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1901 results about "Circular segment" patented technology

In geometry, a circular segment (symbol: ⌓) is a region of a circle which is "cut off" from the rest of the circle by a secant or a chord. More formally, a circular segment is a region of two-dimensional space that is bounded by an arc (of less than 180°) of a circle and by the chord connecting the endpoints of the arc.

Methods for use in dental articulation

A computer implemented method of creating a dental model for use in dental articulation includes providing a first set of digital data corresponding to an upper arch image of at least a portion of an upper dental arch of a patient, providing a second set of digital data corresponding to a lower arch image of at least a portion of a lower dental arch of the patient, and providing hinge axis data representative of the spatial orientation of at least one of the upper and lower dental arches relative to a condylar axis of the patient. A reference hinge axis is created relative to the upper and lower arch images based on the hinge axis data. Further, the method may include bite alignment data for use in aligning the lower and upper arch images. Yet further, the method may include providing data associated with condyle geometry of the patient, so as to provide limitations on the movement of at least the lower arch image when the arch images are displayed. Further, a wobbling technique may be used to determine an occlusal position of the lower and upper dental arches. Various computer implemented methods of dental articulation are also described. For example, such dental articulation methods may include moving at least one of the upper and lower arch images to simulate relative movement of one of the upper and lower dental arches of the patient, may include displaying another image with the upper and lower dental arches of the dental articulation model, and/or may include playing back recorded motion of a patient's mandible using the dental articulation model.

Bone fastener and instrument for insertion thereof

A bone member fastener for closing a craniotomy includes a cap and a base interconnected by a narrow cylindrical collar. The cap has an externally threaded stud that screws into an internally threaded bore of the collar, thereby allowing the cap and base to be brought into clamping engagement against the internal and external faces of a bone plate and surrounding bone. In a particularly disclosed embodiment, the base of the fastener is placed below a craniotomy hole with the collar projecting into the hole, and the stud of the cap is screwed into the bore of the base from above the hole to clamp a bone flap against the surrounding cranium. This device provides a method of quickly and securely replacing a bone cover into a craniotomy. The distance between the cap and base can be selected by how far the threaded stud of the cap is advanced into the internally threaded collar. The fastener is therefore adaptable for use in several regions of the skull having various thicknesses. An insertion tool with a long handle permits safe and convenient placement of the base between the brain and the internal face of the bone plate. Some disclosed embodiments of the fastener have a cap and base that conform to the curved surface of the skull, for example by having an arcuate shape or flexible members that conform to the curvature of the bone plate and surrounding cranial bone as the fastener is tightened.

Systems and methods for spinal fixation

Featured are a method and apparatus for fixing adjacent vertebrate of a spine that avoids the need and associated problems with prior cage or straight rod and screw systems. Methods and apparatus of the invention utilize a new implant member, which preferably is arcuate. Preferred methods of the invention for stabilizing adjacent vertebrae of the spine, include steps of providing a positioning apparatus including two guide sleeves, each guide sleeve having a long axis and locating the two guide sleeves with respect to the adjacent vertebrae such that a vertex formed by the long axis of each guide sleeve is located in the intervertebral space for the adjacent vertebrae. The method further includes forming an aperture in each of the adjacent vertebrae using the guide sleeves and inserting an implant into the apertures formed in each of the adjacent vertebrae so that the implant extends between the adjacent vertebrae and through the intervertebral space. In an alternative method a cutting fixture including a pivot arm is secured to the adjacent vertebrae and a cutting device is secured to the pivot arm. The pivot arm and cutting device are configured and arranged so that rotation of the pivot arm about a particularly located pivot point allows the cutting device to form the aperture in each of the adjacent vertebrae. Another alternative method for fixing adjacent vertebrate of a spine includes the step of forming a common channel in and between the adjacent vertebrae and inserting a biscuit implant in the common so as to bridge between the adjacent vertebrae.

Methods of making bioprosthetic heart valves with strain matched leaflets

Heart valve leaflet selection methods and apparatuses which subject individual leaflets to loads and measure the resulting deflection to more reliably group leaflets of similar physical characteristics for later assembly in prosthetic heart valves. The deflection testing may be accomplished using a variety of test set ups which are designed to impart a load on the leaflet which simulates the actual loading within a heart valve. The results from a number of deflection tests are used to categorize individual leaflets, which data can be combined with other data regarding the characteristics of the leaflet to better select leaflets for assembly into a multi-leaflet heart valve. In one embodiment, the deflection test is combined with an intrinsic load test, and leaflets having similar deflection and intrinsic load values used in the same heart valve. One apparatus for testing the leaflets includes a frame for securing the arcuate cusp of the leaflet while the straight coapting edge remains free, to simulate the actual leaflet mounting configuration within the heart valve prosthesis. The frame may include a lower portion having a recess for the leaflet and plurality of receptor holes around the peripheral edge of the recess, and an upper portion having a plurality of needles which extend downward through the leaflet and into the receptor holes and secure the edges of the leaflet.

Suture passing instrument and method

ActiveUS20090138029A1Suture equipmentsDiagnosticsActuatorContinuous suture
In one embodiment, a continuous suture passer device may include a first jaw, a second jaw, a tissue penetrator which may penetrate through tissue positioned between the first and second jaws, and a suture shuttle which may be releasably secured to the tissue penetrator and adapted to carry a suture. Further, the device may include an actuator which may manipulate at least one of the first or second jaws and the tissue penetrator, and the second jaw may have a suture shuttle retainer seat on which the suture shuttle may be releasably secured. The tissue penetrator may be movable towards the second jaw such that the suture shuttle carried by the tissue penetrator may be transferred to the shuttle retainer seat on the second jaw. Additionally, the first and second jaws may be substantially parallel to one another at any position to which the at least one jaw is manipulated. Additionally, the tissue penetrator may travel along an arcuate path from a first position, recessed within the first jaw, to a second position where the tissue penetrator extends through the tissue to be positioned in communication with the second jaw. Further, the at least one jaw may be manipulated such that it travels along a path that is substantially the same arcuate path traveled by the tissue penetrator. A method for passing a suture through tissue includes manipulation to transfer a suture shuttle adapted to carry a suture between a tissue penetrator and a second jaw.
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