravascular lesion can be restricted. Plaque within the vasculature to be displaced and removed. At step 830, a plaque displacement apparatus can be positioned in the proximal direction in relation to the expanded first vascular occlusion element and in the distal direction in relation to the expanded second vascular occlusion element. Then, at step 835, the plaque displacement apparatus can be moved against the intravascular lesion causing plaque to be displaced. At step 840, the displaced plaque can then be aspirated. In some examples, the displaced plaque can be aspirated through the opening of the device delivery lumen.
FIG. 9 illustrates an example flowchart of method 900 for displacing, aspirating, and flushing intravascular plaque. At step 905, the first vascular occlusion element of the intravascular system can be positioned in the distal direction in relation to the intravascular lesion. At step 910, the second vascular occlusion element of the intravascular system can be positioned in the proximal direction in relation to the intravascular lesion. Then, at step 915, an opening of a device delivery lumen of the intravascular system can be positioned in the proximal direction in relation to the first vascular occlusion element and in the distal direction in relation to the second vascular occlusion element. Steps 920 and 925 can be performed to restrict blood flow in the vasculature (e.g., the area near the intravascular lesion). At step 920, the first vascular occlusion element can be expanded. At step 925, the second vascular occlusion element can be expanded. The first and second vascular occlusion element can each respectively be self-expandable, mechanical expandable, inflatable, or otherwise expandable by methods known to a person of ordinary skill in the art according to the teachings herein. In some examples, the first and/or second occlusion element can be expanded by applying pressure to the inflation lumen of the intravascular system.
At step 930, a plaque displacement apparatus of the intravascular system can be positioned in the proximal direction in relation to the expanded first vascular occlusion element and in the distal direction in relation to the expanded second vascular occlusion element. At step 935, the plaque displacement apparatus can be moved against the intravascular lesion to displace plaque. At step 940, an opening of the flush lumen of the intravascular system can be positioned in the proximal direction in relation to the expanded first vascular occlusion element and in the distal direction in relation to the expanded second vascular occlusion element. At step 945, a cavity of the vasculature can be flushed by injecting fluid (e.g., saline, an anti-thrombogenic drug, or a plaque sealant) through the opening of the flush lumen and into the cavity. At step 950, the displaced plaque and the fluid can be aspirated. In some examples the displaced plaque can be aspirated through an opening of a device delivery lumen. Further, at step 955, a stent can be implanted across the intravascular lesion.
The descriptions contained herein are examples of embodiments of the invention and are not intended in any way to limit the scope of the invention. As described herein, the invention contemplates many variations and modifications of the intravascular treatment system, including alternative materials, alternative device structures, alternative treatment steps, etc. Modifications apparent to those having ordinary skill in the art to which this invention relates and are intended to be within the scope of the claims which follow.
Patent Application
20210402157
