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English to Chinese: Patent: Medical: Polymer General field: Law/Patents Detailed field: Medical (general)
Source text - English DESCRIPTION
CROSS-REFERENCE TO RELATED PATENT APPLICATIONS
1. "BLOOD VESSEL PATCH", Ser. No. 07/358,785, filed concurrently herewith, naming Berguer et al. as inventors, and assigned to the assignee of the present invention.
2. "LONGITUDINALLY COMPLIANT PTFE GRAFT", Ser. No. 07/358,011, filed concurrently herewith, naming Della Corna et al. as inventors, and assigned to the assignee of the present invention, now issued as U.S. Pat. No. 4,955,899.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to prosthetic vascular grafts for implantation within the vascular system of a patient, and more particularly, to a prosthetic vascular graft made from expanded, porous polytetrafluoroethylene (PTFE) tubing that is fabricated to retain the porous inner cylindrical wall of conventional PTFE vascular grafts, but wherein the outer cylindrical wall of the PTFE tube is rendered non-porous over at least a portion of its length.
2. Description of the Prior Art
The use of implantable prosthetic vascular grafts made of expanded, porous PTFE is well known in the art. Such vascular grafts are often implanted just below the skin to provide blood access for long term hemodialysis. Such PTFE vascular grafts are also used to replace or bypass occluded or damaged natural blood vessels. Such prosthetic vascular grafts, and methods of implanting the same, are generally described in Bennion et al., "Hemodialysis and Vascular Access", Vascular Surgery, pp. 625-662, 1983. Methods of forming expanded, porous PTFE tubing are well known in the art. For example, U.S. Pat. No. 4,187,390 issued to Gore discloses one such process which may be used to produce highly porous, expanded PTFE structures.
Expanded, porous PTFE material offers a number of advantages when used as a prosthetic vascular graft. PTFE is highly biocompatible, has excellent mechanical and handling characteristics, does not require preclotting with the patient's blood, heals relatively quickly following implantation, and is thromboresistent. Notwithstanding its many advantages, certain problems may arise with the use of PTFE vascular grafts. For example, PTFE material is not very elastic, and the suture holes formed in the ends of the graft when the graft is sutured to a blood vessel during implantation often leak blood until clotting occurs within the suture holes. Moreover, while porous PTFE vascular grafts are generally impermeable to blood, instances have arisen wherein serous weepage has occurred; serous weepage arises when the watery portion of the blood passes through the wall of the PTFE vascular graft and forms a collection of fluid, known as a seroma, adjacent the outer wall of the vascular graft. Additionally, instances have arisen wherein sutures used to secure the ends of PTFE vascular grafts to blood vessels within the body have torn the wall of the PTFE vascular graft, causing failure thereof.
English to Chinese: Chemical analyzing equipment discription General field: Tech/Engineering Detailed field: Biology (-tech,-chem,micro-)
Source text - English Biofuels
The XXX enzyme electrode technology provides accurate one-minute results with minimal sample preparation. In biofuel production plants and in biofuel research labs the XXX 2700 has proved to complement HPLC analysis. The XXX has proven to be a very useful and cost-effective tool in monitoring applications from residual ethanol in beer bottoms to monitoring xylose and glucose in saccharification and fermentation studies. Users cite ease of use and simplicity of maintenance, along with accurate results, as key advantages of the XXX technology to help maintain ethanol production efficiency in plants; and to more quickly evaluate parameter changes in cellulosic bioethanol research studies.
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Measure key analytes in biofuel production and research. Choose single or dual chemistry model. Analytes include glucose, lactate, ethanol, xylose and more.
XXX 2950 Biochemistry Analyzer
Simultaneously measure 6 key analytes. Popular combination is glucose, lactate, ethanol and xylose. 96 well plates for batch sampling.
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XXX offers several products for on-line monitoring and control of key analytes in cell culture bioreactors. The original XXX 2700M offers a cost-effective, simple method for monitoring (and with the addition of a feed pump, control). XXX has collaborated with YYY to provide solutions for your more complex monitoring and control applications.
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