116 results about "Interface pressure" patented technology

A method of operating a CPAP apparatus in which the interface pressure is controlled to rapidly drop at the start of expiration by an expiratory relief pressure (ERP) that is independent of instantaneous respiratory flow, following which the pressure rises to an inspiratory level at or shortly before the end of expiration, or at the onset of an expiratory pause, if any. The ERP is an increasing function of the inspiratory pressure. The expiratory pressure follows a template that is a function of the expected expiration time, the magnitude of the template being equal to the ERP. The current estimated proportion of expiration is determined by comparing the expiration time of the breath in progress to low-pass filtered expiratory durations measured for a number of the preceding breaths.

A device has four fundamental components: an enclosure, a soft seal, a vacuum system and a thermal energy system having a thermal energy contacting element. The device provides thermal energy therapy and negative pressure therapy device simultaneously and/or in conjunction to a patient. The device has a thermal energy system that is more efficient in thermal energy transfer and the soft seal decreases tissue interface pressure to obtain the desired soft seal effect.

A method and apparatus for applying a specified compressive force by a heat dissipation device for an integrated circuit are given, including placing the integrated circuit device onto a printed circuit board and then placing the heat dissipation device onto the integrated circuit device. The method includes tightening an actuation screw in a spring plate against a portion of the heat dissipation device. The actuation screw may be prevented from being tightened beyond a mechanical constraint corresponding to a pre-set calibration for the specific compressive force, which may be greater than or equal to a minimum compressive force corresponding to the greater of a minimum thermal interface pressure and a minimum contact interface pressure. Additionally, the specific compressive force may be less than or equal to a maximum pressure which may be exerted on the integrated circuit device.

An air inflatable mattress and mattress coverlet are provided for the prevention and treatment of decubitus ulcers (i.e., pressure sores or bedsores). The mattress incorporates a user selectable static or alternating air powered support surface for more uniformly redistributing pressure exerted on a patient's skin. The mattress coverlet encompasses a low air loss feature independent of the mattress's user selectable air powered support surface. Such low air loss feature provides a patient contact surface exhibiting a high moisture vapor transfer ratio in conjunction with a forced air flow to aid in reducing the moisture and heat near the patient's body. Both the mattress and mattress coverlet are driven by an external control system which houses the user controls, as well as the necessary pumps, regulators, and valving.

<heading lvl="0">Abstract of Disclosure</heading> A cushioning device for a body support such as a mattress, seat, sofa, or the like where support is obtained from a fluid. The cushioning device is self-inflating, self-adjusting, and provides a low interface pressure under the entire contact surface of a patient. Shear force scraping damage is prevented by a sleeve apparatus. A support system apparatus provides separately adjustable pressure support zones. For physical therapy, an alternating pressure system provides alternating lifting and lowering pressure zones under a patient.

The invention relates to a high-reliability high-stability-degree hollow rotating traveling wave ultrasonic motor, which belongs to the technical field of the small and special motor. The ultrasonic motor comprises an encloser, a rotor, friction material, a stator, piezoelectric ceramic, a stator seat, a bearing, a dust cover for the bearing, and a loading nut. The motor disclosed by the invention is supported by one bearing, an anti-redundancy structure is designed, and the motor rotor and the stator seat are made of stainless steel material with the coefficient of linear expansion similar to that of the bearing. The situations that the revolving speed fluctuation quantity of the ultrasonic motor is raised, and the moment output performance is lowered, and the service life of the ultrasonic motor is shortened due to a plurality of factors can be effectively improved, wherein the factors comprise that the pressure distribution of the contact interface of the stator and the rotor is uneven due to double-end bearing supporting, more mutually-cooperated sizes and big deviation of machining and assembling of the ultrasonic motor; abrasive dust generated by motor working enters the bearing; the coefficients of linear expansion of materials are in a great difference under the high temperature and low temperature working conditions; and a fit clearance is changed.

