922 results about "Serration" patented technology

A surgical instrument comprising a handle assembly, a body, a tool assembly and an articulation assembly is disclosed. The articulation mechanism includes a receptacle, and a main shaft. A lower clutch is fixedly positioned within the receptacle and has a serrated portion including a plurality of serrations. An upper clutch includes at least one projection positioned to engage the serrations of the lower clutch to releasably retain the main shaft at a rotatably fixed position. An angle between a first pair of adjacent serrations is defined as a first angle, an angle between a second pair of adjacent serrations is defined as a second angle, and an angle between a third pair of adjacent serrations is defined as a third angle. The first angle, the second angle, and the third angle are each different from one another.

A medical device for clamping the stomach in morbid obesity surgery consists of a silicone frame that is essentially U-shaped, having opposing legs self-hinged to a bight portion interconnecting the legs. The opposing legs have sufficient stiffness to permit limited bending and have inner surfaces that sealingly carry an inflatable balloon which can be selectively inflated or aspirated after the device has been clamped to the stomach to adjust the gastric restriction stoma. A flexible latch member carried by one of the legs has at least one serration which is inserted into a latch cavity of the opposing leg to lock the opposing legs in fixed spaced relationship. Lumens within the legs communicate with a fluid supply source and respective inflatable balloon for selective inflation or aspiration of the inflatable balloons.

Pedicle and non-pedicle based interspinous and lateral spacers have an upper surface configured for engagement with an inferior surface of a fifth lumbar vertebral body, and a lower surface configured for engagement with an outer surface of a sacrum. One configuration includes a component having two opposing upper arms and two opposing lower arms. The spacer component has two ends and a central section, each end of the spacer component being configured for attachment to a respective one of the two opposing upper arms, and the central section of the spacer has a height configured for placement between a spinous process of a fifth lumbar vertebral body and a superior surface of an uppermost spinous process of a sacrum. The ends of the spacer component may be attached to the upper arms using pedicle screws, or may use snap-and-lock or other connectors. The two lower arms may either engage directly with the outer surface of a sacrum on either side of a medial ridge, or may interconnect with a separate component also having two lower arms that engage with the outer surface of a sacrum on either side of a medial ridge. Such arms are preferably bent outwardly and include inward serrations to engage with the outer surface of a sacrum on either side of a medial ridge. Other configurations include a spacer component that engages with a sacral notch.

A device and method for intravascular treatment of atherosclerotic plaque perforates the plaque with microperforations by small sharp spikes to act as serrations for forming cleavage lines or planes in the plaque. In preferred embodiments, expansion may be obtained by mechanical apparatus, expansion balloon, or balloon-assisted deployment. The plaque treatment enables a subsequent balloon angioplasty to be performed without creating substantial dissections and at low balloon pressure so as to avoid injury to the arterial wall. The plaque treatment may include dilatation of the plaque at low pressure, sufficiently that no subsequent balloon angioplasty is needed. The plaque preparation may be followed by applying one or a few ring tacks to secure the compressed plaque with minimal emplacement of foreign material.

A wellhead seal assembly that forms a metal-to-metal seal between inner and outer wellhead members. A metal seal ring has inner and outer walls separated by a slot. The exterior surfaces of the outer and inner walls contain a soft metal inlay. A wicker profile with a slick area is located on the outer surface of the inner wellhead member and on the inner surface of the outer wellhead member. An energizing ring is moved into the slot to force the outer and inner walls of the seal into sealing engagement with the inner and outer wellhead members. The soft metal inlays deform onto the slick area on the wellhead members. The wickers on the wellhead members embed into the walls of the seal ring.

In a saw blade for power tools, in particular for power reciprocating saws, with a blade back (11) and a toothing (12) extending along the lower edge of the blade back and comprising many saw teeth (13) lined up in succession, in order to increase the blade life and service life of the saw blade, especially in a thick, stable embodiment, the saw teeth (13) in successive portions (a, b) of the toothing (12) are embodied with the same tooth width (az, bz), which however differs from that of the saw teeth (13) in the preceding or the succeeding portion (b, a) of the toothing (12).

