4023 results about "Axial displacement" patented technology

A device and method for treating cardiac valve regurgitation. The device includes a tubular member including a lumen there through and a locking mechanism and a compression device carried on the tubular member. The compression device is transformable to a compression configuration in response to axial displacement and is locked in the compression configuration by the locking mechanism. The method includes positioning the compression device adjacent a cardiac valve and applying an axial displacement to the compression device to transform the compression device into a compression configuration and locking the compression device in the compression configuration to apply a compressive force to the cardiac valve.

A method for motion estimation within biological tissue is disclosed. The method involves acoustically coupling a transducer to a target biological tissue, which transducer emits an ultrasonic signal and collects the energy back-scattered by the target issue. A first set of energy data is collected and stored, then target tissue is axially compressed and a second set of ultrasonic energy data is collected and stored. One of the first and second data sets is warped to account for the anticipated compression forming a warped data set. This warped data set is cross-correlated with the unwarped one of the first and said second data sets to obtain a fine scale displacement of said target biological tissue from the displacement estimated by the warping. This fine scale displacement is summed with the warped data set to obtain a total axial displacement. A gradient of the total axial displacement is taken and used to form a strain image. An apparatus for practicing this method is also disclosed.

An endovascular graft which is configured to conform to the morphology of the vessel to be treated and which is made from an inflatable structure having a proximal end with a proximal inflatable cuff and a distal end with a distal inflatable cuff. At least one elongated inflatable channel is disposed between and in fluid communication with fluid tight chambers of the inflatable cuffs which may contain rupture discs therebetween which can be configured to rupture at different pressures. A thin flexible barrier disposed between the inflatable cuffs and the elongated inflatable channel of the frame so as to form a tubular structure defining a longitudinal channel to confine a flow of blood or other fluid therethrough. The graft may also have an expansion member attached to the proximal end of the graft which is preferably made of linked expandable rings of pseudoelastic shape memory alloy which is self expanding and prevents axial displacement of the graft once it is deployed.

A correlator system for automatic car wash has roller assemblies for supporting the front left and right wheels of a vehicle entering a car wash line. A set of guide rails or bars cooperate with the roller assemblies to adjust axial displacement and angular misalignment between the vehicle's front end and a conveyor track transporting the vehicle through the car wash facility. The rollers in the roller assembly rotate freely with minimal friction, axially displacing the front end of the vehicle and adjusting the angular misalignment of the front wheels. The low friction, easy-to-rotate rollers are provided with a plurality of braking elements that generate friction against the rollers, retarding their rotation when a worker steps thereon. The friction generated by the braking elements is insufficient to prevent roller rotation during alignment of the front end with the conveyor track. Injuries to car wash personnel caused by loss of balance when stepping on the rollers are virtually eliminated, and an accurate alignment of the vehicle's front end with the car wash conveyor track is reliably achieved.

The invention provides a rock high-pressure permeability test system, comprising a sample depression box device which is provided with a heavy frame inside, a hydraulic jack positioned inside the heavy frame, a movable trolley positioned on the top of the hydraulic jack, and a triaxial depression box fixed on the movable trolley, wherein, the triaxial depression box comprises a confining pressure chamber body, a depression box base with an seepage water inlet and a confining pressure water inlet, a lower actuating post system which is positioned on the depression box base and is communicated with the seepage water inlet and a seepage water channel on the sample, an upper actuating post system of the seepage water outlet which is positioned on the top of the depression box and is communicated with the seepage water channel on the sample. The test system is provided with an oil-water converting dynamic control system which is connected with the hydraulic jack, the seepage water inlet and the confining pressure water inlet respectively. The invention can test the permeability of the sample under various conditions, conventional triaxial mechanical characteristics of various loading paths, the seepage at a high permeability pressure, and the stress coupling process and can control the shaft pressure, the confining pressure, the permeability pressure and the axial displacement accurately.

A reciprocating compressor driven by a linear motor, comprising a shell, within which are mounted: a reference assembly formed by a motor and a cylinder (1); a resonant assembly formed by a piston (2) reciprocating inside the cylinder (1), and by an actuating means (3) operatively coupling the piston (2) to the motor; two spring means (10) mounted to the resonant assembly and to the reference assembly and which are elastically and axially deformed in the displacement direction of the piston (2); a mounting element (40) coupling an end of one spring means (10) to an end of the other spring means (10); and a coupling element (50) mounted to the piston (2) and to the mounting element (40), which is axially displaced together with the piston (2) and displaced freely and transversally to the displacement direction of the piston (2), said coupling element (50) transmitting the axial forces between the piston (2) and the mounting element (40) and minimizing the application of radial forces to the piston (2).