The invention relates to a cable cold shrink intermediate joint interface pressure measuring apparatus and method thereof. The apparatus includes a plurality of pressure sensors, a signal acquisition unit, and a data processing unit, the pressure sensors are pre-embedded in the cross-linking polyethylene insulation surface on the starting side of the cold shrink tube of a cable cold shrink intermediate joint and is corresponding to the middle parts of the core-pulling silicone rubber of the cold shrink tube and the cross-linking polyethylene interface, the pressure sensors are equally spaced in the same circumference, the signal acquisition unit reads the electrical signals generated by the pressure sensors in real time during the cable normal running process and transmits the electrical signals to the data processing unit, and the data processing unit obtains the interface pressure value of the cable cold shrink intermediate joint according to the preset corresponding relation between the electrical signals and the pressure values. According to the invention, the direction measurement of the cable cold shrink intermediate joint interface pressure is realized, and the errors brought by the indirect measurement can be prevented, so that the accuracy of the measurement result can be effectively improved.

The invention discloses a cross-layer cooperative detection method of a DDoS attack based on an SDN for improving the detection efficiency of the DDoS attack. The technical scheme is as follows: constructing cross-layer collaborative detection architecture based on the SDN composed of a data layer and a control layer, wherein a data path, a switch proxy, a DDoS attack sensing module and a featureextraction module are arranged on an SDN switch of the data layer; and a controller proxy, an event manager, a DDoS attack classification module and a botnet tracing module are arranged on an SND controller of the control layer. The data layer performs coarse granularity detection on the data traffic to obtain DDoS attack abnormal traffic data, and the control layer performs fine-grained detectionon the abnormal traffic data of the DDoS attack. According to the cross-layer cooperative detection method disclosed by the invention, by means of the cooperation of the data layer and the control layer, the problems of large southbound interface pressure of the SDN and overlarge pressure of the SND controller are solved, the type of DDoS attack can be detected, and a switch set close to a botnetcan also be detected, so that the speed and accuracy of detecting the DDoS attack are improved.

The invention discloses a fully automatic interface pressure measuring method and device, a computer device and a storage medium. The method comprises the following steps of: calling a pre-configuredrestart script to restart a server; the pre-configured pressure test script is called to test the service performance and pressure test interface performance of the restarted server and obtain the target pressure test result. The performance analysis rules corresponding to the service performance and the pressure measurement interface performance are adopted to analyze the target pressure measurement results and obtain the target analysis results. The pressure test interface whose target analysis result is test failure is positioned for error and the test failure module is obtained. The targetpressure test results, the target analysis results and the test failure module are filled into the corresponding test report template to obtain the test report, so as to solve the problem that the manual analysis of pressure test results takes a long time.

A telemedical interface pressure monitoring system is provided for intermittent or continuous monitoring of the pressure that occurs at the interface between the body and a support surface such as with a compression device, cast or resting surface. The system simultaneously measures interface pressure at multiple compression positions as well as provide real-time measurement data to both patients and clinicians. The system uses an array of one or more sensors and a data collection and transmission node with a microprocessor and transmitter/receiver that transmits the sensor data to a receiver such as a mobile device or cloud or clinic server for remote display, evaluation and automatic recording. Remote receivers can also control compression devices associated with the node.

Methods for detecting a patient disconnecting from a continuous positive airway pressure (CPAP) therapy device are disclosed. A cyclical pressure difference signal is derived based upon measurements from a patient interface pressure sensor and from a source pressure sensor. The pressure difference signal is integrated to generate a resultant integral signal for each respiratory cycle, which is comprised of at least one inspiratory phase and at least one expiratory phase as represented by the corresponding portions of the pressure difference signal. A pressure source of the CPAP therapy device is deactivated in response to a disconnect condition being evaluated from the integral signal. In one embodiment, the disconnect condition is the integral signal exceeding a predefined disconnect threshold. In other, it is a slope value corresponding to a rate of increase of the integral signal exceeding a predefined threshold for a predefined duration.

