Compression devices

ABW adjusted body weight IPC intermittent pneumatic compression (device)... 

Deep vein thrombosis prophylaxis is recommended for septic patients. Low-dose unfractionated heparin or low-molecular-weight heparin may be utilized. Graduated compression stockings or an intermittent compression device is recommended for patients with a contraindication to heparin products (thrombocytopenia, severe coagulopathy, active bleeding, or recent intracerebral hemorrhage).24... 

Nonpharmacologic methods improve venous blood flow by mechanical means and include early ambulation, electrical stimulation of calf muscles during prolonged surgery, graduated compression stockings, intermittent pneumatic compression devices, and inferior vena cava filters. 

Take a compression device, a combustion chamber, an expander, and a cooler from the closed-system inventory shop and connect the four devices to form the Otto cycle as shown in Fig. 3.2. 

Input the given information (1) working fluid is air, (2) inlet pressure and temperature of the compression device are lOOkPa and 27°C, (3) compression ratio of the compression device is 8, (4) heat addition is 700kJ/kg in the combustion chamber, and (5) m = 0.01 kg. 

Assume a process for each of the four devices (1) compressor as adiabatic with efficiency of 85%, (2) combustion chamber as isobaric, (3) turbine as adiabatic with efficiency of 89%, and (4) heat exchanger as isobaric on both hot and cold sides. Input the given information (1) working fluid is air, (2) inlet pressure and temperature of the compression device are 14.7 psia and 60°F, (3) inlet pressure and temperature of the turbine are 120 psia and 2000°F, (4) mass flow rate of air is 1 Ibm/sec, (5) exit pressure of the turbine is 14.7 psia, (6) display the exit temperature of the compressor (it is 562.5°F), and (7) input the exit temperature of the exhaust turbine gas... 

Fabrication of the Infusion Device. The external rigid casing of the compression device was made from 2.5 mm thick plastic sheets, preferably optically clear. The leak-proof inflatable sacs were made by heat sealing of heavy-duty polyethylene sheets which also had good optical clarity and at the same time were resistant to swelling when in contact with an aerosol propellant. 

Figure 1. Sketch of the disposable compression device using a clinical PVC drug solution container as the reservoir. The propellant is in the cylindrical tube.

Table II. Delivery Rate from a 250-mL Capacity Solution Container by the Compression Device...

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