50 results about "Axial elongation" patented technology

A prosthesis for transluminal implantation consists of a flexible tubular interbraided structure of metal or polymeric monofilaments, and polymeric multifilament yarns. The prosthesis can be elastically deformed to reduce its diameter through axial elongation. The monofilaments and multifilament yarns are arranged in axially spaced apart helices, concentric on a common central axis of the prosthesis. The monofilaments are selectively shaped before their interbraiding with the multifilament yarns, either by an age-hardening or other heat-setting stage, or a cold-working stage that controllably plastically deforms the strands. The shaped structural strands cooperate to impart to the prosthesis its nominal shape and resilience. The textile strands cooperate to provide a sheeting that occupies interstices between adjacent structural strands, to reduce permeability and thereby enhance the utility of the prosthesis as a vascular graft. An alternative embodiment prosthesis includes elastically and plastically deformable structural strands, selectively plastically deformed by cold-working then interbraided to form the prosthesis.

A prosthesis for transluminal implantation consists of a flexible tubular three-dimensionally braided structure of metal or polymeric monofilaments, and polymeric multifilament yarns. The prosthesis can be elastically deformed to reduce its diameter through axial elongation. The monofilaments and multifilament yarns are arranged in axially spaced apart helices, concentric on a common central axis of the prosthesis. The monofilaments are selectively shaped before their interbraiding with the multifilament yarns, either by an age-hardening or other heat-setting stage, or a cold-working stage that controllably plastically deforms the strands. The shaped structural strands cooperate to impart to the prosthesis its nominal shape and resilience. The textile strands cooperate to provide one or more layers of sheeting that reduce permeability and thereby enhance the utility of the prosthesis as a vascular graft. An alternative embodiment prosthesis includes elastically and plastically deformable structural strands, selectively plastically deformed by cold working, then three-dimensionally braided to form the prosthesis.

Disclosed herein are elongate flexible medical devices which are capable of axial elongation through the mechanism of eversion or toposcopic expansion. In general, this may be accomplished by providing a flexible tubular device having a proximal end and a distal end. Retraction of the distal end in a proximal direction through the tubular body inverts the tube upon itself, causing an axial shortening of the overall length of the device. The original length of the device can be restored by coupling a pressurized media to the proximal end of the sleeve. If the distal end of the sleeve is temporarily restricted or closed, the pressurized media causes the distal end of the sleeve to travel distally until the full length of the sleeve has been restored.

Disclosed herein are elongate flexible medical devices which are capable of axial elongation through the mechanism of eversion or toposcopic expansion. In general, this may be accomplished by providing a flexible tubular device having a proximal end and a distal end. Retraction of the distal end in a proximal direction through the tubular body inverts the tube upon itself, causing an axial shortening of the overall length of the device. The original length of the device can be restored by coupling a pressurized media to the proximal end of the sleeve. If the distal end of the sleeve is temporarily restricted or closed, the pressurized media causes the distal end of the sleeve to travel distally until the full length of the sleeve has been restored.

A strip of material for the delivery of an oral care active is disclosed. The strip of material includes a structural elastic-like film backing layer including a strainable network having a first region and a second region formed of substantially the same material composition, the first region providing a first, elastic-like resistive force to an applied axial elongation, and the second region providing a second distinctive resistive force to further applied axial elongation, thereby providing at least two stages of resistive forces in use; and an oral care composition disposed on the film, the oral care composition including an oral care active.

The invention discloses a joint used for a robot limb and relates to a three-dimensional composite flexible joint which is characterized in that several groups of extended artificial muscles are arranged between an upper flange and a lower flange; a framework is arranged in a cavity formed by the several groups of extended artificial muscles; the extended artificial muscle is as follows: a spring is arranged between an upper end cover and a lower end cover, a capsule is arranged in a tubular cavity formed by the spring, and the lower end cover is provided with a fluid inlet; the framework is made of a tubular spring and also can be a component formed by a movable pair and a spherical pair in series; and two ends of the framework are fixed on the upper flange and the lower flange of the joint. The three-dimensional composite flexible joint has the advantages that the three-dimensional composite flexible joint has small size and good flexibility; a drive set of the joint is combined with the joint as a whole; the three-dimensional composite flexible joint can realize axial elongation and curvature of space, can realize the complex action of a bionic artificial joint, act stably and is fit for capturing or conveying objects with irregular shapes; and the three-dimensional composite flexible joint has popularization and application values in the field of bionic and specific robot and has very good market prospect.

The invention relates to a testing device and a testing method for high-temperature fatigue property of a microelement under a compound stress and belongs to the field of precise driving. Three built-in encapsulated piezoelectrically stacked multi-load piezoelectric drivers are in an equilateral triangle topological mounting form. The axial elongation movement under different time sequence voltages correspond to stretching-bending compound stressed forms in different modes of the to-be-tested microelement through transmission of motion of a spherical pair and a transmission pair, that is, three-degree-of-freedom high frequency alternating motion of one clamping end of a test piece is realized. The stretching piezoelectric drivers with regular groove structures can preload a uniaxial stretching load with relatively great motion displacement. In addition, a silicon nitride heating piece is embedded into a rectangular slot of a clamp body, so that a service temperature field with a controllable temperature gradient can be constructed. The testing device provided by the invention is compact in structure and rich in test content, and can be used for researching multi-stress fatigue failure behaviors of aero-engine materials and the like under a high-temperature service environment.