A pressure indicator for a motor vehicle (or other) fuel tank, that will indicate when pressure at the cap/container interface or vapor pressure in the tank drops below a predetermined level, which will normally mean that the fuel cap is not tightly secured to the tank's opening. The cap/container interface or vapor pressure will be detected by sensors in a rubber gasket (either in the cap or in the tank's opening that the cap fits over) or in a washer for the fuel cap. When the sensors detect a pressure below the predetermined level, BLUE TOOTH (or other appropriate) technology will be used to send a signal to a receiver (preferably in a key ring attachment) that will cause a red light to flash (or other appropriate visual, audio or tactile notice). The light may also flash when the cap is temporarily removed for refueling.

It is disclosed foam mattresses or toppers, and methods of using them, comprising a top surface defining lateral deflective areas thanks to structural modifications of the foam comprising a plurality of slots, grooves, voids or channels. The invention (mattresses, toppers or methods) allows controlling postural alignment while providing ultra-low mattress-body interface pressures for all body areas regardless of recumbent position. The method comprises the step of providing into a core section of the mattress a plurality of structural modifications comprising slots, and/or voids, to form transversal deflective areas into the mattress. The invention is preferably achieved by CNC (Computer Numerical Control) cutting the structural modifications (channels, slots and voids) into the mattress foam which support each area of the body. It is also disclosed mattresses or toppers in which foam inserts are kept or removed from the channels to modulate the deflections on one or both sides of the mattress.

There is provided an inexpensive rolling element used under high interface pressure such as induction hardened gears, the rolling element being improved in the seizure resistance of its tooth flanks and having a temper hardness of HRC 50 or more at 300° C. To this end, the rolling element is made from a steel material containing at least 0.45 to 1.5 wt % C and one or more alloy elements selected from 0.1 to 0.5 wt % V and 0.3 to 1.5 wt % Cr, and has a rolling contact surface layer having a structure tempered at low temperature in which 2 to 18% by volume cementite disperses in a martensite parent phase formed by induction heating and cooling and containing 0.25 to 0.8 wt % carbon solid-dissolving therein.

The invention discloses an interface pressure distribution testing sensing element. The interface pressure distribution testing sensing element comprises a sensing film, electrodes uniformly arranged around the sensing film at intervals, a lead connected with the electrodes and an upper and lower insulating paint layer. The sensing film is made from a conductive polymer composite material provided with a piezo-resistive sensitivity characteristic, and the electrodes and the lead are used for outputting resistivity information of the sensing film in different positions. When in testing, the lead is connected with a testing instrument, the electrical impedance imaging technology is used for acquiring, testing and computing so as to obtain the resistivity distribution of the sensing film in different positions, and then the pressure distribution can be obtained through the relationship between the sensing film pressure and the resistivity. The interface pressure distribution testing sensing element can be used for measuring the interface pressure distribution and change, and has the advantages of simple structure, ultra-thin film, strong flexibility, high resolution and precision, large measuring range and low cost.

The invention aims to provide a safety valve type underwater fixed-depth releasing device, which comprises a filter, a safety valve and a releasing mechanism, wherein the filter is fixed at the water inlet of the safety valve; the water outlet of the safety valve is connected with the releasing mechanism; a tacking bolt is pressed against a bearing bar; the bearing bar is used for bearing pressure load on both sides; an adjusting screw cap can be moved up and down on the outer surface of a lower valve body through a screw thread, and the pressure of the safety valve can be adjusted by adjusting a pressure regulating spring; the adjusting screw cap is connected with the lower valve body through a screw thread, the adjusting screw cap and the lower valve body are sealed through a sealing ring, and a locking nut can be used for preventing the adjusting screw cap from rotating freely; an upper valve body is connected with a valve body interface through a taper thread and is wound with a thread seal tape for sealing; the valve body interface is sealed with an upper cover through a sealing ring, and an interface pressure plate is used for compressing the valve body interface onto the upper cover through a bolt; the sealing cover is used for performing end face static seal between the sealing ring and the upper cover, and limiting a steel ball from rolling outwards. The safety valve type underwater fixed-depth releasing device is high in loading bearing capacity, light in weight, small in size and easy to install.