Patents Assigned to IMPRA, Inc., a subsidiary of C. R. Bard, Inc.
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Publication number: 20040064181Abstract: A vascular prosthesis configured for direct connection to an artery. The vascular prosthesis may include a tube of material other than autologous vascular tissue, having an end formation, which is configured for surgical connection to an opening formed in the artery, and a narrower portion prior to commencement of the end formation. The end formation may have an enlarged chamber adapted to induce a concave section in said blood vessel upon attachment thereto.Type: ApplicationFiled: June 25, 2003Publication date: April 1, 2004Applicant: IMPRA, Inc., a subsidiary of C.R. Bard, Inc.Inventors: Peter Lyon Harris, Thien Voon How
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Patent number: 6620190Abstract: Extruded, stretched, sintered tubular PTFE materials are produced which are suited for use in the medical field as liners and covers for expandable stents. The PTFE materials have an unusually low REC (Radial Expansion Coefficient) and RER (Radial Expansion Ratio).Type: GrantFiled: December 26, 1996Date of Patent: September 16, 2003Assignee: Impra, Inc., a subsidiary of C.R. Bard, Inc.Inventor: William M. Colone
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Publication number: 20030158595Abstract: An anchoring device for incorporation into an endoluminal prosthesis to prevent migration thereof in a reliable way without the problems associated with intraluminal delivery of the prosthesis. The anchoring device allows smooth, efficient delivery of the prosthesis by providing an anchoring system that does not engage the delivery catheter or sheath upon deployment of the prosthesis within a body lumen.Type: ApplicationFiled: February 20, 2002Publication date: August 21, 2003Applicant: IMPRA, Inc., a subsidiary of C.R. Bard Inc.Inventors: Scott Randall, William Bratt
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Publication number: 20020091440Abstract: An improved drug delivery graft comprises a drug delivery device coupled to an outer wall of a porous graft. An agent is conducted by the drug delivery device from a source to the outer wall of the graft where it is released to diffuse into the lumen of the graft through porous interstices of the outer wall.Type: ApplicationFiled: January 31, 2002Publication date: July 11, 2002Applicant: IMPRA, Inc., a subsidiary of C.R. Bard, Inc.Inventor: Robert W. Calcote
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Patent number: 6398803Abstract: Partially encapsulated stents are made using gaps cut into ePTFE covering material. Ring stents are placed over an inner ePTFE tube (e.g., supported on a mandrel) and are covered by a “lacey” graft sleeve, which is constructed by cutting apertures into an ePTFE tube so that a series of circumferential and longitudinal strips is created. This “lacey” sleeve is then laminated to the inner ePTFE tube to capture the stents. By selecting the size and position of the apertures in the ePTFE covering, it is possible to leave critical parts of the stent unencapsulated to facilitate flexibility and expansion. Alternatively, the gaps can consist of slits cut into the ePTFE covering material. These slits can be cut in any direction including longitudinally, radially, or diagonally. In addition, the slits can be spaced at varying intervals around the covering material to maximize flexibility and expandability.Type: GrantFiled: September 2, 1999Date of Patent: June 4, 2002Assignee: IMPRA, Inc., a subsidiary of C.R. Bard, Inc.Inventors: Richard Layne, Sandra Cundy, Debra Bebb
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Patent number: 6383214Abstract: An encapsulated stent having a stent or structural support layer sandwiched between two biocompatible flexible layers. One preferred embodiment has a stent cover which includes a tubular shaped stent that is concentrically retained between two tubular shaped grafts comprised of expanded polytetrafluoroethylene. Another preferred embodiment has a stent graft which includes at least one stent sandwiched between the ends of two tubular shaped grafts wherein at least a portion of the grafts are unsupported by the stent. Still another embodiment includes an articulating stented graft which includes a plurality of stents spaced apart from one another at a predetermined distance wherein each stent is contained between two elongated biocompatible tubular members. The graft/stent/graft assemblies all have inseparable layers.Type: GrantFiled: March 21, 2000Date of Patent: May 7, 2002Assignee: IMPRA, Inc., a subsidiary of C. R. Bard, Inc.Inventors: Christopher E. Banas, Tarun J. Edwin
