Patents by Inventor Lixiao Wang

Lixiao Wang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20030195457
    Abstract: A percutaneous system for bypassing a restriction in a native vessel of a mammal having an aorta includes providing a graft having a body portion with a first end, a second end and a lumen therebetween. An aperture is formed in the aorta. The graft is inserted into the aorta and the first end of the graft is connected to the aorta about the aperture in the aorta. An aperture is then formed in the native vessel distal of the restriction. The second end of the graft is connected to the native vessel about the aperture therein such that the lumen in the graft communicates with the aorta and the native vessel.
    Type: Application
    Filed: May 13, 2003
    Publication date: October 16, 2003
    Applicant: SciMed Life Systems, Inc.
    Inventors: Daniel M. LaFontaine, Kent D. Harrison, Charles L. Euteneuer, Roger N. Hastings, Lixiao Wang
  • Publication number: 20030183966
    Abstract: An apparatus and method for molding balloon catheters is disclosed. The balloon may be molded by providing a polymeric tube within a mold having an interior cavity in the shape of the desired balloon. Microwave energy, which may be generated by a gyrotron, may then be directed toward the mold, to heat the polymeric material without heating the mold. Once heated, pressurized fluid may be injected into the tube to blow the polymeric material against the interior cavity whereupon the material can cool to form the balloon or can be further heatset by additional microwave energy and be cooled to form the balloon. In accordance with one embodiment, microwave energy can also be used without a mold to form a medical device.
    Type: Application
    Filed: August 6, 2002
    Publication date: October 2, 2003
    Inventors: Lixiao Wang, Jan Weber
  • Publication number: 20030167067
    Abstract: A tubular parison for forming a medical device balloon. The parison is formed of a polymeric material, for instance a thermoplastic elastomer. The parison has an elongation at break which is not more than 80% of the elongation of the bulk polymeric material. The elongation of the parison is controlled by altering extrusion conditions. Balloons prepared from the parisons provide higher wall strength and/or higher inflation durability than balloons prepared from conventional parisons of the same material.
    Type: Application
    Filed: February 28, 2002
    Publication date: September 4, 2003
    Inventors: Lixiao Wang, John Jianhua Chen, Jeffrey S. Lindquist, Nao Pao Lee, Douglas A. Devens
  • Publication number: 20030163148
    Abstract: A medical device includes an inflatable balloon formed having portions of different materials, and a cutting element carried by the balloon. The materials can have different distensibility and/or compliancy.
    Type: Application
    Filed: February 27, 2002
    Publication date: August 28, 2003
    Inventors: Lixiao Wang, Steve Wu, Ronald A. Sahatjian, Albert Chin, Peter Dayton
  • Patent number: 6610035
    Abstract: The present invention relates to a medical device for insertion into the body wherein the device has at least one surface which periodically comes into contact with a second surface. The first surface comprises an improved lubricious coating having a first hydrogel layer and a second hydrophobic top coating which prevents the hydrogel coating from prematurely absorbing too much moisture. The hydrophobic top coating comprises at least one hydrophilic surfactant which acts as a carrier to facilitate removal of the hydrophobic top coating upon entry into an aqueous environment.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: August 26, 2003
    Assignee: SciMed Life Systems, Inc.
    Inventors: Dachuan Yang, Lixiao Wang, Joel Stanslaski, Liguang Tang
  • Publication number: 20030152728
    Abstract: Medical devices such as catheters and balloons are formed from a thermoplastic polymer composition comprising a melt mixture product of at least one terminally reactive polymer and a chain extender.
    Type: Application
    Filed: January 23, 2002
    Publication date: August 14, 2003
    Applicant: SCIMED LIFE SYSTEMS, INC.
    Inventors: Lixiao Wang, Jeffrey S. Lindquist, Nao Lee
  • Publication number: 20030138577
    Abstract: A portion of a medical device formed from a melt blend of a polyesterimide anhydride liquid crystal polymer and at least one other polymer.
