308 results about "Expanded polytetrafluoroethylene" patented technology

A surgical implant is provided that includes first and second abutment surfaces between which are positioned a force imparting mechanism. A sheath is positioned between the first and second abutment surfaces, and surrounds the force imparting mechanism. The sheath is fabricated from a material that accommodates relative movement of the abutment members, while exhibiting substantially inert behavior relative to surrounding anatomical structures. The sheath is generally fabricated from expanded polytetrafluoroethylene, ultra-high molecular weight polyethylene, a copolymer of polycarbonate and a urethane, or a blend of a polycarbonate and a urethane. The force imparting member may include one or more springs, e.g., a pair of nested springs. The surgical implant may be a dynamic spine stabilizing member that is advantageously incorporated into a spine stabilization system to offer clinically efficacious results.

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.

An embolic occlusion device for the treatment of aneurysms and arteriovenous malformations comprises expanded polytetrafluoroethylene (ePTFE). The ePTFE permits ingrowth of cells with connective tissue deposition to promote adherence of the aneurysm wall to the embolic device thereby preventing continued growth or re-growth of the aneurysm as well as blocking blood flow into an aneurysm. An occlusion device is also described which comprises an embolic element and a polymeric pre-formed component.

A catheter balloon formed of a polymeric material such as expanded polytetrafluoroethylene (ePTFE) bonded to a second layer formed of a low tensile set polymer and/or impregnated with a low tensile set polymer. In a presently preferred embodiment, the low tensile set polymer is a silicone-polyurethane copolymer elastomer or a diene polymer elastomer. The low tensile set polymer has high strength, low modulus, high elongation, and low tensile set. The diene or silicone-polyurethane has a low tensile set, which facilitates deflation of the balloon to a low profile deflated configuration. One aspect of the invention provides improved attachment of the diene to the ePTFE. In one embodiment, the second layer is formed of a diene mixed with a bonding promoter such as a vulcanizing agent which is covalently bonded to the diene.

An apparatus is provided that includes a graft for coupling two vascular conduits within a patient. The graft includes: 1) an anchor system that forms an arc at one end of the conduits; and 2) a body element coupled to the anchor system. The anchor system comprises a biodegradable stent. In particular embodiments, portions of the graft are either self-expandable or balloon-expandable. In still other embodiments, anchor system includes NITINOL and the anchor system is substantially self-sealing at one end of the conduits. In one embodiment, the body element comprises polytetrafluoroethylene (PTFE) or expanded polytetrafluoroethylene (EPTFE). In yet other embodiments, the body element includes either a gelatinous or an elastomeric coating disposed on its surface.

The invention relates to medical devices and methods of using them. The devices are prostheses which can be percutaneously deliverable with (or on) an endovascular catheter or via other surgical or other techniques and then expanded. The prostheses are configured to have a lattice resistant to dilation and creep, which is defined by a plurality of openings. The prosthesis may also optionally have a stent disposed proximal to the lattice. In exemplary embodiments, the fluoropolymer is expanded polytetrafluoroethylene. The composite materials exhibit high elongation while substantially retaining the strength properties of the fluoropolymer membrane. In at least one embodiment, the lattice is made of a composite material that includes a least one fluoropolymer membrane including serpentine fibrils and an elastomer. A lattice including a generally tubular member formed of a composite material including a least one fluoropolymer membrane containing serpentine fibrils and an elastomer is also provided.

Articles including expanded fluoropolymer membranes having serpentine fibrils are provided. The fluoropolymer membranes exhibit high elongation while substantially retaining the strength properties of the fluoropolymer membrane. The membrane may include a fluoropolymer and/or elastomer. Additionally, the article has an elongation in at least one direction of at least about 100% and a matrix tensile strength of at least about 50 MPa. The article may be formed by (1) expanding a dried, extruded fluoropolymer tape in at least one direction to produce an expanded fluoropolymer membrane and (2) retracting the expanded fluoropolymer membrane in at least one direction of expansion by applying heat or by adding a solvent. The application of a tensile force at least partially straightens the serpentine fibrils, thereby elongating the article. The expanded fluoropolymer membrane may include a microstructure of substantially only fibrils. The membranes may be imbibed with an elastomeric material to form a composite.

