摘要:
The invention relates to a vent array comprising a plurality of venting regions comprising a porous PTFE matrix material and a nonporous material comprising a substrate material having a plurality of perforations, wherein the substrate material fills the pores of a porous PTFE matrix material to form nonporous regions, the nonporous regions interconnecting the plurality of venting regions.
摘要:
Compositions are provided, derived from chemical treatment of carbonaceous fiber felt forms or other carbonaceous substrates, that exhibit both high efficiency and capacity for mercury capture from flue gases and the like. These compositions are superior to known compositions, particularly with regard to their performance under severely deactivating conditions. The compositions result from the pyrolysis of certain specific sulfur bearing compounds while in contact with activated carbon powders, activated carbon fibers, or with other carbonized forms. Precursor compounds to these novel mercury-binding compositions contain structural moieties that may be represented as: where X, Y are individual atoms or are functional groups consisting of several atoms, such that the atom bonding to sulfur is not hydrogen. X and Y can be linked in cyclic structures, either directly or through other atoms.
摘要:
An improved filtration apparatus, filtering method and filtering material for capturing mercury and other pollutants in pollutant-laden fluid streams such as flue gases generated by process gas streams are disclosed. The improved filtration system may include two pollutant remediation layers, an upstream layer capable of filtering particulates and a downstream layer capable of adsorbing and/or catalyzing pollutants such as mercury, dioxin, furans, and NOx. The improved filtration system may be in the form of a particulate filter bag. The particulate filter bag may be configured for use in a reverse air filtration system with the upstream layer facing an internal volume of the bag. The upstream layer may include an ePTFE layer laminated to the upstream side of the upstream layer.
摘要:
The present invention relates to materials having therapeutic compositions releasably contained within the materials. The materials are configured to release therapeutic compositions at a desired rate. The present invention also relates to devices incorporating the materials.
摘要:
A prosthetic implantable device that offers a reduction in fluid loss when the device is punctured, such as by a dialysis needle or suture needle, and the needle is subsequently removed. The device may be made to be thin and flexible, and with longitudinal stretch, in order that it also offers good handling and kink resistance to a surgeon. While the device is preferably of tubular form, flat sheets or other forms may also be made. The device includes inner and outer layers of a porous material having a microstructure of nodes interconnected by bent fibrils, and having void spaces between adjacent bent fibrils. The inner and outer layers are joined by an elastomeric adhesive that may interpenetrate the void spaces of the adjacent surfaces of the inner and outer layers, that is, the inner surface of the outer layer and the outer surface of the inner layer. Optionally, a middle layer of an elastomeric material may also be provided, joined to the inner and outer porous layers by the interpenetrating elastomeric adhesive. The device is preferably a vascular graft and more preferably a vascular graft for kidney dialysis.
摘要:
Methods and apparatus are provided for removing emboli during an angioplasty, stenting or surgical procedure comprising a catheter having an occlusion element, an aspiration lumen, and a blood outlet port in communication with the lumen, a guide wire having a balloon, a venous return sheath with a blood inlet port, and tubing that couples the blood outlet port to the blood inlet port. Apparatus is also provided for occluding the external carotid artery to prevent reversal of flow into the internal carotid artery. The pressure differential between the artery and the vein provides reverse flow through the artery, thereby flushing emboli. A blood filter may optionally be included in-line with the tubing to filter emboli from blood reperfused into the patient.
摘要:
The present invention provides improved methods for forming and mounting a sleeve on a catheter shaft in order to form a distensible balloon catheter. The balloon is formed from a distensible sleeve that is treated to render one or both of its ends essentially non-distensible. The balloon is mounted on the catheter shaft by the non-distensible ends, without compromising the distensible operative portion of the balloon. The balloon may also be mounted using non-distensible tape or similar means to achieve a similar result.
摘要:
This invention relates to the production of durably liquidproof laminates and articles made therefrom, the laminates incorporating at least one barrier layer and at least one fire resistant woven textile layer, the textile layer having a weight of about 2.5 ounces per square yard or less. Garments, protective covers and other protective articles incorporating this laminate are also described.
摘要:
A tamper respondent enclosure including (a) a circuit board; (b) an enclosure surrounding the circuit board; (c) a tamper respondent sensor having (i) a substrate with first and second sides; (ii) a first layer of conductive traces on the first side; (d) wherein the tamper respondent sensor is wrapped around the enclosure with at least one overlap region; and (e) wherein only at the at least one overlap region the tamper respondent sensor has a second layer of conductive traces on the second side. Preferably, the substrate is insulating and made of opaque PET, and the first layer is adjacent the enclosure.