Temporary bypass balloon catheter

Abstract

A balloon catheter for treating aneurysms or other intraluminal target sites, having at least one bypass window through which blood flows temporarily and out at least one end hole, and a balloon mounted near the end hole, such that there is no need for repeated inflation/-deflation cycles. The invention has an elongated tube, a balloon disposed between the most distal said window and said end hole, and at least two channels. A first channel passes from the proximal end of said tube to the bypass window to allow blood to flow into said window and out said end hole, and a second channel passing from the proximal end of said tube to said balloon to allow inflation material to enter said balloon.

In optional embodiments, a micro-catheter may pass through to treat a target site; the inner tube and balloon may be branched to facilitate treatment at a vascular branch, such as for a wide-neck aneurysm by balloon tamponade, a micro-catheter extension or other device passing through a bifurcation hole at the branch point.

Claims

1. A catheter comprising: an elongated tube, at least one bypass window, at least one end hole, a balloon disposed between the most distal said window and said end hole, and at least two channels, wherein a first channel passes from the proximal end of said tube to said window to allow blood to flow into said window and out said end hole, and a second channel passing from the proximal end of said tube to said balloon to allow inflation material to enter said balloon.

2. The catheter of claim 1, further comprising: a micro-catheter which enters the proximal end of said tube, passes through one of said bypass windows, and extends into a vascular target proximal to said balloon.

3. The catheter of claim 2, wherein said micro-catheter travels parallel to said at least one bypass window, through said balloon and exiting said end hole.

4. The catheter of claim 1, further comprising a bifurcation near the distal end of said tube, a second end hole, a branch in said balloon adapted to vascular branch-point inflation: a micro-catheter which enters the proximal end of said tube, passes through one of said bypass windows, and extends into a vascular target.

5. The catheter of claim 4, further comprising: a bifurcation hole in tube for said micro-catheter to pass through.

6. The catheter of claim 5, further comprising: a micro-catheter extension exiting said balloon via said bifurcation hole.

Description

DETAILED DESCRIPTION OF THE DRAWINGS

[0021] FIG. 1 is a perspective view of the catheter of the current invention disposed within a lumen across an aneurysm.

[0022] FIG. 2 is a perspective view of the catheter of the current invention having a branched balloon disposed within a lumen across a wide-neck aneurysm at the vascular branching point.

[0023] FIG. 3 depicts a perspective view of the embodiment of FIG. 2, further including a bifurcation hole disposed across a vessel branching point for a micro-catheter extension to pass through a branched balloon.

[0024] FIG. 4 is a perspective view of the proximal end of the catheter of the current invention, depicting an interior tube.

[0025] FIG. 4A is a perspective view of the proximal end of an alternative catheter of the current invention, depicting an embedded lumen within the catheter wall.

[0026] FIG. 5 is a cutaway view of the interior of the balloon element disposed on the distal end of the catheter proximal to the aneurysm/pathology to be treated.

[0027] FIG. 6 is a view of the device of FIG. 2 before and after deployment within a vessel.

DETAILED DESCRIPTION OF THE INVENTION

[0028] The present invention is composed of a catheter 10 with a distal end hole 50, at least one bypass window 20 proximal to said end hole 50 and a balloon 60 element between said end hole 50 and said bypass window 20. The present invention is capable of deploying said balloon 60 element across the neck of a target aneurysm (shown depending in cutaway profile) while simultaneously positioning said bypass windows 20 proximally of said target aneurysm so as to allow a micro-catheter 30 to be pushed from the proximal end of said catheter 10, through said bypass window 20, around said balloon 60 and into said target aneurysm. Said micro-catheter 30, once deployed, is capable of delivering material into said target aneurysm.

[0029] Referring now to FIG. 1, the preferred embodiment is composed of a balloon 60 mounted to a catheter 10 similar to a Merci/Concentric/Stryker Flowgate Balloon Guide Catheter. The present invention differs from the Merci/Concentric/Stryker Flowgate Balloon Guide Catheter in that it could not be a stiff guide. The present invention must be sufficiently flexible so as to be deliverable to distal brain anatomy. In this respect the present invention would incorporate elements of the penumbra Ace 060 5Max and 068 5Max Ace catheters, and the MicroVention Sofia catheters, but with a balloon 60 across the distal tip 50 region like the Flowgate, and bypass window(s) proximal to the balloon that allow inflow of blood flow for bypass during balloon inflations.

[0030] The present invention differs from all prior art due to the incorporation of at least one window element 20 in the catheter just proximal to a deployed balloon 60 element. Said window 20 may be a segment of the present invention's catheter 10 that is composed of two or more struts 22 resulting in one or more window(s) 20.

[0031] The present invention adds value to a surgeon because said surgeon can advance the balloon 60 across the neck of an aneurysm or across a bleeding site, then inflate the balloon 60. The balloon 60 tamponades the bleeding and/or allows delivery of coils with balloon 60 remodeling and/or allows contained delivery of liquid embolic (Onyx 500) and/or other intrasaccular treatment such as coils, hydrogel, or other intrasaccular therapy, and the balloon 60 does not have to be periodically deflated to allow distal brain perfusion. Instead the windows 20 in the catheter 10 proximal to the balloon 60 allow continuous flow of blood during inflation. The blood just flows into the windows 20, through the distal catheter 10 (the segment that has the balloon mounted to it), and out the distal tip 50 of the catheter.

