Measurement of pressure of a fluid in a vessel using a cantilever spring in the vessel; a magnet connected to the cantilever spring in the vessel; an electromagnet outside of the vessel operatively connected to the magnet and the cantilever spring in the vessel, wherein the electromagnet induces movement of the magnet and the cantilever spring in the vessel, and wherein the movement is related to the pressure of the fluid in the vessel; a receiving coil operatively positioned relative to the magnet, wherein movement of the cantilever spring and the magnet in the vessel creates an electromotive response in the coil; and a controller analyzer connected to the receiving coil, wherein the controller analyzer uses the electromotive response in the coil for measuring the pressure of the fluid in the vessel.

Disclosed in the present invention are a capillary channel environmental sensor and a preparation method therefor. The capillary channel environmental sensor comprises a transfer cavity and at least one capillary channel. The cross sectional area of the transfer cavity is greater than the cross sectional area of the capillary channel, and one end of the capillary channel is connected with the transfer cavity; an elastic transfer diaphragm is provided between the transfer cavity and an external measurement environment. A positioned droplet is provided in the interior of the capillary channel, the positioned droplet is in tight contact with the inner walls of the capillary channel and the positioned droplet is in tight contact with a transfer medium. By means of the transfer cavity and the capillary channel that are connected to one another, because the cross sectional area of the transfer cavity is larger than the cross sectional area of the capillary channel, differences in volume between the transfer cavity and the capillary channel are used to transform a small displacement in a region of large volume into a large displacement in a region of small volume. Because the positioned droplet is provided in the capillary channel, and the capillary channel environmental sensor comprises a magnetic sensing element, the magnetic sensing element causes, on the basis of movement of the positioned droplet, the change in displacement through an intermediate variable to provide high-sensitivity and low-power detection.

The invention relates to a passive pressure sensor (501) for being introduced into the circulatory system of a human being and for being wirelessly read out by an outside reading system. The pressure sensor comprises a casing (502) with a diffusion blocking layer for maintaining a predetermined pressure within the casing and a magneto-mechanical oscillator with a magnetic object (508) providing a permanent magnetic moment. The magneto-mechanical oscillator transduces an external magnetic or electromagnetic excitation field into a mechanical oscillation of the magnetic object, wherein at least a part of the casing is flexible for allowing to transduce external pressure changes into changes of the mechanical oscillation of the magnetic object. The pressure sensor can be very small and nevertheless provide high quality pressure sensing.

An example printing fluid pressure sensor comprises a first pressurizable chamber having an inlet to receive a pressurized gas and a second chamber to receive a printing fluid. A flexible element is disposed in between the first and second chambers and is to retain a magnet. A first side of the flexible element forms a wall of the first chamber and a second side of the flexible element forms a of the second chamber to seal the first and second chambers. The example sensor further comprises a sensor to detect the position of a magnet relative to the sensor. The sensor is disposed outside of the first and second chambers.

Disclosed is a pressure detection device configured to detect pressure intensity in a sealed cavity of a cooking appliance, comprising: a pressure sensing assembly comprising a fixed part and a movable part, in which the movable part moves relative to the fixed part when a pressure change in the sealed cavity is sensed, so as to cause a sensing parameter of the pressure sensing assembly to change; and a detecting unit connecting with the pressure sensing assembly and can acquire the pressure intensity in the sealed cavity according to a current sensing parameter of the pressure sensing assembly. The pressure sensing assembly further comprises a flexible sealing sheet disposed at an open end of the body portion to seal the open end, and configured to be deformed towards the pressure chamber when an air pressure in the sealed cavity is greater than an air pressure in the pressure chamber.

An electrodynamic position transducer has a casing in which a membrane is clamped, the membrane with a portion of the casing defining at least one chamber of variable volume, a coil having at least one conductive track formed on a coil support, and an interaction element configured to interact magnetically with the coil as a result of a movement of the membrane, in such a way that self-inductance of the coil is variable depending on a relative position of the interaction element with respect to the coil. A circuit, coupled to the coil, provides electrical signals, a parameter of the electrical signals being indicative of the self-inductance of the coil. A hole or recess is formed in the coil support and is configured to receive the interaction element in such a way that one end of the interaction element is positionable flush with or beyond a turn of the coil.

Disclosed is a pressure gauge comprising a pressure sensor and a pressure transmitter connected upstream of the pressure sensor and having an isolation diaphragm enclosing a pressure receiving chamber. A hydraulic pressure transmission path is connected to the pressure receiving chamber and is filled with a pressure transmitting fluid that transmits the pressure acting on the outer side of the isolation diaphragm to the pressure sensor The pressure gauge allows functional impairments of the pressure gauge to be detected early without having to change the pressure acting on the outer side of the isolation diaphragm. The pressure transmitter comprises an electronically activatable deflection device which is designed in such a way that, when activated, it exerts a constant force deflecting the isolation diaphragm, on the isolation diaphragm, or on an element connected to the isolation diaphragm.

A wireless pressure sensing unit (20) comprises a membrane (25) forming an outer wall portion of a cavity and two permanent magnets (26,28) inside the cavity. One magnet is coupled to the membrane, and at least one magnet is free to oscillate with a rotational movement. At least one is free to oscillate with a rotational movement. The oscillation takes place at a resonance frequency, which is a function of the sensed pressure, which pressure influences the spacing between the two permanent magnets. This oscillation frequency can be sensed remotely by measuring a magnetic field altered by the oscillation. The wireless pressure sensing unit may be provided on a catheter (21) or guidewire.

A system for pressure measurement within a surgical system is disclosed. The system comprises a pressure sensitive disc in communication with at least one applied pressure a magnetic field generator for generating at least one first magnetic field, and at least one sensor for measuring at least one second magnetic field, wherein the at least one first magnetic field at least partially creates the at least second magnetic field; and wherein the at least one sensor produces signal indicative of the distance between the at least one sensor and the at least one second magnetic field.

The application describes devices, systems and methods related to an implantable device that is a stent or a heart valve. The implantable device includes a pressure sensor. The implantable device is for being introduced into a subject and for being wirelessly read out by an outside reading system. The pressure sensor comprises a casing with a diffusion blocking layer for maintaining a predetermined pressure within the casing and a magneto-mechanical oscillator with a magnetic object providing a permanent magnetic moment. The magneto-mechanical oscillator transduces an external magnetic or electromagnetic excitation field into a mechanical oscillation of the magnetic object, wherein at least a part of the casing is flexible for allowing to transduce external pressure changes into changes of the mechanical oscillation of the magnetic object.