142results about How to "Avoid unwinding" patented technology

A filter arrangement includes a filter element configured for straight through flow and a handle member secured to the filter element. The filter element may typically have a plurality of flutes where selected ones of the flutes are open at upstream portions and closed at downstream portions, and where selected ones of the flutes are closed at the upstream portions and open at the downstream portions. In one embodiment, the handle member is secured to the central core member. In some embodiments, the handle member and the central core member are a single molded construction. The handle member can include a single aperture, such as an elongated slot, or a plurality of apertures. A method for servicing a system having a straight through flow filter element includes grasping a handle secured to the filter element, and pulling the handle to remove the filter element from the system.

An angled tissue cutting instrument comprises an angled outer tubular member rotatably receiving a flexible inner tubular member. The inner member has a flexible region in correspondence with an angle of the outer member. The flexible region comprises a helically cut length portion of an elongate tubular body of the inner member and a continuous solid flexible surface secured to an outer surface of the body along the helically cut length portion. A method of fabricating a flexible inner tubular member involves forming a helical cut through the solid wall of a length portion of a tubular body and securing a continuous solid flexible surface to the outer surface of the body along the helically cut length portion to form a flexible region.

A rotational atherectomy device for removing a stenotic tissue from a vessel of a patient is disclosed. The device comprises a rotatable, flexible, hollow drive shaft having a fluid impermeable wall defining a fluid impermeable lumen of the drive shaft and, an abrasive element mounted to a distal end portion of the drive shaft proximal to and spaced away from a distal support element formed at a distal end of the drive shaft, the distal support element being inflatable by pressurized fluid which flows in an antegrade direction through said lumen of the drive shaft and is at least partially re-directed into the distal fluid inflatable support element. The distal fluid inflatable support element has an outer wall comprising an outflow opening located such that said outflow opening faces an inner surface of a treated vessel during rotation of the drive shaft so that a flow of fluid through said outflow opening forms a layer of fluid between the outer wall of the rotating fluid inflated distal support element and a wall of the treated vessel to form a fluid bearing between the outer wall of the rotating fluid inflated distal support element and the wall of the treated vessel, the drive shaft being comprised of at least one fluid impermeable membrane and at least two torque transmitting coils, one of said coils extending distally beyond the distal end of the other coil and conveying torque to the abrasive element mounted to the drive shaft distal to and spaced away from a portion of the drive shaft formed from the fluid impermeable membrane and said torque transmitting coils.

Described herein are methods and apparatus for approximating targeted tissue by intertwining two or more sutures together. The sutures are attached to the targeted tissue and routed to a twister device. The twister device secures end portions of the sutures and twists them to intertwine the sutures. Controlling the number of twists provides control over the forces applied to the targeted tissue. In conjunction with visualization feedback, real-time adjustments can be made to achieved targeted results, such as elimination of mitral regurgitation when the disclosed methods and apparatus are applied to mitral valve repair.

An apparatus to assist tightening of cargo straps used on flat-bed vehicles comprises a gearbox having a worm gear and matching wheel gear to tighten the strap. The output of the gearbox is coupled to a tie-down strap. The apparatus enables a user to quickly and properly tighten a tie-down strap regardless of the user's physical size and strength. The apparatus can be provided at each tie-down strap or be moved from strap location to strap location as desired.

An electric cord utilizing flat strip metal under tension to simplify rewinding the cord. The apparatus comprises a spring biased metal clad within a non-conducting sheath. The spring-loaded metal is biased to effect a concave surface in the general axis congruent to the extreme or long axis. The preloaded spring metal coils in its natural state. The embodiment of the invention locates multiple strips of spring metal in a parallel configuration. The apparatus confines the linear metal strips within a plastic or alternate non-conductor sheath configured to bend or distort the apparatus parallel to the long axis. The apparatus can then be distorted along the major axis to counteract the spring tension delaying the natural coiling of the electric cord. In a basic embodiment the distortion is applied by folding the electric cord along the major axis producing a ridged configuration and resisting the spring from coiling. Reversing the distortion by unfolding the electric cord recreates the spring tension and promotes the self-coiling action.

