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Stent delivery catheterStent delivery catheter description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20090105802, Stent delivery catheter. Brief Patent Description - Full Patent Description - Patent Application Claims
This application is a continuation of U.S. patent application Ser. No. 10/764,054, filed Jan. 23, 2004, the entire disclosure of which is incorporated herein by reference. The present invention is related generally to medical devices. More specifically, the present invention is related to catheters. The present invention includes stent delivery catheter apparatus with a tapered tip that is fracturable during deployment of a self-expanding stent that has been loaded onto the catheter. Atherosclerotic disease is a leading cause of death in the industrialized world, particularly in the United States. Many heart attacks and strokes are caused in part by a narrowed, stenosed blood vessel. A medical procedure commonly used to deal with vessel stenosis is angioplasty. Angioplasty, in particular Percutaneous Transluminal Angioplasty (PTA), includes inserting a balloon catheter into the femoral artery near the groin, and advancing the catheter to the stenosis. The balloon can then be inflated to widen or dilate the narrowed region. The balloon catheter can then be withdrawn. In some cases, the widened vessel rebounds or re-closes, narrowing the vessel over a period of time. Stents have come into increasing use to prevent the widened vessel regions from narrowing after angioplasty. A stent, typically having a tubular shape, can be put in place in the widened vessel region to hold the vessel walls apart and the lumen open in the event the conditions would otherwise result in re-stenosis. One class of stents requires that the stent be forcibly outwardly expanded to put the stent into position against the vessel walls. Another class of stents, self-expanding stents, can be delivered to a site in a compressed or constrained configuration and released in the vessel region to be supported. The self-expanding stent then expands in place to a configuration having a wide lumen, typically pressing firmly against the vessel walls where released. The stent is commonly placed at a recently dilated, stenosed vessel region. Self-expanding stents can be delivered to a target site mounted over an inner tube or shaft and constrained within the distal end of an enclosing retractable tube or sleeve. The self-expanding stent can be freed from the restraint of the outer sheath by either distally pushing the inner shaft against the stent or proximally pulling the retractable outer sheath from over the stent. Once free of the outer restraint, the self-expanding stent can expand to force itself against the vessel inner walls. Self-expanding stents are often elastically biased to assume an original larger shape after being temporarily compressed into a smaller size to more easily be transported through blood vessels to the target site. There is an ongoing need for improvements in catheters that deliver self-expanding stents. Generally, the present invention relates to a stent delivery device having a tapered tip that is fracturable during deployment or by deploying a self-expanding stent from the stent delivery device. In one embodiment, a self-expanding stent delivery assembly includes a shaft having a proximal end, a distal end, a distal region, a lumen, and a longitudinal axis. A retractable sheath having an outer surface, a proximal end and a distal end is co-axially disposed around the shaft distal region. A stent is disposed co-axially between the shaft and the retractable sheath. A tubular tapered tip is bonded to the retractable sheath distal end. The tubular tapered tip has an elongate region predisposed to fracturing. In another embodiment, a method of delivering a self-expanding stent includes placing a stent delivery device at a target site. The stent delivery device includes a shaft having a proximal end, a distal end, a distal region, a lumen, and a longitudinal axis; a retractable sheath having a proximal end and a distal end co-axially disposed around the shaft distal region; a stent disposed co-axially between the shaft and the retractable sheath; and a tubular tapered tip bonded to the retractable sheath distal end, the tubular tapered tip having an elongate region predisposed to fracturing. The stent is deployed at the target site by retracting the retractable sheath or advancing the stent and fracturing the elongate region predisposed to fracturing. The stent delivery device is then removed from the target site. The above summary of the present invention is not intended to describe each disclosed embodiment or every implementation of the present invention. The Figures and Detailed Description which follow more particularly exemplify these embodiments. The invention may be more completely understood in consideration of the following detailed description of various embodiments of the invention in connection with the accompanying drawings, in which: Continue reading about Stent delivery catheter... Full patent description for Stent delivery catheter Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Stent delivery catheter patent application. Patent Applications in related categories: 20090281610 - Delivery system with low longitudinal compressibility - An improved delivery system for an implantable medical device includes a retention sheath having a proximal end, a distal end, and an inner lumen extending from the proximal end to the distal end. The implantable medical device is disposed within the inner lumen of the retention sheath, which restrains the ... 20090281610 - Delivery system with low longitudinal compressibility - An improved delivery system for an implantable medical device includes a retention sheath having a proximal end, a distal end, and an inner lumen extending from the proximal end to the distal end. The implantable medical device is disposed within the inner lumen of the retention sheath, which restrains the ... 20090281611 - Sliding restraint stent delivery systems - Medical device and methods for delivery or implantation of prostheses within hollow body organs and vessels or other luminal anatomy are disclosed. The subject technologies may be used in the treatment of atherosclerosis in stenting procedures. For such purposes, a self-expanding stent may be deployed in connection with an angioplasty ... 20090281611 - Sliding restraint stent delivery systems - Medical device and methods for delivery or implantation of prostheses within hollow body organs and vessels or other luminal anatomy are disclosed. The subject technologies may be used in the treatment of atherosclerosis in stenting procedures. For such purposes, a self-expanding stent may be deployed in connection with an angioplasty ... 20090281609 - Two-step heart valve implantation - A two-part implantable heart valve and procedure are disclosed that allow expansion and positioning of a first part of the implantable heart valve having a temporary or transient valvular structure. A second part of the implantable heart valve is deployed within the first part and attaches thereto. The valvular structure ... 20090281609 - Two-step heart valve implantation - A two-part implantable heart valve and procedure are disclosed that allow expansion and positioning of a first part of the implantable heart valve having a temporary or transient valvular structure. A second part of the implantable heart valve is deployed within the first part and attaches thereto. The valvular structure ... ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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