    Type: Application
    Filed: January 23, 2002
    Publication date: July 24, 2003
    Inventor: Lixiao Wang
  • Publication number: 20030135197
    Abstract: Various coupling agents are disclosed to form lap joints between metallic and polymeric surfaces within catheters and other medical devices. The coupling agents disclosed in the present invention can be applied directly to a metallic surface, or the coupling agents may be incorporated within a polymeric material. In certain circumstances, the mere application of the coupling agent between the two dissimilar materials provides sufficient adhesive strength to form a fatigue-free lap joint bond. Alternative methods utilize coupling agents as primers for later thermal bonding and laser welding procedures that form lap joint bonds.
    Type: Application
    Filed: January 15, 2002
    Publication date: July 17, 2003
    Applicant: SciMed Life Systems, Inc.
    Inventors: Lixiao Wang, Dachuan Yang, Joe Randall, (Bruce) Yiqun Wang
  • Patent number: 6589215
    Abstract: The present invention relates to a medical device for insertion into the body wherein the device has at least one surface which periodically comes into contact with a second surface. The first surface comprises an improved lubricious coating having a first hydrogel layer and a second hydrophobic top coating which prevents the hydrogel coating from prematurely absorbing too much moisture. The hydrophobic top coating comprises at least one hydrophilic surfactant which acts as a carrier to facilitate removal of the hydrophobic top coating upon entry into an aqueous environment.
    Type: Grant
    Filed: December 1, 2000
    Date of Patent: July 8, 2003
    Assignee: SciMed Life Systems, Inc.
    Inventors: Dachuan Yang, Lixiao Wang, Joel Stanslaski, Liguang Tang
  • Patent number: 6585719
    Abstract: The present invention relates generally to elongate support members, preferably for use with a catheter for performing medical procedures including percutaneous transluminal coronary angioplasty. An elongate support member comprising a proximal end and a distal end is disclosed. The proximal end of the elongate support member is formed to define a plurality of flanges. A linkage connects the flanges, and a lumen within the shaft is defined by connecting the flanges. The elongate support member comprises an improved catheter shaft design that maintains pushability, flexibility, and torquability while limiting kinking.
    Type: Grant
    Filed: January 4, 2001
    Date of Patent: July 1, 2003
    Assignee: SciMed Life Systems, Inc.
    Inventor: Lixiao Wang
  • Publication number: 20030120207
    Abstract: A tie layer insert is disclosed to aid in bond formation between an expandable balloon and a distal portion of a catheter shaft. The tie layer insert can be a single layer applied directly to the structural surfaces, or alternatively, the tie layer may be incorporated into a preformed polymeric insert. In the latter embodiment, the polymeric insert may include several layers of polymeric material. During the manufacturing process, the preformed polymeric insert is positioned between the distal portion of the expandable balloon and the catheter shaft. The entire distal region is then processed to form a sealably bonded expandable balloon to the distal end of the catheter shaft.
    Type: Application
    Filed: December 20, 2001
    Publication date: June 26, 2003
    Applicant: SciMed Life Systems Inc.
    Inventor: Lixiao Wang
  • Publication number: 20030114831
    Abstract: The present invention provides a polymeric treatment for curved regions in shaft assemblies that increases curve retention without affecting the flexibility within these regions. More specifically, the present invention modifies the underlying crystalline morphology of a polymer in order to decrease crystal fracturing. In particular, the present invention treats polymeric materials suitable for catheter construction with a nucleating agent.
    Type: Application
    Filed: December 14, 2001
    Publication date: June 19, 2003
    Applicant: SciMed Life Systems, Inc.
    Inventors: (Bruce) Yiqun Wang, John Chen, Lixiao Wang
  • Patent number: 6575168
    Abstract: A percutaneous system for bypassing a restriction in a native vessel of a mammal having an aorta includes providing a graft having a body portion with a first end, a second end and a lumen therebetween. An aperture is formed in the aorta. The graft is inserted into the aorta and the first end of the graft is connected to the aorta about the aperture in the aorta. An aperture is then formed in the native vessel distal of the restriction. The second end of the graft is connected to the native vessel about the aperture therein such that the lumen in the graft communicates with the aorta and the native vessel.
    Type: Grant
    Filed: January 12, 2001
    Date of Patent: June 10, 2003
    Assignee: SciMed Life Systems, Inc.