The invention relates to a thermal annealing acid-washing method of a stainless steel wide and thick plate coil, which comprises the following steps of: uncoiling an inlet of the stainless steel wide and thick plate coil, welding, continuously annealing, breaking scales shot-blasting, acid-washing, flattening, and coiling an outlet of the stainless steel wide and thick plate coil, wherein the groove depth of a welding girder is 1.0-1.5mm; 3-6 annealing furnaces with the total length of 75-150m are adopted in continuous annealing, the annealing temperature is 1000-1150 DEG C, and the annealing time is 10-20min; in the shot blasting process, the blasting speed is 1500-2250rpm, the blasting quantity is 600-100kg/min, and the blasting particle has a grain size of 0.5-0.7mm; and in the acid washing step, acid washing is carried out by adopting mixed acid of hydrofluoric acid and nitric acid in 3-6 sections of grooves. By adopting the method, in a continuous annealing acid-washing process of the stainless steel wide and thick plate coil, problems of strip breakage, poor material property, poor surface quality, reeling off, surface scratching and the like can be avoided as much as possible.

A device for adjusting the tension of the strings of a guitar having at least two strings, particularly an electric guitar or a bass, particularly an electric bass, in which each string of the guitar or bass is, with one end, wound on a turning peg of an adjusting mechanism mounted on the neck of the guitar or of the bass. The adjusting mechanism contains a combination consisting of a worm shaft and of a worm wheel and, due to these, is provided with a self-locking ability. The aim of the invention is to improve the design of a device of the aforementioned type so that, without considerably altering the basic shape of the guitar or of the bass, this device can automatically adjust the tension of individual strings of the instrument reliably and precisely whereby ultimately enabling them to be tuned. To this end, a drive unit for each adjusting mechanism is mounted on the neck of the guitar or of the bass. The drive unit is directly connected to the worm shaft or to the worm wheel (17) of this adjusting mechanism in order to drive the worm shaft or the worm wheel.

The invention relates to a unit for synchronous extension and retraction of two wire segments that are wound onto a storage spool in such a way that upon a rotary motion of the storage spool in one rotation direction, both wire segments are synchronously unwound, and upon a rotary motion of the storage spool in the other rotation direction they are synchronously rewound, the wire segments being separated from one another and being fastened at their storage-spool ends to the storage spool, the storage spool comprising a catch that is effective in that rotation direction in which the wire segments are unwound from the storage spool, and is releasable via an actuation device. The invention furthermore relates to a motor vehicle using such a unit.

The invention discloses an input saturation spacecraft unwinding-free attitude tracking control method. The input saturation spacecraft unwinding-free attitude tracking control method includes the steps: calculating the error attitude according to a given command attitude and a practical attitude, then designing a control law according to a backstepping method, including designing a virtual control law and designing a feedback control law by using nonlinear damping, and finally using an extended state observer to estimate the lumped disturbance item in real time so as to obtain an attitude tracking control quantity u; and controlling the spacecraft by means of the control quantity u. The spacecraft system controlled by the input saturation spacecraft unwinding-free attitude tracking control method can track the command attitude with high precision under the condition that the moment of inertia is unknown, and the external disturbance exists, and the input is saturated. Compared with atraditional input saturation attitude control method, the input saturation spacecraft unwinding-free attitude tracking control method has anti-interference and strong robustness, and provides an effective scheme for engineering implementation of attitude tracking control.

The invention provides an uncoiler. The uncoiler comprises a frame body, an uncoiling device and a material feeding device. The frame body comprises an under frame and a vertical frame. The vertical frame is arranged on the under frame. The vertical frame and the under frame are arranged in a vertical mode. The material feeding device comprises a material pressing mechanism, a first material feeding mechanism and a second material feeding mechanism. The material pressing mechanism and the first material feeding mechanism are arranged on the two sides of the uncoiling device respectively. The second material feeding mechanism is arranged below the material pressing mechanism. The uncoiler has the advantages and the positive effects that due to the structure, the material feeding of the uncoiler is stable, and the drooping problem during the sheet material feeding procedure is solved.