Articulation devices, systems, and methods for articulating elongate flexible structures can locally contract a flexible elongate frame or skeleton of an elongate flexible body such as a catheter. Balloons along one side of an axial segment of the elongate flexible body can be inflated so as to help define a resting shape of the elongate body. The skeleton may have pairs of corresponding axially oriented surface regions coupled to each other by a loop of a deformable helical coil structure. Balloons may be between the regions, and the pairs may be separated by an offset that increases when the axis of the skeleton is axially compressed. Inflation of the balloons can axially contract or shorten the skeleton adjacent the balloons so that the elongate body bends toward the balloons. Different sets of balloons may apply opposing local axial elongation and contraction forces so that selective inflation and deflation of subsets of the balloons can controllably bend and/or change an overall axial length of the elongate body throughout a workspace. Varying the inflation pressures of the opposed balloons can controllably and locally modulate the stiffness of the elongate body.

An improved tubular structure adapted to increase in diameter upon application of axial force is provided. Increase in diameter is achieved by constructing the tube from multiple layers of material that move relative to each other during axial elongation of the tube. The tube of the present invention can be used both to avoid problems in “necking” found in many prior tube devices, and to provide additional benefits that increases in diameter of the tube during axial elongation can provide. As such, the tube of the present invention may be useful as a manufacturing aid, as a deployment sheath (for example, to deliver medical devices), and in other applications that may benefit from easier tubular sheath removal.

The invention discloses a pneumatic multidirectional bending flexible joint which comprises constraint elements, a joint framework, air bags, an upper end cover, a lower end cover, upper sealing heads, lower sealing heads and fluid inlets. The constraint elements are arranged between the upper end cover and the lower end cover and are coaxially connected in series and densely arranged to form a columnar structure, a plurality of tubular cavities with parallel axes are formed in the columnar structure, the axis of one of the tubular cavities overlaps with the axis of the columnar structure to form a first tubular cavity, the tubular cavities expect the first tubular cavity are called as second tubular cavities, the air bags are arranged in the second tubular cavities, the two ends of the air bags are connected with the upper sealing heads and the lower sealing heads respectively and the lower sealing heads are provided with the fluid inlets. A driving device of the joint is combined with the joint to form an integral structure which is equivalent to four pneumatic artificial muscles in parallel connection and has one degree of freedom and two degrees of operation, and active bending, axial elongation and other functions of the joint in eight directions of space can be achieved.

The invention provides a rapid generation method of aircraft conduit processing files. The rapid generation method includes the steps of 1) extracting conduit PRB (axial elongation, rotation angle, bending angle) data; 2) adding process allowance; 3) calculating coordinates of key points of process information; 4) performing a process examination based on knowledge; 5) performing the simulation interfering; 6) generating the processing file. The rapid generation method has the advantages such as accurate recognition and high speed, can be applied to process program analysis and design and development of digital process system of the aircraft conduit and has a bright application prospect.

The invention discloses an actual measurement device and method of ultrahigh earth-rock dam internal 3D deformation. Multi-edged stainless steel plate is buried in some parts that need to be monitored in internal dam, and a vector line body is anchored in the center of the stainless steel plate. The downstream of the line body monitoring facility installs in a wedge-shaped sectional view room inserted in the downstream surface of the dam. A GNSS receiving antenna is installed in the roof and a two-axis inclinometer is installed in four corners of baseboard to acquire 6D shift of the house. The upper wall of the house is reserved for the wide seam for introducing the vector line body that tensions by a fixed pulley and a weight. The angle is measured by the line body orientation measurement device. The line body axial elongation is measured by coaxial swirling potentiometer type displacement meter in a fixed pulley and axial distribution temperature correction is considered. The internal dam 3D deformation can be gained by combining a sensor measurement value and a level-3 coordinate. The device and method has the advantages of high measurement accuracy, good stability and high reliability.

A prosthesis for implantation in a de-nucleated intervertebral disc includes a fiber ring-like layer which encloses a polymeric layer to create an annular space. The annular space is inflatable with an in-situ curable liquid polymer and forms an interior cavity. The annular space may be expanded uniformly or differentially to be tailored to the needs of a particular vertebral segment and to achieve optimal disc space width and angle, thereby stabilizing the segment while preserving normal motion of the vertebral segment. The interior cavity provides a void that allows inward deformation of the implant during weight bearing activities and bending. The prosthesis can be elastically deformed through axial elongation to a reduced profile to load into a delivery cannula using pulling techniques.