    Inventors: Daniel M. LaFontaine, Kent D. Harrison, Charles L. Euteneuer, Roger N. Hastings, Lixiao Wang
  • Publication number: 20030100869
    Abstract: A tubular extruded member particularly suitable for use in medical devices such as intravascular catheters and guide wires, wherein the extruded tubular member includes multiple layers having biaxial helical orientation in different directions. A counter-rotation extrusion process may be used to orient the layers in different biaxial helical directions. The counter-rotation extrusion process provides orientation in two different circumferential directions in addition to a longitudinal direction. By combining the dual direction or biaxial helical orientation with multiple layers, different layers of the tubular member may be tailored to have the desired mechanical properties.
    Type: Application
    Filed: January 2, 2003
    Publication date: May 29, 2003
    Applicant: SciMed Life Systems, Inc.
    Inventor: Lixiao Wang
  • Patent number: 6569195
    Abstract: A stent having a polymeric coating for controllably releasing an included active agent. The polymeric coating includes a blend of a first polymeric material, which if alone, would release the agent at a first, higher rate, and a second polymeric material, which if alone would release the agent at a second, lower rate over a longer time period. One stent coating utilizes a faster releasing hydrophilic polymeric material and a slower releasing hydrophobic material. One stent coating includes a blend of a faster releasing PLA-PEO copolymer and a slower releasing PLA-PCL copolymer. One active agent is Taxol. One use of the Taxol delivering stent is to inhibit restenosis following angioplasty.
    Type: Grant
    Filed: June 18, 2001
    Date of Patent: May 27, 2003
    Assignee: SciMed Life Systems, Inc.
    Inventors: Dachuan Yang, Joel L. Stanslaski, Lixiao Wang, Scott R. Smith
  • Publication number: 20030091765
    Abstract: Balloons for use on medical devices such as catheter balloons are formed from polymer blend products which include a liquid crystal polymer (LCP), a crystallizable thermoplastic polymer, especially thermoplastic polyesters such as PET, and a compatabilizer. The compatabilizer may be an ethylene-maleic anhydride copolymer, an ethylene-methyl acrylate copolymer, an ethylene-methyl acrylate copolymer, an ethylene-methyl acrylate-maleic anhydride terpolymer, an ethylene-methyl-methacrylic acid terpolymer, an acrylic rubber, an ethylene-ethyl acrylate-glycidyl methacrylate terpolymer or a mixture of two or more such polymers.
    Type: Application
    Filed: December 16, 2002
    Publication date: May 15, 2003
    Applicant: SciMed Life Systems, Inc.
    Inventors: David A. Ferrera, George C. Michaels, Ralph J. Barry, Lixiao Wang, Jianhua Chen
  • Patent number: 6562061
    Abstract: A stent delivery balloon structure is formed by molding at a desired pressure, temperature and tension a medical balloon with a tube disposed thereabout and subsequently removing one or more layers of material from the body portion of the thus formed medical balloon structure.
    Type: Grant
    Filed: February 22, 2000
    Date of Patent: May 13, 2003
    Assignee: SciMed Life Systems, Inc.
    Inventors: Lixiao Wang, John Jianhua Chen
  • Publication number: 20030055378
    Abstract: An inflatable medical balloon for multiple procedures, including angioplasty procedures, procedures for delivering medical devices, such as stents, and a method of making the catheter systems. The catheter system employs a balloon having a plurality of flexible portions and a combination of hard and soft portions.
    Type: Application
    Filed: September 14, 2001
    Publication date: March 20, 2003
    Inventors: Yiqun Bruce Wang, John Jianhua Chen, Lixiao Wang, Jason Todd Lenz
  • Patent number: 6528150
    Abstract: This invention relates to a dilatation balloon formed from an extruded tubular preform by blowing, said balloon having a body, at least one cone and at least one waist portion wherein said balloon has a lubricity coating gradient from the body portion which has the lowest coat thickness to the waist portion which has the highest coat thickness said coating applied to said extruded tubular preform prior to forming said balloon by blowing.
    Type: Grant
    Filed: April 5, 2001
    Date of Patent: March 4, 2003
    Assignee: SciMed Life Systems, Inc.
    Inventors: Irina Nazarova, Lixiao Wang
  • Publication number: 20030040702
    Abstract: This invention relates to medical devices comprising melt-processible PTFE and methods of making same.
    Type: Application
    Filed: August 27, 2001
    Publication date: February 27, 2003
    Inventor: Lixiao Wang