577results about How to "Improve rotational stability" patented technology

A polyaxial bone screw assembly includes a threaded shank body having an integral upper portion receivable in an integral receiver, the receiver having an upper channel for receiving a longitudinal connecting member and a lower cavity cooperating with a lower opening. A down-loadable compression insert with tool receiving arm extensions, a down-loadable friction fit split retaining ring and an up-loadable shank upper portion cooperate to provide for pop- or snap-on assembly of the shank with the receiver either prior to or after implantation of the shank into a vertebra. The shank and receiver once assembled cannot be disassembled.

A polyaxial bone screw assembly includes a threaded shank body having an integral upper portion receivable in an integral receiver, the receiver having an upper channel for receiving a longitudinal connecting member and a lower cavity cooperating with a lower opening. The receiver can have crimp tabs, but is devoid of spring tabs and collet-like flexible structures. A down-loadable compression insert (some with lock and release feature), a down-loadable friction fit split retaining ring having super structure for temporary friction fit with an up-loadable shank upper portion cooperate to provide for pop- or snap-on assembly of the shank with the receiver either prior to or after implantation of the shank into a vertebra. The shank and receiver once assembled cannot be disassembled.

The invention provides an oval ultrasonic machining device with a non-contact induction power supply function. The oval ultrasonic machining device is composed of an induction power supply device and an oval ultrasonic tool handle. The induction power supply vice sides of the induction power supply device are fixed to a BT tool handle shell of the oval ultrasonic tool handle. The induction power supply primary sides of the induction power supply device are arranged on the outer side of the oval ultrasonic tool handle and are arranged in an internal-external concentric circle mode. The gap between the two induction power supply primary sides is kept small. The induction power supply primary sides are fixed to a spindle seat of a numerical control machining center machine tool through a bracket and kept static. The oval ultrasonic tool handle is fixed a spindle of the numerical control machining center spindle through a taper shank and rotates at a high speed along with the spindle. By adoption of the oval ultrasonic machining device, the rotary radius of the oval ultrasonic tool handle is decreased, the rotary inertia of the oval ultrasonic tool handle is lowered, rotary stability of the oval ultrasonic tool handle is improved, and the oval ultrasonic machining device can avoid the working space of a tool replacing manipulator and meet the automatic tool replacing condition under the condition that the structure of the spindle of the numerical control machining machine tool is not changed. The structure is simple, and operation and use are convenient.

A bone-anchored surgical mesh has slot-like anchoring members that allow for the variable placement of screws and other bone fasteners. This permits the surgeon discretion in the placement of bone fasteners used to attach the mesh to the patient's bone. The elongate openings of the anchoring members allow for a sliding motion between the bone fasteners and the anchoring members, and facilitates positioning and articulation of the mesh. The anchoring members may include bushings to aid the sliding motion of the anchoring member on the bone fastener. In one embodiment, the mesh consists of shorter modular strips that overlap each other such that a single bone fastener is passed through two overlapping anchoring members to lock the two modular mesh strips together. Additional modular mesh strips can be added on at either end, as desired, to provide the desired length of dural coverage.

A cutting block for resecting a bone, particularly the distal femur, has a body with a first generally planar bone contacting surface to contact the resected distal surface of the femur. The body has a second surface spaced from the bone contacting surface along an axis perpendicular to said generally planar bone contacting surface. The body has a perimeter surface extending between the first and second surfaces, wherein the perimeter surface is at least partially curved with respect to the axis in both a direction generally perpendicular thereto and generally parallel thereto. The perimeter surface may be polished.

An impeller includes a hub and at least one blade. In this case, the hub has at least one balancing portion disposed on hub and arranged with respect to a center of the hub. The balancing portion has at least one corner. The blades are disposed around the hub. In addition, a fan including the impeller is also provided. The impeller and the fan can enhance the rotation stability. As a result, the product reliability and lifetime can be increased. Furthermore, the impeller and the fan facilitate the balancing object to be separated from the tool at the corner.

This invention is related to contact lenses. In particular, the present invention is related to a toric contact lens design with thickness zones in the carrier portion of the lens for increased rotational stability.

An axial tube assembly for a motor includes an axial tube and a sleeve mounted in the axial tube. The axial tube is securely mounted to a casing, and a stator is mounted to the axial tube. The axial tube includes at least one engaging member on an inner periphery thereof. The sleeve includes at least one engaging member engaged with the engaging member of the axial tube. When a bearing is mounted in the sleeve, the sleeve is tightly engaged with the axial tube such that the axial tube and the bearing exert forces to each other to thereby retain the axial tube and the bearing in place.