306results about How to "Solve precise positioning" patented technology

An instrument for establishing orientation of a pelvic prosthesis comprises a tri-pod having an angularly adjustable guide rod on it. The tips of the legs define a plane, and the guide rod is set by the surgeon to a defined orientation with respect to this plane on the basis of preoperative studies. In use, two of the legs of the instrument are positioned by the surgeon at defined anatomical locations on the pelvis (e.g., a point in the region of the posterior/inferior acetabulum and a point on the anterior superior iliac spine). The third leg then lands on the pelvis at a point determined by the position of the first two points, as well as by the separations between the third leg and the other two legs. The separations are adjustable, but are preferably fixed percentages of the separation between the first and second legs. The position of the guide rod then defines with respect to the actual pelvis the direction for insertion of a prosthesis.

The invention concerns a device for adjusting the position of a screw (13) that is able to move a part of a surgical instrument, said device (4) comprising: —a stem (41) comprising a tip (42) suited to the head (130) of the screw (13), —an actuated system (45) for driving said stem (41) in rotation, —communication means to communicate with a control unit (21), such that the control unit (21) transmits to the actuated system (45) the number of turns to apply to the stem (41) to reach the target position of the screw (13). The invention also concerns a surgical system for alignment of surgical guide means (14, 15), comprising: —a positioning unit comprising a fixed part (11) and a mobile part (12) supporting the surgical guide means (14, 15), the position of said mobile part (12) being adjustable with respect to the fixed part (11) by screws (13), —a referencing unit for detecting the position of the positioning unit with respect to a target position of the surgical guide means, —a control unit (21) for computing the target position of screws (13), —said device (4) for adjusting the positions of the screws (13).

Dental drill device (10) comprises a drill (12) with a stop element (28). In various embodiments, at one end, the drill (12) has a cutting part (14) with a free drill end (16) and, at the other end, it has a shank part (18). Arranged on the shank part (18) there is a holder portion (26) with several fastening recesses (30) spaced apart from one another in the axial direction (A), each fastening recess (30) being limited, in the direction of an exposed receiving end area (20) of the shank part (18), by an abutment surface (34) which is at right angles to the axial direction (A) of the drill (12). A stop element with a drill abutment (36) is fitted onto the holder portion (26) and has an engagement element (58). The engagement element (58) has a counter-abutment surface (35) which cooperates in a form fit with the abutment surface (32). By means of the form fit acting between the abutment surface (32) and the counter-abutment surface (35), the stop element (28) is held on the drill (12) such that it cannot be displaced in the direction of the receiving end area (20) of the drill (12).

An examination platform for a magnetic resonance apparatus has a patient bed for supporting a patient, a local antenna device for acquisition of magnetic resonance signals, and a drive device arranged at the patient bed. The drive device is coupled with the local antenna device. The local antenna device thus can be moved parallel to the longitudinal axis of the patient bed independently of a movement of the patient bed. A magnetic resonance apparatus and a method for acquisition of image data of a patient employ such an examination platform.

The invention relates to a video analysis-based space positioning method. The method comprises the following steps: 1, obtaining and storing coordinate information, parameter information and relevant attribute information of a plurality of cameras in a range; 2, obtaining and storing video data containing a target; 3, searching the video data containing the target according to the characteristic information of the target; 4, obtaining and storing the coordinate information of the target at every moment in real time according to the information of the position of the target relative to the cameras, and the position coordinate information, the parameter information and relevant attribute information of the cameras; and 5, obtaining the motion locus of the target according to the coordinate information of the target at every moment. The method fully utilizes the dense monitoring facility laid in the city scene, can rapidly position the accurate position of the target, can obtain the motion locus of the monitored target within a period of time, solves the accurate positioning problem in the complex city scene, and avoids the position description complexity existing in simple latitude and longitude positioning.

A parallel kinematic machine (PKM) with three active kinematic chains and a leg has improved precision and stiffness maps by: providing drive and actuation of each active kinematic chain by devices secured rigidly to a support structure so that only a fixed length leg of the chain is suspended; driving the fixed length leg of the active kinematic chain to move in a direction oblique to a direction of the fixed length leg; and providing a prismatically jointed leg that is rigidly secured to the base structure and coupled by an effectively universal joint to the motion platform.

The invention discloses a high-precision electric field driven spray deposition 3D printer and a working method thereof, and solves the problems of a traditional 3D printer on multiple aspects of resolution, stability and controllability; high-precision printing of multilayer structures can be realized; the printing process is observed and monitored in real time; and high-precision pattern printing is performed on insulation substrates through electric conducting materials. The high-precision electric field driven spray deposition 3D printer comprises a mounting baseplate; a Y-axle worktable is arranged on the mounting baseplate; a vacuum absorption platform is fixed on the Y-axle worktable; a printing substrate is absorbed on the vacuum absorption platform; a printing nozzle and a vertical observation camera are correspondingly arranged above the printing substrate, and are connected to a Z-axle worktable; the Z-axle worktable is fixed on an X-axle worktable; a squint observation camera is correspondingly arranged on one side of the printing nozzle; an LED light source and a far infrared curing light source are correspondingly arranged on the other side of the printing nozzle; theprinting nozzle communicates with a storage bottle; and the storage bottle is arranged on a lifting table.

