| Orbital atherectomy device guide wire design -> Monitor Keywords |
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Orbital atherectomy device guide wire designRelated Patent Categories: Surgery, Instruments, Blood Vessel, Duct Or Teat Cutter, Scrapper Or AbraderOrbital atherectomy device guide wire design description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060142793, Orbital atherectomy device guide wire design. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This is a continuation-in-part of U.S. patent application filed Jan. 7, 2004 and titled TERMINAL GUIDE FOR ROTATIONAL ATHERECTOMY DEVICE AND METHOD OF USING SAME. BACKGROUND OF THE INVENTION [0002] The present invention relates to medical devices and, more particularly, to guide wires for positioning and stabilization of intravascular medical devices. [0003] Atherectomy devices are generally designed to remove stenotic occlusions from human arteries and bypass grafts. Atherectomy devices take a number of forms from mechanical cutting devices to various rotating abrading device. [0004] The OAD consists of three stainless steel wires, helically wound to produce a device driveshaft. The OAD has an expanded, eccentric cross-section with an attached diamond surface "crown" located near the distal end. The OAD is revolved at rotational velocities up to 200,000 rpm, with the "crown's" abrasive surface removing stenotic tissue. The Orbital Atherectomy Device is deployed along and rotates around a pre-positioned guide wire. [0005] A current guide wire design is shown in FIG. 1. As seen in the Figure, the guide wire G incorporates a flexible distal tip T that facilitates deployment of the guide wire G through the vascular system. The flexible tip T consists of polytetrafluoroethylene (PTFE) which is commercially available under the name Teflon.RTM. from E.I. du Pont de Nemours and Company. The flexible tip T is in the form of heat shrink tubing and is attached to the distal end D of the guide wire G. A flexible, distal, tubular portion P of the tip T can contain embedded platinum marker bands B at specified intervals to enhance radio-opacity. The flexible tip T with marker bands may extend approximately 25-30 mm past the distal end D of the guide wire G. The flexible tip permits the distal end of the guide wire G to be guided in a relatively atraumatic fashion to a desired location within the vasculature of a patient. [0006] The following problems have been observed during deployment of the OAD over the pre-positioned guide wire: [0007] With some prior guide wires, the distal end of the OAD may be extended over the PTFE tubing attached to the distal end of the guide wire shaft. [0008] Further, the contact of the OAD driveshaft with the flexible PTFE tubing has been found to cause torsion and bending failure of the PTFE tubing with the failed segment difficult to extract. [0009] In addition, the rotating OAD driveshaft inner surface creates surface erosion of the PTFE tubing, failing the PTFE tip, friction welding of the OAD to the guide wire, and resulting in premature failure of the OAD and/or the guide wire. [0010] There is a need for an improved OAD guide wire design that addresses the above problems. SUMMARY OF THE INVENTION [0011] A guide wire for assisting in implantation and balancing of an orbital atherectomy device is disclosed. The guide wire is generally configured to be received within a driveshaft and cutting region of the orbital atherectomy device. The guide wire is sufficiently flexible to minimize trauma to the vessel walls is positioned within a patient. The distal end of the guide wire can include on or more weighted elements movable along the distal region of the guide wire to permit the balancing of an a rotating drive shaft and cutting region of an orbital atherectomy device. The guide wire can also include an atraumatic tip located on the end of the guide wire to reduce trauma to the vessels during implantation. Lubricious coatings are also provided to reduce friction between the driveshaft and cutting region of the atherectomy device and guide wire. BRIEF DESCRIPTION OF THE DRAWINGS [0012] FIG. 1 illustrates an embodiment of a guide wire of the prior art. [0013] FIG. 2 illustrates a perspective view of an embodiment of a guide wire in accordance with the present invention; [0014] FIG. 3 illustrates a perspective view of an orbital atherectomy device using a guide wire in accordance with the present invention; [0015] FIG. 4 illustrates an elevational view of an embodiment of a guide wire in accordance with the present invention; [0016] FIG. 5 illustrates a detailed elevational view of an embodiment of a guide wire in accordance with the present invention; [0017] FIG. 6 illustrates an embodiment of an atherectomy device including an embodiment of a guide wire in accordance with the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT [0018] The present invention relates to a novel design for a guide wire that is generally illustrated throughout the figures as guide wire 10. The figures illustrate the guide wire 10 in particular embodiments and, in some figures, in conjunction with particular medical devices for ease of description and understanding. The figures are not intended to limit the possible applications of the present invention. The scope of the invention will be defined by the claims and will be understood by those skilled in the art upon review of the specification and figures. [0019] Turning to FIG. 2, guide wire 10 is generally configured to permit distal region 16 of guide wire 10 to be positioned, relatively atraumatically, at a desired location within a patient. Accordingly, guide wire 10 is flexible and includes an atraumatic tip 18 to prevent damage to tissues as the guide wire is advanced. [0020] Guide wire 10 generally includes an elongated shaft 12 having a proximal region 14, a central region 15, and a distal region 16. Typically, elongated shaft 12 will have a circular cross-sectional shape although particular applications of the present invention may utilize alternative cross-sectional shapes in one or more regions of the guide wire. The shape, configuration and materials used to construct the shaft will determine the physical characteristics such as steerability and torquability and can vary with the particular end use for the guide wire 10. Similarly, guide wire 10 may be configured in a wide range of lengths and diameters depending on its application. For example, the guide wire can be between 180 to 325 centimeters in length and shaft 12 may have an outside diameter of about 0.009 inch for use in conjunction with a rotational atherectomy device 100, as shown in FIG. 3. To reduce the likelihood of adverse biological reactions, guide wire 10 is typically formed from biocompatible materials. These materials are commonly biocompatible metals or polymers. 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