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Publication number: 20010039446Abstract: Shape memory alloy and elastically self-expanding endoluminal stents which are at least partially encapsulated in a substantially monolithic expanded polytetrafluoroethylene (“ePTFE”) covering. An endoluminal stent, which has a reduced diametric dimension for endoluminal delivery and a larger in vivo final diametric diameter, is encapsulated in an ePTFE covering which circumferentially covers both the luminal and abluminal walls along at least a portion of the longitudinal extent of the endoluminal stent. The shape memory endoluminal stent is fabricated from a shape memory alloy which exhibits either shape memory or pseudoelastic properties or from an elastic material having an inherent spring tension.Type: ApplicationFiled: April 9, 1997Publication date: November 8, 2001Applicant: IMPRA, Inc., a subsidiary of C.R. Bard, Inc.Inventors: TARUN J. EDWIN, BRENDAN J. MCCRAE, CHRISTOPHER E. BANAS
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Publication number: 20010010012Abstract: A method for selectively bonding layers of polymeric material, especially expanded polytetrafluoroethylene (ePTFE), to create endoluminal vascular devices. In a preferred method the selective bonding is achieved by applying pressure to selected areas using a textured mandrel. This permits a stent device to be encapsulated between two layers of ePTFE with unbonded slip pockets to accommodate movement of the structural members of the stent. This allows stent compression with minimal force and promotes a low profile of the compressed device. Unbonded regions of ePTFE allow enhanced cellular penetration for rapid healing and can also contain bioactive substance that will diffuse through the ePTFE to treat the vessel wall.Type: ApplicationFiled: January 16, 2001Publication date: July 26, 2001Applicant: IMPRA, Inc., a subsidiary of C.R. Bard, Inc.Inventors: Tarun J. Edwin, Scott L. Randall, Brendan McCrea, Christopher E. Banas
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Patent number: 6264684Abstract: Shape memory alloy and elastically self-expanding endoluminal support structures which are at least partially encapsulated in a substantially monolithic expanded polytetrafluoroethylene (“ePTFE”) covering. An endoluminal stent, which has a reduced diametric dimension for endoluminal delivery and a larger in vivo final diametric diameter, is encapsulated in an ePTFE covering which circumferentially covers both the luminal and abluminal walls along at least a portion of the longitudinal extent of the endoluminal stent. The stent and ePTFE covering are helically wound into an open cylindrical configuration with adjacent windings forming overlapping regions of ePTFE covering bonded to one another.Type: GrantFiled: December 22, 1997Date of Patent: July 24, 2001Assignee: IMPRA, Inc., a subsidiary of C.R. Bard, Inc.Inventors: Christopher E. Banas, Tarun J. Edwin, Brendan J. McCrea, Rajagopal R. Kowligi
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Patent number: 6214039Abstract: A radially expandable endoluminal covered stent assembly and a method and apparatus for making the same. A longitudinally and radially expanded polytetrafluoroethylene tubular graft is circumferentially engaged about one or more radially expandable stents and is retained thereon by a radial recoil force exerted by the tubular graft against the stent. The graft is retained on the stent or stents prior to and during endoluminal delivery and radial expansion without the use of adhesives, sutures or other attachment means. Further, upon radial expansion the stent or stents do not require retaining means for preventing contraction, despite the inherent recoil imparted by the tubular graft. The covered stent is assembled by joining a dilation mandrel and a stent mandrel, placing the graft on the dilation mandrel where it is radially expanded, and passing the expanded graft over the stent that is positioned on the stent mandrel.Type: GrantFiled: February 18, 1998Date of Patent: April 10, 2001Assignee: IMPRA, Inc., a subsidiary of C. R. Bard, Inc.Inventors: Christopher E. Banas, Rajagopal R. Kowligi, Roy H. Tang
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Patent number: 6096027Abstract: An apparatus for loading a stent onto or into a catheter. A flexible sterile sleeve is provided to encase the stent as it is pulled through a loading device. The loading device is a simple design utilizing a tapered passageway. The passageway has first diameter at a proximal end which tapers to a second diameter, forming a funnel. The passageway continues at the second diameter forming a tube. The sleeved stent is pulled through the loading device from the proximal end to the distal end, smoothly compressing the stent. Depending on the type of stent and catheter being used, the stent is either crimped onto the catheter as it is pulled through the funnel, or is loaded into a catheter positioned at the distal end of the loading device. The sleeve acts to minimize the frictional forces to which the stent is subjected and to eliminate the longitudinal force that the stent would be subjected to if pushed or pulled directly. The sleeve may be close-ended to provide an additional sterility barrier about the stent.Type: GrantFiled: May 12, 1999Date of Patent: August 1, 2000Assignee: Impra, Inc., a subsidiary of C.R. Bard, Inc.Inventor: Richard Layne