A catheter device having a proboscis, such as a needle, and a transducer which detects the axial displacement of the proboscis in relation to the distal tip of the catheter. The transducer is positioned at a distal portion of the catheter and may comprise an induction coil or a potentiometer. Axial displacement of the proboscis changes the amount of inductance or resistance in the transducer. This change in inductance or resistance can be calibrated to the amount of axial displacement of the proboscis and provided as feedback to the user.

A valve connector for medical infusion lines including an external tubular body with an inlet end and an outlet end, an internal hollow spike and an intermediate sealing member including a head with pre-slit and an elastic hollow element formed with fluid-tight members in contact with the hollow spike and with an elastic thrust means, which tends to maintain the elastic head in a closed condition. The elastic thrust means comprises a base part joined to the elastic hollow element of the sealing member through a generally transverse annular wall, which, during axial displacement of the elastic head from the closed condition to the open condition, bends within an annular chamber defined between the base part and a portion with conical surface of the hollow spike.

A controller for use with a guidewire, such as a vascular guidewire, provides a mechanism for gripping and applying a torque to the guidewire without the need to thread the guidewire axially through the controller and at a location close to a point of access of the guidewire. In one embodiment, the controller includes a side-access, multi-part assembly including a collett or other gripping element that applies a uniform radially inward force on the guidewire. In another embodiment, for use with guidewires having active electrically controllable elements, the controller integrally or removably incorporates a switch or other mechanism to initiate an energized state. The controller thereby permits, among other advantages, ergonomic, single-handed control of an electronically steerable guidewire, including axially displacing, torquing and steering the guidewire.

An injection device for injection of set doses of medicine from a cartridge has a nut (13) that is screwed up along a threaded piston rod (4) during a dose setting operation. The nut is screwed along the piston rod by rotating a dose setting member (17. A rotational coupling mechanism includes an axially displaceable coupling member (25) which is rotated as a function of axial displacement. During dose setting, the nut is allowed to rotate relative to the coupling member. During injection, the coupling member is rotationally locked to the nut. This provides a dose setting and injection mechanism wherein the nut member is both rotated during dose setting and during injection.

A low inductance contact probe comprises conductively coupled plungers. The plungers have coupling means which enable them to be slidably and non-rotatably engaged. A coil spring is attached to the plungers in a manner that prevents rotation of the spring's ends. The spring provides an axial plunger bias, and a torsional bias for conductive coupling between the plungers. The torsional bias is generated by an axial displacement of the spring and by twisting the spring a predetermined angle prior to attachment to the plungers. Torsion-induced contact forces between the plungers assure a direct conductive path through the plungers. The torsional bias further enables a positive attachment of the spring to the plungers. Plungers with hermaphroditic coupling means can be fabricated from a drawn profiled stock by stamping or machining. Essential plunger coupling features can be prefabricated in a drawn profiled stock with a high degree of dimensional accuracy and reproducibility.

A clearance sensing system for a rotating machine includes a plurality of sensor probes disposed within a stationary shroud of the rotating machine. Each of the plurality of sensor probes is adapted to measure a parameter indicative of an axial and a radial displacement of a rotating component within the shroud and to produce a signal that corresponds to the parameter. In certain embodiments, this parameter may include a capacitance between the rotating component and the sensor probe. The clearance sensing system further includes a circuit that receives the signal from each of the plurality of sensor probes and determines (a) the axial displacement of the rotating component within the shroud and (b) a radial displacement of the rotating component relative to the shroud.

The design comprises a shaft and sleeve supported for relative rotation by a journal type fluid dynamic bearing utilizing grooves on one of the shaft or sleeve surfaces. A grooved pattern of a design similar to that usually found on a thrust plate is defined on an axial end surface of the shaft or the counterplate facing the axial end of the shaft, so that thrust is created to maintain separation of the end of the shaft and the facing thrust plate during relative rotation.

