Abstract:
A method and system provide a surgical system including a cassette, a console and an interferometric pressure sensing system coupled with the console. The cassette is for exchanging material with a patient and includes a wall and a reflector. The wall undergoes a deflection in response to a nonambient internal cassette pressure. The console is coupled with the cassette. The interferometric pressure sensing system is coupled with the console. The interferometric pressure sensing system includes a light source and a detector. The light source provides a first portion of light that is reflected off of the reflector and a second portion of light that bypasses the reflector. The first portion and the second portion of light are recombined to form an interference pattern. The deflection corresponds to a shift in the interference pattern detectable by the detector.
Abstract:
In accordance with one aspect, a device is provided having a transducer comprising a conductor, a diaphragm configured to move relative to the conductor, and a reference volume in communication with the external environment. The diaphragm separates the reference volume and the external environment. The device further includes a controller operably coupled to the transducer and configured to determine an air pressure of an external environment based at least in part on movement of the diaphragm.
Abstract:
Disclosed is an implant and method of making an implant. The implant having a housing that defines a cavity. The housing includes a sensor comprising a base attached to a diaphragm wherein said base may be positioned within said cavity. The sensor may be a capacitive pressure sensor. The diaphragm may be connected to the housing to hermetically seal said housing. The sensor may include electrical contacts positioned on the diaphragm. The base may define a capacitive gap and a vent wherein the electrodes may be positioned within said capacitive gap such that at least a portion of the electrical contacts extend through the vent. The implant may include a coil in electric communication with the sensor, said coil may be positioned within said housing. A printed circuit board having at least one component may be attached to the floating base.
Abstract:
Differenzdrucksensor zur Bestimmung eines Druckmesssignals, umfassend: eine im Wesentlichen ein Halbleitermaterial aufweisende Differenzdruckmesszelle, welcher ein erster und ein zweiter Druck zuführbar ist und welche mit Hilfe eines elektrischen Wandlerelementes in Abhängigkeit einer Differenz zwischen dem ersten und dem zweiten Druck das Druckmesssignal ausgibt; einen ersten, vorzugsweise eine Keramik oder ein Halbleitermaterial, aufweisenden Versteifungskörper, der mit der Differenzdruckmesszelle mittels einer ersten Fügeschicht gefügt ist und einen ersten Kanal aufweist, über den der erste Druck der Differenzdruckmesszelle zuführbar ist; einen zweiten, vorzugsweise eine Keramik oder ein Halbleitermaterial, aufweisenden Versteifungskörper, der mit der Differenzdruckmesszelle mittels einer zweiten Fügeschicht gefügt ist und einen zweiten Kanal aufweist, über den der zweite Druck der Differenzdruckmesszelle zuführbar ist; wobei die erste und/oder die zweite Fügeschicht ein elektrisch leitfähiges, vorzugsweise metallisches Material aufweist und die erste und/oder zweite Fügeschicht neben der mechanischen Verbindung der Differenzdruckmesszelle mit dem ersten bzw. zweiten Versteifungskörper auch zur Realisierung einer elektrischen Funktionalität dient.
Abstract:
A pressure sensor includes a piezoelectric substrate having a generally planar structure and an anchor location fixing the piezoelectric substrate at the periphery of the planar structure of the piezoelectric substrate. The planar structure of the piezoelectric substrate has a first region having a first characteristic thickness adjacent to the anchor location, and a second region have a second characteristic thickness at a middle region of the substrate. The second characteristic thickness is less than the first characteristic thickness such that the planar structure in the second region is displaced relative to the neutral axis of the planar structure such that while undergoing bending the second region has either mostly compressive or mostly tensile stress.
Abstract:
Pressure sensors having ring-tensioned membranes are disclosed. A tensioning ring is bonded to a membrane in a manner that results in the tensioning ring applying a tensile force to the membrane, flattening the membrane and reducing or eliminating defects that may have occurred during production. The membrane is bonded to the sensor housing at a point outside the tensioning ring, preventing the process of bonding the membrane to the housing from introducing defects into the tensioned portion of the membrane. A dielectric may be introduced into the gap between the membrane and the counter electrode in a capacitive pressure sensor, resulting in an improved dynamic range.
Abstract:
A flip chip pressure sensor assembly. The flip chip pressure sensor assembly comprises a substrate; a pressure sensor die comprising a sensing diaphragm, the die having a top side and a bottom side that is reverse to the top side, where the top side of the die is electrically connected to the substrate by flip chip mounting technology; a cover defining an aperture disposed over the pressure sensor die, where the aperture defined by the cover aligns with the sensing diaphragm to provide a path for pressure to be transmitted through the aperture to the bottom side of the sensing diaphragm; and a gel disk disposed within the aperture in intimate contact with a bottom side of the sensing diaphragm, where the gel disk is domed above an outer shoulder of a rim defined by the cover.