A hoist synchronization apparatus and method using a master controller operating software that provides a pulse reference to a slave controller. The slave commands its motor to rotate at the speed conveyed by that pulse reference. The slave controller monitors the pulse feedback from both the master encoder and the slave's encoder and compensates for any position error by adjusting its motor output speed. In addition, the slave controller includes the capability to automatically resynchronize the hoists. Resynchronization is accomplished by storing position error generated when either the master or the slave is run independently and correcting for the error when both units are operated at a later time.

The invention provides a city complex traffic environment path guide system and method based on locating labels. The method comprises the steps: (101) locating labels of two-dimension codes or classification codes and the like are arranged on the peripheries and vital lines of complex road junctions, interchanges, comprehensive transportation junctions and commercial building clusters; (102) the locating labels of the two-dimension codes or the classification codes and the like are linked to the physical positions of the locating labels arranged in realistic scenes; (103) the locating labels in the realistic scenes are scanned through a handheld or vehicle-mounted terminal, so that locating or path planning based on locating is achieved. The step (101) further comprises the step (101-1) for generating the locating labels; the step (101-2) for constructing a traffic network topology of a city complex environment by the adoption of a three-dimensional model capable of distinguishing nodes; and the step (101-3) of distributing different weighted values to different road sections, then obtaining an optimal edge dominating set based on the obtained network topology and the road section weighted values, and arranging the locating labels for the optimal edge dominating set.

Document feeder and image capturing device preventing empty stamping associated with improper positioning of printing unit. Document feeder A, conveying document originals from a document placement location, along a predetermined conveyance path (12), and to a document information-capturing location (5, 6), is furnished with: a printing unit (8), which is shiftable along the document widthwise direction approximately orthogonal to the document conveyance direction, and is for carrying out predetermined printing onto conveyed documents; and a detection unit (S4), provided in the conveyance path further upstream in the conveyance direction than the printer unit (8), that detects whether a conveyed document will pass inside the limits of the range in which the printer unit (8) prints.

The invention discloses a global positioning method of a laser-navigated AGV (automatic guided vehicle). The global positioning of the AGV comprises the determination of direction and position of the AGV in an environmental map. The method comprises the following steps: firstly, determining direction information by reading data of a compass arranged on an AGV body; and secondly, determining position information by using road sign information detected by a laser radar and by adopting a Markov method, wherein the Markov method comprises two stages, namely time updating and observation updating. According to the global positioning method, the problem of accurate positioning of the initial position of the AGV is effectively solved, so that the AGV is not required to start at a known position every time, furthermore, the great inconvenience brought to the application of the AGV is eliminated, namely even if the AGV starts at any position, a relatively accurate initial position of the AGV can be given.

If a supply voltage for a motor drops below a predetermined level during movement of a windowpane, a controller of a power window system outputs a stop signal instructing the motor to stop rotating, and stores in a memory a first position and a motion direction of the windowpane derived from a first signal generated by a transducer (signal generator). The controller compares a second position of the windowpane derived from a second signal generated by the transducer when the supply voltage for the motor is restored to the predetermined level or higher with the first position of the windowpane stored in the memory. If the second position is different from the first position, the first position stored in the memory is corrected toward the motion direction by an amount corresponding to a difference between the first and second positions

A computer arrangement is disclosed, including a processor and a memory that stores a computer program, object data originating from a first source and including object location data, and laser samples originating from a second source, including a sub-set of laser samples relating to the object and including laser sample location data as to each laser sample. In at least one embodiment, the processor compares the object location data and the laser sample location data of the sub-set of laser samples, and matches the object location data to the laser sample location data of the sub-set of laser samples based on this comparison, and thereby corrects for relative positional errors between the first and second sources of location data. The object may be a building façade, for example.

To control a speed at a time of entering a curved road a vehicle to autonomously travel within a travelling lane even in a case where there is an error in an estimated longitudinal position of the vehicle.

A curve travel speed calculation unit 15b calculates a curve travel speed for a vehicle to autonomously travelling in a travelling lane based on a curve radius and an estimated error in longitudinal position. A speed planning unit 15c and a travel control unit 17 decelerate the vehicle M such that the speed of the vehicle M becomes the curve travel speed at the time of entering the curved road in front of the vehicle M in a case where the speed of the vehicle M is equal to or higher than the curve travel speed and the curve travel speed is equal to or higher than the reference speed.