An impeller for generating an air flow, for use in a device such as a blower / vacuum, the impeller having a hub structure for mounting the impeller on a rotatable shaft of the blower / vac and a plurality of air-flow generating vanes coupled to the hub structure in a non-uniform manner wherein the spacing between adjacent vanes is irregular. An impeller having non-uniform spacing between adjacent vanes is provided. Additional features of the impeller may include a plurality of debris engaging structures or serrations for facilitating a finer mulch of air-entrained debris.

An impeller for generating an air flow, for use in a device such as a blower / vacuum, the impeller having a hub structure for mounting the impeller on a rotatable shaft of the blower / vac and a plurality of air-flow generating vanes coupled to the hub structure in a non-uniform manner wherein the spacing between adjacent vanes is irregular. An impeller having non-uniform spacing between adjacent vanes is provided by the present invention. Additional features of the impeller may include a plurality of debris engaging structures or serrations for facilitating a finer mulch of air-entrained debris.

The present invention provides an improved endodontic instrument. The instrument can be constructed of a ribbon of material such as any material that has a suitable edge for cutting and can be twisted or bent into any desired shape. The ribbon can be made of a metal, a polymeric film or combinations thereof. The ribbon can have a straight edge or a serrated one. The instrument is in the shape of a cone, tapering towards one end. It has a hollow interior and cutting edges disposed in a helical pattern along its length. The instrument can perform various or all of the functions of any endodontic instrument used in the root canal procedure.

This invention is directed to an apparatus and method for producing microparticles comprising pharmacologically active agents and biodegradable polymers. The apparatus includes a spinning disk containing a reservoir in the center thereof and a flat inclined surface. The apparatus optionally includes serrations and / or a flat surface beneath the periphery of the disk that is parallel to the rotational axis of the disk. The invention is also directed to a method for producing microparticles containing pharmacologically active agents, using the spinning disk apparatus. Formulations containing ophthalmically active agents are provided. Formulations exhibiting zero order release rates are also described.

A cutting insert has four quadrants defined by vertical and horizontal axes that pass through a centerline axis of the insert. The cutting insert further includes a top surface; a bottom surface; a plurality of clearance side surfaces extending between the top and bottom surfaces. A cutting edge is formed at an intersection between the top surface and the clearance side surfaces. A serration is formed in each clearance side surface such that two of the four quadrants that are diagonally opposite each other do not have serrations, and the other two of the four quadrants that are diagonally opposite each other include a pair of serrations. The cutting insert can be mounted to a milling cutter in a variety of patterns by rotating one cutting insert relative to another cutting insert in the same flute or in a different flute.

A ratcheting fastener assembly is operable to be secured to an object and includes a rotatable threaded fastener and a ratchet element. The rotatable threaded fastener includes a serrated ratchet head and a threaded fastener body extending axially from the ratchet head. The ratchet element is in ratcheting engagement with the head and includes an annular element frame and at least one tooth operable to engage the object to restrict element rotation. The ratchet element also includes a plurality of circumferentially spaced pawls. The pawls and corresponding serrations rotatably ratchet relative to each other when the fastener is rotated in a tightening direction and engage each other when the head is rotated in a loosening direction.

An improved cutter blade or disc mower blade is provided having structure to reduce the tendency of vegetation to slip off and around the blade edge and tip. The disc mower blade is attached to a rotary cutter module and driven by a mowing machine. In one aspect of the disc mower blade, the disc mower blade includes a knife edge with serrations distributed along the edge such that vegetation does not slide along the edge during operation of the mowing machine. Further, another aspect of the mower blade is that the knife edge may be curved so as to prevent the vegetation from sliding along the edge during operation of the mowing machine. In another aspect, the disc mower blade includes a winglet disposed at a tip of the blade such that vegetation cannot slide past the blade during operation of the mowing machine.