The apparatus is designed for the installation of front and rear crossed prosthetic ligaments in the articulation of the knee, and includes a stem which extends, at one end, with an arc-like tapered portion the end whereof is adapted to be inserted through the surgical opening at the knee, to pass between the tibial plate and the condyloid cavity and to be positioned in the exact outlet position of the bore to be provided, a small block having at least one hole for a screw for fastening to the b...

The present Invention relates to novel devices and methods to minimize the production of sand in subterranean environments; in particular, in poorly consolidated formations, sand is often co-produced along with the desired fluid (e.g., oil); sand production is undesirable, hence in the present Invention, elliptically shaped perforations of a particular orientation are created in the casing (or directly into the formation in the case of an uncased wellbore) that lines wellbore drilled through the...

The invention includes of a system and method of ultrasonically perforating adhesive bandage backings. The invention eliminates the gap between the ultrasonic horn and the pin roll, and provides for a wear resistant release coating on the pin roll. Further, the method and system disclose cooling the ultrasonic horn with a forced air stream, and provide for a pre- or post-nip roll to control the tension of the continuous web of backing. The web of backing is kept under tension with a nip roll, an...

A degradable ball sealer for use in the oil and gas industry is disclosed. The ball seat comprises a particular composition of matter and injection molding technique that provides a ball seal which will dissolve in stimulation or wellbore fluids after stimulation operations are complete. In use, the surface of the ball sealer softens slightly assuring a solid seal between the ball the and the casing perforation. The composition when dissolved into wellbore fluids does not pose a hazard and dispe...

For creating a hole in body tissue and then enlarging the hole, a guidewire has a continuous diameter guidewire body having a proximal end and a distal end, a distal portion including an electrically conductive exposed tip for creating a perforation when RF current is applied and for preventing the creation of a perforation when RF current is not applied. For expanding the hole, a dilator region is provided between the distal end of the guidewire body and the distal portion for expanding the hol...

In the perforation of sheet material including leather, artificial leather, foam, paper, filter paper, cardboard and foils by at least one group of spikes with perforating spikes, the individual pieces (9) of the sheet material are held on an endless conveyor device (2) and are pulled off the perforating spikes by a hold-down band (10a) which moves synchronously with the conveyor. It is especially advantageous that the at least one group of spikes is in each instance formed by a spike roller (7)...

A machine is provided for the creasing, perforation or circular cutting of a material in the form of sheets such as paper, plastic and the like. The machine includes a bed, a horizontal loading plane (11) that is intended to accommodate at least one stack of starting sheets, a feeding plane (13) as a continuation of the loading plane, an advancing suction roller (14) to pick up and transfer every single sheet from the bottom of the stack on the loading plane to the feeding plane, and a processin...

A method and apparatus for controlling the perforation of webs being moved in a longitudinal direction, by an array of electrodes spatially distributed in a transverse direction, wherein selected control electrodes are added to or removed from the electrode array to provide a transverse, or spatial, degree of control over web porosity. Synchronized sensing of multiple point transverse web porosity, combined with logic circuitry provides the controls for selection and actuation of the appropriate...

An apparatus and method for drilling an orifice in a human cranium at an angle of substantially 90.degree. to a plane defined by a tangent to the surface of the cranium at the orifice. The apparatus comprises a ring structure adapted to guide and support a drill, the ring structure comprising a retaining member configured for engagement with a flexible member such as a spring and a sleeve member configured for insertion within the retaining member and operatively associated therewith to form a s...

A technique to install a tool in a well includes running the tool into the well and fixing the tool to the well with a fixing agent without pumping the fixing agent through a central passageway of the tool. The tool may be a perforating gun that includes a casing body that includes a longitudinal axis. The perforating gun may also include a fin and a perforating charge. The fin radially extends from the casing body, and the perforating charge is attached to the fin and is oriented to generate a ...