Specification for Crosslinked Polyethylene/Aluminum/Crosslinked Polyethylene Tubing OD Controlled SDR9

10.1520/f2262 ◽  
2018 ◽  
Author(s):  
Keyword(s):  
Polyethylene Tubing

Platelet Accumulation on Fibrin-coated Polyethylene: Role of Platelet Activation and Factor XIII

1995 ◽  
Vol 73 (05) ◽  
pp. 850-856 ◽  
Author(s):  
F D Rubens ◽  
D W Perry ◽  
M W C Hatton ◽  
P D Bishop ◽  
M A Packham ◽  
...  
Keyword(s):  
Factor Xiii ◽  
Cross Linking ◽  
Internal Diameter ◽  
Static System ◽  
Graft Occlusion ◽  
Platelet Binding ◽  
Coated Surface ◽  
Platelet Accumulation ◽  
Polyethylene Tubing

SummaryPlatelet accumulation on small- and medium-calibre vascular grafts plays a significant role in graft occlusion. We examined platelet accumulation on the surface of fibrin-coated polyethylene tubing (internal diameter 0.17 cm) during 10 min of flow (l0ml/min) at high wall shear rate (764 s-1). Washed platelets labelled with 51Cr were resuspended in Tyrode solution containing albumin, apyrase and red blood cells (hematocrit 40%). When the thrombin that was used to form the fibrin-coated surface was inactivated with FPRCH2C1 before perfusion of the tubes with the platelet:red blood cell suspension, the accumulation of platelets was 59,840 ± 27,960 platelets per mm2, whereas accumulation on fibrin with residual active thrombin was 316,750 ± 32,560 platelets per mm2 (n = 4). When the fibrin on the surface was cross-linked by including recombinant factor XIII (rFXIII) in the fibrinogen solution used to prepare the fibrin-coated surface, platelet accumulation, after thrombin neutralization, was reduced by the cross-linking from 46,974 ± 9702 to 36,818 ± 7964 platelets per mm2 (n = 12, p <0.01). Platelet accumulation on tubes coated with D-dimer was ten times less than on tubes coated with D-domain; this finding also supports the observation that cross-linking of fibrin with the formation of γ-γ dimers reduces platelet accumulation on the fibrin-coated surface. Thrombin-activated platelets themselves were shown to cross-link fibrin when they had adhered to it during perfusion, or in a static system in which thrombin was used to form clots from FXIII-free fibrinogen in the presence of platelets. Thus, cross-linking of fibrin by FXIII in plasma or from platelets probably decreases the reactivity of the fibrin-containing thrombi to platelets by altering the lysine residue at or near the platelet-binding site of each of the γ-chains of the fibrinogen which was converted into the fibrin of these thrombi.

scholarly journals Thrombus Formation on Indwelling Venous Cannulae in Sheep: Effects of Time, Size and Materials

1976 ◽  
Vol 4 (3) ◽  
pp. 217-224 ◽  
Author(s):  
H. G. Spanos ◽  
J. F. Hecker
Keyword(s):  
Surface Area ◽  
Thrombus Formation ◽  
Polyethylene Tubing

Three experiments were performed to measure thrombus formation on plastic cannulae inserted by cut-down into veins of sheep. On polyethylene tubing, considerable thrombus was present after one day and the amount increased in the subsequent 13 days. When different sized polyethylene tubings were tested, thrombus tended to form in relation to the surface area. Smaller tubings had smaller proportions of their lengths covered with thrombus. There were differences between types of plastics with one batch of polyvinylchloride tubing being virtually non-thrombogenic.

Long term durability of crosslinked polyethylene tubing used in chlorinated hot water systems

1999 ◽  
Vol 28 (6) ◽  
pp. 309-313 ◽  
Author(s):  
T.S. Gill ◽  
R.J. Knapp ◽  
S.W. Bradley ◽  
W.L. Bradley
Keyword(s):  
Water Systems ◽  
Hot Water ◽  
Polyethylene Tubing

SIMPLE STERILIZATION OF POLYETHYLENE TUBING

1956 ◽  
Vol 17 (6) ◽  
pp. 830-830
Author(s):  
Armando Fortuna
Keyword(s):  
Polyethylene Tubing

Determination of Methanol Concentration in Ethanol in Liquid Phase by a Phononic Crystal Mach-Zehnder Interferometer

2021 ◽  
Author(s):  
Aysevil Salman Durmuşlar ◽  
Emine Ates ◽  
Ahmet Biçer ◽  
Sualp Deniz ◽  
Ahmet Cicek ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Liquid Phase ◽  
Volume Fraction ◽  
Phononic Crystal ◽  
High Sensitivity ◽  
Zehnder Interferometer ◽  
Pure Ethanol ◽  
Interferometric Sensor ◽  
Polyethylene Tubing

Abstract A practical and portable ultrasonic interferometric sensor to detect methanol concentration in ethanol in the liquid phase is numerically investigated. For high-sensitivity operation, the sensor is designed as a Mach-Zehnder interferometer based on a linear-defect waveguide in a two-dimensional phononic crystal, which consists of square array of cylindrical steel rods in water. The waveguide core comprises polyethylene tubing, impedance-matched with water, filled with either pure ethanol or ethanol-methanol binary mixture, allowing fast replacement of the analyte. Band structure analyses through the finite-element method are carried out to obtain guiding modes at frequencies around 200 kHz. With 50x21 cells with 4.2 mm periodicity, the total sensor area is 210-by-88.2 millimeters, which can be significantly reduced by increasing the operating frequency to megahertz range. The interferometer is constructed via T junctions of the waveguide, which facilitates low-loss equal splitting and recollection of ultrasonic waves. Sample and reference wave paths are constructed by filling polyethylene tubing on the upper and lower halves of the interferometer with the ethanol-methanol mixture and pure ethanol, respectively. Frequency-domain finite-element method simulations reveal that the sensor output is characterized by several transmission peaks, one of which is centered at 203.35 kHz with a full-width at half-maximum of 20 Hz, resulting in a quality factor of 10167. The peak frequency of this peak redshifts at a rate of 7.24 Hz per percent volume fraction change in methanol. The peak shift is linear when the methanol volume fraction is below 10%. Besides, the interferometric sensor has a figure of merit around 0.35. The proposed ultrasonic sensor offers rapid detection of methanol content in ethanol with high sensitivity.

Etherőair anesthesia for small experimental animals

1964 ◽  
Vol 19 (4) ◽  
pp. 827-828
Author(s):  
F. W. Walker
Keyword(s):  
Partial Pressure ◽  
Compressed Air ◽  
Vapor Concentration ◽  
Partial Pressure Of Oxygen ◽  
Inhalation Anesthesia ◽  
Flow Rates ◽  
Experimental Animals ◽  
Anesthetic Apparatus ◽  
Polyethylene Tubing

An apparatus using compressed air for the semiquantitative administration of ether-air mixtures to experimental animals has been constructed in quantity from bottles, polyethylene tubing, and roller clamps available from hospital discard. Ether concentrations at various flow rates can be derived from the depression of the partial pressure of oxygen in the ether-air mixture. Inexpensive and useful in research, the apparatus also acquaints the student with the quantitative aspects of inhalation anesthesia. anesthetic apparatus for experimental animals; ether vapor concentration calculated from pO2 in ether-air mixtures Submitted on June 10, 1963

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