45 results about "Screw extractor" patented technology

A tool for gripping and removing mechanical fasteners such as pedicle screws. With reference to FIG. 7, the device generally resembles a screwdriver, having a handle on one end, a long shaft in the middle, and fastener engaging means on the other end. The fastener engaging means comprises a set of two or more jaws having inward facing gripping surfaces positioned to grasp the external surfaces of a screw head. The jaws are formed as part of a collet slidably mounted within an outer thread sleeve. The thread sleeve is attached to the shaft. A tapered journal on the collet interacts with a tapered bore in the thread sleeve so that when the collet is pulled into the thread sleeve, the set of two or more jaws are squeezed together. The threaded engagements between the collet and the thread sleeve should be the reverse of the thread on the screw to be removed; i.e., if a right-hand screw is to be removed then the threaded engagement between the collet and the thread sleeve should be made with a left-hand thread. In operation, the jaws are placed over the screw head and the device is rotated in a counterclockwise direction (for removal of a screw with a right-hand thread). The inward facing surfaces on the jaws bear against the bolt head, thereby impeding the rotation of the collet relative to the thread sleeve. The left-hand threaded engagement between the collet and the thread sleeve therefore pulls the collet further into the thread sleeve, whereupon the tapered bore squeezes the jaws more tightly together. Thus, the reader will appreciate, applying torque to the device when it is in position on a screw head simultaneously torques the screw head and squeezes the jaws more tightly together. The inward facing surfaces are also provided with an undercut in order to accommodate axial misalignment between the jaws and the screw head.

The invention discloses a juice extractor and a spiral-extruded juicing screw thereof. An extrusion juicing part is formed at a spiral part of an outside surface of the spiral-extruded juicing screw;an upper part of the extrusion juicing part upwards extend in a spiral manner, and a holding cavity for enabling a rotary central axis of the screw to penetrate is formed between an inside surface andan inner wall of a filter module of the juice extractor; the food material with size exceeding the semi-diameter of the screw can be fed through the holding cavity, and the rotary central axis of thescrew is located in a horizontal projection plane of the holding cavity. The juice extractor is free from using a positioning shaft, a vertical size of the screw is reduced, then the volume of the juice extractor is reduced, and the material cost is reduced, so that the juice extractor is convenient to transport and store; and meanwhile, the top of the extrusion juicing part of the screw is eccentrically arranged, the rotary central axis is located at a discharge channel outlet and the horizontal projection plane of the holding cavity, the size of the holding cavity is increased so that the holding cavity can hold the food material with the size exceeding the semi-diameter of the filter module, and the juicing effect and the juicing efficiency are increased.

The invention relates to a screw juice extractor. The screw juice extractor comprises a screw (4) used for squeezing materials and a juice collecting cylinder (7) for accommodating the materials, and a sealing structure is arranged in a mutually matched position of the bottom surface of the screw (4) and the juice collecting cylinder (7) for preventing squeezed material residues from entering into an inner cavity of the screw (4) from the mutually matched position of the bottom surface of the screw (4) and the juice collecting cylinder (7). The screw juice extractor disclosed by the invention can prevent the squeezed material residues from entering into the inner cavity of the screw from the mutually matched position of the bottom surface of the screw and the juice collecting cylinder through the sealing structure, so that the residue discharging effect of the screw juice extractor can be optimized, and the juice yield is improved, furthermore, the material residues can be prevented from being accummulated in the inner cavity of the screw or flowing into the main machine body of the screw juice extractor to the greatest extent to reduce the cleaning workload of a user and optimize the experience effect of the user.

The invention discloses a screw extractor for an orthopedic surgery. The screw extractor comprises a screw extracting tube, holding tubes, a dilator, holding clamps, conical teeth, tooth clamp convex sections, arc-shaped chucks, a driver bar and a dilating ball joint, wherein the dilator is arranged in the screw extracting tube through limit threads in a screwing manner; the holding tubes are arranged at the outer part of the screw extracting tube through fastening threads; handles are arranged at the outer sides of the upper end of the screw extracting tube, and the limit threads are arranged at the inner side of the upper end of the screw extracting tube; a plurality of holding clamps and holding clamp grooves are arranged at and formed in the lower end of the screw extracting tube; the arc-shaped chucks and the conical teeth are arranged at the lower ends of the corresponding holding clamps; one tooth clamp convex section is arranged at the inner side of each holding clamp; the driver bar is arranged at the lower end of the dilator; the dilating ball joint is arranged in the middle of the dilator; the dilating ball joint is moved by the dilator through the limit threads; the dilating ball joint pushes away the tooth clamp convex sections and drives the holding clamps to dilate; a bone screw cap is clamped and fixed by the plurality of arc-shaped chucks. According to the screw extractor disclosed by the invention, the screw cap is fixed by the arc-shaped chucks and the conical teeth; screws can be quickly and conveniently taken out and are prevented from sliding out of the groove, so that pains of a patient are relieved, and the efficiency of the surgery is improved.