In one embodiment, to establish and maintain the gap between the shaft end and the facing counterplate, the journal bearing has an asymmetry to pump toward the shaft end having the bearing. In a further refinement, to maintain the shaft and gap within an optimum spacing, a magnet is mounted to provide an axially directed magnetic force on the shaft which works against the axial force created by shaft end thrust bearing.

To prevent separation of the shaft and sleeve or hub, the hub which is integrated with a rotating shaft, further incorporates a shoulder which extends axially beneath a cooperating shoulder on the sleeve surrounding the shaft to prevent any more than a limited axially displacement of the hub and shaft relative to the sleeve.

A catheter is responsive to external and internal magnetic field generators for generating position data of the catheter position and pressure data to determine pressured exerted on a distal end of the catheter when engaged with tissue, with a reduced number of sensing coils and reduced number of sensing coil leads for minimizing lead breakage and failure. The catheter includes a distal section adapted for engagement with patient tissue, where the distal section has a proximal portion, a distal portion and a flexible joint with a resilient member adapted to allow axial displacement and angular deflection between the proximal and distal portions of the distal section.

The catheter may have three or less sensing coils with three or less leads, each transmitting signals between a respective sensing coil and the signal processor.

In order to simplify the insertion of the tool in the case of a coupling for a surgical rotary drive hand piece including a tool which is mounted in the hand piece and driven thereby in rotary manner and incorporating a sleeve-shaped, rotary driven seating in the hand piece into which a shank of the tool is adapted to be inserted so as to form an interlocking rotary drive means, and including at least one locking body which is adapted to be inserted radially into the interior of the seating and which, in an inserted locking position, engages in a recess in the shank and thereby secures it from axial displacement, whereas, in a radially withdrawn position, it leaves the recess and thus enables an axial displacement of the shank in the seating, it is proposed that a driver having at least one contact surface on the side thereof facing the tool and which rotates with the sleeve and is axially displaceable with respect thereto be arranged in the sleeve-shaped seating for the purposes of forming an interlocking rotary drive means, in that the driver is displaceable by the effect of a spring into a pushed-out position in which the locking body or bodies rest thereon and are thus held in their release position, in that the driver is displaceable by means of the shank of the tool resting thereon against the effect of the spring into a pushed-in position in which the locking body or bodies enter the locking position and can secure the shank of the tool from axial displacement, and in that the shank of the tool in the pushed-in position thereof secured from axial displacement by the locking body or bodies pushes the driver against the effect of the spring into the seating in such a manner that its contact surfaces rest against the contact surfaces of the tool so as to form a rotary drive means.

The invention discloses a flexible polishing mechanism for a blade profile abrasive belt. The flexible polishing mechanism is fixed on a numerical control machine through an installing frame. The flexible polishing mechanism drives a polishing wheel to act along the direction of a stationary shaft for controlling the polishing force; and a rolling wheel is arranged on a base plate for supporting the abrasive belt, a tensioning cylinder enables the abrasive belt to generate a pretightening force on the rolling wheel, a drive wheel drives the abrasive belt to rotate at high speed on the rolling wheel for controlling a cylinder in the flexible polishing mechanism so that the polishing wheel can make an axial displacement action, i.e. a cutter acts through flexibility in the polishing process, thus blade profile deformation and damage caused by rigid shock are avoided. The line deflection of the abrasive belt, generated in the polishing process, is regulated through a deviation correcting mechanism. The flexible polishing mechanism has the advantages of simple structure and convenience for operation, and realizes an automatic polishing process of the blade profile, thus the polishing quality of the blade profile is increased and the working efficiency is increased.

A downhole flow pulsing device comprises a housing connected in series with a drill string and a valve with a rotating portion in the housing arranged to vary an area of a flow passage through the housing. A fluid actuated positive displacement motor drives rotation of the valve. A drive link permits the rotating portion of the valve to be optionally coupled directly to the motor of the drill string. The valve includes radially oriented rotating ports intermittently communicating with surrounding fixed ports and a bypass channel. Axial displacement of the rotating ports relative to the fixed ports and bypass channel permits amplitude of the downstream fluid pulses to be adjusted. The valve includes a number of circumferentially spaced ports which differs from a prescribed number of pressure fluctuations in the fluid for each full rotation of the rotor of the drill motor.