[0032] Referring now to FIG. 4, the catheter comprises a flexible external tubular wall 101 and an inner tube 140. Blood flows through the interior 130 of tube 140 to distal tip 50. A tubular lumen 120 starts at the proximal end of catheter 10 continuously through the proximal end of strut 22. Lumen 120 is capable of carrying material to inflate balloon 60. Flexible internal tubular wall 140 also starts at the proximal end of catheter 10 continuously through the proximal end of strut 22. Interior lumen 130 allows passage of a micro-catheter (not shown) to pass therethrough to the target aneurysm. Interior lumen 130 starts at the proximal end of catheter 10 continuously through the proximal end of strut 22.

[0033] Referring to FIG. 4A, in an alternate embodiment wherein said catheter 10 is composed of a tubular structure 140 having an embedded lumen 150. Embedded lumen 150 allows passage of a micro-catheter (not shown) to pass therethrough to the target aneurysm. Interior lumen 150 starts at the proximal end of catheter 10 continuously through the proximal end of strut 22.

[0034] In the embodiment of the current invention having a single window 20 bypass, channel 120 or embedded lumen 150 pass directly into balloon 60 element. In an alternate embodiment, additional lumens similar to embedded lumen 150 can be added. The additional lumen can be used for micro-catheters when the joint use of embedded lumen 150 for both balloon 60 inflations and deflations, and passage of a micro-catheter is not desirable.

[0035] In the preferred embodiment having a multiple windows 20 are connected by at least one hollow strut 22. In this embodiment, channel 120 or embedded lumen 150 connect through hollow strut 22 to allow flow of inflating material into balloon 60 element. In an alternate embodiment, at least a second window 20 is connected by at least one hollow strut 22. In this embodiment, channel 120 or embedded lumen 150 connect through hollow strut 22 to allow flow of inflating material into balloon 60 element.

[0036] Referring to FIG. 5, in the preferred embodiment, flexible tube balloon 60 element is disposed upon flexible tube 240. Within tube 240 is embedded lumen 250 corresponding with embedded lumen 150 to transport the inflating material. Embedded lumen 250 terminates at inflation/deflation nozzle 255. Nozzle 255 protrudes into inflation bladder 300 within the exterior wall 360 of balloon 60.

[0037] Referring now to FIG. 2, in some versions the catheter can also bifurcate or trifurcate (or more branches) after the window(s) 20, with a branched balloon 600 crossing the vascular branch point(s), to allow treatments of branch point aneurysms as well (with distal catheter lumen ending in all major branches). In this embodiment, the catheter 10 is bifurcated at branching point having at least one more end hole 500 for blood to flow around the target wide-neck aneurysm. A branched balloon 600 adapted for positioning within a vascular branching point is disposed near the distal end of said catheter 10.

[0038] Referring now to FIG. 3, in another embodiment adapted to vascular branch-point treatment, incorporating all elements noted in FIG. 2, but having two additional elements. The first additional element is a bifurcation hole 900 disposed at the branch point of said branched balloon 600 to allow a micro-catheter to pass through said bifurcation hole 900 to treat a wide-neck aneurysm at the vascular branch point directly. The second optional, additional element is micro-catheter extension 3000. Micro-catheter extension 3000 allows faster and easier placement of micro-catheter 30 when a target aneurysm requires.

[0039] Additionally, the catheter element of the current invention can even be used simultaneously to access the aneurysm with another micro-catheter 30with micro-catheter 30 going through the proximal end of catheter 10, then exiting the catheter 10 at a bypass window 20 to access the aneurysm/pathology.

[0040] The micro-catheter 30 is advanced over a microwire (not shown), which is soft and steerable. The operator has to steer the microwire in the correct direction. The micro-catheter 10 can be advanced and positioned when the balloon 60 is deflated. Then the microwire can be removed and the balloon 60 can be inflated.

[0041] In some non-limiting iterations of the bifurcation/branch point design a treatment micro-catheter with a single or dual lumen can be incorporated into the current device, coming out at the branch point(s). This iteration of the current invention will allow surgeons to ameliorate the adverse affects of targeted aneurysm more quickly, more accurately and at less cost than alternatives taught by prior art.

[0042] In some embodiments of the present invention, such as the bifurcated end hole of FIGS. 2, 3 and 6, there may be additional, separate elements that extend from the proximal hole of catheter 10 across the bypass window 20 ending at the branched balloon 600, thus resulting in at least two lumens. In the branched balloon 600 embodiment, an example of such an inner element includes a dual lumen dilation/introducer designed to line up with and marry to the two arms of the branched balloon 600 such that the branched balloon 600 may be introduced through a vessel over two separate wires. This embodiment would also incorporate separate holes within branched balloon 600 to allow wires passing through catheter 10 to guide each branch of branched balloon 600 into proper position. Additionally, in an alternative embodiment, the micro-catheter extension element 3000 is embedded into the device and can be steered over an independent wire into the target aneurysm.

[0043] In other non-limiting iterations of the present invention, various elements of the present invention can taper before the bypass windows too, to allow more flow into the windows 20. For example the segment with balloon 60 can be bigger again than the smaller tapered down size, among other. For added support and stability some embodiments may have additional struts 22 and windows 20 distal to the balloon 60 as well to allow the blood flow back into the vessel, with continuing catheter 10 beyond that, that in many embodiments may taper to a smaller catheter size. Thus, the balloon 60 is stabilized more and less likely to have its position dislodged by blood flow.

[0044] Although the invention has been described in detail in the foregoing embodiments for the purpose of illustration, it is to be understood that such detail is solely for that purpose, and that variations can be made therein by those skilled in the art without departing from the spirit and scope of the invention, except as it may be described by the following claims.