摘要:
A device for controlling the flow of a liquid or gaseous medium, has at least one flow opening for the medium, and a movable valve element for controlling the flow opening. At least one damping body, which is preferably viscoelastic and acts on the valve element, is provided for obtaining a large dynamic range of the device in order to control flow in a fine, precise, and oscillation-free manner across a broad range of flow volume.
摘要:
A device for controlling the flow of a liquid or gaseous medium, has at least one flow opening for the medium, and a movable valve element for controlling the flow opening. At least one damping body, which is preferably viscoelastic and acts on the valve element, is provided for obtaining a large dynamic range of the device in order to control flow in a fine, precise, and oscillation-free manner across a broad range of flow volume.
摘要:
Equipment is disclosed for the controlled insufflation of a fluid into a body cavity through a probe inserted thereinto, particularly for insufflating gas through the conduit of an endoscope partly inserted into the body cavity. The equipment comprises a supply device for delivering the fluid and on which a selected nominal value for the pressure in the body cavity can be set and the relevant actual value of the body cavity pressure can be displayed by means of a measuring instrument. The inlet side of a circulating pump, is connected by way of a filter to the body caviy. During an operation the pump draws off fluid from the body cavity and circulates it back to the body cavity. Part of the circuit on the delivery side of the pump and part of the circuit leading to the measuring instrument have a common portion leading to the body cavity. When the pump is running, therefore, a retroactive dynamic pressure is applied to the measuring instrument. The dynamic pressure is compensated for by a partial vacuum derived from the delivery flow of the pump.
摘要:
A device for a flow control of a liquid or gaseous medium, in particular for metering a fluid to be admixed into an exhaust gas treatment system, contains an electromagnet which has a solenoid coil with a magnetic core and an end-side magnetic plate in a magnet housing, and actuates a valve element in a valve compartment of a valve body to control a valve seat located there. The solenoid coil is protected against deformation with respect to the valve compartment, and is sealed using a sealing device.
摘要:
In the sealed interior of an image-generating recording or transmitting device, for example an endoscope, videoscope, endo-technoscope or the alike, there is provided at least one sensor which responds to minute changes in atmospheric humidity. The actual value of the humidity is compared by an electronic monitoring device with a maximum admissible limit humidity value. If the actual humidity value reaches a preselectable limit value range, an analog signal is displayed and, if the maximum admissible limit value is exceeded, a signal is generated to actuate an air pump to load the interior of the recording and/or transmitting device with excess air pressure.
摘要:
A video endoscope has a strobe lamp operable in a mode wherein the strobing is synchronized to a selected tone or a periodic vibration in a patient, such as from the vocal cords, and is alternatively operable in a mode wherein the strobing is so rapid so as to appear as a substantially continuous light source. In the second mode, wherein the resulting image is to be displayed by a video system, the trigger circuit for operating the lamp is supplied with the video signal so that the lamp is triggered during either the horizontal or vertical blanking interval so that triggering of the strobe lamp does not cause interference in the video picture.
摘要:
A device for monitoring the functionality of a valve includes the valve, a digital diagnostic module and a programming device. The valve has a sensor actuator connected to a valve element for combined reciprocating motion, a distance sensor that interacts with the sensor actuator to generate analog distance values characterizing lift positions of the valve element. The diagnostic module diagnoses switching states of the valve element based on the distance values and, includes an analog input connected to the distance sensor, a downstream A/D converter and a serial communication connected to a digital input/output. The serial communication enables threshold values for the digital distance values that define changes to the switching state to be programmed by the programming device and transmission of diagnosed switching states.
摘要:
A device for the flow control of a liquid or gaseous medium has a valve element which controls at least one flow opening for the medium, and an electromagnet which actuates the valve element and has a magnetic circuit having at least one excitation coil and a solenoid armature coupled to the valve element. To markedly reduce the start-up power for the excitation coil, the solenoid armature is disposed between two diametrically opposed pole pieces located in the magnetic circuit, such that it can swivel about a swivel axis, and is designed such that it extends beyond each pole piece, leaving two air gaps. At least one permanent magnet is disposed in the solenoid armature in a manner such that the magnetic flux thereof closes by way of the pole pieces.
摘要:
A device is disclosed for the disintegration of concretions in body cavities. The device comprises at least one piezoelectric transducer element, for connection to a generator. The transducer element is connected between a reflector and a horn. Ultrasonic waves generated by the transducer element are directed by means of a sonotrode, to a concretion to be destroyed. At least the horn is provided with surface depressions which do not run parallel to its axis of symemtry, for the generation of transverse and rotational oscillations.
摘要:
Apparatus for introducing fluids into, and withdrawing fluids from, a hollow organ of the body, in particular a galibladder, for conducting litholysis, comprises a piston-type injection device having a multi-directional valve and which can be removably inserted into an operating mechanism. The injection device has a chamber located in front of its piston and serving as a settling chamber for a mixture of organ secretion and stone sludge removed with the solvent from the hollow organ. The valve is for the sequential connection of the pressure chamber to the hollow organ, to a tank for the solvent, and to a receiving vessel for fluid drawn off.