Articles comprising an expanded polytetrafluoroethylene membrane having serpentine fibrils and having a discontinuous coating of a fluoropolymer thereon are provided. The fluoropolymer may be located at least partially in the pores of the expanded fluoropolymer membrane. In exemplary embodiments, the fluoropolymer is fluorinated ethylene propylene. The application of a tensile force at least partially straightens the serpentine fibrils, thereby elongating the article. The expanded polytetrafluoroethylene membrane may include a microstructure of substantially only fibrils. The articles can be elongated to a predetermined point at which further elongation is inhibited by a dramatic increase in stiffness. In one embodiment, the articles are used to form a covered stent device that requires little force to distend in the radial direction to a first diameter but is highly resistant to further distension to a second diameter (stop point). A large increase in diameter can advantageously be achieved prior to reaching the stop point.

A vascular graft comprised of a tubular polytetrafluoroethylene (ePTFE) sheet is provided. The ePTFE sheet has a substantially uniform coating of bioresorbable gel material, for example gelatin, on a surface thereof. The coating minimises bleeding through suture holes in the ePTFE sheet and provides an increase in longitudinal extensibility.

An improved fluoroplastic lined elastomeric tube that can maintain a stable flow rate while pumping aggressive chemicals in a peristaltic pump for an extended period of time and is fabricated in sizes ranging from 0.5 mm to 100 mm in inside diameter. The inner fluoroplastic liner comprises a composite of expanded polytetrafluoroethylene and a fluoroplastic polymer resulting in improved flex life over single component fluoroplastics. The inventive liner is bonded to either an unreinforced elastomer or a fiber reinforced elastomer for use in both low and high pressure peristaltic pump applications.

A fishing line having multiple UHMWPE fibers and (b) at least one fluoropolymer fiber comprising expanded polytetrafluoroethylene.

A durable membrane that includes a membrane that is moisture vapor transmissive and resistant to liquid penetration, and a non-continuous application of a thermoplastic elastomer on a side of the membrane. The membrane may be an expanded polytetrafluoroethylene membrane. The thermoplastic elastomer may be polyurethane. The non-continuous application of thermoplastic elastomer on a side of the membrane may include an application of thermoplastic elastomer that covers a portion of the surface area of the membrane and leaves the remainder uncovered.

A method of making an tubular intraluminal graft in the form of a tubular diametrically adjustable stent having a tubular covering of porous expanded polytetrafluoroethylene which is less than 0.10 mm thick. The covering may be on the exterior surface of the stent, or on the interior surface of the stent, or both. The covering may be affixed to the stent by an adhesive which is preferably fluorinated ethylene propylene.

The invention discloses a coating film with the large moisture permeability. The coating film comprises a basic film layer and a coating layer, wherein the basic film layer is an expanded polytetrafluoroethylene film layer; the coating layer coating the expanded polytetrafluoroethylene film layer is a polyurethane emulsion copolymerization coating layer containing superfine micro-powder of hemp stalk cores; a coating agent of the polyurethane emulsion copolymerization coating layer containing the superfine micro-powder of the hemp stalk cores is prepared by uniformly stirring the following raw materials in percentage by weight: 20-25% of polyurethane; 55-60% of a dimethylfomamide solvent; 2-5% of a hydrophilic group solvent and 18-25% of the superfine micro-powder of the hemp stalk cores. Through the manner, the coating film has good moisture absorbing and guide performances; the content of moisture permeable factor fibrin in the superfine micro-powder of the hemp stalk cores is large; micro-grooves and micropores exist in the coasting film, so that the moisture absorption area and the diffusion area are increased; the coating film has excellent performances such as ultraviolet resistance, water proofing, dust proofing, oil proofing, moisture permeability and corrosion resistance on oxide solutions.

A composite article includes a base material and a porous membrane laminated with the base material. The porous membrane has hydrophobic properties and includes at least one of expanded polytetrafluoroethylene, woven polytetrafluoroethylene, and non woven polytetrafluoroethylene. A coating layer is formed on at least a portion of the porous membrane. The coating layer has hydrophilic properties and includes at least one of an organofunctional siloxane and a polyether urethane polymer.

A separator for a wound electrochemical device comprising an expanded polytetrafluoroethylene membrane having pores defining an internal surface area, the internal surface area being substantially coated with a pore coating agent, the separator having a longitudinal modulus of greater than 20,000 lbs/in².