1. The Field of the Invention
The present invention relates in general to systems for anchoring medical devices in body lumens, or body cavities. In particular, the present invention relates to systems for anchoring catheters in body lumens, which may include blood vessels.
2. The Relevant Technology
Various medical procedures require the anchoring of a medical device within a body lumen. All of these systems need to be designed so that the device can be removed at the end of the procedure without causing unacceptable amounts tissue damage. For example, in the case of a catheter anchored in a blood vessel, the catheter must be easily inserted through an opening in the side of the vessel yet also be easily anchored when positioned at its desired location in the vessel.
A variety of systems have been designed to anchor a catheter passing into a body lumen through an opening in the side of the body lumen. Most commonly, an inflatable balloon is mounted on the catheter. After the catheter has been positioned at a desired location, the balloon is inflated. The balloon thereby pushes against the walls of the body lumen adjacent to the side opening when the catheter is pulled back, thus holding the catheter in position. Unfortunately, a problem with using such an inflatable balloon is that it typically blocks fluid flow through the lumen, which may not be desirable. Also, in addition to inhibiting fluid circulation, the balloon may interfere with drug delivery systems in the catheter.
What is instead desired is a simple system for securing a medical device such as a catheter in a body lumen. Such a system would preferably not interfere with fluid flow through the body lumen (such as blocking fluid flow with an inflatable balloon). In addition, such an anchoring system would preferably be easily removable at the end of the medical procedure.
The present invention provides a versatile system for securing a medical device (such as a catheter) at preferred locations within a body lumen (such as a blood vessel) without blocking or substantially inhibiting fluid flow through the lumen.
In preferred embodiments, the present invention includes a sheath having a plurality of side openings; a rotatable element disposed within the sheath; and a plurality of curved projections extending from the rotatable element, wherein rotation of the rotatable element with respect to the sheath pushes distal ends of each of the curved projections outwardly through one of the plurality of openings. In preferred methods of use, the plurality of curved projections are extended outwardly from the rotatable element and are then used to brace against the tissue surrounding a side hole opening into the vessel. Thus, when the device is deployed within the body lumen, and then pulled back (ie: proximally), the curved projections contact the tissue surrounding the side opening into the vessel, thereby preventing the device from being removed. The deployed projections may also provide needle receiving locations in the case of a suturing device, such as a device for suturing an arteriotomy.
The present invention also includes an embodiment including a sheath having only one side opening with one curved projection extending from the rotatable element. Similar to the above design, rotation of the rotatable element with respect to the sheath pushes the distal end of the curved projection outwardly through the side opening. In this embodiment, the curved projection may be a wire having one end attached to the rotatable element.
In optional preferred embodiments, the curved projection(s) may be biased to spring radially outwardly as they pass through the side opening(s) in the sheath. Alternatively, or in addition, the curved projection(s) may be formed from a shape memory material which assists them in springing radially outwards as they pass through the side opening(s) in the sheath.
In various embodiments, the curved projection(s) may either be attached to the rotatable element, or they may be integrally formed into the rotatable element.
In various preferred embodiments, the curved projections are opposite ends of a deformable element such as a wire or ribbon. Most preferably, such deformable element passes through (or is fitted around) the central rotatable element.
The present invention also provides a method of anchoring a device in a body lumen or cavity, including inserting the device into the body lumen or cavity, and rotating the rotatable element with respect to the sheath, thereby causing the distal ends of each of the curved projections to move outwardly through one of the one or more openings and into the body lumen or cavity. In preferred embodiments of the present method, the body lumen may be any blood vessel.
For example,
Each of the four embodiments of the invention (
Referring first to
Returning to
It is to be understood that all reference herein made to rotation of the rotatable element (which is disposed within the sheath) both in the specification and claims, refers to rotation of the rotatable element with respect to the sheath. Thus, “rotation of the rotatable element” in the specification and claims, encompasses rotation of the rotatable element with the sheath held stationary, rotation of the sheath with the rotatable element held stationary, rotation of the sheath and rotatable element in opposite directions, and rotation of the sheath and rotatable element in the same direction, but at different speeds.