The present invention is a flexible ocular restraint band that includes a thin flexible material such as a surgical mesh fabric with flexible reinforced end portions. The device is positioned posterior to the eye globe and the reinforced ends are sutured to anterior portions of the scleral ring. Preferably, a side edge of the band is formed with a concave curved edge to be placed proximate the optical nerve without making contact or applying pressure to the optical nerve. When properly positioned the device prevents further axial elongation of the eye. In alternative embodiments the band may be formed as a generally linear strap, a three legged or “Y” shaped strap or a four legged “X” shaped strap.

The invention discloses a left aurcle plugging device adopting a staggered connection structure and an assembly method of the left aurcle plugging device. The left aurcle plugging device comprises a sealing part and an anchoring part which are connected with each other, each of the sealing part and the anchoring part is provided with a connecting part formed through shape convergence, and the connecting parts of the sealing part and the anchoring part extend opposite to each other and realize staggered fixing; and the anchoring part is formed through cutting, and the far-end side of the anchoring part is of a closed ring structure before release. For the left aurcle plugging device provided by the invention, the connecting method of the sealing part and the anchoring part is improved, so that the integral axial elongation of the left aurcle plugging device can be avoided and delayed, and further, the sealing part attaches to and plugs the left aurcle opening.

The invention discloses a liquid injection polishing method, which is characterized by the following: accelerating the abrading particle through high-pressure pump; spraying the abrading particle through nozzle on the workpiece surface to generate collision; polishing the workpiece surface; adapting the normal line of manufacturing domain center as axle to make nozzle and workpiece rotate relatively; letting the separation angle of nozzle pipe axle and tangent plane of manufacturing region center range from 30 to 90 deg and d as nozzle internal diameter. When the separation angle is 90 deg, the distance between intersection point of pipe axial elongation line and workpiece surface and manufacturing region center is from 0.5d to 1d; when the separation angle is less than 90 deg, the distance between intersection point of pipe axial elongation line and workpiece surface and manufacturing region center is from 0.2d to 1d. The invention can obtain ideal removal function to realize digital control polish, which is fit for optical manufacturing.

The invention discloses a method for calculating an axial swelling effect of a fast neutron reactor assembly. The method comprises the following steps of 1, separating a transport computation grid from a burnup computation grid, wherein the transport computation grid is kept unchanged in the whole computation, and the burnup computation grid keeps growth of a same proportion along with axial swelling of a fuel assembly; 2, based on a variational nodal method, establishing a weak form of a neutron transport equation solution, wherein a section in a node is a function related to a spatial position, so that appearance of various materials is allowed in a transport computation node; 3, expanding a flux by utilizing a spherical harmonic function and a spatial orthogonal polynomial, and solving a flux expansion moment by adopting a response matrix method so as to obtain flux distribution of each node; and 4, calculating a burnup level of the node according to average power of a burnup node, obtaining a homogenized section of the burnup node according to burnup interpolation, and adjusting the homogenized section in the burnup node according to axial elongation of the assembly to obtain a required homogenized section in the computation node.

The invention relates to a piezoelectrically-driven precision rotation driving device using a specially-shaped hinge transmission mechanism, and belongs to the technical field of precision engineering. The piezoelectrically-driven precision rotation driving device using the specially-shaped hinge transmission mechanism comprises a base, a rotating table surface, a stator assembly, a bearing and other units, wherein the base and the rotating table surface are connected through the bearing; the base and the stator assembly are connected through bolts; the rotating table surface and the stator assembly are in contact fit through front ends of driving feet; the base and the rotating table surface are in interference fit with the bearing. When an excitation electric signal acts on a piezoelectric stack, the piezoelectric stack generates axial elongation based on an inverse piezoelectric effect, the driving feet generate tangential displacement to drive the rotating table surface to generateprecise rotating motion, and by changing the direction and the time sequence of driving voltage, the rotating table surface can be controlled to generate positive and reverse rotating motions and positioning can be achieved. The piezoelectrically-driven precision rotation driving device using the specially-shaped hinge transmission mechanism has many technical advantages such as simple structure, high positioning precision and high response speed, and has a wide application prospect in the technical field of precision engineering.

The invention relates to the technical field of ophthalmic equipment, and discloses 650-nm light-supplementing glasses. The 650-nm light-supplementing glasses comprise a glasses box, wherein glasses supports are movably hinged with both the left and right sides of the glasses box, and red filter glass is embedded into the front surface of the glasses box. According to the 650-nm light-supplementing glasses, two 650-nm lasers are started through a control panel, at the time, laser beams of the 650-nm lasers travel towards diffuse reflectors, when the laser beams go through the red filter glass,filtered red light can treat eyes, when the 650-nm laser beams enter the eyes, part of laser energy irradiates eyeballs, 650-nm laser is at a hemoglobin spectrum absorption peak, and can be absorbedby hemoglobin, blood circulation is promoted, the oxygen supply capability of the eyeballs is improved, improvement of vision of the eyeballs is facilitated, under long-term treatment, axial elongation can be effectively inhibited, thus vision of the eyes is improved, and occurrence and development of shortsightedness are inhibited, so that the probability of shortsightedness is reduced.