Cutting wire assembly for use with a catheter
a cutting wire and catheter technology, applied in the field of system and method of treating stenotic lesions of vessels, can solve the problems of long recovery time for patients, adversely affecting vessel function, and weakening of the vessel wall
Inactive Publication Date: 2014-06-05
REX MEDICAL LP
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AI Technical Summary
Benefits of technology
The patent describes a device for treating a lesion in a body lumen. The device has a cutting member and a tracking member that are connected at their distal ends and insertable into the body lumen as a unit. The cutting member is designed to move in a direction transverse to the tracking member to widen the gap between them at the distal region. The device also has an expandable balloon that causes the cutting member to move radially with respect to the catheter when it is expanded. The technical effect of this invention is to provide a device that can effectively treat lesions in a body lumen and enlarge the passageway through them.
Problems solved by technology
This procedure is traumatic, complex, and results in a long recovery time for the patient.
It also causes a weakening of the vessel wall since a portion of the wall is removed.
A weakened wall can ultimately result in an aneurysm which is a dilatation (expansion) of the artery, which adversely affects vessel function and if not surgically treated could be life threatening to the patient.
However, such high pressure balloons apply more force and increase the risk of vessel trauma and rupture.
Additionally, the use of these angioplasty balloon catheters oftentimes have only short term effect as it has been found that restensois frequently occurs after such treatment.
One of the many disadvantages of this device, however, is it requires modifications of balloon catheters which significantly increases the cost of the catheter.
Another disadvantage is that instead of using the procedural catheter, a different catheter may be required with a cutting balloon.
Consequently, the surgeon would need to decide prior to the procedure which type of catheter to utilize, although this may not always be practical as the information to determine the type (e.g. resistance) of the lesion may not be available until the lesion is accessed and the extent of the disease is known.
Thus, for example, the surgeon may insert an angioplasty catheter, inflate the balloon and find that it is insufficient to widen the vessel passageway.
Since the catheters are inserted from a remote site, e.g. through the femoral artery, these catheter exchanges take time and increase trauma to the patient.
Additionally, it adds to the cost of the procedure since two catheters would be required.
Conversely, in certain procedures, utilizing a cutting balloon in soft lesions increases the risk of trauma or damage to the vessel and therefore it would not be desirable to use a cutting balloon catheter.
Such catheter exchanges might also require guidewire exchanges since the standard 0.035″ guidewire utilized for an angioplasty catheter may be too large for the 0.018″ cutting balloon catheter.
The guidewire exchanges complicate the procedure, increase the risk to the patient and increase the procedure time, thereby increasing costs to the patient.
This device would not work for angioplasty catheters with small guidewire lumens.
Because of the complexity of the device, the cutting elements in the four channels would need to be sufficiently thin to be maintained in the smaller diameter device.
Such thin (small diameter) cutting elements however may be too flexible and not have adequate stiffness to be effective.
Additionally, the cutting elements are attached at one end, having an opposite free end which can potentially damage and perforate the vessel wall during use.
Method used
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[0050]Referring now in detail to the drawings wherein like reference numerals identify similar or like components throughout the several views, the cutting assembly of the present invention includes a cutting member (or element) and a tracking member (or element). More, specifically, cutting assembly includes an assembly 10 having a tracking member, designated generally by reference numeral 30 and preferably in the form of a wire, and a cutting member, designated generally by reference numeral 20 and preferably in the form of a wire. As discussed in more detail below, the tracking wire 30 and cutting wire 20 are preferably attached at a distal portion so they are insertable as a unit. The wire assembly 10, as described below, can be used with a conventional catheter, such as an angioplasty catheter.
[0051]The device of the present invention functions to treat the stenotic lesion inside the vessel wall, thereby opening or enlarging the passageway in the vessel which was restricted. Th...
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A method of treating a lesion in a body lumen to enlarge a passageway in the lumen including inserting a cutting member and tracking member through a first lumen of a catheter, withdrawing the catheter from the cutting member and tracking member, inserting the catheter over the tracking member and leaving the cutting member outside the catheter, and expanding a portion of the catheter to move the cutting member into cutting contact with the lesion. A device for treating a lesion in a body lumen including a cutting member and tracking member is also provided.
Description
[0001]This application claims priority from provisional application Ser. No. 61 / 390,217, filed Oct. 6, 2010, the entire contents of which are incorporated herein by reference.BACKGROUND[0002]1. Technical Field[0003]This application relates to a system and method for treating stenotic lesions of a vessel and more particularly relates to a cutting wire for use with a catheter to open stenotic lesions in vessels.[0004]2. Background of Related Art[0005]Several methods have been utilized to treat stenotic lesions of vessels. With stenotic lesions, the vessel diameter is constricted and therefore attempts have been made to widen this constriction. One method is an invasive surgical procedure where the vessel wall is cut open and the portion containing the plaque or other constricting structure is removed. This procedure is traumatic, complex, and results in a long recovery time for the patient. It also causes a weakening of the vessel wall since a portion of the wall is removed. A weakene...
Claims
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IPC IPC(8): A61B17/3207
InventorSCHUR, ISRAELMCGUCKIN, JR., JAMES F.BRESSLER, JAMES ERICH
OwnerREX MEDICAL LP