As can be appreciated, removal of the present anchoring system is accomplished by simply rotating rotatable element 20 with respect to sheath 12 in a direction opposite to R, thereby retracting curved projections 22A and 22B into the sheath.
As shown in
Projections 22A and 22B may be curved. The projections preferably extend radially from the rotatable element in a plane that may be perpendicular or otherwise transverse to the longitudinal axis of the device or to the rotatable element. Specifically, the projections 22A and 22B move through side openings 14 as the projections are deployed in a radial direction with respect to the axis of the device. Such movement in the radial direction may preferably be confined to movement in the transverse plane defined by the lengths of the projections.
In the preferred embodiment illustrated in
An advantage of curved projections 22A and 22B being ribbon shaped or I-beam shaped (or any other dimension in which they are thicker in the direction along the length of sheath 12) is that they are more resistant to bending when the catheter is pulled in direction P, such that the projections push against the tissue surrounding the interior of opening 11 through tissue wall W (see
It is to be understood that although curved projections 22A and 22B may be opposite ends of a single deformable member 22 (as shown), curved projections 22A and 22B may also be two separate elements which either are fastened to rotatable element 20 or are integrally formed from the same block of material as rotatable element 20. Whether or not curved projections 22A and 22B are opposite ends of a single member, or are separate elements, such curved projections are preferably formed from a deformable material. Suitable deformable materials may include (but are not limited to) metals, including shape memory metals, polymers, or any combinations thereof.
In optional preferred embodiments, curved projections 22A and 22B may be formed of a material which causes them to be biased such that their ends spring radially outwardly (i.e.: straighten out) as they pass through side openings 14. An example of this effect can be seen in
Optionally, curved projections 22A and 22B may be formed of a shape memory material (such as Nitinol). As such, curved projections 22A and 22B may thus be formed to spring radially outwardly (i.e.: straighten out) when they are exposed to a temperature change. For example, curved projections 22A and 22B could be exposed to a temperature change as they exit windows 14 by being warmed by the fluid passing through the body lumen.
In various embodiments, the present invention is substantially enclosed within the body of the catheter, thus saving space and permitting easy access into the interior of body lumen L.
In various preferred embodiments, the present system is dimensioned to be around 5 to 10 mm in diameter, but may instead be dimensioned smaller so that it may fit into vessels less than 5 mm in diameter.
The various embodiments of the invention which are incorporated into a catheter system do not block fluid flow when anchoring a catheter in a body lumen. Thus, the present invention may conveniently be used in conjunction with systems either for drug or therapeutic energy delivery, or with diagnostic systems.
In an alternate embodiment, shown in
The suture-carrying features may be recesses formed in projections 32. For example, the suture-carrying features may include cuffs 33 that may be attached to the ends SI and S2 of a length of suture which runs through the center of device 30. Cuffs 33 can be held within recesses in projections 32. The present suture-carrying features may include cuffs, but the present invention is not so limited. For example, the ends of the suture can alternatively be formed into other features that are connectable to needles, such as loops. Suturing device 30 further comprises a pair of needles 34 that are initially disposed on an exterior of lumen L as shown in
This application is a continuation of U.S. application Ser. No. 12/955,869, filed Nov. 29, 2010, now U.S. Pat. No. 8,202,281, which is a continuation of U.S. application Ser. No. 11/552,593, filed Oct. 25, 2006, now U.S. Pat. No. 7,842,049, which is a divisional application of U.S. patent application Ser. No. 10/335,147, filed Dec. 31, 2002, entitled “Systems for Anchoring a Medical Device in a Body Lumen”, now U.S. Pat. No. 7,160,309, the disclosures of which are incorporated herein by this reference in their entireties.
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Number | Date | Country | |
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20120289903 A1 | Nov 2012 | US |
Number | Date | Country | |
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Parent | 10335147 | Dec 2002 | US |
Child | 11552593 | US |
Number | Date | Country | |
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Parent | 12955869 | Nov 2010 | US |
Child | 13525875 | US | |
Parent | 11552593 | Oct 2006 | US |
Child | 12955869 | US |